white space cleanups

[oota-llvm.git] / lib / Support / Threading.cpp

diff --git a/lib/Support/Threading.cpp b/lib/Support/Threading.cpp
index a5876487e055890fcd0436f5137bb7c3c7ed1239..29579567ac6c19f7f919a5f8039f9efc23bddfe6 100644 (file)
--- a/lib/Support/Threading.cpp
+++ b/lib/Support/Threading.cpp
@@ -12,8 +12,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/Threading.h"
-#include "llvm/System/Atomic.h"
-#include "llvm/System/Mutex.h"
+#include "llvm/Support/Atomic.h"
+#include "llvm/Support/Mutex.h"
+#include "llvm/Config/config.h"
 #include <cassert>
 
 using namespace llvm;
@@ -27,7 +28,7 @@ bool llvm::llvm_start_multithreaded() {
   assert(!multithreaded_mode && "Already multithreaded!");
   multithreaded_mode = true;
   global_lock = new sys::Mutex(true);
-  
+
   // We fence here to ensure that all initialization is complete BEFORE we
   // return from llvm_start_multithreaded().
   sys::MemoryFence();
@@ -40,11 +41,11 @@ bool llvm::llvm_start_multithreaded() {
 void llvm::llvm_stop_multithreaded() {
 #ifdef LLVM_MULTITHREADED
   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;
   delete global_lock;
 #endif
@@ -60,4 +61,56 @@ void llvm::llvm_acquire_global_lock() {
 
 void llvm::llvm_release_global_lock() {
   if (multithreaded_mode) global_lock->release();
-}
\ No newline at end of file
+}
+
+#if defined(LLVM_MULTITHREADED) && defined(HAVE_PTHREAD_H)
+#include <pthread.h>
+
+struct ThreadInfo {
+  void (*UserFn)(void *);
+  void *UserData;
+};
+static void *ExecuteOnThread_Dispatch(void *Arg) {
+  ThreadInfo *TI = reinterpret_cast<ThreadInfo*>(Arg);
+  TI->UserFn(TI->UserData);
+  return 0;
+}
+
+void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
+                                  unsigned RequestedStackSize) {
+  ThreadInfo Info = { Fn, UserData };
+  pthread_attr_t Attr;
+  pthread_t Thread;
+
+  // Construct the attributes object.
+  if (::pthread_attr_init(&Attr) != 0)
+    return;
+
+  // Set the requested stack size, if given.
+  if (RequestedStackSize != 0) {
+    if (::pthread_attr_setstacksize(&Attr, RequestedStackSize) != 0)
+      goto error;
+  }
+
+  // Construct and execute the thread.
+  if (::pthread_create(&Thread, &Attr, ExecuteOnThread_Dispatch, &Info) != 0)
+    goto error;
+
+  // Wait for the thread and clean up.
+  ::pthread_join(Thread, 0);
+
+ error:
+  ::pthread_attr_destroy(&Attr);
+}
+
+#else
+
+// No non-pthread implementation, currently.
+
+void llvm::llvm_execute_on_thread(void (*Fn)(void*), void *UserData,
+                                  unsigned RequestedStackSize) {
+  (void) RequestedStackSize;
+  Fn(UserData);
+}
+
+#endif