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96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/**
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* Copyright (c) 2016 Tino Reichardt
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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*
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* You can contact the author at:
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* - zstdmt source repository: https://github.com/mcmilk/zstdmt
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*/
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/**
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* This file will hold wrapper for systems, which do not support pthreads
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*/
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/* create fake symbol to avoid empty translation unit warning */
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int g_ZSTD_threading_useles_symbol;
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#include "fast-lzma2.h"
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#include "fl2_threading.h"
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#include "util.h"
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#if !defined(FL2_SINGLETHREAD) && defined(_WIN32)
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/**
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* Windows minimalist Pthread Wrapper, based on :
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* http://www.cse.wustl.edu/~schmidt/win32-cv-1.html
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*/
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/* === Dependencies === */
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#include <process.h>
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#include <errno.h>
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/* === Implementation === */
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static unsigned __stdcall worker(void *arg)
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{
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FL2_pthread_t* const thread = (FL2_pthread_t*) arg;
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thread->arg = thread->start_routine(thread->arg);
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return 0;
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}
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int FL2_pthread_create(FL2_pthread_t* thread, const void* unused,
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void* (*start_routine) (void*), void* arg)
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{
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(void)unused;
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thread->arg = arg;
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thread->start_routine = start_routine;
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thread->handle = (HANDLE) _beginthreadex(NULL, 0, worker, thread, 0, NULL);
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if (!thread->handle)
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return errno;
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else
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return 0;
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}
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int FL2_pthread_join(FL2_pthread_t thread, void **value_ptr)
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{
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DWORD result;
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if (!thread.handle) return 0;
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result = WaitForSingleObject(thread.handle, INFINITE);
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switch (result) {
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case WAIT_OBJECT_0:
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if (value_ptr) *value_ptr = thread.arg;
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return 0;
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case WAIT_ABANDONED:
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return EINVAL;
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default:
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return GetLastError();
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}
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}
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#endif /* FL2_SINGLETHREAD */
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unsigned FL2_checkNbThreads(unsigned nbThreads)
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{
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#ifndef FL2_SINGLETHREAD
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if (nbThreads == 0) {
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nbThreads = UTIL_countPhysicalCores();
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nbThreads += !nbThreads;
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}
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if (nbThreads > FL2_MAXTHREADS) {
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nbThreads = FL2_MAXTHREADS;
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}
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#else
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nbThreads = 1;
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#endif
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return nbThreads;
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}
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