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Add __sync_bool_compare_and_swap_4 for targets which don't have it.

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From-SVN: r169502
This commit is contained in:
Ian Lance Taylor 2011-02-01 20:15:13 +00:00
parent 22843acd31
commit e499b5eef4
1 changed files with 36 additions and 0 deletions
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36
libgo/runtime/thread.c
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@ -3,6 +3,7 @@
// license that can be found in the LICENSE file.
#include "runtime.h"
#include "go-assert.h"
void
runtime_initlock(Lock *l)
@ -75,3 +76,38 @@ runtime_destroylock(Lock *l)
{
sem_destroy(&l->sem);
}
#ifndef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
// For targets which don't have the required sync support. Really
// this should be provided by gcc itself. FIXME.
static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
_Bool
__sync_bool_compare_and_swap_4(uint32*, uint32, uint32)
__attribute__((visibility("hidden")));
_Bool
__sync_bool_compare_and_swap_4(uint32* ptr, uint32 old, uint32 new)
{
int i;
_Bool ret;
i = pthread_mutex_lock(&sync_lock);
__go_assert(i == 0);
if(*ptr != old) {
ret = 0;
} else {
*ptr = new;
ret = 1;
}
i = pthread_mutex_unlock(&sync_lock);
__go_assert(i == 0);
return ret;
}
#endif