ae.h

   1 /* A simple event-driven programming library. Originally I wrote this code
   2  * for the Jim's event-loop (Jim is a Tcl interpreter) but later translated
   3  * it in form of a library for easy reuse.
   4  *
   5  * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  *   * Redistributions of source code must retain the above copyright notice,
  12  *     this list of conditions and the following disclaimer.
  13  *   * Redistributions in binary form must reproduce the above copyright
  14  *     notice, this list of conditions and the following disclaimer in the
  15  *     documentation and/or other materials provided with the distribution.
  16  *   * Neither the name of Redis nor the names of its contributors may be used
  17  *     to endorse or promote products derived from this software without
  18  *     specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #ifndef __AE_H__
  34 #define __AE_H__
  35
  36 #define AE_SETSIZE (1024*10)    /* Max number of fd supported */
  37
  38 #define AE_OK 0
  39 #define AE_ERR -1
  40
  41 #define AE_NONE 0
  42 #define AE_READABLE 1
  43 #define AE_WRITABLE 2
  44
  45 #define AE_FILE_EVENTS 1
  46 #define AE_TIME_EVENTS 2
  47 #define AE_ALL_EVENTS (AE_FILE_EVENTS|AE_TIME_EVENTS)
  48 #define AE_DONT_WAIT 4
  49
  50 #define AE_NOMORE -1
  51
  52 /* Macros */
  53 #define AE_NOTUSED(V) ((void) V)
  54
  55 struct aeEventLoop;
  56
  57 /* Types and data structures */
  58 typedef void aeFileProc(struct aeEventLoop *eventLoop, int fd, void *clientData, int mask);
  59 typedef int aeTimeProc(struct aeEventLoop *eventLoop, long long id, void *clientData);
  60 typedef void aeEventFinalizerProc(struct aeEventLoop *eventLoop, void *clientData);
  61
  62 /* File event structure */
  63 typedef struct aeFileEvent {
  64     int mask; /* one of AE_(READABLE|WRITABLE) */
  65     aeFileProc *rfileProc;
  66     aeFileProc *wfileProc;
  67     void *clientData;
  68 } aeFileEvent;
  69
  70 /* Time event structure */
  71 typedef struct aeTimeEvent {
  72     long long id; /* time event identifier. */
  73     long when_sec; /* seconds */
  74     long when_ms; /* milliseconds */
  75     aeTimeProc *timeProc;
  76     aeEventFinalizerProc *finalizerProc;
  77     void *clientData;
  78     struct aeTimeEvent *next;
  79 } aeTimeEvent;
  80
  81 /* A fired event */
  82 typedef struct aeFiredEvent {
  83     int fd;
  84     int mask;
  85 } aeFiredEvent;
  86
  87 /* State of an event based program */
  88 typedef struct aeEventLoop {
  89     int maxfd;
  90     long long timeEventNextId;
  91     aeFileEvent events[AE_SETSIZE]; /* Registered events */
  92     aeFiredEvent fired[AE_SETSIZE]; /* Fired events */
  93     aeTimeEvent *timeEventHead;
  94     int stop;
  95     void *apidata; /* This is used for polling API specific data */
  96 } aeEventLoop;
  97
  98 /* Prototypes */
  99 aeEventLoop *aeCreateEventLoop(void);
 100 void aeDeleteEventLoop(aeEventLoop *eventLoop);
 101 void aeStop(aeEventLoop *eventLoop);
 102 int aeCreateFileEvent(aeEventLoop *eventLoop, int fd, int mask,
 103         aeFileProc *proc, void *clientData);
 104 void aeDeleteFileEvent(aeEventLoop *eventLoop, int fd, int mask);
 105 long long aeCreateTimeEvent(aeEventLoop *eventLoop, long long milliseconds,
 106         aeTimeProc *proc, void *clientData,
 107         aeEventFinalizerProc *finalizerProc);
 108 int aeDeleteTimeEvent(aeEventLoop *eventLoop, long long id);
 109 int aeProcessEvents(aeEventLoop *eventLoop, int flags);
 110 int aeWait(int fd, int mask, long long milliseconds);
 111 void aeMain(aeEventLoop *eventLoop);
 112 char *aeGetApiName(void);
 113
 114 #endif