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-rw-r--r--absl/synchronization/CMakeLists.txt268
-rw-r--r--absl/synchronization/internal/mutex_nonprod.inc3
-rw-r--r--absl/synchronization/lifetime_test.cc48
-rw-r--r--absl/synchronization/mutex.h22
4 files changed, 227 insertions, 114 deletions
diff --git a/absl/synchronization/CMakeLists.txt b/absl/synchronization/CMakeLists.txt
index de0d7b7d..cb77b685 100644
--- a/absl/synchronization/CMakeLists.txt
+++ b/absl/synchronization/CMakeLists.txt
@@ -14,142 +14,182 @@
# limitations under the License.
#
-list(APPEND SYNCHRONIZATION_PUBLIC_HEADERS
- "barrier.h"
- "blocking_counter.h"
- "mutex.h"
- "notification.h"
+absl_cc_library(
+ NAME
+ graphcycles_internal
+ HDRS
+ "internal/graphcycles.h"
+ SRCS
+ "internal/graphcycles.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::base
+ absl::base_internal
+ absl::core_headers
+ absl::malloc_internal
)
-
-list(APPEND SYNCHRONIZATION_INTERNAL_HEADERS
- "internal/create_thread_identity.h"
- "internal/graphcycles.h"
- "internal/kernel_timeout.h"
- "internal/per_thread_sem.h"
- "internal/thread_pool.h"
- "internal/waiter.h"
-)
-
-
-
-# synchronization library
-list(APPEND SYNCHRONIZATION_SRC
- "barrier.cc"
- "blocking_counter.cc"
- "internal/create_thread_identity.cc"
- "internal/per_thread_sem.cc"
- "internal/waiter.cc"
- "internal/graphcycles.cc"
- "notification.cc"
- "mutex.cc"
-)
-
-set(SYNCHRONIZATION_PUBLIC_LIBRARIES absl::base absl::stacktrace absl::symbolize absl::time)
-
-absl_library(
- TARGET
- absl_synchronization
- SOURCES
- ${SYNCHRONIZATION_SRC}
- PUBLIC_LIBRARIES
- ${SYNCHRONIZATION_PUBLIC_LIBRARIES}
- EXPORT_NAME
+absl_cc_library(
+ NAME
synchronization
+ HDRS
+ "barrier.h"
+ "blocking_counter.h"
+ "internal/create_thread_identity.h"
+ "internal/kernel_timeout.h"
+ "internal/mutex_nonprod.inc"
+ "internal/per_thread_sem.h"
+ "internal/waiter.h"
+ "mutex.h"
+ "notification.h"
+ SRCS
+ "barrier.cc"
+ "blocking_counter.cc"
+ "internal/create_thread_identity.cc"
+ "internal/per_thread_sem.cc"
+ "internal/waiter.cc"
+ "notification.cc"
+ "mutex.cc"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ DEPS
+ absl::graphcycles_internal
+ absl::base
+ absl::base_internal
+ absl::config
+ absl::core_headers
+ absl::dynamic_annotations
+ absl::malloc_internal
+ absl::stacktrace
+ absl::symbolize
+ absl::time
+ PUBLIC
)
-
-#
-## TESTS
-#
-
-
-# test barrier_test
-set(BARRIER_TEST_SRC "barrier_test.cc")
-set(BARRIER_TEST_PUBLIC_LIBRARIES absl::synchronization)
-
-absl_test(
- TARGET
+absl_cc_test(
+ NAME
barrier_test
- SOURCES
- ${BARRIER_TEST_SRC}
- PUBLIC_LIBRARIES
- ${BARRIER_TEST_PUBLIC_LIBRARIES}
+ SRCS
+ "barrier_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::time
+ gmock_main
)
-
-# test blocking_counter_test
-set(BLOCKING_COUNTER_TEST_SRC "blocking_counter_test.cc")
-set(BLOCKING_COUNTER_TEST_PUBLIC_LIBRARIES absl::synchronization)
-
-absl_test(
- TARGET
+absl_cc_test(
+ NAME
blocking_counter_test
- SOURCES
- ${BLOCKING_COUNTER_TEST_SRC}
- PUBLIC_LIBRARIES
- ${BLOCKING_COUNTER_TEST_PUBLIC_LIBRARIES}
+ SRCS
+ "blocking_counter_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::time
+ gmock_main
)
-
-# test graphcycles_test
-set(GRAPHCYCLES_TEST_SRC "internal/graphcycles_test.cc")
-set(GRAPHCYCLES_TEST_PUBLIC_LIBRARIES absl::synchronization)
-
-absl_test(
- TARGET
+absl_cc_test(
+ NAME
graphcycles_test
- SOURCES
- ${GRAPHCYCLES_TEST_SRC}
- PUBLIC_LIBRARIES
- ${GRAPHCYCLES_TEST_PUBLIC_LIBRARIES}
+ SRCS
+ "internal/graphcycles_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::graphcycles_internal
