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use atomic operations provided by the compiler if they are available (yay for gcc 4.1 users!)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@33953 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2006-06-13 21:35:29 +00:00
parent fca19e7635
commit eddf363a0e
4 changed files with 94 additions and 4 deletions
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19
include/asterisk/lock.h
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@@ -738,12 +738,17 @@ int ast_atomic_fetchadd_int_slow(volatile int *p, int v);
#include "asterisk/inline_api.h"
/*! \brief Atomically add v to *pp and return * the previous value of *p.
/*! \brief Atomically add v to *p and return * the previous value of *p.
* This can be used to handle reference counts, and the return value
* can be used to generate unique identifiers.
*/
#if defined ( __i386__)
#if defined(HAVE_GCC_ATOMICS)
AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
{
return __sync_fetch_and_add(p, v);
})
#elif defined ( __i386__)
AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
{
__asm __volatile (
@@ -763,12 +768,18 @@ AST_INLINE_API(int ast_atomic_fetchadd_int(volatile int *p, int v),
/*! \brief decrement *p by 1 and return true if the variable has reached 0.
* Useful e.g. to check if a refcount has reached 0.
*/
#if defined(HAVE_GCC_ATOMICS)
AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p),
{
return __sync_sub_and_fetch(p, 1) == 0;
})
#else
AST_INLINE_API(int ast_atomic_dec_and_test(volatile int *p),
{
int a = ast_atomic_fetchadd_int(p, -1);
return a == 1; /* true if the value is 0 now (so it was 1 previously) */
}
)
})
#endif
#ifndef DEBUG_CHANNEL_LOCKS
/*! \brief Lock a channel. If DEBUG_CHANNEL_LOCKS is defined