root/opal/mca/event/libevent2022/libevent/sample/time-test.c

DEFINITIONS

1. timeout_cb
2. main

   1 /*
   2  * XXX This sample code was once meant to show how to use the basic Libevent
   3  * interfaces, but it never worked on non-Unix platforms, and some of the
   4  * interfaces have changed since it was first written.  It should probably
   5  * be removed or replaced with something better.
   6  *
   7  * Compile with:
   8  * cc -I/usr/local/include -o time-test time-test.c -L/usr/local/lib -levent
   9  */
  10 
  11 #include <sys/types.h>
  12 
  13 #include <event2/event-config.h>
  14 
  15 #include <sys/stat.h>
  16 #ifndef WIN32
  17 #include <sys/queue.h>
  18 #include <unistd.h>
  19 #endif
  20 #include <time.h>
  21 #ifdef _EVENT_HAVE_SYS_TIME_H
  22 #include <sys/time.h>
  23 #endif
  24 #include <fcntl.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <errno.h>
  29 
  30 #include <event2/event.h>
  31 #include <event2/event_struct.h>
  32 #include <event2/util.h>
  33 
  34 #ifdef WIN32
  35 #include <winsock2.h>
  36 #endif
  37 
  38 struct timeval lasttime;
  39 
  40 int event_is_persistent;
  41 
  42 static void
  43 timeout_cb(evutil_socket_t fd, short event, void *arg)
  44 {
  45         struct timeval newtime, difference;
  46         struct event *timeout = arg;
  47         double elapsed;
  48 
  49         evutil_gettimeofday(&newtime, NULL);
  50         evutil_timersub(&newtime, &lasttime, &difference);
  51         elapsed = difference.tv_sec +
  52             (difference.tv_usec / 1.0e6);
  53 
  54         printf("timeout_cb called at %d: %.3f seconds elapsed.\n",
  55             (int)newtime.tv_sec, elapsed);
  56         lasttime = newtime;
  57 
  58         if (! event_is_persistent) {
  59                 struct timeval tv;
  60                 evutil_timerclear(&tv);
  61                 tv.tv_sec = 2;
  62                 event_add(timeout, &tv);
  63         }
  64 }
  65 
  66 int
  67 main(int argc, char **argv)
  68 {
  69         struct event timeout;
  70         struct timeval tv;
  71         struct event_base *base;
  72         int flags;
  73 
  74 #ifdef WIN32
  75         WORD wVersionRequested;
  76         WSADATA wsaData;
  77 
  78         wVersionRequested = MAKEWORD(2, 2);
  79 
  80         (void)WSAStartup(wVersionRequested, &wsaData);
  81 #endif
  82 
  83         if (argc == 2 && !strcmp(argv[1], "-p")) {
  84                 event_is_persistent = 1;
  85                 flags = EV_PERSIST;
  86         } else {
  87                 event_is_persistent = 0;
  88                 flags = 0;
  89         }
  90 
  91         /* Initalize the event library */
  92         base = event_base_new();
  93 
  94         /* Initalize one event */
  95         event_assign(&timeout, base, -1, flags, timeout_cb, (void*) &timeout);
  96 
  97         evutil_timerclear(&tv);
  98         tv.tv_sec = 2;
  99         event_add(&timeout, &tv);
 100 
 101         evutil_gettimeofday(&lasttime, NULL);
 102 
 103         event_base_dispatch(base);
 104 
 105         return (0);
 106 }
 107