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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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- Added a bunch of fast atomic operations on x86 with C fallbacks
Original commit message from CVS: - Added a bunch of fast atomic operations on x86 with C fallbacks - Added the code for refcounting in GstData - Added a gstmemchunk allocator using atomic operations
This commit is contained in:
Wim Taymans
parent
80c371342b
commit
74b6b732f1
213
gst/gstatomic.h
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213
gst/gstatomic.h
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@ -0,0 +1,213 @@
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/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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
|
||||
* 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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#ifndef __GST_ATOMIC_H__
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#define __GST_ATOMIC_H__
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/* FIXME */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_ATOMIC_H
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# include <asm/atomic.h>
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#endif
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#include <glib.h>
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G_BEGIN_DECLS
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typedef struct _GstAtomicInt GstAtomicInt;
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struct _GstAtomicInt {
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#ifdef HAVE_ATOMIC_H
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atomic_t value;
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#else
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int value;
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GMutex *lock;
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#endif
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};
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#ifdef HAVE_ATOMIC_H
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/* atomic functions */
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#define GST_ATOMIC_INT_INIT(ref, val) (atomic_set(&((ref)->value), (val)))
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#define GST_ATOMIC_INT_FREE(ref)
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#define GST_ATOMIC_INT_SET(ref,val) (atomic_set(&((ref)->value), (val)))
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#define GST_ATOMIC_INT_VALUE(ref) (atomic_read(&((ref)->value)))
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#define GST_ATOMIC_INT_READ(ref,res) (*res = atomic_read(&((ref)->value)))
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#define GST_ATOMIC_INT_INC(ref) (atomic_inc (&((ref)->value)))
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#define GST_ATOMIC_INT_DEC_AND_TEST(ref,zero) (*zero = atomic_dec_and_test (&((ref)->value)))
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#define GST_ATOMIC_INT_ADD(ref, count) (atomic_add ((count), &((ref)->value)))
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#else
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/* fallback using a lock */
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#define GST_ATOMIC_INT_INIT(ref, val) \
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G_STMT_START { \
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(ref)->value = (val); \
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(ref)->lock = g_mutex_new(); \
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} G_STMT_END
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#define GST_ATOMIC_INT_FREE(ref) g_mutex_free (&(ref)->lock)
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#define GST_ATOMIC_INT_SET(ref,val) \
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G_STMT_START { \
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g_mutex_lock ((ref)->lock); \
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(ref)->value = (val); \
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g_mutex_unlock ((ref)->lock); \
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} G_STMT_END
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#define GST_ATOMIC_INT_VALUE(ref) ((ref)->value)
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#define GST_ATOMIC_INT_READ(ref,res) \
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G_STMT_START { \
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g_mutex_lock ((ref)->lock); \
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*res = (ref)->value; \
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g_mutex_unlock ((ref)->lock); \
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} G_STMT_END
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#define GST_ATOMIC_INT_INC(ref) \
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G_STMT_START { \
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g_mutex_lock ((ref)->lock); \
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(ref)->value++; \
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g_mutex_unlock ((ref)->lock); \
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} G_STMT_END
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#define GST_ATOMIC_INT_DEC_AND_TEST(ref,zero) \
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G_STMT_START { \
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g_mutex_lock ((ref)->lock); \
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(ref)->value--; \
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*zero = ((ref)->value == 0); \
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g_mutex_unlock ((ref)->lock); \
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} G_STMT_END
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#define GST_ATOMIC_INT_ADD(ref, count) \
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G_STMT_START { \
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g_mutex_lock ((ref)->lock); \
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(ref)->value += count; \
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g_mutex_unlock ((ref)->lock); \
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} G_STMT_END
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#endif /* HAVE_ATOMIC_H */
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typedef struct _GstAtomicSwap GstAtomicSwap;
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#define GST_ATOMIC_SWAP_VALUE(swap) ((swap)->value)
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struct _GstAtomicSwap {
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volatile gpointer value;
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volatile gulong cnt; /* for the ABA problem */
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GMutex *lock; /* lock for C fallback */
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};
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#if defined (__i386__) && defined (__GNUC__) && __GNUC__ >= 2
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# ifdef __SMP__
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# define GST_ATOMIC_LOCK "lock ; "
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# else
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# define GST_ATOMIC_LOCK ""
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# endif
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#define _GST_ATOMIC_SWAP_INIT(swap,val) \
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G_STMT_START { \
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(swap)->value = (gpointer)(val); \
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(swap)->cnt = 0; \
