361 lines
11 KiB
C++
361 lines
11 KiB
C++
/**
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* @file mingw.thread.h
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* @brief std::thread implementation for MinGW
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* (c) 2013-2016 by Mega Limited, Auckland, New Zealand
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* @author Alexander Vassilev
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*
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* @copyright Simplified (2-clause) BSD License.
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* You should have received a copy of the license along with this
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* program.
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*
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* This code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* @note
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* This file may become part of the mingw-w64 runtime package. If/when this happens,
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* the appropriate license will be added, i.e. this code will become dual-licensed,
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* and the current BSD 2-clause license will stay.
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*/
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#ifndef WIN32STDTHREAD_H
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#define WIN32STDTHREAD_H
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#if !defined(__cplusplus) || (__cplusplus < 201103L)
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#error A C++11 compiler is required!
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#endif
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// Use the standard classes for std::, if available.
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#include <thread>
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#include <cstddef> // For std::size_t
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#include <cerrno> // Detect error type.
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#include <exception> // For std::terminate
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#include <system_error> // For std::system_error
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#include <functional> // For std::hash
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#include <tuple> // For std::tuple
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#include <chrono> // For sleep timing.
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#include <memory> // For std::unique_ptr
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#include <iosfwd> // Stream output for thread ids.
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#include <utility> // For std::swap, std::forward
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#include "mingw.invoke.h"
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#if (defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR))
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#pragma message "The Windows API that MinGW-w32 provides is not fully compatible\
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with Microsoft's API. We'll try to work around this, but we can make no\
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guarantees. This problem does not exist in MinGW-w64."
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#include <windows.h> // No further granularity can be expected.
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#else
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#include <synchapi.h> // For WaitForSingleObject
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#include <handleapi.h> // For CloseHandle, etc.
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#include <sysinfoapi.h> // For GetNativeSystemInfo
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#include <processthreadsapi.h> // For GetCurrentThreadId
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#endif
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#include <process.h> // For _beginthreadex
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#ifndef NDEBUG
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#include <cstdio>
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#endif
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#if !defined(_WIN32_WINNT) || (_WIN32_WINNT < 0x0501)
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#error To use the MinGW-std-threads library, you will need to define the macro _WIN32_WINNT to be 0x0501 (Windows XP) or higher.
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#endif
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// Instead of INVALID_HANDLE_VALUE, _beginthreadex returns 0.
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namespace mingw_stdthread
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{
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namespace detail
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{
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template<std::size_t...>
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struct IntSeq {};
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template<std::size_t N, std::size_t... S>
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struct GenIntSeq : GenIntSeq<N-1, N-1, S...> { };
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template<std::size_t... S>
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struct GenIntSeq<0, S...> { typedef IntSeq<S...> type; };
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// Use a template specialization to avoid relying on compiler optimization
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// when determining the parameter integer sequence.
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template<class Func, class T, typename... Args>
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class ThreadFuncCall;
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// We can't define the Call struct in the function - the standard forbids template methods in that case
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template<class Func, std::size_t... S, typename... Args>
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class ThreadFuncCall<Func, detail::IntSeq<S...>, Args...>
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{
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static_assert(sizeof...(S) == sizeof...(Args), "Args must match.");
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using Tuple = std::tuple<typename std::decay<Args>::type...>;
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typename std::decay<Func>::type mFunc;
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Tuple mArgs;
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public:
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ThreadFuncCall(Func&& aFunc, Args&&... aArgs)
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: mFunc(std::forward<Func>(aFunc)),
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mArgs(std::forward<Args>(aArgs)...)
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{
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}
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void callFunc()
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{
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detail::invoke(std::move(mFunc), std::move(std::get<S>(mArgs)) ...);
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}
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};
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// Allow construction of threads without exposing implementation.
