include/llvm/Support/thread.h

   1 //===-- llvm/Support/thread.h - Wrapper for <thread> ------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This header is a wrapper for <thread> that works around problems with the
  10 // MSVC headers when exceptions are disabled. It also provides llvm::thread,
  11 // which is either a typedef of std::thread or a replacement that calls the
  12 // function synchronously depending on the value of LLVM_ENABLE_THREADS.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #ifndef LLVM_SUPPORT_THREAD_H
  17 #define LLVM_SUPPORT_THREAD_H
  18
  19 #include "llvm/Config/llvm-config.h"
  20
  21 #if LLVM_ENABLE_THREADS
  22
  23 #include <thread>
  24
  25 namespace llvm {
  26 typedef std::thread thread;
  27 }
  28
  29 #else // !LLVM_ENABLE_THREADS
  30
  31 #include <utility>
  32
  33 namespace llvm {
  34
  35 struct thread {
  36   thread() {}
  37   thread(thread &&other) {}
  38   template <class Function, class... Args>
  39   explicit thread(Function &&f, Args &&... args) {
  40     f(std::forward<Args>(args)...);
  41   }
  42   thread(const thread &) = delete;
  43
  44   void join() {}
  45   static unsigned hardware_concurrency() { return 1; };
  46 };
  47
  48 }
  49
  50 #endif // LLVM_ENABLE_THREADS
  51
  52 #endif