external/bsd/ntp/dist/lib/isc/pthreads/condition.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 1998-2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: condition.c,v 1.36 2007/06/19 23:47:18 tbox Exp */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <errno.h>
  27
  28 #include <isc/condition.h>
  29 #include <isc/msgs.h>
  30 #include <isc/strerror.h>
  31 #include <isc/string.h>
  32 #include <isc/time.h>
  33 #include <isc/util.h>
  34
  35 isc_result_t
  36 isc_condition_waituntil(isc_condition_t *c, isc_mutex_t *m, isc_time_t *t) {
  37         int presult;
  38         isc_result_t result;
  39         struct timespec ts;
  40         char strbuf[ISC_STRERRORSIZE];
  41
  42         REQUIRE(c != NULL && m != NULL && t != NULL);
  43
  44         /*
  45          * POSIX defines a timespec's tv_sec as time_t.
  46          */
  47         result = isc_time_secondsastimet(t, &ts.tv_sec);
  48         if (result != ISC_R_SUCCESS)
  49                 return (result);
  50
  51         /*!
  52          * POSIX defines a timespec's tv_nsec as long.  isc_time_nanoseconds
  53          * ensures its return value is < 1 billion, which will fit in a long.
  54          */
  55         ts.tv_nsec = (long)isc_time_nanoseconds(t);
  56
  57         do {
  58 #if ISC_MUTEX_PROFILE
  59                 presult = pthread_cond_timedwait(c, &m->mutex, &ts);
  60 #else
  61                 presult = pthread_cond_timedwait(c, m, &ts);
  62 #endif
  63                 if (presult == 0)
  64                         return (ISC_R_SUCCESS);
  65                 if (presult == ETIMEDOUT)
  66                         return (ISC_R_TIMEDOUT);
  67         } while (presult == EINTR);
  68
  69         isc__strerror(presult, strbuf, sizeof(strbuf));
  70         UNEXPECTED_ERROR(__FILE__, __LINE__,
  71                          "pthread_cond_timedwait() %s %s",
  72                          isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
  73                                         ISC_MSG_RETURNED, "returned"),
  74                          strbuf);
  75         return (ISC_R_UNEXPECTED);
  76 }