lib/timer.c

   1 /*
   2  * Copyright (c) 2011, 2013 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18
  19 #include "timer.h"
  20
  21 #include "openvswitch/poll-loop.h"
  22 #include "timeval.h"
  23
  24 /* Returns the number of milliseconds until 'timer' expires. */
  25 long long int
  26 timer_msecs_until_expired(const struct timer *timer)
  27 {
  28     switch (timer->t) {
  29     case LLONG_MAX: return LLONG_MAX;
  30     case LLONG_MIN: return 0;
  31     default: return timer->t - time_msec();
  32     }
  33 }
  34
  35 /* Causes poll_block() to wake when 'timer' expires.
  36  *
  37  * ('where' is used in debug logging.  Commonly one would use timer_wait() to
  38  * automatically provide the caller's source file and line number for
  39  * 'where'.) */
  40 void
  41 timer_wait_at(const struct timer *timer, const char *where)
  42 {
  43     if (timer->t < LLONG_MAX) {
  44         poll_timer_wait_until_at(timer->t, where);
  45     }
  46 }