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freebsd/contrib/libcxxrt/atomic.h

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Import b9db3a010143160624f123763025ab544b69bd9a of libcxxrt. This brings in three fixes: - Don't treat pointers to members as pointers in catch blocks (they're usually fat pointers). - Correctly catch foreign exceptions in catchalls. - Ensure that a happens-before relationship is established when setting terminate handlers in one thread and calling them in another.
2013-01-11 15:00:43 +00:00
#ifndef __has_builtin
#define __has_builtin(x) 0
#endif
#ifndef __has_feature
#define __has_feature(x) 0
#endif
/**
* Swap macro that enforces a happens-before relationship with a corresponding
* ATOMIC_LOAD.
*/
Import c812a07cd2f95c1403baf0bbe0366e7618d1d6d3 of libcxxrt: * Fix a copy-and-paste error when setting the unexpected exception handler (actually set the terminate handler by mistake). * Fix some warnings. Patch by Joerg Sonnenberger! * Don't call the _fast version of the TLS accessor in terminate() or unexpected(). 1) TLS may not have been set up yet. 2) When we're in one of these functions, Really Bad Stuff has happened and potentially saving a few cycles really isn't important. * Merge in fixes from FreeBSD trunk to make atomics work with recent clang.
2013-04-27 17:19:07 +00:00
#if __has_builtin(__c11_atomic_exchange)
Import b9db3a010143160624f123763025ab544b69bd9a of libcxxrt. This brings in three fixes: - Don't treat pointers to members as pointers in catch blocks (they're usually fat pointers). - Correctly catch foreign exceptions in catchalls. - Ensure that a happens-before relationship is established when setting terminate handlers in one thread and calling them in another.
2013-01-11 15:00:43 +00:00
#define ATOMIC_SWAP(addr, val)\
Import c812a07cd2f95c1403baf0bbe0366e7618d1d6d3 of libcxxrt: * Fix a copy-and-paste error when setting the unexpected exception handler (actually set the terminate handler by mistake). * Fix some warnings. Patch by Joerg Sonnenberger! * Don't call the _fast version of the TLS accessor in terminate() or unexpected(). 1) TLS may not have been set up yet. 2) When we're in one of these functions, Really Bad Stuff has happened and potentially saving a few cycles really isn't important. * Merge in fixes from FreeBSD trunk to make atomics work with recent clang.
2013-04-27 17:19:07 +00:00
__c11_atomic_exchange((_Atomic(__typeof__(val))*)addr, val, __ATOMIC_ACQ_REL)
Import b9db3a010143160624f123763025ab544b69bd9a of libcxxrt. This brings in three fixes: - Don't treat pointers to members as pointers in catch blocks (they're usually fat pointers). - Correctly catch foreign exceptions in catchalls. - Ensure that a happens-before relationship is established when setting terminate handlers in one thread and calling them in another.
2013-01-11 15:00:43 +00:00
#elif __has_builtin(__sync_swap)
#define ATOMIC_SWAP(addr, val)\
__sync_swap(addr, val)
#else
#define ATOMIC_SWAP(addr, val)\
__sync_lock_test_and_set(addr, val)
#endif
Import c812a07cd2f95c1403baf0bbe0366e7618d1d6d3 of libcxxrt: * Fix a copy-and-paste error when setting the unexpected exception handler (actually set the terminate handler by mistake). * Fix some warnings. Patch by Joerg Sonnenberger! * Don't call the _fast version of the TLS accessor in terminate() or unexpected(). 1) TLS may not have been set up yet. 2) When we're in one of these functions, Really Bad Stuff has happened and potentially saving a few cycles really isn't important. * Merge in fixes from FreeBSD trunk to make atomics work with recent clang.
2013-04-27 17:19:07 +00:00
#if __has_builtin(__c11_atomic_load)
Import b9db3a010143160624f123763025ab544b69bd9a of libcxxrt. This brings in three fixes: - Don't treat pointers to members as pointers in catch blocks (they're usually fat pointers). - Correctly catch foreign exceptions in catchalls. - Ensure that a happens-before relationship is established when setting terminate handlers in one thread and calling them in another.
2013-01-11 15:00:43 +00:00
#define ATOMIC_LOAD(addr)\
Import c812a07cd2f95c1403baf0bbe0366e7618d1d6d3 of libcxxrt: * Fix a copy-and-paste error when setting the unexpected exception handler (actually set the terminate handler by mistake). * Fix some warnings. Patch by Joerg Sonnenberger! * Don't call the _fast version of the TLS accessor in terminate() or unexpected(). 1) TLS may not have been set up yet. 2) When we're in one of these functions, Really Bad Stuff has happened and potentially saving a few cycles really isn't important. * Merge in fixes from FreeBSD trunk to make atomics work with recent clang.
2013-04-27 17:19:07 +00:00
__c11_atomic_load((_Atomic(__typeof__(*addr))*)addr, __ATOMIC_ACQUIRE)
Import b9db3a010143160624f123763025ab544b69bd9a of libcxxrt. This brings in three fixes: - Don't treat pointers to members as pointers in catch blocks (they're usually fat pointers). - Correctly catch foreign exceptions in catchalls. - Ensure that a happens-before relationship is established when setting terminate handlers in one thread and calling them in another.
2013-01-11 15:00:43 +00:00
#else
#define ATOMIC_LOAD(addr)\
(__sync_synchronize(), *addr)
#endif
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