[PATCH] D36767: Implement the standard for timeouts for std::condition_variable

[Tom via Phabricator via cfe-commits]

tomcherry created this revision.

The C++ standard calls for wait_for() to use steady clock and
 wait_until() to use the clock that is provided as an argument.  This
 is not currently done in libc++ and is not possible with the pthreads
 API, however it is possible with the underlying futex system call.

      

This change re-implements std::condition_variable with a tweaked
 version of the implementation of pthread_cond_* from Android bionic to
 support the correct semantics.

      

Bug: 35756266


https://reviews.llvm.org/D36767

Files:
  include/__mutex_base
  src/condition_variable.cpp

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