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_OK 0
  37 #define AE_ERR -1
  38
  39 #define AE_NONE 0
  40 #define AE_READABLE 1
  41 #define AE_WRITABLE 2
  42
  43 #define AE_FILE_EVENTS 1
  44 #define AE_TIME_EVENTS 2
  45 #define AE_ALL_EVENTS (AE_FILE_EVENTS|AE_TIME_EVENTS)
  46 #define AE_DONT_WAIT 4
  47
  48 #define AE_NOMORE -1
  49
  50 /* Macros */
  51 #define AE_NOTUSED(V) ((void) V)
  52
  53 struct aeEventLoop;
  54
  55 /* Types and data structures */
  56 typedef void aeFileProc(struct aeEventLoop *eventLoop, int fd, void *clientData, int mask);
  57 typedef int aeTimeProc(struct aeEventLoop *eventLoop, long long id, void *clientData);
  58 typedef void aeEventFinalizerProc(struct aeEventLoop *eventLoop, void *clientData);
  59 typedef void aeBeforeSleepProc(struct aeEventLoop *eventLoop);
  60
  61 /* File event structure */
  62 typedef struct aeFileEvent {
  63     int mask; /* one of AE_(READABLE|WRITABLE) */
  64     aeFileProc *rfileProc;
  65     aeFileProc *wfileProc;
  66     void *clientData;
  67 } aeFileEvent;
  68
  69 /* Time event structure */
  70 typedef struct aeTimeEvent {
  71     long long id; /* time event identifier. */
  72     long when_sec; /* seconds */
  73     long when_ms; /* milliseconds */
  74     aeTimeProc *timeProc;
  75     aeEventFinalizerProc *finalizerProc;
  76     void *clientData;
  77     struct aeTimeEvent *next;
  78 } aeTimeEvent;
  79
  80 /* A fired event */
  81 typedef struct aeFiredEvent {
  82     int fd;
  83     int mask;
  84 } aeFiredEvent;
  85
  86 /* State of an event based program */
  87 typedef struct aeEventLoop {
  88     int maxfd;   /* highest file descriptor currently registered */
  89     int setsize; /* max number of file descriptors tracked */
  90     long long timeEventNextId;
  91     time_t lastTime;     /* Used to detect system clock skew */
  92     aeFileEvent *events; /* Registered events */
  93     aeFiredEvent *fired; /* 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(int setsize);
 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 int aeGetFileEvents(aeEventLoop *eventLoop, int fd);
 108 long long aeCreateTimeEvent(aeEventLoop *eventLoop, long long milliseconds,
 109         aeTimeProc *proc, void *clientData,
 110         aeEventFinalizerProc *finalizerProc);
 111 int aeDeleteTimeEvent(aeEventLoop *eventLoop, long long id);
 112 int aeProcessEvents(aeEventLoop *eventLoop, int flags);
 113 int aeWait(int fd, int mask, long long milliseconds);
 114 void aeMain(aeEventLoop *eventLoop);
 115 char *aeGetApiName(void);
 116 void aeSetBeforeSleepProc(aeEventLoop *eventLoop, aeBeforeSleepProc *beforesleep);
 117
 118 #endif