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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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21
include/llvm/Support/Threading.h
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@@ -7,8 +7,7 @@
//
//===----------------------------------------------------------------------===//
//
// This file declares helper functions for running LLVM in a multi-threaded
// environment.
// TThis file defines llvm_start_multithreaded() and friends.
//
//===----------------------------------------------------------------------===//
@@ -16,8 +15,22 @@
#define LLVM_SUPPORT_THREADING_H
namespace llvm {
/// Returns true if LLVM is compiled with support for multi-threading, and
/// false otherwise.
/// llvm_start_multithreaded - Allocate and initialize structures needed to
/// make LLVM safe for multithreading. The return value indicates whether
/// multithreaded initialization succeeded. LLVM will still be operational
/// on "failed" return, and will still be safe for hosting threading
/// applications in the JIT, but will not be safe for concurrent calls to the
/// LLVM APIs.
/// THIS MUST EXECUTE IN ISOLATION FROM ALL OTHER LLVM API CALLS.
bool llvm_start_multithreaded();
/// llvm_stop_multithreaded - Deallocate structures necessary to make LLVM
/// safe for multithreading.
/// THIS MUST EXECUTE IN ISOLATION FROM ALL OTHER LLVM API CALLS.
void llvm_stop_multithreaded();
/// llvm_is_multithreaded - Check whether LLVM is executing in thread-safe
/// mode or not.
bool llvm_is_multithreaded();
/// llvm_execute_on_thread - Execute the given \p UserFn on a separate