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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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This touches three areas of code, removes unused variables and discards return values from two functions with (void). https://bugzilla.gnome.org/show_bug.cgi?id=645267
1578 lines
38 KiB
C
1578 lines
38 KiB
C
/* GStreamer
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* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) 2004 Wim Taymans <wim.taymans@gmail.com>
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* Copyright (C) 2007 Peter Kjellerstedt <pkj@axis.com>
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* Copyright (C) 2008 Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>
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*
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* gstpoll.c: File descriptor set
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstpoll
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* @short_description: Keep track of file descriptors and make it possible
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* to wait on them in a cancelable way
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*
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* A #GstPoll keeps track of file descriptors much like fd_set (used with
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* select()) or a struct pollfd array (used with poll()). Once created with
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* gst_poll_new(), the set can be used to wait for file descriptors to be
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* readable and/or writeable. It is possible to make this wait be controlled
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* by specifying %TRUE for the @controllable flag when creating the set (or
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* later calling gst_poll_set_controllable()).
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*
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* New file descriptors are added to the set using gst_poll_add_fd(), and
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* removed using gst_poll_remove_fd(). Controlling which file descriptors
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* should be waited for to become readable and/or writeable are done using
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* gst_poll_fd_ctl_read() and gst_poll_fd_ctl_write().
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*
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* Use gst_poll_wait() to wait for the file descriptors to actually become
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* readable and/or writeable, or to timeout if no file descriptor is available
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* in time. The wait can be controlled by calling gst_poll_restart() and
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* gst_poll_set_flushing().
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*
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* Once the file descriptor set has been waited for, one can use
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* gst_poll_fd_has_closed() to see if the file descriptor has been closed,
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* gst_poll_fd_has_error() to see if it has generated an error,
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* gst_poll_fd_can_read() to see if it is possible to read from the file
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* descriptor, and gst_poll_fd_can_write() to see if it is possible to
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* write to it.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gst_private.h"
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#include <sys/types.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <glib.h>
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#ifdef G_OS_WIN32
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#include <winsock2.h>
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#define EINPROGRESS WSAEINPROGRESS
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#else
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#define _GNU_SOURCE 1
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#include <sys/poll.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#endif
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/* OS/X needs this because of bad headers */
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#include <string.h>
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/* The poll() emulation on OS/X doesn't handle fds=NULL, nfds=0,
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* so we prefer our own poll emulation.
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*/
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#if defined(BROKEN_POLL)
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#undef HAVE_POLL
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#endif
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#include "gstpoll.h"
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#define GST_CAT_DEFAULT GST_CAT_POLL
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#ifdef G_OS_WIN32
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typedef struct _WinsockFd WinsockFd;
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struct _WinsockFd
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{
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gint fd;
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glong event_mask;
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WSANETWORKEVENTS events;
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glong ignored_event_mask;
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};
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#endif
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typedef enum
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{
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GST_POLL_MODE_AUTO,
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GST_POLL_MODE_SELECT,
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GST_POLL_MODE_PSELECT,
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GST_POLL_MODE_POLL,
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GST_POLL_MODE_PPOLL,
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GST_POLL_MODE_WINDOWS
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} GstPollMode;
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struct _GstPoll
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{
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GstPollMode mode;
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GMutex *lock;
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/* array of fds, always written to and read from with lock */
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GArray *fds;
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/* array of active fds, only written to from the waiting thread with the
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* lock and read from with the lock or without the lock from the waiting
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* thread */
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GArray *active_fds;
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#ifndef G_OS_WIN32
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gchar buf[1];
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GstPollFD control_read_fd;
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GstPollFD control_write_fd;
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#else
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GArray *active_fds_ignored;
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GArray *events;
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GArray *active_events;
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HANDLE wakeup_event;
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#endif
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gboolean controllable;
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volatile gint waiting;
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volatile gint control_pending;
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volatile gint flushing;
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gboolean timer;
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volatile gint rebuild;
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};
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static gboolean gst_poll_fd_ctl_read_unlocked (GstPoll * set, GstPollFD * fd,
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gboolean active);
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static gboolean gst_poll_add_fd_unlocked (GstPoll * set, GstPollFD * fd);
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#define IS_FLUSHING(s) (g_atomic_int_get(&(s)->flushing))
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#define SET_FLUSHING(s,val) (g_atomic_int_set(&(s)->flushing, (val)))
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#define INC_WAITING(s) (g_atomic_int_exchange_and_add(&(s)->waiting, 1))
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#define DEC_WAITING(s) (g_atomic_int_exchange_and_add(&(s)->waiting, -1))
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#define GET_WAITING(s) (g_atomic_int_get(&(s)->waiting))
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#define TEST_REBUILD(s) (g_atomic_int_compare_and_exchange(&(s)->rebuild, 1, 0))
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#define MARK_REBUILD(s) (g_atomic_int_set(&(s)->rebuild, 1))
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#ifndef G_OS_WIN32
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#define WAKE_EVENT(s) (write ((s)->control_write_fd.fd, "W", 1) == 1)
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#define RELEASE_EVENT(s) (read ((s)->control_read_fd.fd, (s)->buf, 1) == 1)
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#else
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#define WAKE_EVENT(s) (SetEvent ((s)->wakeup_event))
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#define RELEASE_EVENT(s) (ResetEvent ((s)->wakeup_event))
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#endif
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/* the poll/select call is also performed on a control socket, that way
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* we can send special commands to control it */
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static inline gboolean
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raise_wakeup (GstPoll * set)
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{
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gboolean result = TRUE;
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if (g_atomic_int_exchange_and_add (&set->control_pending, 1) == 0) {
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/* raise when nothing pending */
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result = WAKE_EVENT (set);
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}
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return result;
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}
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/* note how bad things can happen when the 2 threads both raise and release the
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* wakeup. This is however not a problem because you must always pair a raise
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* with a release */
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static inline gboolean
