src/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) 2006-2010, 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 typedef void aeBeforeSleepProc(struct aeEventLoop *eventLoop);
  62
  63 /* File event structure */
  64 typedef struct aeFileEvent {
  65     int mask; /* one of AE_(READABLE|WRITABLE) */
  66     aeFileProc *rfileProc;
  67     aeFileProc *wfileProc;
  68     void *clientData;
  69 } aeFileEvent;
  70
  71 /* Time event structure */
  72 typedef struct aeTimeEvent {
  73     long long id; /* time event identifier. */
  74     long when_sec; /* seconds */
  75     long when_ms; /* milliseconds */
  76     aeTimeProc *timeProc;
  77     aeEventFinalizerProc *finalizerProc;
  78     void *clientData;
  79     struct aeTimeEvent *next;
  80 } aeTimeEvent;
  81
  82 /* A fired event */
  83 typedef struct aeFiredEvent {
  84     int fd;
  85     int mask;
  86 } aeFiredEvent;
  87
  88 /* State of an event based program */
  89 typedef struct aeEventLoop {
  90     int maxfd;
  91     long long timeEventNextId;
  92     aeFileEvent events[AE_SETSIZE]; /* Registered events */
  93     aeFiredEvent fired[AE_SETSIZE]; /* Fired events */
  94     aeTimeEvent *timeEventHead;
  95     int stop;
  96     void *apidata; /* This is used for polling API specific data */
  97     aeBeforeSleepProc *beforesleep;
  98 } aeEventLoop;
  99
 100 /* Prototypes */
 101 aeEventLoop *aeCreateEventLoop(void);
 102 void aeDeleteEventLoop(aeEventLoop *eventLoop);
 103 void aeStop(aeEventLoop *eventLoop);
 104 int aeCreateFileEvent(aeEventLoop *eventLoop, int fd, int mask,
 105         aeFileProc *proc, void *clientData);
 106 void aeDeleteFileEvent(aeEventLoop *eventLoop, int fd, int mask);
 107 long long aeCreateTimeEvent(aeEventLoop *eventLoop, long long milliseconds,
 108         aeTimeProc *proc, void *clientData,
 109         aeEventFinalizerProc *finalizerProc);
 110 int aeDeleteTimeEvent(aeEventLoop *eventLoop, long long id);
 111 int aeProcessEvents(aeEventLoop *eventLoop, int flags);
 112 int aeWait(int fd, int mask, long long milliseconds);
 113 void aeMain(aeEventLoop *eventLoop);
 114 char *aeGetApiName(void);
 115 void aeSetBeforeSleepProc(aeEventLoop *eventLoop, aeBeforeSleepProc *beforesleep);
 116
 117 #endif