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[C++11] Replace LLVM atomics with std::atomic.
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
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@ -81,14 +81,14 @@ raw_ostream *llvm::CreateInfoOutputFile() {
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static TimerGroup *DefaultTimerGroup = 0;
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static TimerGroup *getDefaultTimerGroup() {
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TimerGroup *tmp = DefaultTimerGroup;
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sys::MemoryFence();
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std::atomic_thread_fence(std::memory_order_seq_cst);
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if (tmp) return tmp;
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llvm_acquire_global_lock();
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tmp = DefaultTimerGroup;
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if (!tmp) {
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tmp = new TimerGroup("Miscellaneous Ungrouped Timers");
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sys::MemoryFence();
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std::atomic_thread_fence(std::memory_order_seq_cst);
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DefaultTimerGroup = tmp;
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}
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llvm_release_global_lock();
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