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release_wakeup (GstPoll * set)
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{
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gboolean result = TRUE;
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if (g_atomic_int_dec_and_test (&set->control_pending)) {
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result = RELEASE_EVENT (set);
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}
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return result;
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}
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static inline gint
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release_all_wakeup (GstPoll * set)
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{
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gint old;
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while (TRUE) {
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if (!(old = g_atomic_int_get (&set->control_pending)))
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/* nothing pending, just exit */
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break;
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/* try to remove all pending control messages */
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if (g_atomic_int_compare_and_exchange (&set->control_pending, old, 0)) {
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/* we managed to remove all messages, read the control socket */
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(void) RELEASE_EVENT (set);
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break;
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}
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}
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return old;
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}
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static gint
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find_index (GArray * array, GstPollFD * fd)
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{
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#ifndef G_OS_WIN32
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struct pollfd *ifd;
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#else
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WinsockFd *ifd;
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#endif
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guint i;
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/* start by assuming the index found in the fd is still valid */
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if (fd->idx >= 0 && fd->idx < array->len) {
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#ifndef G_OS_WIN32
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ifd = &g_array_index (array, struct pollfd, fd->idx);
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#else
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ifd = &g_array_index (array, WinsockFd, fd->idx);
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#endif
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if (ifd->fd == fd->fd) {
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return fd->idx;
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}
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}
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/* the pollfd array has changed and we need to lookup the fd again */
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for (i = 0; i < array->len; i++) {
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#ifndef G_OS_WIN32
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ifd = &g_array_index (array, struct pollfd, i);
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#else
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ifd = &g_array_index (array, WinsockFd, i);
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#endif
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if (ifd->fd == fd->fd) {
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fd->idx = (gint) i;
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return fd->idx;
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}
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}
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fd->idx = -1;
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return fd->idx;
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}
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#if !defined(HAVE_PPOLL) && defined(HAVE_POLL)
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/* check if all file descriptors will fit in an fd_set */
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static gboolean
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selectable_fds (const GstPoll * set)
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{
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guint i;
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g_mutex_lock (set->lock);
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for (i = 0; i < set->fds->len; i++) {
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struct pollfd *pfd = &g_array_index (set->fds, struct pollfd, i);
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if (pfd->fd >= FD_SETSIZE)
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goto too_many;
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}
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g_mutex_unlock (set->lock);
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return TRUE;
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too_many:
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{
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g_mutex_unlock (set->lock);
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return FALSE;
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}
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}
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/* check if the timeout will convert to a timeout value used for poll()
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* without a loss of precision
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*/
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static gboolean
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pollable_timeout (GstClockTime timeout)
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{
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if (timeout == GST_CLOCK_TIME_NONE)
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return TRUE;
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/* not a nice multiple of milliseconds */
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if (timeout % 1000000)
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return FALSE;
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return TRUE;
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}
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#endif
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static GstPollMode
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choose_mode (const GstPoll * set, GstClockTime timeout)
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{
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GstPollMode mode;
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if (set->mode == GST_POLL_MODE_AUTO) {
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#ifdef HAVE_PPOLL
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mode = GST_POLL_MODE_PPOLL;
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#elif defined(HAVE_POLL)
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if (!selectable_fds (set) || pollable_timeout (timeout)) {
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mode = GST_POLL_MODE_POLL;
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} else {
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#ifdef HAVE_PSELECT
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mode = GST_POLL_MODE_PSELECT;
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#else
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mode = GST_POLL_MODE_SELECT;
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#endif
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}
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#elif defined(HAVE_PSELECT)
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mode = GST_POLL_MODE_PSELECT;
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#else
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mode = GST_POLL_MODE_SELECT;
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#endif
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} else {
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mode = set->mode;
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}
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return mode;
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}
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#ifndef G_OS_WIN32
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static gint
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pollfd_to_fd_set (GstPoll * set, fd_set * readfds, fd_set * writefds,
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fd_set * errorfds)
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{
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gint max_fd = -1;
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guint i;
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FD_ZERO (readfds);
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FD_ZERO (writefds);
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FD_ZERO (errorfds);
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g_mutex_lock (set->lock);
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for (i = 0; i < set->active_fds->len; i++) {
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struct pollfd *pfd = &g_array_index (set->fds, struct pollfd, i);
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if (pfd->fd < FD_SETSIZE) {
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if (pfd->events & POLLIN)
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FD_SET (pfd->fd, readfds);
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if (pfd->events & POLLOUT)
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FD_SET (pfd->fd, writefds);
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if (pfd->events)
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FD_SET (pfd->fd, errorfds);
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if (pfd->fd > max_fd && (pfd->events & (POLLIN | POLLOUT)))
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max_fd = pfd->fd;
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}
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}
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g_mutex_unlock (set->lock);
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return max_fd;
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}
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static void
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fd_set_to_pollfd (GstPoll * set, fd_set * readfds, fd_set * writefds,
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fd_set * errorfds)
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{
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guint i;
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g_mutex_lock (set->lock);
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for (i = 0; i < set->active_fds->len; i++) {
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struct pollfd *pfd = &g_array_index (set->active_fds, struct pollfd, i);
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if (pfd->fd < FD_SETSIZE) {