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} G_STMT_END
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#define _GST_ATOMIC_SWAP(swap, val) \
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G_STMT_START { \
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__asm__ __volatile__ ("1:" \
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" movl %2, (%1);" \
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GST_ATOMIC_LOCK "cmpxchg %1, %0;" \
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" jnz 1b;" \
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: \
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: "m" (*swap), \
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"r" (val), \
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"a" ((swap)->value)); \
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} G_STMT_END
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#define _GST_ATOMIC_SWAP_GET(swap, val, res) \
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G_STMT_START { \
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__asm__ __volatile__ (" testl %%eax, %%eax;" \
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" jz 20f;" \
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"10:" \
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" movl (%%eax), %%ebx;" \
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" movl %%edx, %%ecx;" \
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" incl %%ecx;" \
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GST_ATOMIC_LOCK "cmpxchg8b %1;" \
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" jz 20f;" \
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" testl %%eax, %%eax;" \
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" jnz 10b;" \
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"20:\t" \
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: "=a" (*res) \
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: "m" (*(swap)), \
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"a" (val), \
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"d" ((swap)->cnt) \
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: "ecx", "ebx"); \
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} G_STMT_END
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#else
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#define _GST_ATOMIC_SWAP_INIT(swap,val) \
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G_STMT_START { \
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(swap)->lock = g_mutex_new(); \
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(swap)->value = (gpointer)val; \
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} G_STMT_END
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#define _GST_ATOMIC_SWAP(swap, val) \
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G_STMT_START { \
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gpointer tmp; \
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g_mutex_lock ((swap)->lock); \
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tmp = (swap)->value; \
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(swap)->value = val; \
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((gpointer)*val) = tmp; \
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g_mutex_unlock ((swap)->lock); \
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} G_STMT_END
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#define _GST_ATOMIC_SWAP_GET(swap, val, res) \
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G_STMT_START { \
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if (val) { \
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gpointer tmp; \
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gint *tmp2; /* this is pretty EVIL */ \
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g_mutex_lock ((swap)->lock); \
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tmp = (swap)->value; \
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tmp2 = val; \
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(swap)->value = (gpointer)*tmp2; \
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(*res) = (gpointer)*tmp2 = tmp; \
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g_mutex_unlock ((swap)->lock); \
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} \
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} G_STMT_END
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#endif
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/* initialize the swap structure with an initial value */
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#define GST_ATOMIC_SWAP_INIT(swap,val) _GST_ATOMIC_SWAP_INIT(swap, val)
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/* atomically swap the contents the swap value with the value pointed to
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* by val. */
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#define GST_ATOMIC_SWAP(swap, val) _GST_ATOMIC_SWAP(swap, val)
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/* atomically swap the contents the swap value with the value pointed to
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* by val. The new value of the swap value is returned in the memory pointed
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* to by res */
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#define GST_ATOMIC_SWAP_GET(swap,val,res) _GST_ATOMIC_SWAP_GET(swap, val, res)
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G_END_DECLS
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#endif /* __GST_ATOMIC_H__ */
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165
gst/gstdata.c
Normal file
165
gst/gstdata.c
Normal file
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@ -0,0 +1,165 @@
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/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstdata.c: Data operations
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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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/* this file makes too much noise for most debugging sessions */
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#define GST_DEBUG_FORCE_DISABLE
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#include "gst_private.h"
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#include "gstdata.h"
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#include "gstdata_private.h"
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#include "gstlog.h"
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void
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_gst_data_init (GstData *data, GType type, guint16 flags, GstDataFreeFunction free, GstDataCopyFunction copy)
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{
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_GST_DATA_INIT (data, type, flags, free, copy);
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}
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void
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_gst_data_free (GstData *data)
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{
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_GST_DATA_DISPOSE (data);
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g_free (data);
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}
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/**
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* gst_data_copy:
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* @data: a #GstData to copy
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*
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* Copies the given #GstData
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*
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* Returns: a copy of the data or NULL if the data cannot be copied.
