393 lines
14 KiB
C
393 lines
14 KiB
C
/*
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* Copyright (c) 2008-2012 Niels Provos, 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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#ifndef EVTHREAD_INTERNAL_H_INCLUDED_
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#define EVTHREAD_INTERNAL_H_INCLUDED_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "event2/event-config.h"
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#include "evconfig-private.h"
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#include "event2/thread.h"
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#include "util-internal.h"
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struct event_base;
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#ifndef _WIN32
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/* On Windows, the way we currently make DLLs, it's not allowed for us to
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* have shared global structures. Thus, we only do the direct-call-to-function
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* code path if we know that the local shared library system supports it.
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*/
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#define EVTHREAD_EXPOSE_STRUCTS
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#endif
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#if ! defined(EVENT__DISABLE_THREAD_SUPPORT) && defined(EVTHREAD_EXPOSE_STRUCTS)
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/* Global function pointers to lock-related functions. NULL if locking isn't
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enabled. */
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extern struct evthread_lock_callbacks evthread_lock_fns_;
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extern struct evthread_condition_callbacks evthread_cond_fns_;
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extern unsigned long (*evthread_id_fn_)(void);
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extern int evthread_lock_debugging_enabled_;
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/** Return the ID of the current thread, or 1 if threading isn't enabled. */
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#define EVTHREAD_GET_ID() \
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(evthread_id_fn_ ? evthread_id_fn_() : 1)
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/** Return true iff we're in the thread that is currently (or most recently)
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* running a given event_base's loop. Requires lock. */
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#define EVBASE_IN_THREAD(base) \
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(evthread_id_fn_ == NULL || \
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(base)->th_owner_id == evthread_id_fn_())
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/** Return true iff we need to notify the base's main thread about changes to
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* its state, because it's currently running the main loop in another
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* thread. Requires lock. */
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#define EVBASE_NEED_NOTIFY(base) \
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(evthread_id_fn_ != NULL && \
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(base)->running_loop && \
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(base)->th_owner_id != evthread_id_fn_())
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/** Allocate a new lock, and store it in lockvar, a void*. Sets lockvar to
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NULL if locking is not enabled. */
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#define EVTHREAD_ALLOC_LOCK(lockvar, locktype) \
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((lockvar) = evthread_lock_fns_.alloc ? \
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evthread_lock_fns_.alloc(locktype) : NULL)
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/** Free a given lock, if it is present and locking is enabled. */
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#define EVTHREAD_FREE_LOCK(lockvar, locktype) \
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do { \
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void *lock_tmp_ = (lockvar); \
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if (lock_tmp_ && evthread_lock_fns_.free) \
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evthread_lock_fns_.free(lock_tmp_, (locktype)); \
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} while (0)
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/** Acquire a lock. */
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#define EVLOCK_LOCK(lockvar,mode) \
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do { \
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if (lockvar) \
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evthread_lock_fns_.lock(mode, lockvar); \
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} while (0)
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/** Release a lock */
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#define EVLOCK_UNLOCK(lockvar,mode) \
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do { \
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if (lockvar) \
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evthread_lock_fns_.unlock(mode, lockvar); \
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} while (0)
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/** Helper: put lockvar1 and lockvar2 into pointerwise ascending order. */
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#define EVLOCK_SORTLOCKS_(lockvar1, lockvar2) \
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do { \
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if (lockvar1 && lockvar2 && lockvar1 > lockvar2) { \
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void *tmp = lockvar1; \
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lockvar1 = lockvar2; \
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lockvar2 = tmp; \
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} \
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} while (0)
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/** Lock an event_base, if it is set up for locking. Acquires the lock
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in the base structure whose field is named 'lockvar'. */
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#define EVBASE_ACQUIRE_LOCK(base, lockvar) do { \
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EVLOCK_LOCK((base)->lockvar, 0); \
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} while (0)
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/** Unlock an event_base, if it is set up for locking. */
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#define EVBASE_RELEASE_LOCK(base, lockvar) do { \
