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/*
* Copyright (c) 2008 Niels Provos <provos@citi.umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _EVTHREAD_INTERNAL_H_
#define _EVTHREAD_INTERNAL_H_
#ifdef __cplusplus
//extern "C" {
#endif
#include "event-config.h"
struct event_base;
#ifndef _EVENT_DISABLE_THREAD_SUPPORT
extern void (*_evthread_locking_fn)(int mode, void *lock);
extern unsigned long (*_evthread_id_fn)(void);
extern void *(*_evthread_lock_alloc_fn)(void);
extern void (*_evthread_lock_free_fn)(void *);
#define EVBASE_USING_LOCKS(base) \
(base != NULL && (base)->th_base_lock != NULL)
#define EVTHREAD_GET_ID() \
(_evthread_id_fn ? _evthread_id_fn() : 1)
#define EVBASE_IN_THREAD(base) \
(_evthread_id_fn == NULL || \
(base)->th_owner_id == _evthread_id_fn())
#define EVTHREAD_ALLOC_LOCK(lockvar) \
((lockvar) = _evthread_lock_alloc_fn ? \
_evthread_lock_alloc_fn() : NULL)
#define EVTHREAD_FREE_LOCK(lockvar) \
do { \
if (lockvar && _evthread_lock_free_fn) \
_evthread_lock_free_fn(lockvar); \
} while (0)
#define EVLOCK_LOCK(lock,mode) \
do { \
if (lock) \
_evthread_locking_fn(EVTHREAD_LOCK|mode, lock); \
} while (0)
#define EVLOCK_UNLOCK(lock,mode) \
do { \
if (lock) \
_evthread_locking_fn(EVTHREAD_UNLOCK|mode, lock); \
} while (0)
#define _EVLOCK_SORTLOCKS(lockvar1, lockvar2) \
do { \
if (lockvar1 && lockvar2 && lockvar1 > lockvar2) { \
void *tmp = lockvar1; \
lockvar1 = lockvar2; \
lockvar2 = tmp; \
} \
} while (0)
#define EVLOCK_LOCK2(lock1,lock2,mode1,mode2) \
do { \
void *_lock1_tmplock = (lock1); \
void *_lock2_tmplock = (lock2); \
_EVLOCK_SORTLOCKS(_lock1_tmplock,_lock2_tmplock); \
EVLOCK_LOCK(_lock1_tmplock,mode1); \
if (_lock2_tmplock != _lock1_tmplock) \
EVLOCK_LOCK(_lock2_tmplock,mode2); \
} while (0)
#define EVLOCK_UNLOCK2(lock1,lock2,mode1,mode2) \
do { \
void *_lock1_tmplock = (lock1); \
void *_lock2_tmplock = (lock2); \
_EVLOCK_SORTLOCKS(_lock1_tmplock,_lock2_tmplock); \
if (_lock2_tmplock != _lock1_tmplock) \
EVLOCK_UNLOCK(_lock2_tmplock,mode2); \
EVLOCK_UNLOCK(_lock1_tmplock,mode1); \
} while (0)
#define EVBASE_ACQUIRE_LOCK(base, mode, lock) do { \
if (EVBASE_USING_LOCKS(base)) \
_evthread_locking_fn(EVTHREAD_LOCK | mode, \
(base)->lock); \
} while (0)
#define EVBASE_RELEASE_LOCK(base, mode, lock) do { \
if (EVBASE_USING_LOCKS(base)) \
_evthread_locking_fn(EVTHREAD_UNLOCK | mode, \
(base)->lock); \
} while (0)
#else /* _EVENT_DISABLE_THREAD_SUPPORT */
#define EVTHREAD_GET_ID() 1
#define EVTHREAD_ALLOC_LOCK(lockvar)
#define EVTHREAD_FREE_LOCK(lockvar)
#define EVBASE_IN_THREAD() 1
#define EVBASE_ACQUIRE_LOCK(base, mode, lock)
#define EVBASE_RELEASE_LOCK(base, mode, lock)
#endif
#ifdef __cplusplus
}
#endif
#endif /* _EVTHREAD_INTERNAL_H_ */
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