81ef251fc8
- Improved/completed(almost) winpr's critical section implementation - Replaced WaitForSingleObject locking with critical sections Note: WaitForSingleObject should _never_ be used for granular low-contention locks as it _always_ enters the kernel. Just replacing WaitForSingleObject locking in Bufferpool with EnterCriticalSection boosts the multithreaded rfx decoder performance by almost 400% on win32.
115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/**
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* WinPR: Windows Portable Runtime
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* Synchronization Functions
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*
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* Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <winpr/synch.h>
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#include "synch.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifndef _WIN32
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/**
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* TODO: EnterCriticalSection allows recursive calls from the same thread.
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* Implement this using pthreads (see PTHREAD_MUTEX_RECURSIVE_NP)
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* http://msdn.microsoft.com/en-us/library/windows/desktop/ms682608%28v=vs.85%29.aspx
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*/
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VOID InitializeCriticalSection(LPCRITICAL_SECTION lpCriticalSection)
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{
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if (lpCriticalSection)
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{
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lpCriticalSection->DebugInfo = NULL;
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lpCriticalSection->LockCount = 0;
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lpCriticalSection->RecursionCount = 0;
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lpCriticalSection->SpinCount = 0;
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lpCriticalSection->OwningThread = NULL;
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lpCriticalSection->LockSemaphore = NULL;
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lpCriticalSection->LockSemaphore = malloc(sizeof(pthread_mutex_t));
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pthread_mutex_init(lpCriticalSection->LockSemaphore, NULL);
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}
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}
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BOOL InitializeCriticalSectionEx(LPCRITICAL_SECTION lpCriticalSection, DWORD dwSpinCount, DWORD Flags)
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{
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if (Flags != 0) {
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fprintf(stderr, "warning: InitializeCriticalSectionEx Flags unimplemented\n");
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}
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return InitializeCriticalSectionAndSpinCount(lpCriticalSection, dwSpinCount);
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}
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BOOL InitializeCriticalSectionAndSpinCount(LPCRITICAL_SECTION lpCriticalSection, DWORD dwSpinCount)
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{
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InitializeCriticalSection(lpCriticalSection);
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SetCriticalSectionSpinCount(lpCriticalSection, dwSpinCount);
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return TRUE;
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}
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DWORD SetCriticalSectionSpinCount(LPCRITICAL_SECTION lpCriticalSection, DWORD dwSpinCount)
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{
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DWORD dwPreviousSpinCount = lpCriticalSection->SpinCount;
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lpCriticalSection->SpinCount = dwSpinCount;
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return dwPreviousSpinCount;
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}
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VOID EnterCriticalSection(LPCRITICAL_SECTION lpCriticalSection)
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{
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/**
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* Linux NPTL thread synchronization primitives are implemented using
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* the futex system calls ... no need for performing a trylock loop.
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*/
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#if !defined(__linux__)
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ULONG spin = lpCriticalSection->SpinCount;
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while (spin--)
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{
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if (pthread_mutex_trylock((pthread_mutex_t*)lpCriticalSection->LockSemaphore) == 0)
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return;
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pthread_yield();
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}
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#endif
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pthread_mutex_lock((pthread_mutex_t*)lpCriticalSection->LockSemaphore);
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}
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BOOL TryEnterCriticalSection(LPCRITICAL_SECTION lpCriticalSection)
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{
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return (pthread_mutex_trylock((pthread_mutex_t*)lpCriticalSection->LockSemaphore) == 0 ? TRUE : FALSE);
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}
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VOID LeaveCriticalSection(LPCRITICAL_SECTION lpCriticalSection)
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{
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pthread_mutex_unlock((pthread_mutex_t*)lpCriticalSection->LockSemaphore);
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}
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VOID DeleteCriticalSection(LPCRITICAL_SECTION lpCriticalSection)
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{
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pthread_mutex_destroy((pthread_mutex_t*)lpCriticalSection->LockSemaphore);
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free(lpCriticalSection->LockSemaphore);
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}
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#endif
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