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*/
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GstData*
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gst_data_copy (const GstData *data)
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{
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if (data->copy)
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return data->copy (data);
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return NULL;
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}
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/**
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* gst_data_copy_on_write:
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* @data: a #GstData to copy
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*
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* Copies the given #GstData if the refcount is greater than 1 so that the
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* #GstData object can be written to safely.
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*
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* Returns: a copy of the data if the refcount is > 1, data if the refcount == 1
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* or NULL if the data could not be copied.
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*/
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GstData*
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gst_data_copy_on_write (const GstData *data)
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{
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gint refcount;
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GST_ATOMIC_INT_READ (&data->refcount, &refcount);
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if (refcount == 1)
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return GST_DATA (data);
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if (data->copy)
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return data->copy (data);
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return NULL;
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}
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/**
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* gst_data_free:
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* @data: a #GstData to free
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*
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* Frees the given #GstData
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*/
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void
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gst_data_free (GstData *data)
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{
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if (data->free)
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data->free (data);
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}
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/**
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* gst_data_ref:
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* @data: a #GstData to reference
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*
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* Increments the reference count of this data.
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*
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* Returns: the data
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*/
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GstData*
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gst_data_ref (GstData *data)
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{
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g_return_val_if_fail (data != NULL, NULL);
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g_return_val_if_fail (GST_DATA_REFCOUNT_VALUE(data) > 0, NULL);
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GST_ATOMIC_INT_INC (&data->refcount);
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return data;
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}
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/**
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* gst_data_ref_by_count:
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* @data: a #GstData to reference
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* @count: the number to increment the reference count by
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*
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* Increments the reference count of this data by the given number.
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*
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* Returns: the data
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*/
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GstData*
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gst_data_ref_by_count (GstData *data, gint count)
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{
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g_return_val_if_fail (data != NULL, NULL);
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g_return_val_if_fail (count >= 0, NULL);
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g_return_val_if_fail (GST_DATA_REFCOUNT_VALUE(data) > 0, NULL);
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GST_ATOMIC_INT_ADD (&data->refcount, count);
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return data;
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}
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/**
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* gst_data_unref:
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* @data: a #GstData to unreference
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*
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* Decrements the refcount of this data. If the refcount is
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* zero, the data will be freeed.
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*/
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void
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gst_data_unref (GstData *data)
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{
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gint zero;
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g_return_if_fail (data != NULL);
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GST_INFO (GST_CAT_BUFFER, "unref data %p, current count is %d", data,GST_DATA_REFCOUNT_VALUE(data));
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g_return_if_fail (GST_DATA_REFCOUNT_VALUE(data) > 0);
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GST_ATOMIC_INT_DEC_AND_TEST (&data->refcount, &zero);
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/* if we ended up with the refcount at zero, free the data */
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if (zero) {
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if (data->free)
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data->free (data);
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}
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}
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|
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36
gst/gstdata_private.h
Normal file
36
gst/gstdata_private.h
Normal file
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@ -0,0 +1,36 @@
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/* GStreamer
|
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
|
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* 2000 Wim Taymans <wtay@chello.be>
|
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*
|
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* gstdata.c: Data operations
|
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*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Library General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2 of the License, or (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* Library General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Library General Public
|
||||
* License along with this library; if not, write to the
|
||||
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
* Boston, MA 02111-1307, USA.
|
||||
*/
|
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|
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#define _GST_DATA_INIT(data, ptype, pflags, pfree, pcopy) \
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G_STMT_START { \
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GST_ATOMIC_INT_INIT (&(data)->refcount, 1); \
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(data)->type = ptype; \
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(data)->flags = pflags; \
|
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(data)->free = pfree; \
|
||||
(data)->copy = pcopy; \
|
||||
} G_STMT_END;
|
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|
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#define _GST_DATA_DISPOSE(data) \
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G_STMT_START { \
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GST_ATOMIC_INT_FREE (&(data)->refcount); \
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} G_STMT_END;
|
||||
|
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159
gst/gstmemchunk.c
Normal file
159
gst/gstmemchunk.c
Normal file
|
|
@ -0,0 +1,159 @@
|
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/* GStreamer
|
||||
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Library General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2 of the License, or (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* Library General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Library General Public
|
||||
* License along with this library; if not, write to the
|
||||
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
* Boston, MA 02111-1307, USA.