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pfd->revents = 0;
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if (FD_ISSET (pfd->fd, readfds))
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pfd->revents |= POLLIN;
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if (FD_ISSET (pfd->fd, writefds))
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pfd->revents |= POLLOUT;
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if (FD_ISSET (pfd->fd, errorfds))
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pfd->revents |= POLLERR;
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}
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}
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g_mutex_unlock (set->lock);
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}
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#else /* G_OS_WIN32 */
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/*
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* Translate errors thrown by the Winsock API used by GstPoll:
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* WSAEventSelect, WSAWaitForMultipleEvents and WSAEnumNetworkEvents
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*/
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static gint
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gst_poll_winsock_error_to_errno (DWORD last_error)
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{
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switch (last_error) {
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case WSA_INVALID_HANDLE:
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case WSAEINVAL:
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case WSAENOTSOCK:
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return EBADF;
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case WSA_NOT_ENOUGH_MEMORY:
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return ENOMEM;
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/*
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* Anything else, including:
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* WSA_INVALID_PARAMETER, WSAEFAULT, WSAEINPROGRESS, WSAENETDOWN,
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* WSANOTINITIALISED
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*/
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default:
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return EINVAL;
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}
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}
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static void
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gst_poll_free_winsock_event (GstPoll * set, gint idx)
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{
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WinsockFd *wfd = &g_array_index (set->fds, WinsockFd, idx);
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HANDLE event = g_array_index (set->events, HANDLE, idx);
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WSAEventSelect (wfd->fd, event, 0);
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CloseHandle (event);
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}
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static void
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gst_poll_update_winsock_event_mask (GstPoll * set, gint idx, glong flags,
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gboolean active)
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{
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WinsockFd *wfd;
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wfd = &g_array_index (set->fds, WinsockFd, idx);
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if (active)
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wfd->event_mask |= flags;
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else
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wfd->event_mask &= ~flags;
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/* reset ignored state if the new mask doesn't overlap at all */
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if ((wfd->ignored_event_mask & wfd->event_mask) == 0)
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wfd->ignored_event_mask = 0;
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}
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static gboolean
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gst_poll_prepare_winsock_active_sets (GstPoll * set)
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{
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guint i;
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g_array_set_size (set->active_fds, 0);
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g_array_set_size (set->active_fds_ignored, 0);
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g_array_set_size (set->active_events, 0);
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g_array_append_val (set->active_events, set->wakeup_event);
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for (i = 0; i < set->fds->len; i++) {
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WinsockFd *wfd = &g_array_index (set->fds, WinsockFd, i);
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HANDLE event = g_array_index (set->events, HANDLE, i);
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if (wfd->ignored_event_mask == 0) {
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gint ret;
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g_array_append_val (set->active_fds, *wfd);
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g_array_append_val (set->active_events, event);
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ret = WSAEventSelect (wfd->fd, event, wfd->event_mask);
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if (G_UNLIKELY (ret != 0)) {
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errno = gst_poll_winsock_error_to_errno (WSAGetLastError ());
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return FALSE;
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}
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} else {
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g_array_append_val (set->active_fds_ignored, wfd);
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}
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}
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|
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return TRUE;
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}
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|
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static gint
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gst_poll_collect_winsock_events (GstPoll * set)
|
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{
|
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gint res, i;
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/*
|
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* We need to check which events are signaled, and call
|
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* WSAEnumNetworkEvents for those that are, which resets
|
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* the event and clears the internal network event records.
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*/
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res = 0;
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for (i = 0; i < set->active_fds->len; i++) {
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WinsockFd *wfd = &g_array_index (set->active_fds, WinsockFd, i);
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HANDLE event = g_array_index (set->active_events, HANDLE, i + 1);
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DWORD wait_ret;
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wait_ret = WaitForSingleObject (event, 0);
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if (wait_ret == WAIT_OBJECT_0) {
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gint enum_ret = WSAEnumNetworkEvents (wfd->fd, event, &wfd->events);
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|
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if (G_UNLIKELY (enum_ret != 0)) {
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res = -1;
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errno = gst_poll_winsock_error_to_errno (WSAGetLastError ());
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break;
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}
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res++;
|
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} else {
|
|
/* clear any previously stored result */
|
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memset (&wfd->events, 0, sizeof (wfd->events));
|
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}
|
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}
|
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|
|
/* If all went well we also need to reset the ignored fds. */
|
|
if (res >= 0) {
|
|
res += set->active_fds_ignored->len;
|
|
|
|
for (i = 0; i < set->active_fds_ignored->len; i++) {
|
|
WinsockFd *wfd = g_array_index (set->active_fds_ignored, WinsockFd *, i);
|
|
|
|
wfd->ignored_event_mask = 0;
|
|
}
|
|
|
|
g_array_set_size (set->active_fds_ignored, 0);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* gst_poll_new:
|
|
* @controllable: whether it should be possible to control a wait.
|
|
*
|
|
* Create a new file descriptor set. If @controllable, it
|
|
* is possible to restart or flush a call to gst_poll_wait() with
|
|
* gst_poll_restart() and gst_poll_set_flushing() respectively.
|
|
*
|
|
* Free-function: gst_poll_free
|
|
*
|
|
* Returns: (transfer full): a new #GstPoll, or %NULL in case of an error.
|
|
* Free with gst_poll_free().
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
GstPoll *
|
|
gst_poll_new (gboolean controllable)
|
|
{
|
|
GstPoll *nset;
|
|
|
|
GST_DEBUG ("controllable : %d", controllable);
|
|
|
|
nset = g_slice_new0 (GstPoll);
|
|
nset->lock = g_mutex_new ();
|
|
#ifndef G_OS_WIN32
|
|
nset->mode = GST_POLL_MODE_AUTO;
|
|
nset->fds = g_array_new (FALSE, FALSE, sizeof (struct pollfd));
|
|
nset->active_fds = g_array_new (FALSE, FALSE, sizeof (struct pollfd));
|
|
nset->control_read_fd.fd = -1;
|
|
nset->control_write_fd.fd = -1;
|
|
{
|
|
gint control_sock[2];
|
|
|
|
if (socketpair (PF_UNIX, SOCK_STREAM, 0, control_sock) < 0)
|
|
goto no_socket_pair;
|
|
|
|
fcntl (control_sock[0], F_SETFL, O_NONBLOCK);
|
|
fcntl (control_sock[1], F_SETFL, O_NONBLOCK);
|
|
|
|
nset->control_read_fd.fd = control_sock[0];
|
|
nset->control_write_fd.fd = control_sock[1];
|
|
|
|
gst_poll_add_fd_unlocked (nset, &nset->control_read_fd);
|
|
gst_poll_fd_ctl_read_unlocked (nset, &nset->control_read_fd, TRUE);
|
|
}
|
|
#else
|
|
nset->mode = GST_POLL_MODE_WINDOWS;
|
|
nset->fds = g_array_new (FALSE, FALSE, sizeof (WinsockFd));
|
|
nset->active_fds = g_array_new (FALSE, FALSE, sizeof (WinsockFd));
|
|
nset->active_fds_ignored = g_array_new (FALSE, FALSE, sizeof (WinsockFd *));
|
|
nset->events = g_array_new (FALSE, FALSE, sizeof (HANDLE));
|
|
nset->active_events = g_array_new (FALSE, FALSE, sizeof (HANDLE));
|
|
|
|
nset->wakeup_event = CreateEvent (NULL, TRUE, FALSE, NULL);
|
|
#endif
|
|
|
|
/* ensure (re)build, though already sneakily set in non-windows case */
|
|
MARK_REBUILD (nset);
|
|
|
|
nset->controllable = controllable;
|
|
|
|
return nset;
|
|
|
|
/* ERRORS */
|
|
#ifndef G_OS_WIN32
|
|
no_socket_pair:
|
|
{
|
|
GST_WARNING ("%p: can't create socket pair !", nset);
|
|
gst_poll_free (nset);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* gst_poll_new_timer:
|
|
*
|
|
* Create a new poll object that can be used for scheduling cancellable
|
|
* timeouts.
