tree c4c7c21b740773384c5bacec1a4fe856d0fe8618
parent 3d280aa4197396c33ee236b9c979e079b3020e9d
author Jonathan Peyton <jonathan.l.peyton@intel.com> 1554410129 +0000
committer Jonathan Peyton <jonathan.l.peyton@intel.com> 1554410129 +0000

[OpenMP] Fix hang on Windows

Debug dump on large machine shows when many OpenMP threads (401 in total)
sleep on a barrier, one of the innermost nesting levels sleeps
on a child's b_arrived flag whose value is equal to 4 and is equal to
checker value. i.e., (1) sleep bit is 0, and (2) done_check() would
return true if called.

It is unclear how this might happen. It could be Windows Server 2016's
error of EnterCriticalSection / LeaveCriticalSection, or
error of WaitForSingleObject / SetEvent / ResetEvent, or
error in the library which is very difficult to find.

As a workaround, change INFINITE wait to timed wait, so that each
thread awakens each 5 seconds (the timeout was chosen arbitrary to not
disturb other threads much), check flag condition under the lock, and
either go to sleep again or stop sleeping as a result of the check.

Patch by Andrey Churbanov

Differential Revision: https://reviews.llvm.org/D59793


git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@357722 91177308-0d34-0410-b5e6-96231b3b80d8