src/condvar.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2011 Index Data
   3  * See the file LICENSE for details.
   4  */
   5
   6 /**
   7  * \file condvar.c
   8  * \brief Wraps condition variables
   9  *
  10  */
  11 #if HAVE_CONFIG_H
  12 #include <config.h>
  13 #endif
  14
  15 #include <assert.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <yaz/xmalloc.h>
  21 #include <yaz/nmem.h>
  22 #include <yaz/log.h>
  23 #include <yaz/mutex.h>
  24 #include <yaz/gettimeofday.h>
  25 #ifdef WIN32
  26 #include <windows.h>
  27 #include <sys/timeb.h>
  28 #endif
  29 #include <time.h>
  30
  31 #if HAVE_SYS_TIME_H
  32 #include <sys/time.h>
  33 #endif
  34
  35 #if YAZ_POSIX_THREADS
  36 #include <pthread.h>
  37 #endif
  38
  39 #include "mutex-p.h"
  40
  41 struct yaz_cond {
  42 #ifdef WIN32
  43     CONDITION_VARIABLE cond;
  44 #elif YAZ_POSIX_THREADS
  45     pthread_cond_t cond;
  46 #endif
  47 };
  48
  49 void yaz_cond_create(YAZ_COND *p)
  50 {
  51 #ifdef WIN32
  52     *p = (YAZ_COND) malloc(sizeof(**p));
  53     InitializeConditionVariable(&(*p)->cond);
  54 #elif YAZ_POSIX_THREADS
  55     *p = (YAZ_COND) malloc(sizeof(**p));
  56     pthread_cond_init(&(*p)->cond, 0);
  57 #else
  58     *p = 0;
  59 #endif
  60 }
  61
  62 void yaz_cond_destroy(YAZ_COND *p)
  63 {
  64     if (*p)
  65     {
  66 #ifdef WIN32
  67 #elif YAZ_POSIX_THREADS
  68         pthread_cond_destroy(&(*p)->cond);
  69 #endif
  70         free(*p);
  71         *p = 0;
  72     }
  73 }
  74
  75 int yaz_cond_wait(YAZ_COND p, YAZ_MUTEX m, const struct timeval *abstime)
  76 {
  77 #ifdef WIN32
  78     BOOL v;
  79     if (abstime)
  80     {
  81         struct timeval tval_now;
  82         int sec, msec;
  83
  84         yaz_gettimeofday(&tval_now);
  85
  86         sec = abstime->tv_sec - tval_now.tv_sec;
  87         msec = (abstime->tv_usec - tval_now.tv_usec) / 1000;
  88         v = SleepConditionVariableCS(&p->cond, &m->handle, sec*1000 + msec);
  89     }
  90     else
  91         v = SleepConditionVariableCS(&p->cond, &m->handle, INFINITE);
  92     return v ? 0 : -1;
  93 #elif YAZ_POSIX_THREADS
  94     if (abstime)
  95     {
  96         struct timespec s;
  97         s.tv_sec = abstime->tv_sec;
  98         s.tv_nsec = abstime->tv_usec * 1000;
  99         return pthread_cond_timedwait(&p->cond, &m->handle, &s);
 100     }
 101     else
 102         return pthread_cond_wait(&p->cond, &m->handle);
 103 #else
 104     return -1;
 105 #endif
 106 }
 107
 108 int yaz_cond_signal(YAZ_COND p)
 109 {
 110 #ifdef WIN32
 111     WakeConditionVariable(&p->cond);
 112     return 0;
 113 #elif YAZ_POSIX_THREADS
 114     return pthread_cond_signal(&p->cond);
 115 #else
 116     return -1;
 117 #endif
 118 }
 119
 120 int yaz_cond_broadcast(YAZ_COND p)
 121 {
 122 #ifdef WIN32
 123     WakeAllConditionVariable(&p->cond);
 124     return 0;
 125 #elif YAZ_POSIX_THREADS
 126     return pthread_cond_broadcast(&p->cond);
 127 #else
 128     return -1;
 129 #endif
 130 }
 131
 132 /*
 133  * Local variables:
 134  * c-basic-offset: 4
 135  * c-file-style: "Stroustrup"
 136  * indent-tabs-mode: nil
 137  * End:
 138  * vim: shiftwidth=4 tabstop=8 expandtab
 139  */
 140