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EVLOCK_UNLOCK((base)->lockvar, 0); \
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} while (0)
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/** If lock debugging is enabled, and lock is non-null, assert that 'lock' is
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* locked and held by us. */
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#define EVLOCK_ASSERT_LOCKED(lock) \
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do { \
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if ((lock) && evthread_lock_debugging_enabled_) { \
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EVUTIL_ASSERT(evthread_is_debug_lock_held_(lock)); \
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} \
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} while (0)
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/** Try to grab the lock for 'lockvar' without blocking, and return 1 if we
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* manage to get it. */
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static inline int EVLOCK_TRY_LOCK_(void *lock);
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static inline int
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EVLOCK_TRY_LOCK_(void *lock)
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{
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if (lock && evthread_lock_fns_.lock) {
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int r = evthread_lock_fns_.lock(EVTHREAD_TRY, lock);
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return !r;
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} else {
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/* Locking is disabled either globally or for this thing;
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* of course we count as having the lock. */
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return 1;
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}
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}
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/** Allocate a new condition variable and store it in the void *, condvar */
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#define EVTHREAD_ALLOC_COND(condvar) \
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do { \
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(condvar) = evthread_cond_fns_.alloc_condition ? \
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evthread_cond_fns_.alloc_condition(0) : NULL; \
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} while (0)
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/** Deallocate and free a condition variable in condvar */
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#define EVTHREAD_FREE_COND(cond) \
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do { \
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if (cond) \
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evthread_cond_fns_.free_condition((cond)); \
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} while (0)
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/** Signal one thread waiting on cond */
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#define EVTHREAD_COND_SIGNAL(cond) \
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( (cond) ? evthread_cond_fns_.signal_condition((cond), 0) : 0 )
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/** Signal all threads waiting on cond */
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#define EVTHREAD_COND_BROADCAST(cond) \
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( (cond) ? evthread_cond_fns_.signal_condition((cond), 1) : 0 )
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/** Wait until the condition 'cond' is signalled. Must be called while
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* holding 'lock'. The lock will be released until the condition is
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* signalled, at which point it will be acquired again. Returns 0 for
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* success, -1 for failure. */
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#define EVTHREAD_COND_WAIT(cond, lock) \
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( (cond) ? evthread_cond_fns_.wait_condition((cond), (lock), NULL) : 0 )
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/** As EVTHREAD_COND_WAIT, but gives up after 'tv' has elapsed. Returns 1
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* on timeout. */
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#define EVTHREAD_COND_WAIT_TIMED(cond, lock, tv) \
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( (cond) ? evthread_cond_fns_.wait_condition((cond), (lock), (tv)) : 0 )
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/** True iff locking functions have been configured. */
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#define EVTHREAD_LOCKING_ENABLED() \
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(evthread_lock_fns_.lock != NULL)
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#elif ! defined(EVENT__DISABLE_THREAD_SUPPORT)
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unsigned long evthreadimpl_get_id_(void);
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int evthreadimpl_is_lock_debugging_enabled_(void);
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void *evthreadimpl_lock_alloc_(unsigned locktype);
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void evthreadimpl_lock_free_(void *lock, unsigned locktype);
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int evthreadimpl_lock_lock_(unsigned mode, void *lock);
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int evthreadimpl_lock_unlock_(unsigned mode, void *lock);
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void *evthreadimpl_cond_alloc_(unsigned condtype);
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void evthreadimpl_cond_free_(void *cond);
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int evthreadimpl_cond_signal_(void *cond, int broadcast);
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int evthreadimpl_cond_wait_(void *cond, void *lock, const struct timeval *tv);
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int evthreadimpl_locking_enabled_(void);
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#define EVTHREAD_GET_ID() evthreadimpl_get_id_()
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#define EVBASE_IN_THREAD(base) \
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((base)->th_owner_id == evthreadimpl_get_id_())
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#define EVBASE_NEED_NOTIFY(base) \
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((base)->running_loop && \
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((base)->th_owner_id != evthreadimpl_get_id_()))
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#define EVTHREAD_ALLOC_LOCK(lockvar, locktype) \
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((lockvar) = evthreadimpl_lock_alloc_(locktype))