|
|
*
|
|
* A timeout is performed with gst_poll_wait(). Multiple timeouts can be
|
|
* performed from different threads.
|
|
*
|
|
* Free-function: gst_poll_free
|
|
*
|
|
* Returns: (transfer full): a new #GstPoll, or %NULL in case of an error.
|
|
* Free with gst_poll_free().
|
|
*
|
|
* Since: 0.10.23
|
|
*/
|
|
GstPoll *
|
|
gst_poll_new_timer (void)
|
|
{
|
|
GstPoll *poll;
|
|
|
|
/* make a new controllable poll set */
|
|
if (!(poll = gst_poll_new (TRUE)))
|
|
goto done;
|
|
|
|
/* we are a timer */
|
|
poll->timer = TRUE;
|
|
|
|
done:
|
|
return poll;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_free:
|
|
* @set: (transfer full): a file descriptor set.
|
|
*
|
|
* Free a file descriptor set.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
void
|
|
gst_poll_free (GstPoll * set)
|
|
{
|
|
g_return_if_fail (set != NULL);
|
|
|
|
GST_DEBUG ("%p: freeing", set);
|
|
|
|
#ifndef G_OS_WIN32
|
|
if (set->control_write_fd.fd >= 0)
|
|
close (set->control_write_fd.fd);
|
|
if (set->control_read_fd.fd >= 0)
|
|
close (set->control_read_fd.fd);
|
|
#else
|
|
CloseHandle (set->wakeup_event);
|
|
|
|
{
|
|
guint i;
|
|
|
|
for (i = 0; i < set->events->len; i++)
|
|
gst_poll_free_winsock_event (set, i);
|
|
}
|
|
|
|
g_array_free (set->active_events, TRUE);
|
|
g_array_free (set->events, TRUE);
|
|
g_array_free (set->active_fds_ignored, TRUE);
|
|
#endif
|
|
|
|
g_array_free (set->active_fds, TRUE);
|
|
g_array_free (set->fds, TRUE);
|
|
g_mutex_free (set->lock);
|
|
g_slice_free (GstPoll, set);
|
|
}
|
|
|
|
/**
|
|
* gst_poll_get_read_gpollfd:
|
|
* @set: a #GstPoll
|
|
* @fd: a #GPollFD
|
|
*
|
|
* Get a GPollFD for the reading part of the control socket. This is useful when
|
|
* integrating with a GSource and GMainLoop.
|
|
*
|
|
* Since: 0.10.32
|
|
*/
|
|
void
|
|
gst_poll_get_read_gpollfd (GstPoll * set, GPollFD * fd)
|
|
{
|
|
g_return_if_fail (set != NULL);
|
|
g_return_if_fail (fd != NULL);
|
|
|
|
#ifndef G_OS_WIN32
|
|
fd->fd = set->control_read_fd.fd;
|
|
#else
|
|
#if GLIB_SIZEOF_VOID_P == 8
|
|
fd->fd = (gint64) set->wakeup_event;
|
|
#else
|
|
fd->fd = (gint) set->wakeup_event;
|
|
#endif
|
|
#endif
|
|
fd->events = G_IO_IN | G_IO_HUP | G_IO_ERR;
|
|
fd->revents = 0;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_fd_init:
|
|
* @fd: a #GstPollFD
|
|
*
|
|
* Initializes @fd. Alternatively you can initialize it with
|
|
* #GST_POLL_FD_INIT.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
void
|
|
gst_poll_fd_init (GstPollFD * fd)
|
|
{
|
|
g_return_if_fail (fd != NULL);
|
|
|
|
fd->fd = -1;
|
|
fd->idx = -1;
|
|
}
|
|
|
|
static gboolean
|
|
gst_poll_add_fd_unlocked (GstPoll * set, GstPollFD * fd)
|
|
{
|
|
gint idx;
|
|
|
|
GST_DEBUG ("%p: fd (fd:%d, idx:%d)", set, fd->fd, fd->idx);
|
|
|
|
idx = find_index (set->fds, fd);
|
|
if (idx < 0) {
|
|
#ifndef G_OS_WIN32
|
|
struct pollfd nfd;
|
|
|
|
nfd.fd = fd->fd;
|
|
nfd.events = POLLERR | POLLNVAL | POLLHUP;
|
|
nfd.revents = 0;
|
|
|
|
g_array_append_val (set->fds, nfd);
|
|
|
|
fd->idx = set->fds->len - 1;
|
|
#else
|
|
WinsockFd wfd;
|
|
HANDLE event;
|
|
|
|
wfd.fd = fd->fd;
|
|
wfd.event_mask = FD_CLOSE;
|
|
memset (&wfd.events, 0, sizeof (wfd.events));
|
|
wfd.ignored_event_mask = 0;
|
|
event = WSACreateEvent ();
|
|
|
|
g_array_append_val (set->fds, wfd);
|
|
g_array_append_val (set->events, event);
|
|
|
|
fd->idx = set->fds->len - 1;
|
|
#endif
|
|
MARK_REBUILD (set);
|
|
} else {
|
|
GST_WARNING ("%p: couldn't find fd !", set);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_add_fd:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
*
|
|
* Add a file descriptor to the file descriptor set.
|
|
*
|
|
* Returns: %TRUE if the file descriptor was successfully added to the set.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_add_fd (GstPoll * set, GstPollFD * fd)
|
|
{
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (fd != NULL, FALSE);
|
|
g_return_val_if_fail (fd->fd >= 0, FALSE);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
ret = gst_poll_add_fd_unlocked (set, fd);
|
|
|
|
g_mutex_unlock (set->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_remove_fd:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
*
|
|
* Remove a file descriptor from the file descriptor set.
