mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-30 05:31:15 +00:00
b43cf3886a
Original commit message from CVS: Make sizeof(GstBuffer) independent of config.h and HAVE_ATOMIC_H. This still needs a more fundamental solution though.
217 lines
6.1 KiB
C
217 lines
6.1 KiB
C
/* 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_ATOMIC_H__
|
|
#define __GST_ATOMIC_H__
|
|
|
|
/* FIXME */
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#ifdef HAVE_ATOMIC_H
|
|
# include <asm/atomic.h>
|
|
#endif
|
|
|
|
#include <glib.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
typedef struct _GstAtomicInt GstAtomicInt;
|
|
|
|
struct _GstAtomicInt {
|
|
#ifdef HAVE_ATOMIC_H
|
|
union {
|
|
atomic_t value;
|
|
struct {
|
|
int value;
|
|
GMutex *lock;
|
|
} unused;
|
|
} v;
|
|
#else
|
|
int value;
|
|
GMutex *lock;
|
|
#endif
|
|
};
|
|
|
|
#ifdef HAVE_ATOMIC_H
|
|
|
|
/* atomic functions */
|
|
#define GST_ATOMIC_INT_INIT(ref, val) (atomic_set(&((ref)->v.value), (val)))
|
|
#define GST_ATOMIC_INT_FREE(ref)
|
|
|
|
#define GST_ATOMIC_INT_SET(ref,val) (atomic_set(&((ref)->v.value), (val)))
|
|
#define GST_ATOMIC_INT_VALUE(ref) (atomic_read(&((ref)->v.value)))
|
|
#define GST_ATOMIC_INT_READ(ref,res) (*res = atomic_read(&((ref)->v.value)))
|
|
#define GST_ATOMIC_INT_INC(ref) (atomic_inc (&((ref)->v.value)))
|
|
#define GST_ATOMIC_INT_DEC_AND_TEST(ref,zero) (*zero = atomic_dec_and_test (&((ref)->v.value)))
|
|
#define GST_ATOMIC_INT_ADD(ref, count) (atomic_add ((count), &((ref)->v.value)))
|
|
|
|
#else
|
|
|
|
/* fallback using a lock */
|
|
#define GST_ATOMIC_INT_INIT(ref, val) \
|
|
G_STMT_START { \
|
|
(ref)->value = (val); \
|
|
(ref)->lock = g_mutex_new(); \
|
|
} G_STMT_END
|
|
|
|
#define GST_ATOMIC_INT_FREE(ref) g_mutex_free ((ref)->lock)
|
|
|
|
#define GST_ATOMIC_INT_SET(ref,val) \
|
|
G_STMT_START { \
|
|
g_mutex_lock ((ref)->lock); \
|
|
(ref)->value = (val); \
|
|
g_mutex_unlock ((ref)->lock); \
|
|
} G_STMT_END
|
|
|
|
#define GST_ATOMIC_INT_VALUE(ref) ((ref)->value)
|
|
#define GST_ATOMIC_INT_READ(ref,res) \
|
|
G_STMT_START { \
|
|
g_mutex_lock ((ref)->lock); \
|
|
*res = (ref)->value; \
|
|
g_mutex_unlock ((ref)->lock); \
|
|
} G_STMT_END
|
|
|
|
#define GST_ATOMIC_INT_INC(ref) \
|
|
G_STMT_START { \
|
|
g_mutex_lock ((ref)->lock); \
|
|
(ref)->value++; \
|
|
g_mutex_unlock ((ref)->lock); \
|
|
} G_STMT_END
|
|
|
|
#define GST_ATOMIC_INT_DEC_AND_TEST(ref,zero) \
|
|
G_STMT_START { \
|
|
g_mutex_lock ((ref)->lock); \
|
|
(ref)->value--; \
|
|
*zero = ((ref)->value == 0); \
|
|
g_mutex_unlock ((ref)->lock); \
|
|
} G_STMT_END
|
|
|
|
#define GST_ATOMIC_INT_ADD(ref, count) \
|
|
G_STMT_START { \
|
|
g_mutex_lock ((ref)->lock); \
|
|
(ref)->value += count; \
|
|
g_mutex_unlock ((ref)->lock); \
|
|
} G_STMT_END
|
|
|
|