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#define EVTHREAD_FREE_LOCK(lockvar, locktype) \
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do { \
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void *lock_tmp_ = (lockvar); \
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if (lock_tmp_) \
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evthreadimpl_lock_free_(lock_tmp_, (locktype)); \
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} while (0)
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/** Acquire a lock. */
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#define EVLOCK_LOCK(lockvar,mode) \
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do { \
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if (lockvar) \
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evthreadimpl_lock_lock_(mode, lockvar); \
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} while (0)
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/** Release a lock */
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#define EVLOCK_UNLOCK(lockvar,mode) \
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do { \
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if (lockvar) \
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evthreadimpl_lock_unlock_(mode, lockvar); \
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} while (0)
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/** Lock an event_base, if it is set up for locking. Acquires the lock
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in the base structure whose field is named 'lockvar'. */
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#define EVBASE_ACQUIRE_LOCK(base, lockvar) do { \
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EVLOCK_LOCK((base)->lockvar, 0); \
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} while (0)
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/** Unlock an event_base, if it is set up for locking. */
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#define EVBASE_RELEASE_LOCK(base, lockvar) do { \
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EVLOCK_UNLOCK((base)->lockvar, 0); \
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} while (0)
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/** If lock debugging is enabled, and lock is non-null, assert that 'lock' is
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* locked and held by us. */
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#define EVLOCK_ASSERT_LOCKED(lock) \
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do { \
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if ((lock) && evthreadimpl_is_lock_debugging_enabled_()) { \
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EVUTIL_ASSERT(evthread_is_debug_lock_held_(lock)); \
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} \
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} while (0)
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/** Try to grab the lock for 'lockvar' without blocking, and return 1 if we
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* manage to get it. */
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static inline int EVLOCK_TRY_LOCK_(void *lock);
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static inline int
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EVLOCK_TRY_LOCK_(void *lock)
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{
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if (lock) {
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int r = evthreadimpl_lock_lock_(EVTHREAD_TRY, lock);
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return !r;
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} else {
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/* Locking is disabled either globally or for this thing;
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* of course we count as having the lock. */
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return 1;
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}
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}
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/** Allocate a new condition variable and store it in the void *, condvar */
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#define EVTHREAD_ALLOC_COND(condvar) \
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do { \
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(condvar) = evthreadimpl_cond_alloc_(0); \
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} while (0)
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/** Deallocate and free a condition variable in condvar */
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#define EVTHREAD_FREE_COND(cond) \
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do { \
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if (cond) \
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evthreadimpl_cond_free_((cond)); \
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} while (0)
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/** Signal one thread waiting on cond */
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#define EVTHREAD_COND_SIGNAL(cond) \
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( (cond) ? evthreadimpl_cond_signal_((cond), 0) : 0 )
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/** Signal all threads waiting on cond */
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#define EVTHREAD_COND_BROADCAST(cond) \
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( (cond) ? evthreadimpl_cond_signal_((cond), 1) : 0 )
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/** Wait until the condition 'cond' is signalled. Must be called while
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* holding 'lock'. The lock will be released until the condition is
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* signalled, at which point it will be acquired again. Returns 0 for
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* success, -1 for failure. */
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#define EVTHREAD_COND_WAIT(cond, lock) \
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( (cond) ? evthreadimpl_cond_wait_((cond), (lock), NULL) : 0 )
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/** As EVTHREAD_COND_WAIT, but gives up after 'tv' has elapsed. Returns 1
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* on timeout. */
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#define EVTHREAD_COND_WAIT_TIMED(cond, lock, tv) \
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( (cond) ? evthreadimpl_cond_wait_((cond), (lock), (tv)) : 0 )
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#define EVTHREAD_LOCKING_ENABLED() \
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(evthreadimpl_locking_enabled_())
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#else /* EVENT__DISABLE_THREAD_SUPPORT */
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#define EVTHREAD_GET_ID() 1
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#define EVTHREAD_ALLOC_LOCK(lockvar, locktype) EVUTIL_NIL_STMT_
