+++ /dev/null
-/*
- * Copyright (c) 2008-2010 Niels Provos, Nick Mathewson
- *
- * 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 "event2/thread.h"
-#include "event2/event-config.h"
-#include "util-internal.h"
-
-struct event_base;
-
-#ifndef WIN32
-/* On Windows, the way we currently make DLLs, it's not allowed for us to
- * have shared global structures. Thus, we only do the direct-call-to-function
- * code path if we know that the local shared library system supports it.
- */
-#define EVTHREAD_EXPOSE_STRUCTS
-#endif
-
-#if ! defined(_EVENT_DISABLE_THREAD_SUPPORT) && defined(EVTHREAD_EXPOSE_STRUCTS)
-/* Global function pointers to lock-related functions. NULL if locking isn't
- enabled. */
-extern struct evthread_lock_callbacks _evthread_lock_fns;
-extern struct evthread_condition_callbacks _evthread_cond_fns;
-extern unsigned long (*_evthread_id_fn)(void);
-extern int _evthread_lock_debugging_enabled;
-
-/** Return the ID of the current thread, or 1 if threading isn't enabled. */
-#define EVTHREAD_GET_ID() \
- (_evthread_id_fn ? _evthread_id_fn() : 1)
-
-/** Return true iff we're in the thread that is currently (or most recently)
- * running a given event_base's loop. Requires lock. */
-#define EVBASE_IN_THREAD(base) \
- (_evthread_id_fn == NULL || \
- (base)->th_owner_id == _evthread_id_fn())
-
-/** Return true iff we need to notify the base's main thread about changes to
- * its state, because it's currently running the main loop in another
- * thread. Requires lock. */
-#define EVBASE_NEED_NOTIFY(base) \
- (_evthread_id_fn != NULL && \
- (base)->running_loop && \
- (base)->th_owner_id != _evthread_id_fn())
-
-/** Allocate a new lock, and store it in lockvar, a void*. Sets lockvar to
- NULL if locking is not enabled. */
-#define EVTHREAD_ALLOC_LOCK(lockvar, locktype) \
- ((lockvar) = _evthread_lock_fns.alloc ? \
- _evthread_lock_fns.alloc(locktype) : NULL)
-
-/** Free a given lock, if it is present and locking is enabled. */
-#define EVTHREAD_FREE_LOCK(lockvar, locktype) \
- do { \
- void *_lock_tmp_ = (lockvar); \
- if (_lock_tmp_ && _evthread_lock_fns.free) \
- _evthread_lock_fns.free(_lock_tmp_, (locktype)); \
- } while (0)
-
-/** Acquire a lock. */
-#define EVLOCK_LOCK(lockvar,mode) \
- do { \
- if (lockvar) \
- _evthread_lock_fns.lock(mode, lockvar); \
- } while (0)
-
-/** Release a lock */
-#define EVLOCK_UNLOCK(lockvar,mode) \
- do { \
- if (lockvar) \
- _evthread_lock_fns.unlock(mode, lockvar); \
- } while (0)
-
-/** Helper: put lockvar1 and lockvar2 into pointerwise ascending order. */
-#define _EVLOCK_SORTLOCKS(lockvar1, lockvar2) \
- do { \
- if (lockvar1 && lockvar2 && lockvar1 > lockvar2) { \
- void *tmp = lockvar1; \
- lockvar1 = lockvar2; \
- lockvar2 = tmp; \
- } \
- } while (0)
-
-/** Lock an event_base, if it is set up for locking. Acquires the lock
- in the base structure whose field is named 'lockvar'. */
-#define EVBASE_ACQUIRE_LOCK(base, lockvar) do { \
- EVLOCK_LOCK((base)->lockvar, 0); \
- } while (0)
-
-/** Unlock an event_base, if it is set up for locking. */
-#define EVBASE_RELEASE_LOCK(base, lockvar) do { \
- EVLOCK_UNLOCK((base)->lockvar, 0); \
- } while (0)
-
-/** If lock debugging is enabled, and lock is non-null, assert that 'lock' is
- * locked and held by us. */
-#define EVLOCK_ASSERT_LOCKED(lock) \
- do { \
- if ((lock) && _evthread_lock_debugging_enabled) { \
- EVUTIL_ASSERT(_evthread_is_debug_lock_held(lock)); \
- } \
- } while (0)
-
-/** Try to grab the lock for 'lockvar' without blocking, and return 1 if we
- * manage to get it. */
-static inline int EVLOCK_TRY_LOCK(void *lock);
-static inline int
-EVLOCK_TRY_LOCK(void *lock)
-{
