diff options
Diffstat (limited to 'absl/synchronization/mutex.cc')
-rw-r--r-- | absl/synchronization/mutex.cc | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/absl/synchronization/mutex.cc b/absl/synchronization/mutex.cc index 6ee5f235ac93..8cda5a1ce093 100644 --- a/absl/synchronization/mutex.cc +++ b/absl/synchronization/mutex.cc @@ -1439,20 +1439,18 @@ void Mutex::AssertNotHeld() const { // may spin for a short while if the lock cannot be acquired immediately. static bool TryAcquireWithSpinning(std::atomic<intptr_t>* mu) { int c = mutex_globals.spinloop_iterations; - int result = -1; // result of operation: 0=false, 1=true, -1=unknown - do { // do/while somewhat faster on AMD intptr_t v = mu->load(std::memory_order_relaxed); - if ((v & (kMuReader|kMuEvent)) != 0) { // a reader or tracing -> give up - result = 0; + if ((v & (kMuReader|kMuEvent)) != 0) { + return false; // a reader or tracing -> give up } else if (((v & kMuWriter) == 0) && // no holder -> try to acquire mu->compare_exchange_strong(v, kMuWriter | v, std::memory_order_acquire, std::memory_order_relaxed)) { - result = 1; + return true; } - } while (result == -1 && --c > 0); - return result == 1; + } while (--c > 0); + return false; } ABSL_XRAY_LOG_ARGS(1) void Mutex::Lock() { |