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class ThreadIdTool;
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} // Namespace "detail"
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class thread
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{
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public:
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class id
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{
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DWORD mId = 0;
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friend class thread;
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friend class std::hash<id>;
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friend class detail::ThreadIdTool;
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explicit id(DWORD aId) noexcept : mId(aId){}
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public:
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id (void) noexcept = default;
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friend bool operator==(id x, id y) noexcept {return x.mId == y.mId; }
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friend bool operator!=(id x, id y) noexcept {return x.mId != y.mId; }
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friend bool operator< (id x, id y) noexcept {return x.mId < y.mId; }
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friend bool operator<=(id x, id y) noexcept {return x.mId <= y.mId; }
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friend bool operator> (id x, id y) noexcept {return x.mId > y.mId; }
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friend bool operator>=(id x, id y) noexcept {return x.mId >= y.mId; }
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template<class _CharT, class _Traits>
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friend std::basic_ostream<_CharT, _Traits>&
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operator<<(std::basic_ostream<_CharT, _Traits>& __out, id __id)
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{
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if (__id.mId == 0)
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{
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return __out << "(invalid std::thread::id)";
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}
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else
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{
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return __out << __id.mId;
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}
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}
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};
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private:
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static constexpr HANDLE kInvalidHandle = nullptr;
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static constexpr DWORD kInfinite = 0xffffffffl;
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HANDLE mHandle;
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id mThreadId;
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template <class Call>
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static unsigned __stdcall threadfunc(void* arg)
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{
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std::unique_ptr<Call> call(static_cast<Call*>(arg));
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call->callFunc();
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return 0;
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}
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static unsigned int _hardware_concurrency_helper() noexcept
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{
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SYSTEM_INFO sysinfo;
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// This is one of the few functions used by the library which has a nearly-
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// equivalent function defined in earlier versions of Windows. Include the
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// workaround, just as a reminder that it does exist.
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#if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0501)
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::GetNativeSystemInfo(&sysinfo);
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#else
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::GetSystemInfo(&sysinfo);
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#endif
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return sysinfo.dwNumberOfProcessors;
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}
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public:
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typedef HANDLE native_handle_type;
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id get_id() const noexcept {return mThreadId;}
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native_handle_type native_handle() const {return mHandle;}
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thread(): mHandle(kInvalidHandle), mThreadId(){}
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thread(thread&& other)
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:mHandle(other.mHandle), mThreadId(other.mThreadId)
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{
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other.mHandle = kInvalidHandle;
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other.mThreadId = id{};
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}
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thread(const thread &other)=delete;
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template<class Func, typename... Args>
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explicit thread(Func&& func, Args&&... args) : mHandle(), mThreadId()
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{
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using ArgSequence = typename detail::GenIntSeq<sizeof...(Args)>::type;
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using Call = detail::ThreadFuncCall<Func, ArgSequence, Args...>;
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auto call = new Call(
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std::forward<Func>(func), std::forward<Args>(args)...);
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unsigned id_receiver;
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auto int_handle = _beginthreadex(NULL, 0, threadfunc<Call>,
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static_cast<LPVOID>(call), 0, &id_receiver);
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if (int_handle == 0)
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{
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mHandle = kInvalidHandle;
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int errnum = errno;
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delete call;
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// Note: Should only throw EINVAL, EAGAIN, EACCES
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__builtin_trap();
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} else {
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mThreadId.mId = id_receiver;
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mHandle = reinterpret_cast<HANDLE>(int_handle);
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}
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}
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bool joinable() const {return mHandle != kInvalidHandle;}
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// Note: Due to lack of synchronization, this function has a race condition
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// if called concurrently, which leads to undefined behavior. The same applies
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// to all other member functions of this class, but this one is mentioned
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// explicitly.