#endif /* HAVE_ATOMIC_H */
|
|
|
|
typedef struct _GstAtomicSwap GstAtomicSwap;
|
|
|
|
#define GST_ATOMIC_SWAP_VALUE(swap) ((swap)->value)
|
|
|
|
struct _GstAtomicSwap {
|
|
volatile gpointer value;
|
|
volatile gulong cnt; /* for the ABA problem */
|
|
GMutex *lock; /* lock for C fallback */
|
|
};
|
|
|
|
#if defined (__i386__) && defined (__GNUC__) && __GNUC__ >= 2
|
|
|
|
# ifdef __SMP__
|
|
# define GST_ATOMIC_LOCK "lock ; "
|
|
# else
|
|
# define GST_ATOMIC_LOCK ""
|
|
# endif
|
|
|
|
#define _GST_ATOMIC_SWAP_INIT(swap,val) \
|
|
G_STMT_START { \
|
|
(swap)->value = (gpointer)(val); \
|
|
(swap)->cnt = 0; \
|
|
} G_STMT_END
|
|
|
|
#define _GST_ATOMIC_SWAP(swap, val) \
|
|
G_STMT_START { \
|
|
__asm__ __volatile__ ("1:" \
|
|
" movl %2, (%1);" \
|
|
GST_ATOMIC_LOCK "cmpxchg %1, %0;" \
|
|
" jnz 1b;" \
|
|
: \
|
|
: "m" (*swap), \
|
|
"r" (val), \
|
|
"a" ((swap)->value)); \
|
|
} G_STMT_END
|
|
|
|
#define _GST_ATOMIC_SWAP_GET(swap, val, res) \
|
|
G_STMT_START { \
|
|
__asm__ __volatile__ (" testl %%eax, %%eax;" \
|
|
" jz 20f;" \
|
|
"10:" \
|
|
" movl (%%eax), %%ebx;" \
|
|
" movl %%edx, %%ecx;" \
|
|
" incl %%ecx;" \
|
|
GST_ATOMIC_LOCK "cmpxchg8b %1;" \
|
|
" jnz 10b;" \
|
|
"20:\t" \
|
|
: "=a" (*res) \
|
|
: "m" (*(swap)), \
|
|
"a" (val), \
|
|
"d" ((swap)->cnt) \
|
|
: "ecx", "ebx"); \
|
|
} G_STMT_END
|
|
|
|
#else
|
|
|
|
#define _GST_ATOMIC_SWAP_INIT(swap,val) \
|
|
G_STMT_START { \
|
|
(swap)->lock = g_mutex_new(); \
|
|
(swap)->value = (gpointer)val; \
|
|
} G_STMT_END
|
|
|
|
#define _GST_ATOMIC_SWAP(swap, val) \
|
|
G_STMT_START { \
|
|
gpointer tmp; \
|
|
g_mutex_lock ((swap)->lock); \
|
|
tmp = (swap)->value; \
|
|
(swap)->value = val; \
|
|
((gpointer)*val) = tmp; \
|
|
g_mutex_unlock ((swap)->lock); \
|
|
} G_STMT_END
|
|
|
|
#define _GST_ATOMIC_SWAP_GET(swap, val, res) \
|
|
G_STMT_START { \
|
|
if (val) { \
|
|
gpointer tmp; \
|
|
gint *tmp2; /* this is pretty EVIL */ \
|
|
g_mutex_lock ((swap)->lock); \
|
|
tmp = (swap)->value; \
|
|
tmp2 = val; \
|
|
(swap)->value = (gpointer)*tmp2; \
|
|
(*res) = (gpointer)*tmp2 = tmp; \
|
|
g_mutex_unlock ((swap)->lock); \
|
|
} \
|
|
} G_STMT_END
|
|
#endif
|
|
|
|
/* initialize the swap structure with an initial value */
|
|
#define GST_ATOMIC_SWAP_INIT(swap,val) _GST_ATOMIC_SWAP_INIT(swap, val)
|
|
|
|
/* atomically swap the contents the swap value with the value pointed to
|
|
* by val. */
|
|
#define GST_ATOMIC_SWAP(swap, val) _GST_ATOMIC_SWAP(swap, val)
|
|
|
|
/* atomically swap the contents the swap value with the value pointed to
|
|
* by val. The new value of the swap value is returned in the memory pointed
|
|
* to by res */
|
|
#define GST_ATOMIC_SWAP_GET(swap,val,res) _GST_ATOMIC_SWAP_GET(swap, val, res)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_ATOMIC_H__ */
|