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poll: small cleanups

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This commit is contained in:
Wim Taymans 2010-12-03 12:42:10 +01:00
parent 9bf56084cf
commit 77830123cf
1 changed files with 16 additions and 17 deletions
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33
gst/gstpoll.c
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@ -128,6 +128,7 @@ struct _GstPoll
GArray *active_fds;
#ifndef G_OS_WIN32
gchar buf[1];
GstPollFD control_read_fd;
GstPollFD control_write_fd;
#else
@ -160,6 +161,14 @@ static gboolean gst_poll_add_fd_unlocked (GstPoll * set, GstPollFD * fd);
#define TEST_REBUILD(s) (g_atomic_int_compare_and_exchange(&(s)->rebuild, 1, 0))
#define MARK_REBUILD(s) (g_atomic_int_set(&(s)->rebuild, 1))
#ifndef G_OS_WIN32
#define WAKE_EVENT(s) (write ((s)->control_write_fd.fd, "W", 1) == 1)
#define RELEASE_EVENT(s) (read ((s)->control_read_fd.fd, (s)->buf, 1) == 1)
#else
#define WAKE_EVENT(s) (SetEvent ((s)->wakeup_event))
#define RELEASE_EVENT(s) (ResetEvent ((s)->wakeup_event))
#endif
/* the poll/select call is also performed on a control socket, that way
* we can send special commands to control it */
static inline gboolean
@ -168,27 +177,22 @@ raise_wakeup (GstPoll * set)
gboolean result = TRUE;
if (g_atomic_int_exchange_and_add (&set->control_pending, 1) == 0) {
#ifndef G_OS_WIN32
result = (write (set->control_write_fd.fd, "W", 1) == 1);
#else
result = SetEvent (set->wakeup_event);
#endif
/* raise when nothing pending */
result = WAKE_EVENT (set);
}
return result;
}
/* note how bad things can happen when the 2 threads both raise and release the
* wakeup. This is however not a problem because you must always pair a raise
* with a release */
static inline gboolean
release_wakeup (GstPoll * set)
{
gboolean result = TRUE;
if (g_atomic_int_dec_and_test (&set->control_pending)) {
#ifndef G_OS_WIN32
gchar buf[1];
result = (read (set->control_read_fd.fd, buf, 1) == 1);
#else
result = ResetEvent (set->wakeup_event);
#endif
result = RELEASE_EVENT (set);
}
return result;
}
@ -207,12 +211,7 @@ release_all_wakeup (GstPoll * set)
/* try to remove all pending control messages */
if (g_atomic_int_compare_and_exchange (&set->control_pending, old, 0)) {
/* we managed to remove all messages, read the control socket */
#ifndef G_OS_WIN32
gchar buf[1];
result = (read (set->control_read_fd.fd, buf, 1) == 1);
#else
result = ResetEvent (set->wakeup_event);
#endif
result = RELEASE_EVENT (set);
break;
}
}