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347952ffe0
Previously, there was no good way to request different kinds of lock (say, read/write vs writeonly or recursive vs nonrecursive), or for a lock function to signal failure (which would be important for a trylock mode). This patch revises the lock API to be a bit more useful. The older lock calls are still supported for now. We also add a debugging mode to catch common errors in using the locking APIs.
100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/*
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* Copyright 2009 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "event-config.h"
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#ifdef WIN32
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#include <winsock2.h>
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#undef WIN32_LEAN_AND_MEAN
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#include <sys/locking.h>
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#endif
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struct event_base;
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#include <event2/thread.h>
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#include "mm-internal.h"
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static void *
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evthread_win32_lock_create(unsigned locktype)
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{
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CRITICAL_SECTION *lock = mm_malloc(sizeof(CRITICAL_SECTION));
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if (!lock)
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return NULL;
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InitializeCriticalSection(lock);
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return lock;
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}
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static void
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evthread_win32_lock_free(void *_lock, unsigned locktype)
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{
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CRITICAL_SECTION *lock = _lock;
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DeleteCriticalSection(lock);
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}
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static void
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evthread_win32_lock(unsigned mode, void *_lock)
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{
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CRITICAL_SECTION *lock = _lock;
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if ((mode & EVTHREAD_TRY)) {
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return TryEnterCriticalSection(lock) != 0;
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} else {
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EnterCriticalSection(lock);
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return 0;
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}
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}
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static void
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evthread_win32_unlock(unsigned mode, void *_lock)
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{
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CRITICAL_SECTION *lock = _lock;
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LeaveCriticalSection(lock)
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}
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static unsigned long
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evthread_win32_get_id(void)
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{
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return (unsigned long) GetCurrentThreadId();
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}
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int
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evthread_use_windows_threads(void)
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{
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struct evthread_lock_callbacks cbs = {
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EVTHREAD_LOCK_API_VERSION,
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EVTHREAD_LOCKTYPE_RECURSIVE,
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evthread_win32_lock_alloc,
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evthread_win32_lock_free,
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evthread_win32_lock,
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evthread_win32_unlock
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};
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evthread_set_lock_callbacks(&cbs);
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evthread_set_id_callback(evthread_win32_get_id);
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return 0;
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}
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