mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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6fc49a76a1
Original commit message from CVS: Let's take the performance hit (cache flush) on UP and make it work on SMP too. (thanks to Cameron Hutchison)
214 lines
6.1 KiB
C
214 lines
6.1 KiB
C
/* 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
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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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#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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union {
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atomic_t value;
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struct {
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int value;
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GMutex *lock;
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} unused;
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} v;
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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)->v.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)->v.value), (val)))
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#define GST_ATOMIC_INT_VALUE(ref) (atomic_read(&((ref)->v.value)))
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#define GST_ATOMIC_INT_READ(ref,res) (*res = atomic_read(&((ref)->v.value)))
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#define GST_ATOMIC_INT_INC(ref) (atomic_inc (&((ref)->v.value)))
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#define GST_ATOMIC_INT_DEC_AND_TEST(ref,zero) (*zero = atomic_dec_and_test (&((ref)->v.value)))
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#define GST_ATOMIC_INT_ADD(ref, count) (atomic_add ((count), &((ref)->v.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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#define GST_ATOMIC_LOCK "lock ; "
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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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" 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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