|
|
*
|
|
* Returns: %TRUE if the file descriptor was successfully removed from the set.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_remove_fd (GstPoll * set, GstPollFD * fd)
|
|
{
|
|
gint idx;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (fd != NULL, FALSE);
|
|
g_return_val_if_fail (fd->fd >= 0, FALSE);
|
|
|
|
|
|
GST_DEBUG ("%p: fd (fd:%d, idx:%d)", set, fd->fd, fd->idx);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
/* get the index, -1 is an fd that is not added */
|
|
idx = find_index (set->fds, fd);
|
|
if (idx >= 0) {
|
|
#ifdef G_OS_WIN32
|
|
gst_poll_free_winsock_event (set, idx);
|
|
g_array_remove_index_fast (set->events, idx);
|
|
#endif
|
|
|
|
/* remove the fd at index, we use _remove_index_fast, which copies the last
|
|
* element of the array to the freed index */
|
|
g_array_remove_index_fast (set->fds, idx);
|
|
|
|
/* mark fd as removed by setting the index to -1 */
|
|
fd->idx = -1;
|
|
MARK_REBUILD (set);
|
|
} else {
|
|
GST_WARNING ("%p: couldn't find fd !", set);
|
|
}
|
|
|
|
g_mutex_unlock (set->lock);
|
|
|
|
return idx >= 0;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_fd_ctl_write:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
* @active: a new status.
|
|
*
|
|
* Control whether the descriptor @fd in @set will be monitored for
|
|
* writability.
|
|
*
|
|
* Returns: %TRUE if the descriptor was successfully updated.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_fd_ctl_write (GstPoll * set, GstPollFD * fd, gboolean active)
|
|
{
|
|
gint idx;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (fd != NULL, FALSE);
|
|
g_return_val_if_fail (fd->fd >= 0, FALSE);
|
|
|
|
GST_DEBUG ("%p: fd (fd:%d, idx:%d), active : %d", set,
|
|
fd->fd, fd->idx, active);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
idx = find_index (set->fds, fd);
|
|
if (idx >= 0) {
|
|
#ifndef G_OS_WIN32
|
|
struct pollfd *pfd = &g_array_index (set->fds, struct pollfd, idx);
|
|
|
|
if (active)
|
|
pfd->events |= POLLOUT;
|
|
else
|
|
pfd->events &= ~POLLOUT;
|
|
|
|
GST_LOG ("pfd->events now %d (POLLOUT:%d)", pfd->events, POLLOUT);
|
|
#else
|
|
gst_poll_update_winsock_event_mask (set, idx, FD_WRITE | FD_CONNECT,
|
|
active);
|
|
#endif
|
|
MARK_REBUILD (set);
|
|
} else {
|
|
GST_WARNING ("%p: couldn't find fd !", set);
|
|
}
|
|
|
|
g_mutex_unlock (set->lock);
|
|
|
|
return idx >= 0;
|
|
}
|
|
|
|
static gboolean
|
|
gst_poll_fd_ctl_read_unlocked (GstPoll * set, GstPollFD * fd, gboolean active)
|
|
{
|
|
gint idx;
|
|
|
|
GST_DEBUG ("%p: fd (fd:%d, idx:%d), active : %d", set,
|
|
fd->fd, fd->idx, active);
|
|
|
|
idx = find_index (set->fds, fd);
|
|
|
|
if (idx >= 0) {
|
|
#ifndef G_OS_WIN32
|
|
struct pollfd *pfd = &g_array_index (set->fds, struct pollfd, idx);
|
|
|
|
if (active)
|
|
pfd->events |= (POLLIN | POLLPRI);
|
|
else
|
|
pfd->events &= ~(POLLIN | POLLPRI);
|
|
#else
|
|
gst_poll_update_winsock_event_mask (set, idx, FD_READ | FD_ACCEPT, active);
|
|
#endif
|
|
MARK_REBUILD (set);
|
|
} else {
|
|
GST_WARNING ("%p: couldn't find fd !", set);
|
|
}
|
|
|
|
return idx >= 0;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_fd_ctl_read:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
* @active: a new status.
|
|
*
|
|
* Control whether the descriptor @fd in @set will be monitored for
|
|
* readability.
|
|
*
|
|
* Returns: %TRUE if the descriptor was successfully updated.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_fd_ctl_read (GstPoll * set, GstPollFD * fd, gboolean active)
|
|
{
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (fd != NULL, FALSE);
|
|
g_return_val_if_fail (fd->fd >= 0, FALSE);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
ret = gst_poll_fd_ctl_read_unlocked (set, fd, active);
|
|
|
|
g_mutex_unlock (set->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_fd_ignored:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
*
|
|
* Mark @fd as ignored so that the next call to gst_poll_wait() will yield
|
|
* the same result for @fd as last time. This function must be called if no
|
|
* operation (read/write/recv/send/etc.) will be performed on @fd before
|
|
* the next call to gst_poll_wait().
|
|
*
|
|
* The reason why this is needed is because the underlying implementation
|
|
* might not allow querying the fd more than once between calls to one of
|
|
* the re-enabling operations.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
void
|
|
gst_poll_fd_ignored (GstPoll * set, GstPollFD * fd)
|
|
{
|
|
#ifdef G_OS_WIN32
|
|
gint idx;
|
|
|
|
g_return_if_fail (set != NULL);
|
|
g_return_if_fail (fd != NULL);
|
|
g_return_if_fail (fd->fd >= 0);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
idx = find_index (set->fds, fd);
|
|
if (idx >= 0) {
|
|
WinsockFd *wfd = &g_array_index (set->fds, WinsockFd, idx);
|
|
|
|
wfd->ignored_event_mask = wfd->event_mask & (FD_READ | FD_WRITE);
|
|
MARK_REBUILD (set);
|
|
}
|
|
|
|
g_mutex_unlock (set->lock);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* gst_poll_fd_has_closed:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
*
|
|
* Check if @fd in @set has closed the connection.
