//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Chris Lattner and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/Atomic.h"
#include <cassert>
using namespace llvm;
static const ManagedStaticBase *StaticList = 0;
-void ManagedStaticBase::RegisterManagedStatic(void *ObjPtr,
+void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
void (*Deleter)(void*)) const {
- assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
- "Partially init static?");
- Ptr = ObjPtr;
- DeleterFn = Deleter;
+ 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.
+ Next = StaticList;
+ StaticList = this;
+ }
+
+ llvm_release_global_lock();
+ } else {
+ assert(Ptr == 0 && DeleterFn == 0 && Next == 0 &&
+ "Partially initialized ManagedStatic!?");
+ Ptr = Creator ? Creator() : 0;
+ DeleterFn = Deleter;
- // Add to list of managed statics.
- Next = StaticList;
- StaticList = this;
+ // Add to list of managed statics.
+ Next = StaticList;
+ StaticList = this;
+ }
}
void ManagedStaticBase::destroy() const {
void llvm::llvm_shutdown() {
while (StaticList)
StaticList->destroy();
-}
+ if (llvm_is_multithreaded()) llvm_stop_multithreaded();
+}