- if (lock && _evthread_lock_fns.lock) {
- int r = _evthread_lock_fns.lock(EVTHREAD_TRY, lock);
- return !r;
- } else {
- /* Locking is disabled either globally or for this thing;
- * of course we count as having the lock. */
- return 1;
- }
-}
-
-/** Allocate a new condition variable and store it in the void *, condvar */
-#define EVTHREAD_ALLOC_COND(condvar) \
- do { \
- (condvar) = _evthread_cond_fns.alloc_condition ? \
- _evthread_cond_fns.alloc_condition(0) : NULL; \
- } while (0)
-/** Deallocate and free a condition variable in condvar */
-#define EVTHREAD_FREE_COND(cond) \
- do { \
- if (cond) \
- _evthread_cond_fns.free_condition((cond)); \
- } while (0)
-/** Signal one thread waiting on cond */
-#define EVTHREAD_COND_SIGNAL(cond) \
- ( (cond) ? _evthread_cond_fns.signal_condition((cond), 0) : 0 )
-/** Signal all threads waiting on cond */
-#define EVTHREAD_COND_BROADCAST(cond) \
- ( (cond) ? _evthread_cond_fns.signal_condition((cond), 1) : 0 )
-/** Wait until the condition 'cond' is signalled. Must be called while
- * holding 'lock'. The lock will be released until the condition is
- * signalled, at which point it will be acquired again. Returns 0 for
- * success, -1 for failure. */
-#define EVTHREAD_COND_WAIT(cond, lock) \
- ( (cond) ? _evthread_cond_fns.wait_condition((cond), (lock), NULL) : 0 )
-/** As EVTHREAD_COND_WAIT, but gives up after 'tv' has elapsed. Returns 1
- * on timeout. */
-#define EVTHREAD_COND_WAIT_TIMED(cond, lock, tv) \
- ( (cond) ? _evthread_cond_fns.wait_condition((cond), (lock), (tv)) : 0 )
-
-#elif ! defined(_EVENT_DISABLE_THREAD_SUPPORT)
-
-unsigned long _evthreadimpl_get_id(void);
-int _evthreadimpl_is_lock_debugging_enabled(void);
-void *_evthreadimpl_lock_alloc(unsigned locktype);
-void _evthreadimpl_lock_free(void *lock, unsigned locktype);
-int _evthreadimpl_lock_lock(unsigned mode, void *lock);
-int _evthreadimpl_lock_unlock(unsigned mode, void *lock);
-void *_evthreadimpl_cond_alloc(unsigned condtype);
-void _evthreadimpl_cond_free(void *cond);
-int _evthreadimpl_cond_signal(void *cond, int broadcast);
-int _evthreadimpl_cond_wait(void *cond, void *lock, const struct timeval *tv);
-
-#define EVTHREAD_GET_ID() _evthreadimpl_get_id()
-#define EVBASE_IN_THREAD(base) \
- ((base)->th_owner_id == _evthreadimpl_get_id())
-#define EVBASE_NEED_NOTIFY(base) \
- ((base)->running_loop && \
- ((base)->th_owner_id != _evthreadimpl_get_id()))
-
-#define EVTHREAD_ALLOC_LOCK(lockvar, locktype) \
- ((lockvar) = _evthreadimpl_lock_alloc(locktype))
-
-#define EVTHREAD_FREE_LOCK(lockvar, locktype) \
- do { \
- void *_lock_tmp_ = (lockvar); \
- if (_lock_tmp_) \
- _evthreadimpl_lock_free(_lock_tmp_, (locktype)); \
- } while (0)
-
-/** Acquire a lock. */
-#define EVLOCK_LOCK(lockvar,mode) \
- do { \
- if (lockvar) \
- _evthreadimpl_lock_lock(mode, lockvar); \
- } while (0)
-
-/** Release a lock */
-#define EVLOCK_UNLOCK(lockvar,mode) \
- do { \
- if (lockvar) \
- _evthreadimpl_lock_unlock(mode, lockvar); \
- } while (0)
-
-/** Lock an event_base, if it is set up for locking. Acquires the lock
- in the base structure whose field is named 'lockvar'. */
-#define EVBASE_ACQUIRE_LOCK(base, lockvar) do { \
- EVLOCK_LOCK((base)->lockvar, 0); \
- } while (0)
-
-/** Unlock an event_base, if it is set up for locking. */
-#define EVBASE_RELEASE_LOCK(base, lockvar) do { \
- EVLOCK_UNLOCK((base)->lockvar, 0); \
- } while (0)
-
-/** If lock debugging is enabled, and lock is non-null, assert that 'lock' is
- * locked and held by us. */
-#define EVLOCK_ASSERT_LOCKED(lock) \
- do { \
- if ((lock) && _evthreadimpl_is_lock_debugging_enabled()) { \
- EVUTIL_ASSERT(_evthread_is_debug_lock_held(lock)); \
