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/*
* atomic.c: Workarounds for atomic operations for platforms that dont have
* really atomic asm functions in atomic.h
*
* Author:
* Dick Porter (dick@ximian.com)
*
* (C) 2002 Ximian, Inc.
*/
#include <config.h>
#include <glib.h>
#include <mono/utils/atomic.h>
#if defined (WAPI_NO_ATOMIC_ASM) || !defined (HAS_64BITS_ATOMIC)
#include <pthread.h>
static pthread_mutex_t spin = PTHREAD_MUTEX_INITIALIZER;
#endif
#ifdef WAPI_NO_ATOMIC_ASM
static mono_once_t spin_once=MONO_ONCE_INIT;
static void spin_init(void)
{
g_warning("Using non-atomic functions! Expect race conditions when using process-shared handles!");
}
gint32 InterlockedCompareExchange(volatile gint32 *dest, gint32 exch,
gint32 comp)
{
gint32 old;
int ret;
mono_once(&spin_once, spin_init);
pthread_cleanup_push ((void(*)(void *))pthread_mutex_unlock,
(void *)&spin);
ret = pthread_mutex_lock(&spin);
g_assert (ret == 0);
old= *dest;
if(old==comp) {
*dest=exch;
}
ret = pthread_mutex_unlock(&spin);
g_assert (ret == 0);
pthread_cleanup_pop (0);
return(old);
}
gpointer InterlockedCompareExchangePointer(volatile gpointer *dest,
gpointer exch, gpointer comp)
{
gpointer old;
int ret;
mono_once(&spin_once, spin_init);
pthread_cleanup_push ((void(*)(void *))pthread_mutex_unlock,
(void *)&spin);
ret = pthread_mutex_lock(&spin);
g_assert (ret == 0);
old= *dest;
if(old==comp) {
*dest=exch;
}
ret = pthread_mutex_unlock(&spin);
g_assert (ret == 0);
pthread_cleanup_pop (0);
return(old);
}
gint32 InterlockedIncrement(volatile gint32 *dest)
{
gint32 ret;
int thr_ret;
mono_once(&spin_once, spin_init);
pthread_cleanup_push ((void(*)(void *))pthread_mutex_unlock,
(void *)&spin);
thr_ret = pthread_mutex_lock(&spin);
g_assert (thr_ret == 0);
(*dest)++;
ret= *dest;
thr_ret = pthread_mutex_unlock(&spin);
g_assert (thr_ret == 0);
pthread_cleanup_pop (0);
return(ret);
}
gint32 InterlockedDecrement(volatile gint32 *dest)
{
gint32 ret;
int thr_ret;
mono_once(&spin_once, spin_init);
pthread_cleanup_push ((void(*)(void *))pthread_mutex_unlock,
(void *)&spin);
thr_ret = pthread_mutex_lock(&spin);
g_assert (thr_ret == 0);
(*dest)--;
ret= *dest;
thr_ret = pthread_mutex_unlock(&spin);
g_assert (thr_ret == 0);
pthread_cleanup_pop (0);
return(ret);
}
gint32 InterlockedExchange(volatile gint32 *dest, gint32 exch)
{
gint32 ret;
int thr_ret;
mono_once(&spin_once, spin_init);
pthread_cleanup_push ((void(*)(void *))pthread_mutex_unlock,
(void *)&spin);
thr_ret = pthread_mutex_lock(&spin);
g_assert (thr_ret == 0);
ret=*dest;
*dest=exch;
thr_ret = pthread_mutex_unlock(&spin);
g_assert (thr_ret == 0);
pthread_cleanup_pop (0);
return(ret);
}
gpointer InterlockedExchangePointer(volatile gpointer *dest, gpointer exch)
{
gpointer ret;
int thr_ret;
mono_once(&spin_once, spin_init);
pthread_cleanup_push ((void(*)(void *))pthread_mutex_unlock,
(void *)&spin);
thr_ret = pthread_mutex_lock(&spin);
g_assert (thr_ret == 0);
ret=*dest;
*dest=exch;
thr_ret = pthread_mutex_unlock(&spin);
g_assert (thr_ret == 0);
pthread_cleanup_pop (0);
return(ret);
}
gint32 InterlockedExchangeAdd(volatile gint32 *dest, gint32 add)
{
gint32 ret;
int thr_ret;
mono_once(&spin_once, spin_init);
pthread_cleanup_push ((void(*)(void *))pthread_mutex_unlock,
(void *)&spin);
thr_ret = pthread_mutex_lock(&spin);
g_assert (thr_ret == 0);
ret= *dest;
*dest+=add;
thr_ret = pthread_mutex_unlock(&spin);
g_assert (thr_ret == 0);
pthread_cleanup_pop (0);
return(ret);
}
#endif
#ifndef HAS_64BITS_ATOMICS
#if defined (TARGET_MACH) && defined (TARGET_ARM) && (defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7S__))
gint64 InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp) __attribute__ ((naked));
gint64
InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp)
{
__asm__ (
"push {r4, r5, r6, r7}\n"
"ldr r4, [sp, #16]\n"
"dmb\n"
"1:\n"
"ldrexd r6, r7, [r0]\n"
"cmp r7, r4\n"
"bne 2f\n"
"cmp r6, r3\n"
"bne 2f\n"
"strexd r5, r1, r2, [r0]\n"
"cmp r5, #0\n"
"bne 1b\n"
"2:\n"
"dmb\n"
"mov r0, r6\n"
"mov r1, r7\n"
"pop {r4, r5, r6, r7}\n"
"bx lr\n"
);
}
#elif defined (TARGET_MACH) && (defined (TARGET_X86) || defined (TARGET_AMD64))
gint64
InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp)
{
return __sync_val_compare_and_swap (dest, comp, exch);
}
#else
gint64
InterlockedCompareExchange64(volatile gint64 *dest, gint64 exch, gint64 comp)
{
gint64 old;
pthread_mutex_lock (&spin);
old = *dest;
if(old == comp)
*dest = exch;
pthread_mutex_unlock (&spin);
return old;
}
#endif
#endif
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