From 906727dcfeb359acec4caca3ba8c756c4308ff6b Mon Sep 17 00:00:00 2001
From: Duncan Sands <baldrick@free.fr>
Date: Sun, 17 Feb 2013 16:35:51 +0000
Subject: [PATCH] Add multithreading functions and shutdown to the C API. 
 Patch by Moritz Maxeiner.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175398 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm-c/Core.h | 33 +++++++++++++++++++++++++++++++++
 lib/IR/Core.cpp       | 20 ++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/include/llvm-c/Core.h b/include/llvm-c/Core.h
index c2445cd0704..e85fb975050 100644
--- a/include/llvm-c/Core.h
+++ b/include/llvm-c/Core.h
@@ -358,6 +358,11 @@ typedef enum {
 
 void LLVMInitializeCore(LLVMPassRegistryRef R);
 
+/** Deallocate and destroy all ManagedStatic variables.
+    @see llvm::llvm_shutdown
+    @see ManagedStatic */
+void LLVMShutdown();
+
 
 /*===-- Error handling ----------------------------------------------------===*/
 
@@ -2627,6 +2632,34 @@ void LLVMDisposePassManager(LLVMPassManagerRef PM);
  */
 
 /**
+ * @defgroup LLVMCCoreThreading Threading
+ *
+ * Handle the structures needed to make LLVM safe for multithreading.
+ *
+ * @{
+ */
+
+/** Allocate and initialize structures needed to make LLVM safe for
+    multithreading. The return value indicates whether multithreaded
+    initialization succeeded. Must be executed in isolation from all
+    other LLVM api calls.
+    @see llvm::llvm_start_multithreaded */
+LLVMBool LLVMStartMultithreaded();
+
+/** Deallocate structures necessary to make LLVM safe for multithreading.
+    Must be executed in isolation from all other LLVM api calls.
+    @see llvm::llvm_stop_multithreaded */
+void LLVMStopMultithreaded();
+
+/** Check whether LLVM is executing in thread-safe mode or not.
+    @see llvm::llvm_is_multithreaded */
+LLVMBool LLVMIsMultithreaded();
+
+/**
+ * @}
+ */
+
+/**
  * @}
  */
 
diff --git a/lib/IR/Core.cpp b/lib/IR/Core.cpp
index 79eb269206f..983b49c628b 100644
--- a/lib/IR/Core.cpp
+++ b/lib/IR/Core.cpp
@@ -26,9 +26,11 @@
 #include "llvm/Support/CallSite.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/system_error.h"
+#include "llvm/Support/Threading.h"
 #include <cassert>
 #include <cstdlib>
 #include <cstring>
@@ -48,6 +50,10 @@ void LLVMInitializeCore(LLVMPassRegistryRef R) {
   initializeCore(*unwrap(R));
 }
 
+void LLVMShutdown() {
+  llvm_shutdown();
+}
+
 /*===-- Error handling ----------------------------------------------------===*/
 
 void LLVMDisposeMessage(char *Message) {
@@ -2436,3 +2442,17 @@ LLVMBool LLVMFinalizeFunctionPassManager(LLVMPassManagerRef FPM) {
 void LLVMDisposePassManager(LLVMPassManagerRef PM) {
   delete unwrap(PM);
 }
+
+/*===-- Threading ------------------------------------------------------===*/
+
+LLVMBool LLVMStartMultithreaded() {
+  return llvm_start_multithreaded();
+}
+
+void LLVMStopMultithreaded() {
+  llvm_stop_multithreaded();
+}
+
+LLVMBool LLVMIsMultithreaded() {
+  return llvm_is_multithreaded();
+}
-- 
2.11.0