- } \
- } while (0)
-
-/** Try to grab the lock for 'lockvar' without blocking, and return 1 if we
- * manage to get it. */
-static inline int EVLOCK_TRY_LOCK(void *lock);
-static inline int
-EVLOCK_TRY_LOCK(void *lock)
-{
- if (lock) {
- int r = _evthreadimpl_lock_lock(EVTHREAD_TRY, lock);
- return !r;
- } else {
- /* Locking is disabled either globally or for this thing;
- * of course we count as having the lock. */
- return 1;
- }
-}
-
-/** Allocate a new condition variable and store it in the void *, condvar */
-#define EVTHREAD_ALLOC_COND(condvar) \
- do { \
- (condvar) = _evthreadimpl_cond_alloc(0); \
- } while (0)
-/** Deallocate and free a condition variable in condvar */
-#define EVTHREAD_FREE_COND(cond) \
- do { \
- if (cond) \
- _evthreadimpl_cond_free((cond)); \
- } while (0)
-/** Signal one thread waiting on cond */
-#define EVTHREAD_COND_SIGNAL(cond) \
- ( (cond) ? _evthreadimpl_cond_signal((cond), 0) : 0 )
-/** Signal all threads waiting on cond */
-#define EVTHREAD_COND_BROADCAST(cond) \
- ( (cond) ? _evthreadimpl_cond_signal((cond), 1) : 0 )
-/** Wait until the condition 'cond' is signalled. Must be called while
- * holding 'lock'. The lock will be released until the condition is
- * signalled, at which point it will be acquired again. Returns 0 for
- * success, -1 for failure. */
-#define EVTHREAD_COND_WAIT(cond, lock) \
- ( (cond) ? _evthreadimpl_cond_wait((cond), (lock), NULL) : 0 )
-/** As EVTHREAD_COND_WAIT, but gives up after 'tv' has elapsed. Returns 1
- * on timeout. */
-#define EVTHREAD_COND_WAIT_TIMED(cond, lock, tv) \
- ( (cond) ? _evthreadimpl_cond_wait((cond), (lock), (tv)) : 0 )
-
-#else /* _EVENT_DISABLE_THREAD_SUPPORT */
-
-#define EVTHREAD_GET_ID() 1
-#define EVTHREAD_ALLOC_LOCK(lockvar, locktype) _EVUTIL_NIL_STMT
-#define EVTHREAD_FREE_LOCK(lockvar, locktype) _EVUTIL_NIL_STMT
-
-#define EVLOCK_LOCK(lockvar, mode) _EVUTIL_NIL_STMT
-#define EVLOCK_UNLOCK(lockvar, mode) _EVUTIL_NIL_STMT
-#define EVLOCK_LOCK2(lock1,lock2,mode1,mode2) _EVUTIL_NIL_STMT
-#define EVLOCK_UNLOCK2(lock1,lock2,mode1,mode2) _EVUTIL_NIL_STMT
-
-#define EVBASE_IN_THREAD(base) 1
-#define EVBASE_NEED_NOTIFY(base) 0
-#define EVBASE_ACQUIRE_LOCK(base, lock) _EVUTIL_NIL_STMT
-#define EVBASE_RELEASE_LOCK(base, lock) _EVUTIL_NIL_STMT
-#define EVLOCK_ASSERT_LOCKED(lock) _EVUTIL_NIL_STMT
-
-#define EVLOCK_TRY_LOCK(lock) 1
-
-#define EVTHREAD_ALLOC_COND(condvar) _EVUTIL_NIL_STMT
-#define EVTHREAD_FREE_COND(cond) _EVUTIL_NIL_STMT
-#define EVTHREAD_COND_SIGNAL(cond) _EVUTIL_NIL_STMT
-#define EVTHREAD_COND_BROADCAST(cond) _EVUTIL_NIL_STMT
-#define EVTHREAD_COND_WAIT(cond, lock) _EVUTIL_NIL_STMT
-#define EVTHREAD_COND_WAIT_TIMED(cond, lock, howlong) _EVUTIL_NIL_STMT
-
-#endif
-
-/* This code is shared between both lock impls */
-#if ! defined(_EVENT_DISABLE_THREAD_SUPPORT)
-/** Helper: put lockvar1 and lockvar2 into pointerwise ascending order. */
-#define _EVLOCK_SORTLOCKS(lockvar1, lockvar2) \
- do { \
- if (lockvar1 && lockvar2 && lockvar1 > lockvar2) { \
- void *tmp = lockvar1; \
- lockvar1 = lockvar2; \
- lockvar2 = tmp; \
- } \
- } while (0)
-
-/** Acquire both lock1 and lock2. Always allocates locks in the same order,
- * so that two threads locking two locks with LOCK2 will not deadlock. */
-#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)
-/** Release both lock1 and lock2. */
-#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)
-
-int _evthread_is_debug_lock_held(void *lock);
-void *_evthread_debug_get_real_lock(void *lock);
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _EVTHREAD_INTERNAL_H_ */
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