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event_compat.h
/* * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu> * Copyright (c) 2007-2012 Niels Provos and 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 EVENT2_EVENT_COMPAT_H_INCLUDED_ #define EVENT2_EVENT_COMPAT_H_INCLUDED_ /** @file event2/event_compat.h Potentially non-threadsafe versions of the functions in event.h: provided only for backwards compatibility. In the oldest versions of Libevent, event_base was not a first-class structure. Instead, there was a single event base that every function manipulated. Later, when separate event bases were added, the old functions that didn't take an event_base argument needed to work by manipulating the "current" event base. This could lead to thread-safety issues, and obscure, hard-to-diagnose bugs. @deprecated All functions in this file are by definition deprecated. */ #include <event2/visibility.h> #ifdef __cplusplus extern "C" { #endif #include <event2/event-config.h> #ifdef EVENT__HAVE_SYS_TYPES_H #include <sys/types.h> #endif #ifdef EVENT__HAVE_SYS_TIME_H #include <sys/time.h> #endif /* For int types. */ #include <event2/util.h> /** Initialize the event API. The event API needs to be initialized with event_init() before it can be used. Sets the global current base that gets used for events that have no base associated with them. @deprecated This function is deprecated because it replaces the "current" event_base, and is totally unsafe for multithreaded use. The replacement is event_base_new(). @see event_base_set(), event_base_new() */ EVENT2_EXPORT_SYMBOL struct event_base *event_init(void); /** Loop to process events. Like event_base_dispatch(), but uses the "current" base. @deprecated This function is deprecated because it is easily confused by multiple calls to event_init(), and because it is not safe for multithreaded use. The replacement is event_base_dispatch(). @see event_base_dispatch(), event_init() */ EVENT2_EXPORT_SYMBOL int event_dispatch(void); /** Handle events. This function behaves like event_base_loop(), but uses the "current" base @deprecated This function is deprecated because it uses the event base from the last call to event_init, and is therefore not safe for multithreaded use. The replacement is event_base_loop(). @see event_base_loop(), event_init() */ EVENT2_EXPORT_SYMBOL int event_loop(int); /** Exit the event loop after the specified time. This function behaves like event_base_loopexit(), except that it uses the "current" base. @deprecated This function is deprecated because it uses the event base from the last call to event_init, and is therefore not safe for multithreaded use. The replacement is event_base_loopexit(). @see event_init, event_base_loopexit() */ EVENT2_EXPORT_SYMBOL int event_loopexit(const struct timeval *); /** Abort the active event_loop() immediately. This function behaves like event_base_loopbreakt(), except that it uses the "current" base. @deprecated This function is deprecated because it uses the event base from the last call to event_init, and is therefore not safe for multithreaded use. The replacement is event_base_loopbreak(). @see event_base_loopbreak(), event_init() */ EVENT2_EXPORT_SYMBOL int event_loopbreak(void); /** Schedule a one-time event to occur. @deprecated This function is obsolete, and has been replaced by event_base_once(). Its use is deprecated because it relies on the "current" base configured by event_init(). @see event_base_once() */ EVENT2_EXPORT_SYMBOL int event_once(evutil_socket_t , short, void (*)(evutil_socket_t, short, void *), void *, const struct timeval *); /** Get the kernel event notification mechanism used by Libevent. @deprecated This function is obsolete, and has been replaced by event_base_get_method(). Its use is deprecated because it relies on the "current" base configured by event_init(). @see event_base_get_method() */ EVENT2_EXPORT_SYMBOL const char *event_get_method(void); /** Set the number of different event priorities. @deprecated This function is deprecated because it is easily confused by multiple calls to event_init(), and because it is not safe for multithreaded use. The replacement is event_base_priority_init(). @see event_base_priority_init() */ EVENT2_EXPORT_SYMBOL int event_priority_init(int); /** Prepare an event structure to be added. @deprecated event_set() is not recommended for new code, because it requires a subsequent call to event_base_set() to be safe under most circumstances. Use event_assign() or event_new() instead. */ EVENT2_EXPORT_SYMBOL void event_set(struct event *, evutil_socket_t, short, void (*)(evutil_socket_t, short, void *), void *); #define evtimer_set(ev, cb, arg) event_set((ev), -1, 0, (cb), (arg)) #define evsignal_set(ev, x, cb, arg) \ event_set((ev), (x), EV_SIGNAL|EV_PERSIST, (cb), (arg)) /** @name timeout_* macros @deprecated These macros are deprecated because their naming is inconsistent with the rest of Libevent. Use the evtimer_* macros instead. @{ */ #define timeout_add(ev, tv) event_add((ev), (tv)) #define timeout_set(ev, cb, arg) event_set((ev), -1, 0, (cb), (arg)) #define timeout_del(ev) event_del(ev) #define timeout_pending(ev, tv) event_pending((ev), EV_TIMEOUT, (tv)) #define timeout_initialized(ev) event_initialized(ev) /**@}*/ /** @name signal_* macros @deprecated These macros are deprecated because their naming is inconsistent with the rest of Libevent. Use the evsignal_* macros instead. @{ */ #define signal_add(ev, tv) event_add((ev), (tv)) #define signal_set(ev, x, cb, arg) \ event_set((ev), (x), EV_SIGNAL|EV_PERSIST, (cb), (arg)) #define signal_del(ev) event_del(ev) #define signal_pending(ev, tv) event_pending((ev), EV_SIGNAL, (tv)) #define signal_initialized(ev) event_initialized(ev) /**@}*/ #ifndef EVENT_FD /* These macros are obsolete; use event_get_fd and event_get_signal instead. */ #define EVENT_FD(ev) ((int)event_get_fd(ev)) #define EVENT_SIGNAL(ev) event_get_signal(ev) #endif #ifdef __cplusplus } #endif #endif /* EVENT2_EVENT_COMPAT_H_INCLUDED_ */
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