From 92ec8e1427e595d540f2238c7a1bb05fbd013013 Mon Sep 17 00:00:00 2001
From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Mon, 19 Sep 2011 07:41:43 +0000
Subject: [PATCH] Add Win32 support to llvm::llvm_execute_on_thread(). Thanks
 to Aaron Ballman!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140011 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Support/Threading.cpp | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/lib/Support/Threading.cpp b/lib/Support/Threading.cpp
index 29579567ac6..bf432a9af71 100644
--- a/lib/Support/Threading.cpp
+++ b/lib/Support/Threading.cpp
@@ -102,11 +102,42 @@ void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
  error:
   ::pthread_attr_destroy(&Attr);
 }
+#elif defined(LLVM_MULTITHREADED) && defined(LLVM_ON_WIN32)
+#include "Windows/Windows.h"
+#include <process.h>
 
+struct ThreadInfo {
+  void (*func)(void*);
+  void *param;
+};
+
+static unsigned __stdcall ThreadCallback(void *param) {
+  struct ThreadInfo *info = reinterpret_cast<struct ThreadInfo *>(param);
+  info->func(info->param);
+
+  return 0;
+}
+
+void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
+                                  unsigned RequestedStackSize) {
+  struct ThreadInfo param = { Fn, UserData };
+
+  HANDLE hThread = (HANDLE)::_beginthreadex(NULL,
+                                            RequestedStackSize, ThreadCallback,
+                                            &param, 0, NULL);
+
+  if (hThread) {
+    // We actually don't care whether the wait succeeds or fails, in
+    // the same way we don't care whether the pthread_join call succeeds
+    // or fails.  There's not much we could do if this were to fail. But
+    // on success, this call will wait until the thread finishes executing
+    // before returning.
+    (void)::WaitForSingleObject(hThread, INFINITE);
+    ::CloseHandle(hThread);
+  }
+}
 #else
-
-// No non-pthread implementation, currently.
-
+// Support for non-Win32, non-pthread implementation.
 void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
                                   unsigned RequestedStackSize) {
   (void) RequestedStackSize;