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#define EVTHREAD_FREE_LOCK(lockvar, locktype) EVUTIL_NIL_STMT_
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#define EVLOCK_LOCK(lockvar, mode) EVUTIL_NIL_STMT_
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#define EVLOCK_UNLOCK(lockvar, mode) EVUTIL_NIL_STMT_
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#define EVLOCK_LOCK2(lock1,lock2,mode1,mode2) EVUTIL_NIL_STMT_
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#define EVLOCK_UNLOCK2(lock1,lock2,mode1,mode2) EVUTIL_NIL_STMT_
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#define EVBASE_IN_THREAD(base) 1
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#define EVBASE_NEED_NOTIFY(base) 0
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#define EVBASE_ACQUIRE_LOCK(base, lock) EVUTIL_NIL_STMT_
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#define EVBASE_RELEASE_LOCK(base, lock) EVUTIL_NIL_STMT_
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#define EVLOCK_ASSERT_LOCKED(lock) EVUTIL_NIL_STMT_
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#define EVLOCK_TRY_LOCK_(lock) 1
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#define EVTHREAD_ALLOC_COND(condvar) EVUTIL_NIL_STMT_
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#define EVTHREAD_FREE_COND(cond) EVUTIL_NIL_STMT_
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#define EVTHREAD_COND_SIGNAL(cond) EVUTIL_NIL_STMT_
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#define EVTHREAD_COND_BROADCAST(cond) EVUTIL_NIL_STMT_
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#define EVTHREAD_COND_WAIT(cond, lock) EVUTIL_NIL_STMT_
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#define EVTHREAD_COND_WAIT_TIMED(cond, lock, howlong) EVUTIL_NIL_STMT_
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#define EVTHREAD_LOCKING_ENABLED() 0
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#endif
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/* This code is shared between both lock impls */
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#if ! defined(EVENT__DISABLE_THREAD_SUPPORT)
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/** Helper: put lockvar1 and lockvar2 into pointerwise ascending order. */
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#define EVLOCK_SORTLOCKS_(lockvar1, lockvar2) \
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do { \
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if (lockvar1 && lockvar2 && lockvar1 > lockvar2) { \
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void *tmp = lockvar1; \
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lockvar1 = lockvar2; \
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lockvar2 = tmp; \
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} \
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} while (0)
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/** Acquire both lock1 and lock2. Always allocates locks in the same order,
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* so that two threads locking two locks with LOCK2 will not deadlock. */
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#define EVLOCK_LOCK2(lock1,lock2,mode1,mode2) \
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do { \
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void *lock1_tmplock_ = (lock1); \
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void *lock2_tmplock_ = (lock2); \
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EVLOCK_SORTLOCKS_(lock1_tmplock_,lock2_tmplock_); \
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EVLOCK_LOCK(lock1_tmplock_,mode1); \
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if (lock2_tmplock_ != lock1_tmplock_) \
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EVLOCK_LOCK(lock2_tmplock_,mode2); \
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} while (0)
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/** Release both lock1 and lock2. */
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#define EVLOCK_UNLOCK2(lock1,lock2,mode1,mode2) \
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do { \
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void *lock1_tmplock_ = (lock1); \
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void *lock2_tmplock_ = (lock2); \
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EVLOCK_SORTLOCKS_(lock1_tmplock_,lock2_tmplock_); \
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if (lock2_tmplock_ != lock1_tmplock_) \
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EVLOCK_UNLOCK(lock2_tmplock_,mode2); \
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EVLOCK_UNLOCK(lock1_tmplock_,mode1); \
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} while (0)
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int evthread_is_debug_lock_held_(void *lock);
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void *evthread_debug_get_real_lock_(void *lock);
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void *evthread_setup_global_lock_(void *lock_, unsigned locktype,
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int enable_locks);
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#define EVTHREAD_SETUP_GLOBAL_LOCK(lockvar, locktype) \
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do { \
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lockvar = evthread_setup_global_lock_(lockvar, \
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(locktype), enable_locks); \
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if (!lockvar) { \
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event_warn("Couldn't allocate %s", #lockvar); \
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return -1; \
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} \
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} while (0);
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int event_global_setup_locks_(const int enable_locks);
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int evsig_global_setup_locks_(const int enable_locks);
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int evutil_global_setup_locks_(const int enable_locks);
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int evutil_secure_rng_global_setup_locks_(const int enable_locks);
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/** Return current evthread_lock_callbacks */
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struct evthread_lock_callbacks *evthread_get_lock_callbacks(void);
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/** Return current evthread_condition_callbacks */
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struct evthread_condition_callbacks *evthread_get_condition_callbacks(void);
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/** Disable locking for internal usage (like global shutdown) */
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void evthreadimpl_disable_lock_debugging_(void);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* EVTHREAD_INTERNAL_H_INCLUDED_ */
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