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eee690b29a
Another attempt at fixing tsan_invisible_barrier. Current implementation causes: https://llvm.org/bugs/show_bug.cgi?id=25643 There were several unsuccessful iterations for this functionality: Initially it was implemented in user code using REAL(pthread_barrier_wait). But pthread_barrier_wait is not supported on MacOS. Futexes are linux-specific for this matter. Then we switched to atomics+usleep(10). But usleep produced parasitic "as-if synchronized via sleep" messages in reports which failed some output tests. Then we switched to atomics+sched_yield. But this produced tons of tsan- visible events, which lead to "failed to restore stack trace" failures. Move implementation into runtime and use internal_sched_yield in the wait loop. This way tsan should see no events from the barrier, so not trace overflows and no "as-if synchronized via sleep" messages. llvm-svn: 255030
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