//===----------------------------------------------------------------------===//
//
// 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.
#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