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Revert r211287, "Remove support for LLVM runtime multi-threading."

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libclang still requires it on cygming, lack of incomplete <mutex>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211592 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi
2014-06-24 13:36:31 +00:00
parent 90be077d09
commit cdde33ebaa
7 changed files with 99 additions and 17 deletions
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29
lib/Support/Threading.cpp
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@ -7,8 +7,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file defines helper functions for running LLVM in a multi-threaded
// environment.
// This file implements llvm_start_multithreaded() and friends.
//
//===----------------------------------------------------------------------===//
@ -20,14 +19,38 @@
using namespace llvm;
bool llvm::llvm_is_multithreaded() {
static bool multithreaded_mode = false;
bool llvm::llvm_start_multithreaded() {
#if LLVM_ENABLE_THREADS != 0
assert(!multithreaded_mode && "Already multithreaded!");
multithreaded_mode = true;
// We fence here to ensure that all initialization is complete BEFORE we
// return from llvm_start_multithreaded().
sys::MemoryFence();
return true;
#else
return false;
#endif
}
void llvm::llvm_stop_multithreaded() {
#if LLVM_ENABLE_THREADS != 0
assert(multithreaded_mode && "Not currently multithreaded!");
// We fence here to insure that all threaded operations are complete BEFORE we
// return from llvm_stop_multithreaded().
sys::MemoryFence();
multithreaded_mode = false;
#endif
}
bool llvm::llvm_is_multithreaded() {
return multithreaded_mode;
}
#if LLVM_ENABLE_THREADS != 0 && defined(HAVE_PTHREAD_H)
#include <pthread.h>