|
|
*
|
|
* Returns: %TRUE if the connection was closed.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_fd_has_closed (const GstPoll * set, GstPollFD * fd)
|
|
{
|
|
gboolean res = FALSE;
|
|
gint idx;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (fd != NULL, FALSE);
|
|
g_return_val_if_fail (fd->fd >= 0, FALSE);
|
|
|
|
GST_DEBUG ("%p: fd (fd:%d, idx:%d)", set, fd->fd, fd->idx);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
idx = find_index (set->active_fds, fd);
|
|
if (idx >= 0) {
|
|
#ifndef G_OS_WIN32
|
|
struct pollfd *pfd = &g_array_index (set->active_fds, struct pollfd, idx);
|
|
|
|
res = (pfd->revents & POLLHUP) != 0;
|
|
#else
|
|
WinsockFd *wfd = &g_array_index (set->active_fds, WinsockFd, idx);
|
|
|
|
res = (wfd->events.lNetworkEvents & FD_CLOSE) != 0;
|
|
#endif
|
|
} else {
|
|
GST_WARNING ("%p: couldn't find fd !", set);
|
|
}
|
|
|
|
g_mutex_unlock (set->lock);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_fd_has_error:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
*
|
|
* Check if @fd in @set has an error.
|
|
*
|
|
* Returns: %TRUE if the descriptor has an error.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_fd_has_error (const GstPoll * set, GstPollFD * fd)
|
|
{
|
|
gboolean res = FALSE;
|
|
gint idx;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (fd != NULL, FALSE);
|
|
g_return_val_if_fail (fd->fd >= 0, FALSE);
|
|
|
|
GST_DEBUG ("%p: fd (fd:%d, idx:%d)", set, fd->fd, fd->idx);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
idx = find_index (set->active_fds, fd);
|
|
if (idx >= 0) {
|
|
#ifndef G_OS_WIN32
|
|
struct pollfd *pfd = &g_array_index (set->active_fds, struct pollfd, idx);
|
|
|
|
res = (pfd->revents & (POLLERR | POLLNVAL)) != 0;
|
|
#else
|
|
WinsockFd *wfd = &g_array_index (set->active_fds, WinsockFd, idx);
|
|
|
|
res = (wfd->events.iErrorCode[FD_CLOSE_BIT] != 0) ||
|
|
(wfd->events.iErrorCode[FD_READ_BIT] != 0) ||
|
|
(wfd->events.iErrorCode[FD_WRITE_BIT] != 0) ||
|
|
(wfd->events.iErrorCode[FD_ACCEPT_BIT] != 0) ||
|
|
(wfd->events.iErrorCode[FD_CONNECT_BIT] != 0);
|
|
#endif
|
|
} else {
|
|
GST_WARNING ("%p: couldn't find fd !", set);
|
|
}
|
|
|
|
g_mutex_unlock (set->lock);
|
|
|
|
return res;
|
|
}
|
|
|
|
static gboolean
|
|
gst_poll_fd_can_read_unlocked (const GstPoll * set, GstPollFD * fd)
|
|
{
|
|
gboolean res = FALSE;
|
|
gint idx;
|
|
|
|
GST_DEBUG ("%p: fd (fd:%d, idx:%d)", set, fd->fd, fd->idx);
|
|
|
|
idx = find_index (set->active_fds, fd);
|
|
if (idx >= 0) {
|
|
#ifndef G_OS_WIN32
|
|
struct pollfd *pfd = &g_array_index (set->active_fds, struct pollfd, idx);
|
|
|
|
res = (pfd->revents & (POLLIN | POLLPRI)) != 0;
|
|
#else
|
|
WinsockFd *wfd = &g_array_index (set->active_fds, WinsockFd, idx);
|
|
|
|
res = (wfd->events.lNetworkEvents & (FD_READ | FD_ACCEPT)) != 0;
|
|
#endif
|
|
} else {
|
|
GST_WARNING ("%p: couldn't find fd !", set);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_fd_can_read:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
*
|
|
* Check if @fd in @set has data to be read.
|
|
*
|
|
* Returns: %TRUE if the descriptor has data to be read.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_fd_can_read (const GstPoll * set, GstPollFD * fd)
|
|
{
|
|
gboolean res = FALSE;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (fd != NULL, FALSE);
|
|
g_return_val_if_fail (fd->fd >= 0, FALSE);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
res = gst_poll_fd_can_read_unlocked (set, fd);
|
|
|
|
g_mutex_unlock (set->lock);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_fd_can_write:
|
|
* @set: a file descriptor set.
|
|
* @fd: a file descriptor.
|
|
*
|
|
* Check if @fd in @set can be used for writing.
|
|
*
|
|
* Returns: %TRUE if the descriptor can be used for writing.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_fd_can_write (const GstPoll * set, GstPollFD * fd)
|
|
{
|
|
gboolean res = FALSE;
|
|
gint idx;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (fd != NULL, FALSE);
|
|
g_return_val_if_fail (fd->fd >= 0, FALSE);
|
|
|
|
GST_DEBUG ("%p: fd (fd:%d, idx:%d)", set, fd->fd, fd->idx);
|
|
|
|
g_mutex_lock (set->lock);
|
|
|
|
idx = find_index (set->active_fds, fd);
|
|
if (idx >= 0) {
|
|
#ifndef G_OS_WIN32
|
|
struct pollfd *pfd = &g_array_index (set->active_fds, struct pollfd, idx);
|
|
|
|
res = (pfd->revents & POLLOUT) != 0;
|
|
#else
|
|
WinsockFd *wfd = &g_array_index (set->active_fds, WinsockFd, idx);
|
|
|
|
res = (wfd->events.lNetworkEvents & FD_WRITE) != 0;
|
|
#endif
|
|
} else {
|
|
GST_WARNING ("%p: couldn't find fd !", set);
|
|
}
|
|
|
|
g_mutex_unlock (set->lock);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_wait:
|
|
* @set: a #GstPoll.
|
|
* @timeout: a timeout in nanoseconds.
|
|
*
|
|
* Wait for activity on the file descriptors in @set. This function waits up to
|
|
* the specified @timeout. A timeout of #GST_CLOCK_TIME_NONE waits forever.
|
|
*
|
|
* For #GstPoll objects created with gst_poll_new(), this function can only be
|
|
* called from a single thread at a time. If called from multiple threads,
|
|
* -1 will be returned with errno set to EPERM.
|
|
*
|
|
* This is not true for timer #GstPoll objects created with
|
|
* gst_poll_new_timer(), where it is allowed to have multiple threads waiting
|
|
* simultaneously.
