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-rw-r--r--base/synchronization/condition_variable_posix.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/base/synchronization/condition_variable_posix.cc b/base/synchronization/condition_variable_posix.cc
index d86fd180ec..d07c671810 100644
--- a/base/synchronization/condition_variable_posix.cc
+++ b/base/synchronization/condition_variable_posix.cc
@@ -118,6 +118,8 @@ void ConditionVariable::TimedWait(const TimeDelta& max_time) {
#endif // OS_ANDROID && HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC
#endif // OS_MACOSX
+ // On failure, we only expect the CV to timeout. Any other error value means
+ // that we've unexpectedly woken up.
DCHECK(rv == 0 || rv == ETIMEDOUT);
#if DCHECK_IS_ON()
user_lock_->CheckUnheldAndMark();