avrdude/msvc/pthread.cpp

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/*
* avrdude - A Downloader/Uploader for AVR device programmers
* Copyright (C) 2018 Marius Greuel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pthread.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <process.h>
#include <cerrno>
#include <exception>
#include <memory>
#include "IntegerHandleMap.h"
struct ThreadContext
{
~ThreadContext()
{
if (hCancel != nullptr)
{
CloseHandle(hCancel);
hCancel = nullptr;
}
if (hThread != nullptr)
{
CloseHandle(hThread);
hThread = nullptr;
}
}
using start_routine_t = void* (*)(void*);
HANDLE hThread = nullptr;
HANDLE hCancel = nullptr;
start_routine_t start_routine = nullptr;
void* arguments = nullptr;
int canceltype = 0;
};
static IntegerHandleMap<pthread_t, std::shared_ptr<ThreadContext>> contextMap;
static thread_local pthread_t currentThread;
static unsigned __stdcall pthread_start_routine_wrapper(void* arguments)
{
pthread_t id = reinterpret_cast<pthread_t>(arguments);
auto context = contextMap.Lookup(id);
if (context == nullptr)
{
return ESRCH;
}
currentThread = id;
context->start_routine(context->arguments);
return 0;
}
int pthread_create(pthread_t* thread, const pthread_attr_t* attr, void* (*start_routine) (void*), void* arg)
{
try
{
auto context = std::make_shared<ThreadContext>();
context->start_routine = start_routine;
context->arguments = arg;
auto id = contextMap.Add(context);
context->hThread = reinterpret_cast<HANDLE>(_beginthreadex(nullptr, 0, pthread_start_routine_wrapper, reinterpret_cast<void*>(id), 0, nullptr));
if (context->hThread == nullptr)
{
return ENOMEM;
}
*thread = id;
return 0;
}
catch (std::exception&)
{
return ENOMEM;
}
}
void pthread_exit(void* retval)
{
_endthreadex(static_cast<unsigned int>(reinterpret_cast<uintptr_t>(retval)));
}
int pthread_cancel(pthread_t thread)
{
auto context = contextMap.Lookup(thread);
if (context == nullptr)
{
return ESRCH;
}
if (context->hCancel == nullptr)
{
context->hCancel = CreateEventW(nullptr, TRUE, FALSE, nullptr);
if (context->hCancel == nullptr)
{
return ENOMEM;
}
}
if (!SetEvent(context->hCancel))
{
return 1;
}
return 0;
}
int pthread_join(pthread_t thread, void** retval)
{
auto context = contextMap.Lookup(thread);
if (context == nullptr)
return ESRCH;
DWORD dwStatus = WaitForSingleObject(context->hThread, INFINITE);
if (dwStatus == WAIT_OBJECT_0)
{
if (retval != nullptr)
{
DWORD dwExitCode = 0;
if (GetExitCodeThread(context->hThread, &dwExitCode))
{
*retval = reinterpret_cast<void*>(static_cast<uintptr_t>(dwExitCode));
}
else
{
*retval = nullptr;
}
}
contextMap.Remove(thread);
return 0;
}
else
{
return EINVAL;
}
}
int pthread_setcanceltype(int type, int* oldtype)
{
auto context = contextMap.Lookup(currentThread);
if (context == nullptr)
return ESRCH;
if (oldtype != nullptr)
{
*oldtype = context->canceltype;
}
context->canceltype = type;
return 0;
}
void pthread_testcancel(void)
{
auto context = contextMap.Lookup(currentThread);
if (context == nullptr)
return;
if (context->hCancel != nullptr)
{
DWORD dwStatus = WaitForSingleObject(context->hCancel, 0);
if (dwStatus == WAIT_OBJECT_0)
{
pthread_exit(nullptr);
}
}
}