+ absl::base
+ absl::core_headers
+ gmock_main
)
+absl_cc_library(
+ NAME
+ thread_pool
+ HDRS
+ "internal/thread_pool.h"
+ DEPS
+ absl::synchronization
+ absl::core_headers
+ TESTONLY
+)
-# test mutex_test
-set(MUTEX_TEST_SRC "mutex_test.cc")
-set(MUTEX_TEST_PUBLIC_LIBRARIES absl::synchronization)
-
-absl_test(
- TARGET
+absl_cc_test(
+ NAME
mutex_test
- SOURCES
- ${MUTEX_TEST_SRC}
- PUBLIC_LIBRARIES
- ${MUTEX_TEST_PUBLIC_LIBRARIES}
+ SRCS
+ "mutex_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::thread_pool
+ absl::base
+ absl::core_headers
+ absl::memory
+ absl::time
+ gmock_main
)
-
-# test notification_test
-set(NOTIFICATION_TEST_SRC "notification_test.cc")
-set(NOTIFICATION_TEST_PUBLIC_LIBRARIES absl::synchronization)
-
-absl_test(
- TARGET
+absl_cc_test(
+ NAME
notification_test
- SOURCES
- ${NOTIFICATION_TEST_SRC}
- PUBLIC_LIBRARIES
- ${NOTIFICATION_TEST_PUBLIC_LIBRARIES}
+ SRCS
+ "notification_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::time
+ gmock_main
)
-
-# test per_thread_sem_test_common
-set(PER_THREAD_SEM_TEST_COMMON_SRC "internal/per_thread_sem_test.cc")
-set(PER_THREAD_SEM_TEST_COMMON_PUBLIC_LIBRARIES absl::synchronization absl::strings)
-
-absl_test(
- TARGET
+absl_cc_library(
+ NAME
per_thread_sem_test_common
- SOURCES
- ${PER_THREAD_SEM_TEST_COMMON_SRC}
- PUBLIC_LIBRARIES
- ${PER_THREAD_SEM_TEST_COMMON_PUBLIC_LIBRARIES}
+ SRCS
+ "internal/per_thread_sem_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::base
+ absl::strings
+ absl::time
+ gmock
+ TESTONLY
)
+absl_cc_test(
+ NAME
+ per_thread_sem_test
+ SRCS
+ "internal/per_thread_sem_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::per_thread_sem_test_common
+ absl::synchronization
+ absl::base
+ absl::strings
+ absl::time
+ gmock_main
+)
-
-
-
-
-
+absl_cc_test(
+ NAME
+ lifetime_test
+ SRCS
+ "lifetime_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::synchronization
+ absl::base
+ absl::core_headers
+ Threads::Threads
+)
diff --git a/absl/synchronization/internal/mutex_nonprod.inc b/absl/synchronization/internal/mutex_nonprod.inc
index 0aab3d13..b8d5af79 100644
--- a/absl/synchronization/internal/mutex_nonprod.inc
+++ b/absl/synchronization/internal/mutex_nonprod.inc
@@ -214,6 +214,9 @@ class SynchronizationStorage {
// stack) should use this constructor.
explicit SynchronizationStorage(base_internal::LinkerInitialized) {}
+ constexpr explicit SynchronizationStorage(absl::ConstInitType)
+ : is_dynamic_(false), once_(), space_{{0}} {}
+
SynchronizationStorage(SynchronizationStorage&) = delete;
SynchronizationStorage& operator=(SynchronizationStorage&) = delete;
diff --git a/absl/synchronization/lifetime_test.cc b/absl/synchronization/lifetime_test.cc
index b7360c29..8b168e21 100644
--- a/absl/synchronization/lifetime_test.cc
+++ b/absl/synchronization/lifetime_test.cc
@@ -17,6 +17,7 @@
#include <type_traits>
#include "absl/base/attributes.h"
+#include "absl/base/const_init.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/base/thread_annotations.h"
#include "absl/synchronization/mutex.h"
@@ -95,6 +96,10 @@ void TestLocals() {
RunTests(&mutex, &condvar);
}
+// Normal kConstInit usage
+ABSL_CONST_INIT absl::Mutex const_init_mutex(absl::kConstInit);
+void TestConstInitGlobal() { RunTests(&const_init_mutex, nullptr); }
+
// Global variables during start and termination
//
// In a translation unit, static storage duration variables are initialized in
@@ -117,10 +122,53 @@ class OnDestruction {
Function fn_;
};
+// kConstInit
+// Test early usage. (Declaration comes first; definitions must appear after
+// the test runner.)
