#include "llvm/Support/ManagedStatic.h"
#include "llvm/Config/config.h"
-#include "llvm/System/Atomic.h"
-#include "llvm/System/Mutex.h"
+#include "llvm/Support/Atomic.h"
#include <cassert>
using namespace llvm;
static const ManagedStaticBase *StaticList = 0;
-static sys::Mutex* ManagedStaticMutex = 0;
-
void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
void (*Deleter)(void*)) const {
- if (ManagedStaticMutex) {
- ManagedStaticMutex->acquire();
+ if (llvm_is_multithreaded()) {
+ llvm_acquire_global_lock();
if (Ptr == 0) {
void* tmp = Creator ? Creator() : 0;
+ TsanHappensBefore(this);
sys::MemoryFence();
+
+ // This write is racy against the first read in the ManagedStatic
+ // accessors. The race is benign because it does a second read after a
+ // memory fence, at which point it isn't possible to get a partial value.
+ TsanIgnoreWritesBegin();
Ptr = tmp;
+ TsanIgnoreWritesEnd();
DeleterFn = Deleter;
// Add to list of managed statics.
StaticList = this;
}
- ManagedStaticMutex->release();
+ llvm_release_global_lock();
} else {
assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
- "Partially initialized ManagedStatic!?");
+ "Partially initialized ManagedStatic!?");
Ptr = Creator ? Creator() : 0;
DeleterFn = Deleter;
DeleterFn = 0;
}
-void llvm::llvm_start_multithreaded() {
-#if LLVM_MULTITHREADED
- assert(ManagedStaticMutex == 0 && "Multithreaded LLVM already initialized!");
- ManagedStaticMutex = new sys::Mutex(true);
-#else
- assert(0 && "LLVM built without multithreading support!");
-#endif
-}
-
/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
void llvm::llvm_shutdown() {
while (StaticList)
StaticList->destroy();
- if (ManagedStaticMutex) {
- delete ManagedStaticMutex;
- ManagedStaticMutex = 0;
- }
+ if (llvm_is_multithreaded()) llvm_stop_multithreaded();
}
-