Users of the llvm global mutex must now acquire it manually.

This allows the mutex to be acquired in a guarded, RAII fashion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211066 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 8 insertions, 9 deletions

diff --git a/include/llvm/Support/Mutex.h b/include/llvm/Support/Mutex.h
index 496a4381f3..2f3201a201 100644
--- a/include/llvm/Support/Mutex.h
+++ b/include/llvm/Support/Mutex.h
@@ -15,11 +15,13 @@
 #define LLVM_SUPPORT_MUTEX_H
 
 #include "llvm/Support/Compiler.h"
-#include "llvm/Support/Threading.h"
 #include <cassert>
 
 namespace llvm
 {
+  // Forward declare.
+  bool llvm_is_multithreaded();
+
   namespace sys
   {
     /// @brief Platform agnostic Mutex class.
diff --git a/include/llvm/Support/Threading.h b/include/llvm/Support/Threading.h
index a7e8774558..4768d86de9 100644
--- a/include/llvm/Support/Threading.h
+++ b/include/llvm/Support/Threading.h
@@ -14,7 +14,12 @@
 #ifndef LLVM_SUPPORT_THREADING_H
 #define LLVM_SUPPORT_THREADING_H
 
+#include "llvm/Support/Mutex.h"
+
 namespace llvm {
+  /// llvm_get_global_lock - returns the llvm global lock object.
+  sys::Mutex& llvm_get_global_lock();
+
   /// 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
@@ -33,14 +38,6 @@ namespace llvm {
   /// mode or not.
   bool llvm_is_multithreaded();
 
-  /// acquire_global_lock - Acquire the global lock.  This is a no-op if called
-  /// before llvm_start_multithreaded().
-  void llvm_acquire_global_lock();
-
-  /// release_global_lock - Release the global lock.  This is a no-op if called
-  /// before llvm_start_multithreaded().
-  void llvm_release_global_lock();
-
   /// llvm_execute_on_thread - Execute the given \p UserFn on a separate
   /// thread, passing it the provided \p UserData.
   ///