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Removing the static initializer in ManagedStatic.cpp by using llvm_call_once to initialize the ManagedStatic mutex.

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Summary:
This patch adds an llvm_call_once which is a wrapper around std::call_once on platforms where it is available and devoid of bugs. The patch also migrates the ManagedStatic mutex to be allocated using llvm_call_once.

These changes are philosophically equivalent to the changes added in r219638, which were reverted due to a hang on Win32 which was the result of a bug in the Windows implementation of std::call_once.

Reviewers: aaron.ballman, chapuni, chandlerc, rnk

Reviewed By: rnk

Subscribers: majnemer, llvm-commits

Differential Revision: http://reviews.llvm.org/D5922

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220932 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Bieneman
2014-10-30 22:07:09 +00:00
parent 76ebe3d35c
commit 8744520b53
6 changed files with 81 additions and 4 deletions
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7
lib/Support/Threading.cpp
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@ -110,3 +110,10 @@ void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
}
#endif
#if defined(LLVM_ON_UNIX)
#include "Unix/Threading.inc"
#else
#include "Windows/Threading.inc"
#endif