+extern absl::Mutex early_const_init_mutex;
+// (Normally I'd write this +[], to make the cast-to-function-pointer explicit,
+// but in some MSVC setups we support, lambdas provide conversion operators to
+// different flavors of function pointers, making this trick ambiguous.)
+OnConstruction test_early_const_init([] {
+ RunTests(&early_const_init_mutex, nullptr);
+});
+// This definition appears before test_early_const_init, but it should be
+// initialized first (due to constant initialization). Test that the object
+// actually works when constructed this way.
+ABSL_CONST_INIT absl::Mutex early_const_init_mutex(absl::kConstInit);
+
+// Furthermore, test that the const-init c'tor doesn't stomp over the state of
+// a Mutex. Really, this is a test that the platform under test correctly
+// supports C++11 constant initialization. (The constant-initialization
+// constructors of globals "happen at link time"; memory is pre-initialized,
+// before the constructors of either grab_lock or check_still_locked are run.)
+extern absl::Mutex const_init_sanity_mutex;
+OnConstruction grab_lock([]() NO_THREAD_SAFETY_ANALYSIS {
+ const_init_sanity_mutex.Lock();
+});
+ABSL_CONST_INIT absl::Mutex const_init_sanity_mutex(absl::kConstInit);
+OnConstruction check_still_locked([]() NO_THREAD_SAFETY_ANALYSIS {
+ const_init_sanity_mutex.AssertHeld();
+ const_init_sanity_mutex.Unlock();
+});
+
+// Test shutdown usage. (Declarations come first; definitions must appear after
+// the test runner.)
+extern absl::Mutex late_const_init_mutex;
+// OnDestruction is being used here as a global variable, even though it has a
+// non-trivial destructor. This is against the style guide. We're violating
+// that rule here to check that the exception we allow for kConstInit is safe.
+// NOLINTNEXTLINE
+OnDestruction test_late_const_init([] {
+ RunTests(&late_const_init_mutex, nullptr);
+});
+ABSL_CONST_INIT absl::Mutex late_const_init_mutex(absl::kConstInit);
+
} // namespace
int main() {
TestLocals();
+ TestConstInitGlobal();
// Explicitly call exit(0) here, to make it clear that we intend for the
// above global object destructors to run.
std::exit(0);
diff --git a/absl/synchronization/mutex.h b/absl/synchronization/mutex.h
index aeef3c95..4b65e92c 100644
--- a/absl/synchronization/mutex.h
+++ b/absl/synchronization/mutex.h
@@ -61,6 +61,7 @@
#include <cstdint>
#include <string>
+#include "absl/base/const_init.h"
#include "absl/base/internal/identity.h"
#include "absl/base/internal/low_level_alloc.h"
#include "absl/base/internal/thread_identity.h"
@@ -136,7 +137,26 @@ struct SynchWaitParams;
class LOCKABLE Mutex {
public:
+ // Creates a `Mutex` that is not held by anyone. This constructor is
+ // typically used for Mutexes allocated on the heap or the stack.
+ //
+ // To create `Mutex` instances with static storage duration
+ // (e.g. a namespace-scoped or global variable), see
+ // `Mutex::Mutex(absl::kConstInit)` below instead.
Mutex();
+
+ // Creates a mutex with static storage duration. A global variable
+ // constructed this way avoids the lifetime issues that can occur on program
+ // startup and shutdown. (See absl/base/const_init.h.)
+ //
+ // For Mutexes allocated on the heap and stack, instead use the default
+ // constructor, which can interact more fully with the thread sanitizer.
+ //
+ // Example usage:
+ // namespace foo {
+ // ABSL_CONST_INIT Mutex mu(absl::kConstInit);
+ // }
+ explicit constexpr Mutex(absl::ConstInitType);
~Mutex();
// Mutex::Lock()
@@ -879,10 +899,12 @@ class SCOPED_LOCKABLE ReleasableMutexLock {
};
#ifdef ABSL_INTERNAL_USE_NONPROD_MUTEX
+inline constexpr Mutex::Mutex(absl::ConstInitType) : impl_(absl::kConstInit) {}
#else
inline Mutex::Mutex() : mu_(0) {
ABSL_TSAN_MUTEX_CREATE(this, __tsan_mutex_not_static);
}
+inline constexpr Mutex::Mutex(absl::ConstInitType) : mu_(0) {}
inline CondVar::CondVar() : cv_(0) {}
#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 02:32:58 +0000