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void join()
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{
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using namespace std;
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if (get_id() == id(GetCurrentThreadId()))
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__builtin_trap();
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if (mHandle == kInvalidHandle)
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__builtin_trap();
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if (!joinable())
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__builtin_trap();
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WaitForSingleObject(mHandle, kInfinite);
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CloseHandle(mHandle);
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mHandle = kInvalidHandle;
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mThreadId = id{};
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}
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~thread()
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{
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if (joinable())
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{
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#ifndef NDEBUG
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std::printf("Error: Must join() or detach() a thread before \
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destroying it.\n");
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#endif
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std::terminate();
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}
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}
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thread& operator=(const thread&) = delete;
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thread& operator=(thread&& other) noexcept
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{
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if (joinable())
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{
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#ifndef NDEBUG
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std::printf("Error: Must join() or detach() a thread before \
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moving another thread to it.\n");
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#endif
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std::terminate();
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}
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swap(std::forward<thread>(other));
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return *this;
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}
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void swap(thread&& other) noexcept
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{
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std::swap(mHandle, other.mHandle);
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std::swap(mThreadId.mId, other.mThreadId.mId);
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}
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static unsigned int hardware_concurrency() noexcept
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{
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static unsigned int cached = _hardware_concurrency_helper();
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return cached;
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}
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void detach()
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{
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if (!joinable())
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{
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using namespace std;
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__builtin_trap();
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}
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if (mHandle != kInvalidHandle)
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{
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CloseHandle(mHandle);
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mHandle = kInvalidHandle;
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}
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mThreadId = id{};
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}
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};
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namespace detail
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{
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class ThreadIdTool
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{
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public:
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static thread::id make_id (DWORD base_id) noexcept
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{
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return thread::id(base_id);
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}
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};
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} // Namespace "detail"
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namespace this_thread
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{
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inline thread::id get_id() noexcept
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{
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return detail::ThreadIdTool::make_id(GetCurrentThreadId());
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}
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inline void yield() noexcept {Sleep(0);}
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template< class Rep, class Period >
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void sleep_for( const std::chrono::duration<Rep,Period>& sleep_duration)
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{
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static constexpr DWORD kInfinite = 0xffffffffl;
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using namespace std::chrono;
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using rep = milliseconds::rep;
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rep ms = duration_cast<milliseconds>(sleep_duration).count();
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while (ms > 0)
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{
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constexpr rep kMaxRep = static_cast<rep>(kInfinite - 1);
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auto sleepTime = (ms < kMaxRep) ? ms : kMaxRep;
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Sleep(static_cast<DWORD>(sleepTime));
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ms -= sleepTime;
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}
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}
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template <class Clock, class Duration>
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void sleep_until(const std::chrono::time_point<Clock,Duration>& sleep_time)
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{
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sleep_for(sleep_time-Clock::now());
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}
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}
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} // Namespace mingw_stdthread
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namespace std
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{
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// Because of quirks of the compiler, the common "using namespace std;"
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// directive would flatten the namespaces and introduce ambiguity where there
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// was none. Direct specification (std::), however, would be unaffected.
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// Take the safe option, and include only in the presence of MinGW's win32
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// implementation.
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#if defined(__MINGW32__ ) && !defined(_GLIBCXX_HAS_GTHREADS)
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using mingw_stdthread::thread;
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// Remove ambiguity immediately, to avoid problems arising from the above.
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//using std::thread;
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namespace this_thread
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{
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using namespace mingw_stdthread::this_thread;
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}
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#elif !defined(MINGW_STDTHREAD_REDUNDANCY_WARNING) // Skip repetition
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#define MINGW_STDTHREAD_REDUNDANCY_WARNING
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#pragma message "This version of MinGW seems to include a win32 port of\
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pthreads, and probably already has C++11 std threading classes implemented,\
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based on pthreads. These classes, found in namespace std, are not overridden\
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by the mingw-std-thread library. If you would still like to use this\
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implementation (as it is more lightweight), use the classes provided in\
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namespace mingw_stdthread."
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#endif
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// Specialize hash for this implementation's thread::id, even if the
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// std::thread::id already has a hash.
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template<>
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struct hash<mingw_stdthread::thread::id>
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{
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typedef mingw_stdthread::thread::id argument_type;
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typedef size_t result_type;
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size_t operator() (const argument_type & i) const noexcept
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{
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return i.mId;
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}
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};
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}
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#endif // WIN32STDTHREAD_H
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