|
|
*
|
|
* Returns: The number of #GstPollFD in @set that have activity or 0 when no
|
|
* activity was detected after @timeout. If an error occurs, -1 is returned
|
|
* and errno is set.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gint
|
|
gst_poll_wait (GstPoll * set, GstClockTime timeout)
|
|
{
|
|
gboolean restarting;
|
|
gboolean is_timer;
|
|
int res;
|
|
gint old_waiting;
|
|
|
|
g_return_val_if_fail (set != NULL, -1);
|
|
|
|
GST_DEBUG ("timeout :%" GST_TIME_FORMAT, GST_TIME_ARGS (timeout));
|
|
|
|
is_timer = set->timer;
|
|
|
|
/* add one more waiter */
|
|
old_waiting = INC_WAITING (set);
|
|
|
|
/* we cannot wait from multiple threads unless we are a timer */
|
|
if (G_UNLIKELY (old_waiting > 0 && !is_timer))
|
|
goto already_waiting;
|
|
|
|
/* flushing, exit immediatly */
|
|
if (G_UNLIKELY (IS_FLUSHING (set)))
|
|
goto flushing;
|
|
|
|
do {
|
|
GstPollMode mode;
|
|
|
|
res = -1;
|
|
restarting = FALSE;
|
|
|
|
mode = choose_mode (set, timeout);
|
|
|
|
if (TEST_REBUILD (set)) {
|
|
g_mutex_lock (set->lock);
|
|
#ifndef G_OS_WIN32
|
|
g_array_set_size (set->active_fds, set->fds->len);
|
|
memcpy (set->active_fds->data, set->fds->data,
|
|
set->fds->len * sizeof (struct pollfd));
|
|
#else
|
|
if (!gst_poll_prepare_winsock_active_sets (set))
|
|
goto winsock_error;
|
|
#endif
|
|
g_mutex_unlock (set->lock);
|
|
}
|
|
|
|
switch (mode) {
|
|
case GST_POLL_MODE_AUTO:
|
|
g_assert_not_reached ();
|
|
break;
|
|
case GST_POLL_MODE_PPOLL:
|
|
{
|
|
#ifdef HAVE_PPOLL
|
|
struct timespec ts;
|
|
struct timespec *tsptr;
|
|
|
|
if (timeout != GST_CLOCK_TIME_NONE) {
|
|
GST_TIME_TO_TIMESPEC (timeout, ts);
|
|
tsptr = &ts;
|
|
} else {
|
|
tsptr = NULL;
|
|
}
|
|
|
|
res =
|
|
ppoll ((struct pollfd *) set->active_fds->data,
|
|
set->active_fds->len, tsptr, NULL);
|
|
#else
|
|
g_assert_not_reached ();
|
|
errno = ENOSYS;
|
|
#endif
|
|
break;
|
|
}
|
|
case GST_POLL_MODE_POLL:
|
|
{
|
|
#ifdef HAVE_POLL
|
|
gint t;
|
|
|
|
if (timeout != GST_CLOCK_TIME_NONE) {
|
|
t = GST_TIME_AS_MSECONDS (timeout);
|
|
} else {
|
|
t = -1;
|
|
}
|
|
|
|
res =
|
|
poll ((struct pollfd *) set->active_fds->data,
|
|
set->active_fds->len, t);
|
|
#else
|
|
g_assert_not_reached ();
|
|
errno = ENOSYS;
|
|
#endif
|
|
break;
|
|
}
|
|
case GST_POLL_MODE_PSELECT:
|
|
#ifndef HAVE_PSELECT
|
|
{
|
|
g_assert_not_reached ();
|
|
errno = ENOSYS;
|
|
break;
|
|
}
|
|
#endif
|
|
case GST_POLL_MODE_SELECT:
|
|
{
|
|
#ifndef G_OS_WIN32
|
|
fd_set readfds;
|
|
fd_set writefds;
|
|
fd_set errorfds;
|
|
gint max_fd;
|
|
|
|
max_fd = pollfd_to_fd_set (set, &readfds, &writefds, &errorfds);
|
|
|
|
if (mode == GST_POLL_MODE_SELECT) {
|
|
struct timeval tv;
|
|
struct timeval *tvptr;
|
|
|
|
if (timeout != GST_CLOCK_TIME_NONE) {
|
|
GST_TIME_TO_TIMEVAL (timeout, tv);
|
|
tvptr = &tv;
|
|
} else {
|
|
tvptr = NULL;
|
|
}
|
|
|
|
GST_DEBUG ("Calling select");
|
|
res = select (max_fd + 1, &readfds, &writefds, &errorfds, tvptr);
|
|
GST_DEBUG ("After select, res:%d", res);
|
|
} else {
|
|
#ifdef HAVE_PSELECT
|
|
struct timespec ts;
|
|
struct timespec *tsptr;
|
|
|
|
if (timeout != GST_CLOCK_TIME_NONE) {
|
|
GST_TIME_TO_TIMESPEC (timeout, ts);
|
|
tsptr = &ts;
|
|
} else {
|
|
tsptr = NULL;
|
|
}
|
|
|
|
GST_DEBUG ("Calling pselect");
|
|
res =
|
|
pselect (max_fd + 1, &readfds, &writefds, &errorfds, tsptr, NULL);
|
|
GST_DEBUG ("After pselect, res:%d", res);
|
|
#endif
|
|
}
|
|
|
|
if (res >= 0) {
|
|
fd_set_to_pollfd (set, &readfds, &writefds, &errorfds);
|
|
}
|
|
#else /* G_OS_WIN32 */
|
|
g_assert_not_reached ();
|
|
errno = ENOSYS;
|
|
#endif
|
|
break;
|
|
}
|
|
case GST_POLL_MODE_WINDOWS:
|
|
{
|
|
#ifdef G_OS_WIN32
|
|
gint ignore_count = set->active_fds_ignored->len;
|
|
DWORD t, wait_ret;
|
|
|
|
if (G_LIKELY (ignore_count == 0)) {
|
|
if (timeout != GST_CLOCK_TIME_NONE)
|
|
t = GST_TIME_AS_MSECONDS (timeout);
|
|
else
|
|
t = INFINITE;
|
|
} else {
|
|
/* already one or more ignored fds, so we quickly sweep the others */
|
|
t = 0;
|
|
}
|
|
|
|
wait_ret = WSAWaitForMultipleEvents (set->active_events->len,
|
|
(HANDLE *) set->active_events->data, FALSE, t, FALSE);
|
|
|
|
if (ignore_count == 0 && wait_ret == WSA_WAIT_TIMEOUT) {
|
|
res = 0;
|
|
} else if (wait_ret == WSA_WAIT_FAILED) {
|
|
res = -1;
|
|
errno = gst_poll_winsock_error_to_errno (WSAGetLastError ());
|
|
} else {
|
|
/* the first entry is the wakeup event */
|
|
if (wait_ret - WSA_WAIT_EVENT_0 >= 1) {
|
|
res = gst_poll_collect_winsock_events (set);
|
|
} else {
|
|
res = 1; /* wakeup event */
|
|
}
|
|
}
|
|
#else
|
|
g_assert_not_reached ();
|
|
errno = ENOSYS;
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!is_timer) {
|
|
/* Applications needs to clear the control socket themselves for timer
|
|
* polls.
