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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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3
lib/Support/ManagedStatic.cpp
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@ -13,7 +13,6 @@
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Config/config.h"
#include "llvm/Support/Atomic.h"
#include <cassert>
using namespace llvm;
@ -28,7 +27,7 @@ void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
void* tmp = Creator ? Creator() : 0;
TsanHappensBefore(this);
sys::MemoryFence();
std::atomic_thread_fence(std::memory_order_seq_cst);
// This write is racy against the first read in the ManagedStatic
// accessors. The race is benign because it does a second read after a