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Fix the MinGW builder. Apparently std::call_once and

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std::recursive_mutex are not available on MinGW and breaks the
builder.  Revert to using a function local static and sys::Mutex
just to get the tree green until we figure out a better solution.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211424 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Zachary Turner 2014-06-21 00:24:51 +00:00
parent 45fdc3d534
commit 9222a2375f
1 changed files with 10 additions and 17 deletions
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27
lib/Support/ManagedStatic.cpp
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@ -14,33 +14,26 @@
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Config/config.h"
#include "llvm/Support/Atomic.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.
static std::once_flag MutexInitializationFlag;
static std::recursive_mutex* ManagedStaticMutex = nullptr;
// Not all supported platforms (in particular VS2012) have thread-safe function
// static initialization, so roll our own.
static std::recursive_mutex& GetManagedStaticMutex() {
std::call_once(MutexInitializationFlag,
[]() { ManagedStaticMutex = new std::recursive_mutex(); } );
return *ManagedStaticMutex;
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()) {
std::lock_guard<std::recursive_mutex> Lock(GetManagedStaticMutex());
MutexGuard Lock(getManagedStaticMutex());
if (!Ptr) {
void* tmp = Creator();
@ -90,7 +83,7 @@ void ManagedStaticBase::destroy() const {
/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
void llvm::llvm_shutdown() {
std::lock_guard<std::recursive_mutex> Lock(GetManagedStaticMutex());
MutexGuard Lock(getManagedStaticMutex());
while (StaticList)
StaticList->destroy();