diff options
Diffstat (limited to 'absl/synchronization/mutex_test.cc')
-rw-r--r-- | absl/synchronization/mutex_test.cc | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/absl/synchronization/mutex_test.cc b/absl/synchronization/mutex_test.cc index 66d5f2aa..058f757b 100644 --- a/absl/synchronization/mutex_test.cc +++ b/absl/synchronization/mutex_test.cc @@ -707,6 +707,40 @@ TEST(Mutex, LockWhen) { t.join(); } +TEST(Mutex, LockWhenGuard) { + absl::Mutex mu; + int n = 30; + bool done = false; + + // We don't inline the lambda because the conversion is ambiguous in MSVC. + bool (*cond_eq_10)(int *) = [](int *p) { return *p == 10; }; + bool (*cond_lt_10)(int *) = [](int *p) { return *p < 10; }; + + std::thread t1([&mu, &n, &done, cond_eq_10]() { + absl::ReaderMutexLock lock(&mu, absl::Condition(cond_eq_10, &n)); + done = true; + }); + + std::thread t2[10]; + for (std::thread &t : t2) { + t = std::thread([&mu, &n, cond_lt_10]() { + absl::WriterMutexLock lock(&mu, absl::Condition(cond_lt_10, &n)); + ++n; + }); + } + + { + absl::MutexLock lock(&mu); + n = 0; + } + + for (std::thread &t : t2) t.join(); + t1.join(); + + EXPECT_TRUE(done); + EXPECT_EQ(n, 10); +} + // -------------------------------------------------------- // The following test requires Mutex::ReaderLock to be a real shared // lock, which is not the case in all builds. |