src/condvar.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2010 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     *p = (YAZ_COND) malloc(sizeof(**p));
  52 #ifdef WIN32
  53     InitializeConditionVariable(&(*p)->cond);
  54 #elif YAZ_POSIX_THREADS
  55     pthread_cond_init(&(*p)->cond, 0);
  56 #endif
  57 }
  58
  59 void yaz_cond_destroy(YAZ_COND *p)
  60 {
  61     if (*p)
  62     {
  63 #ifdef WIN32
  64 #elif YAZ_POSIX_THREADS
  65         pthread_cond_destroy(&(*p)->cond);
  66 #endif
  67         free(*p);
  68         *p = 0;
  69     }
  70 }
  71
  72 int yaz_cond_wait(YAZ_COND p, YAZ_MUTEX m, const struct timeval *abstime)
  73 {
  74 #ifdef WIN32
  75     BOOL v;
  76     if (abstime)
  77     {
  78         struct timeval tval_now;
  79         int sec, msec;
  80
  81         yaz_gettimeofday(&tval_now);
  82
  83         sec = abstime->tv_sec - tval_now.tv_sec;
  84         msec = (abstime->tv_usec - tval_now.tv_usec) / 1000;
  85         v = SleepConditionVariableCS(&p->cond, &m->handle, sec*1000 + msec);
  86     }
  87     else
  88         v = SleepConditionVariableCS(&p->cond, &m->handle, INFINITE);
  89     return v ? 0 : -1;
  90 #elif YAZ_POSIX_THREADS
  91     if (abstime)
  92     {
  93         struct timespec s;
  94         s.tv_sec = abstime->tv_sec;
  95         s.tv_nsec = abstime->tv_usec * 1000;
  96         return pthread_cond_timedwait(&p->cond, &m->handle, &s);
  97     }
  98     else
  99         return pthread_cond_wait(&p->cond, &m->handle);
 100 #else
 101     return -1;
 102 #endif
 103 }
 104
 105 int yaz_cond_signal(YAZ_COND p)
 106 {
 107 #ifdef WIN32
 108     WakeConditionVariable(&p->cond);
 109     return 0;
 110 #elif YAZ_POSIX_THREADS
 111     return pthread_cond_signal(&p->cond);
 112 #else
 113     return -1;
 114 #endif
 115 }
 116
 117 int yaz_cond_broadcast(YAZ_COND p)
 118 {
 119 #ifdef WIN32
 120     WakeAllConditionVariable(&p->cond);
 121     return 0;
 122 #elif YAZ_POSIX_THREADS
 123     return pthread_cond_broadcast(&p->cond);
 124 #else
 125     return -1;
 126 #endif
 127 }
 128
 129 /*
 130  * Local variables:
 131  * c-basic-offset: 4
 132  * c-file-style: "Stroustrup"
 133  * indent-tabs-mode: nil
 134  * End:
 135  * vim: shiftwidth=4 tabstop=8 expandtab
 136  */
 137