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Less lame "concurrency" support

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These APIs aren't thread safe, but they're pretending to be. Let's at
least make the getter as fast as they can be. The setters are a lost
cause unless the API can be fixed.

llvm-svn: 152786
This commit is contained in:
Dave Zarzycki 2012-03-15 08:58:08 +00:00
parent 13e35c086c
commit d6533ccd48
2 changed files with 6 additions and 6 deletions
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4
libcxxabi/src/cxa_default_handlers.cpp
View File

@ -103,7 +103,7 @@ set_unexpected(unexpected_handler func) _NOEXCEPT
{
if (func == 0)
func = default_unexpected_handler;
return __sync_lock_test_and_set(&__cxxabiapple::__cxa_unexpected_handler, func);
return __sync_swap(&__cxxabiapple::__cxa_unexpected_handler, func);
}
terminate_handler
@ -111,7 +111,7 @@ set_terminate(terminate_handler func) _NOEXCEPT
{
if (func == 0)
func = default_terminate_handler;
return __sync_lock_test_and_set(&__cxxabiapple::__cxa_terminate_handler, func);
return __sync_swap(&__cxxabiapple::__cxa_terminate_handler, func);
}
};

8
libcxxabi/src/cxa_handlers.cpp
View File

@ -28,7 +28,7 @@ namespace std
unexpected_handler
get_unexpected() _NOEXCEPT
{
return __sync_fetch_and_add(&__cxxabiapple::__cxa_unexpected_handler, (unexpected_handler)0);
return __cxxabiapple::__cxa_unexpected_handler;
}
__attribute__((visibility("hidden"), noreturn))
@ -50,7 +50,7 @@ unexpected()
terminate_handler
get_terminate() _NOEXCEPT
{
return __sync_fetch_and_add(&__cxxabiapple::__cxa_terminate_handler, (terminate_handler)0);
return __cxxabiapple::__cxa_terminate_handler;
}
__attribute__((visibility("hidden"), noreturn))
@ -101,13 +101,13 @@ terminate() _NOEXCEPT
new_handler
set_new_handler(new_handler handler) _NOEXCEPT
{
return __sync_lock_test_and_set(&__cxxabiapple::__cxa_new_handler, handler);
return __sync_swap(&__cxxabiapple::__cxa_new_handler, handler);
}
new_handler
get_new_handler() _NOEXCEPT
{
return __sync_fetch_and_add(&__cxxabiapple::__cxa_new_handler, (new_handler)0);
return __cxxabiapple::__cxa_new_handler;
}
} // std