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[C++11] Replace LLVM atomics with std::atomic.

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With C++11 we finally have a standardized way to specify atomic operations. Use
them to replace the existing custom implemention. Sadly the translation is not
entirely trivial as std::atomic allows more fine-grained control over the
atomicity. I tried to preserve the old semantics as well as possible.

Differential Revision: http://llvm-reviews.chandlerc.com/D2915

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202730 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2014-03-03 17:53:30 +00:00
parent 59a4517759
commit 4721e55a0c
9 changed files with 49 additions and 41 deletions
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14
include/llvm/Support/ManagedStatic.h
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@ -14,9 +14,9 @@
#ifndef LLVM_SUPPORT_MANAGED_STATIC_H
#define LLVM_SUPPORT_MANAGED_STATIC_H
#include "llvm/Support/Atomic.h"
#include "llvm/Support/Threading.h"
#include "llvm/Support/Valgrind.h"
#include <atomic>
namespace llvm {
@ -64,7 +64,8 @@ public:
// Accessors.
C &operator*() {
void* tmp = Ptr;
if (llvm_is_multithreaded()) sys::MemoryFence();
if (llvm_is_multithreaded())
std::atomic_thread_fence(std::memory_order_seq_cst);
if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
TsanHappensAfter(this);
@ -72,7 +73,8 @@ public:
}
C *operator->() {
void* tmp = Ptr;
if (llvm_is_multithreaded()) sys::MemoryFence();
if (llvm_is_multithreaded())
std::atomic_thread_fence(std::memory_order_seq_cst);
if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
TsanHappensAfter(this);
@ -80,7 +82,8 @@ public:
}
const C &operator*() const {
void* tmp = Ptr;
if (llvm_is_multithreaded()) sys::MemoryFence();
if (llvm_is_multithreaded())
std::atomic_thread_fence(std::memory_order_seq_cst);
if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
TsanHappensAfter(this);
@ -88,7 +91,8 @@ public:
}
const C *operator->() const {
void* tmp = Ptr;
if (llvm_is_multithreaded()) sys::MemoryFence();
if (llvm_is_multithreaded())
std::atomic_thread_fence(std::memory_order_seq_cst);
if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>::call);
TsanHappensAfter(this);