|
||||
*/
|
||||
|
||||
#include <string.h> /* memset */
|
||||
|
||||
#include "gstlog.h"
|
||||
#include "gstmemchunk.h"
|
||||
#include "gstutils.h"
|
||||
|
||||
#define GST_MEM_CHUNK_AREA(chunk) (((GstMemChunkElement*)(chunk))->area)
|
||||
#define GST_MEM_CHUNK_DATA(chunk) ((gpointer)(((GstMemChunkElement*)(chunk)) + 1))
|
||||
#define GST_MEM_CHUNK_LINK(mem) ((GstMemChunkElement*)((guint8*)(mem) - sizeof (GstMemChunkElement)))
|
||||
|
||||
/*******************************************************
|
||||
* area size
|
||||
* +-----------------------------------------+
|
||||
* chunk size
|
||||
* +------------+
|
||||
*
|
||||
* !next!data... !next!data.... !next!data...
|
||||
* ! ^ ! ^ !
|
||||
* +-------------+ +------------+ +---> NULL
|
||||
*
|
||||
*/
|
||||
static gboolean
|
||||
populate (GstMemChunk *mem_chunk)
|
||||
{
|
||||
guint8 *area;
|
||||
gint i;
|
||||
|
||||
if (mem_chunk->cleanup)
|
||||
return FALSE;
|
||||
|
||||
area = (guint8 *) g_malloc0 (mem_chunk->area_size);
|
||||
|
||||
for (i=0; i < mem_chunk->area_size; i += mem_chunk->chunk_size) {
|
||||
GST_MEM_CHUNK_AREA (area + i) = (GstMemChunkElement *)area;
|
||||
gst_mem_chunk_free (mem_chunk, GST_MEM_CHUNK_DATA (area + i));
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
GstMemChunk*
|
||||
gst_mem_chunk_new (gchar* name, gint atom_size, gulong area_size, gint type)
|
||||
{
|
||||
GstMemChunk *mem_chunk;
|
||||
|
||||
g_return_val_if_fail (atom_size > 0, NULL);
|
||||
g_return_val_if_fail (area_size >= atom_size, NULL);
|
||||
|
||||
mem_chunk = g_malloc (sizeof (GstMemChunk));
|
||||
|
||||
mem_chunk->chunk_size = atom_size + sizeof (GstMemChunkElement);
|
||||
area_size = (area_size/atom_size) * mem_chunk->chunk_size;
|
||||
|
||||
mem_chunk->name = g_strdup (name);
|
||||
mem_chunk->atom_size = atom_size;
|
||||
mem_chunk->area_size = area_size;
|
||||
mem_chunk->cleanup = FALSE;
|
||||
GST_ATOMIC_SWAP_INIT (&mem_chunk->swap, NULL);
|
||||
|
||||
populate (mem_chunk);
|
||||
|
||||
return mem_chunk;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
free_area (gpointer key, gpointer value, gpointer user_data)
|
||||
{
|
||||
g_free (key);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
void
|
||||
gst_mem_chunk_destroy (GstMemChunk *mem_chunk)
|
||||
{
|
||||
GHashTable *elements = g_hash_table_new (NULL, NULL);
|
||||
gpointer data;
|
||||
|
||||
mem_chunk->cleanup = TRUE;
|
||||
|
||||
data = gst_mem_chunk_alloc (mem_chunk);
|
||||
while (data) {
|
||||
GstMemChunkElement *elem = GST_MEM_CHUNK_LINK (data);
|
||||
|
||||
g_hash_table_insert (elements, GST_MEM_CHUNK_AREA (elem), NULL);
|
||||
|
||||
data = gst_mem_chunk_alloc (mem_chunk);
|
||||
}
|
||||
g_hash_table_foreach_remove (elements, free_area, NULL);
|
||||
|
||||
g_hash_table_destroy (elements);
|
||||
g_free (mem_chunk->name);
|
||||
g_free (mem_chunk);
|
||||
}
|
||||
|
||||
gpointer
|
||||
gst_mem_chunk_alloc (GstMemChunk *mem_chunk)
|
||||
{
|
||||
