Add a C++11 ThreadPool implementation in LLVM

[oota-llvm.git] / include / llvm / Support / thread.h

diff --git a/include/llvm/Support/thread.h b/include/llvm/Support/thread.h
index b61177d59891bb8a33f9ffd1b4ba59a2f89862ab..2d130418a57fd7b79dec5ecaccf5a25f83c56264 100644 (file)
--- a/include/llvm/Support/thread.h
+++ b/include/llvm/Support/thread.h
@@ -8,13 +8,19 @@
 //===----------------------------------------------------------------------===//
 //
 // This header is a wrapper for <thread> that works around problems with the
-// MSVC headers when exceptions are disabled.
+// MSVC headers when exceptions are disabled. It also provides llvm::thread,
+// which is either a typedef of std::thread or a replacement that calls the
+// function synchronously depending on the value of LLVM_ENABLE_THREADS.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_SUPPORT_THREAD_H
 #define LLVM_SUPPORT_THREAD_H
 
+#include "llvm/Config/llvm-config.h"
+
+#if LLVM_ENABLE_THREADS
+
 #ifdef _MSC_VER
 // concrt.h depends on eh.h for __uncaught_exception declaration
 // even if we disable exceptions.
@@ -31,4 +37,30 @@
 #pragma warning(pop)
 #endif
 
+namespace llvm {
+typedef std::thread thread;
+}
+
+#else // !LLVM_ENABLE_THREADS
+
+#include <utility>
+
+namespace llvm {
+
+struct thread {
+  thread() {}
+  thread(thread &&other) {}
+  template <class Function, class... Args>
+  explicit thread(Function &&f, Args &&... args) {
+    f(std::forward<Args>(args)...);
+  }
+  thread(const thread &) = delete;
+
+  void join() {}
+};
+
+}
+
+#endif // LLVM_ENABLE_THREADS
+
 #endif