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-rw-r--r--absl/synchronization/mutex.cc11
1 files changed, 8 insertions, 3 deletions
diff --git a/absl/synchronization/mutex.cc b/absl/synchronization/mutex.cc
index dd771421..ddd8fb8d 100644
--- a/absl/synchronization/mutex.cc
+++ b/absl/synchronization/mutex.cc
@@ -591,10 +591,15 @@ static SynchLocksHeld *Synch_GetAllLocks() {
void Mutex::IncrementSynchSem(Mutex *mu, PerThreadSynch *w) {
if (mu) {
ABSL_TSAN_MUTEX_PRE_DIVERT(mu, 0);
- }
- PerThreadSem::Post(w->thread_identity());
- if (mu) {
+ // We miss synchronization around passing PerThreadSynch between threads
+ // since it happens inside of the Mutex code, so we need to ignore all
+ // accesses to the object.
+ ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_BEGIN();
+ PerThreadSem::Post(w->thread_identity());
+ ABSL_ANNOTATE_IGNORE_READS_AND_WRITES_END();
ABSL_TSAN_MUTEX_POST_DIVERT(mu, 0);
+ } else {
+ PerThreadSem::Post(w->thread_identity());
}
}