1 //===-- llvm/Support/thread.h - Wrapper for <thread> ------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This header is a wrapper for <thread> that works around problems with the 11 // MSVC headers when exceptions are disabled. It also provides llvm::thread, 12 // which is either a typedef of std::thread or a replacement that calls the 13 // function synchronously depending on the value of LLVM_ENABLE_THREADS. 14 // 15 //===----------------------------------------------------------------------===// 16 17 #ifndef LLVM_SUPPORT_THREAD_H 18 #define LLVM_SUPPORT_THREAD_H 19 20 #include "llvm/Config/llvm-config.h" 21 22 #if LLVM_ENABLE_THREADS 23 24 #ifdef _MSC_VER 25 // concrt.h depends on eh.h for __uncaught_exception declaration 26 // even if we disable exceptions. 27 #include <eh.h> 28 29 // Suppress 'C++ exception handler used, but unwind semantics are not enabled.' 30 #pragma warning(push) 31 #pragma warning(disable:4530) 32 #endif 33 34 #include <thread> 35 36 #ifdef _MSC_VER 37 #pragma warning(pop) 38 #endif 39 40 namespace llvm { 41 typedef std::thread thread; 42 } 43 44 #else // !LLVM_ENABLE_THREADS 45 46 #include <utility> 47 48 namespace llvm { 49 50 struct thread { 51 thread() {} 52 thread(thread &&other) {} 53 template <class Function, class... Args> 54 explicit thread(Function &&f, Args &&... args) { 55 f(std::forward<Args>(args)...); 56 } 57 thread(const thread &) = delete; 58 59 void join() {} 60 static unsigned hardware_concurrency() { return 1; }; 61 }; 62 63 } 64 65 #endif // LLVM_ENABLE_THREADS 66 67 #endif 68