|
|
* For other polls, we need to clear the control socket. If there was only
|
|
* one socket with activity and it was the control socket, we need to
|
|
* restart */
|
|
if (release_all_wakeup (set) > 0 && res == 1)
|
|
restarting = TRUE;
|
|
}
|
|
|
|
if (G_UNLIKELY (IS_FLUSHING (set))) {
|
|
/* we got woken up and we are flushing, we need to stop */
|
|
errno = EBUSY;
|
|
res = -1;
|
|
break;
|
|
}
|
|
} while (G_UNLIKELY (restarting));
|
|
|
|
DEC_WAITING (set);
|
|
|
|
return res;
|
|
|
|
/* ERRORS */
|
|
already_waiting:
|
|
{
|
|
DEC_WAITING (set);
|
|
errno = EPERM;
|
|
return -1;
|
|
}
|
|
flushing:
|
|
{
|
|
DEC_WAITING (set);
|
|
errno = EBUSY;
|
|
return -1;
|
|
}
|
|
#ifdef G_OS_WIN32
|
|
winsock_error:
|
|
{
|
|
g_mutex_unlock (set->lock);
|
|
DEC_WAITING (set);
|
|
return -1;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* gst_poll_set_controllable:
|
|
* @set: a #GstPoll.
|
|
* @controllable: new controllable state.
|
|
*
|
|
* When @controllable is %TRUE, this function ensures that future calls to
|
|
* gst_poll_wait() will be affected by gst_poll_restart() and
|
|
* gst_poll_set_flushing().
|
|
*
|
|
* Returns: %TRUE if the controllability of @set could be updated.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
gboolean
|
|
gst_poll_set_controllable (GstPoll * set, gboolean controllable)
|
|
{
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
|
|
GST_LOG ("%p: controllable : %d", set, controllable);
|
|
|
|
set->controllable = controllable;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_restart:
|
|
* @set: a #GstPoll.
|
|
*
|
|
* Restart any gst_poll_wait() that is in progress. This function is typically
|
|
* used after adding or removing descriptors to @set.
|
|
*
|
|
* If @set is not controllable, then this call will have no effect.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
void
|
|
gst_poll_restart (GstPoll * set)
|
|
{
|
|
g_return_if_fail (set != NULL);
|
|
|
|
if (set->controllable && GET_WAITING (set) > 0) {
|
|
/* we are controllable and waiting, wake up the waiter. The socket will be
|
|
* cleared by the _wait() thread and the poll will be restarted */
|
|
raise_wakeup (set);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_poll_set_flushing:
|
|
* @set: a #GstPoll.
|
|
* @flushing: new flushing state.
|
|
*
|
|
* When @flushing is %TRUE, this function ensures that current and future calls
|
|
* to gst_poll_wait() will return -1, with errno set to EBUSY.
|
|
*
|
|
* Unsetting the flushing state will restore normal operation of @set.
|
|
*
|
|
* Since: 0.10.18
|
|
*/
|
|
void
|
|
gst_poll_set_flushing (GstPoll * set, gboolean flushing)
|
|
{
|
|
g_return_if_fail (set != NULL);
|
|
|
|
/* update the new state first */
|
|
SET_FLUSHING (set, flushing);
|
|
|
|
if (flushing && set->controllable && GET_WAITING (set) > 0) {
|
|
/* we are flushing, controllable and waiting, wake up the waiter. When we
|
|
* stop the flushing operation we don't clear the wakeup fd here, this will
|
|
* happen in the _wait() thread. */
|
|
raise_wakeup (set);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_poll_write_control:
|
|
* @set: a #GstPoll.
|
|
*
|
|
* Write a byte to the control socket of the controllable @set.
|
|
* This function is mostly useful for timer #GstPoll objects created with
|
|
* gst_poll_new_timer().
|
|
*
|
|
* It will make any current and future gst_poll_wait() function return with
|
|
* 1, meaning the control socket is set. After an equal amount of calls to
|
|
* gst_poll_read_control() have been performed, calls to gst_poll_wait() will
|
|
* block again until their timeout expired.
|
|
*
|
|
* Returns: %TRUE on success. %FALSE when @set is not controllable or when the
|
|
* byte could not be written.
|
|
*
|
|
* Since: 0.10.23
|
|
*/
|
|
gboolean
|
|
gst_poll_write_control (GstPoll * set)
|
|
{
|
|
gboolean res;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (set->timer, FALSE);
|
|
|
|
res = raise_wakeup (set);
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* gst_poll_read_control:
|
|
* @set: a #GstPoll.
|
|
*
|
|
* Read a byte from the control socket of the controllable @set.
|
|
* This function is mostly useful for timer #GstPoll objects created with
|
|
* gst_poll_new_timer().
|
|
*
|
|
* Returns: %TRUE on success. %FALSE when @set is not controllable or when there
|
|
* was no byte to read.
|
|
*
|
|
* Since: 0.10.23
|
|
*/
|
|
gboolean
|
|
gst_poll_read_control (GstPoll * set)
|
|
{
|
|
gboolean res;
|
|
|
|
g_return_val_if_fail (set != NULL, FALSE);
|
|
g_return_val_if_fail (set->timer, FALSE);
|
|
|
|
res = release_wakeup (set);
|
|
|
|
return res;
|
|
}
|