GstMemChunkElement *chunk = NULL;
|
||||
|
||||
g_return_val_if_fail (mem_chunk != NULL, NULL);
|
||||
|
||||
again:
|
||||
GST_ATOMIC_SWAP_GET (&mem_chunk->swap,
|
||||
GST_ATOMIC_SWAP_VALUE (&mem_chunk->swap),
|
||||
&chunk);
|
||||
|
||||
if (!chunk) {
|
||||
if (populate (mem_chunk))
|
||||
goto again;
|
||||
else
|
||||
return NULL;
|
||||
}
|
||||
return GST_MEM_CHUNK_DATA (chunk);
|
||||
}
|
||||
|
||||
gpointer
|
||||
gst_mem_chunk_alloc0 (GstMemChunk *mem_chunk)
|
||||
{
|
||||
gpointer mem = gst_mem_chunk_alloc (mem_chunk);
|
||||
|
||||
if (mem)
|
||||
memset (mem, 0, mem_chunk->atom_size);
|
||||
|
||||
return mem;
|
||||
}
|
||||
|
||||
void
|
||||
gst_mem_chunk_free (GstMemChunk *mem_chunk, gpointer mem)
|
||||
{
|
||||
GstMemChunkElement *chunk;
|
||||
|
||||
g_return_if_fail (mem_chunk != NULL);
|
||||
g_return_if_fail (mem != NULL);
|
||||
|
||||
chunk = GST_MEM_CHUNK_LINK (mem);
|
||||
|
||||
GST_ATOMIC_SWAP (&mem_chunk->swap, &chunk->link);
|
||||
}
|
||||
67
gst/gstmemchunk.h
Normal file
67
gst/gstmemchunk.h
Normal file
|
|
@ -0,0 +1,67 @@
|
|||
/* GStreamer
|
||||
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Library General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2 of the License, or (at your option) any later version.
|
||||
*
|
||||
* This library is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* Library General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Library General Public
|
||||
* License along with this library; if not, write to the
|
||||
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||||
* Boston, MA 02111-1307, USA.
|
||||
*/
|
||||
|
||||
#ifndef __GST_MEM_CHUNK_H__
|
||||
#define __GST_MEM_CHUNK_H__
|
||||
|
||||
#include <glib.h>
|
||||
#include <gst/gstatomic.h>
|
||||
|
||||
G_BEGIN_DECLS
|
||||
|
||||
typedef struct _GstMemChunk GstMemChunk;
|
||||
typedef struct _GstMemChunkElement GstMemChunkElement;
|
||||
|
||||
struct _GstMemChunkElement
|
||||
{
|
||||
GstMemChunkElement *link; /* next cell in the lifo */
|
||||
GstMemChunkElement *area;
|
||||
};
|
||||
|
||||
struct _GstMemChunk
|
||||
{
|
||||
#if 0
|
||||
volatile GstMemChunkElement *free; /* the first free element */
|
||||
volatile gulong cnt; /* used to avoid ABA problem */
|
||||
#endif
|
||||
GstAtomicSwap swap;
|
||||
|
||||
gchar *name;
|
||||
gulong area_size;
|
||||
gulong chunk_size;
|
||||
gulong atom_size;
|
||||
gboolean cleanup;
|
||||
GMutex *lock;
|
||||
};
|
||||
|
||||
GstMemChunk* gst_mem_chunk_new (gchar *name,
|
||||
gint atom_size,
|
||||
gulong area_size,
|
||||
gint type);
|
||||
|
||||
void gst_mem_chunk_destroy (GstMemChunk *mem_chunk);
|
||||
|
||||
gpointer gst_mem_chunk_alloc (GstMemChunk *mem_chunk);
|
||||
gpointer gst_mem_chunk_alloc0 (GstMemChunk *mem_chunk);
|
||||
void gst_mem_chunk_free (GstMemChunk *mem_chunk,
|
||||
gpointer mem);
|
||||
|
||||
G_END_DECLS
|
||||
|
||||
#endif /* __GST_MEM_CHUNK_H__ */
|
||||
Loading…
Reference in a new issue