#include "llvm/Support/ManagedStatic.h"
#include "llvm/Config/config.h"
#include "llvm/Support/Atomic.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Mutex.h"
#include "llvm/Support/MutexGuard.h"
#include <cassert>
-#include <mutex>
using namespace llvm;
static const ManagedStaticBase *StaticList = nullptr;
-// ManagedStatics can get created during execution of static constructors. As a
-// result, we cannot use a global static std::mutex object for the lock since it
-// may not have been constructed. Instead, we do a call-once initialization of
-// a pointer to a mutex. This also means that we must not "initialize" the
-// mutex with nullptr, otherwise it might get reset to nullptr after being
-// initialized by std::call_once.
-static std::once_flag MutexInitializationFlag;
-static std::recursive_mutex *ManagedStaticMutex;
-
-namespace {
- void InitializeManagedStaticMutex() {
- std::call_once(MutexInitializationFlag,
- []() { ManagedStaticMutex = new std::recursive_mutex(); });
- }
+static sys::Mutex& getManagedStaticMutex() {
+ // We need to use a function local static here, since this can get called
+ // during a static constructor and we need to guarantee that it's initialized
+ // correctly.
+ static sys::Mutex ManagedStaticMutex;
+ return ManagedStaticMutex;
}
void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
void (*Deleter)(void*)) const {
assert(Creator);
if (llvm_is_multithreaded()) {
- InitializeManagedStaticMutex();
+ MutexGuard Lock(getManagedStaticMutex());
- std::lock_guard<std::recursive_mutex> Lock(*ManagedStaticMutex);
if (!Ptr) {
void* tmp = Creator();
/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
void llvm::llvm_shutdown() {
- InitializeManagedStaticMutex();
- std::lock_guard<std::recursive_mutex> Lock(*ManagedStaticMutex);
+ MutexGuard Lock(getManagedStaticMutex());
while (StaticList)
StaticList->destroy();