161 lines
3.7 KiB
C
161 lines
3.7 KiB
C
/*
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* Copyright (C) 2008-2009 Tobias Brunner
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* Copyright (C) 2008 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#define _GNU_SOURCE
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#include <pthread.h>
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#include <stdint.h>
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#include <time.h>
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#include <errno.h>
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#include <threading.h>
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#include <library.h>
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#include <debug.h>
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#include "condvar.h"
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#include "mutex.h"
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/**
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* Implementation of condvar_t.wait.
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*/
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static void _wait(private_condvar_t *this, private_mutex_t *mutex)
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{
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if (mutex->recursive)
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{
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private_r_mutex_t* recursive = (private_r_mutex_t*)mutex;
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/* mutex owner gets cleared during condvar wait */
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recursive->thread = 0;
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pthread_cond_wait(&this->condvar, &mutex->mutex);
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recursive->thread = pthread_self();
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}
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else
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{
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pthread_cond_wait(&this->condvar, &mutex->mutex);
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}
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}
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/**
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* Implementation of condvar_t.timed_wait_abs.
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*/
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static bool timed_wait_abs(private_condvar_t *this, private_mutex_t *mutex,
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timeval_t time)
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{
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struct timespec ts;
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bool timed_out;
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ts.tv_sec = time.tv_sec;
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ts.tv_nsec = time.tv_usec * 1000;
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if (mutex->recursive)
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{
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private_r_mutex_t* recursive = (private_r_mutex_t*)mutex;
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recursive->thread = 0;
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timed_out = pthread_cond_timedwait(&this->condvar, &mutex->mutex,
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&ts) == ETIMEDOUT;
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recursive->thread = pthread_self();
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}
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else
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{
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timed_out = pthread_cond_timedwait(&this->condvar, &mutex->mutex,
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&ts) == ETIMEDOUT;
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}
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return timed_out;
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}
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/**
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* Implementation of condvar_t.timed_wait.
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*/
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static bool timed_wait(private_condvar_t *this, private_mutex_t *mutex,
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u_int timeout)
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{
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timeval_t tv;
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u_int s, ms;
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time_monotonic(&tv);
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s = timeout / 1000;
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ms = timeout % 1000;
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tv.tv_sec += s;
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tv.tv_usec += ms * 1000;
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if (tv.tv_usec > 1000000 /* 1s */)
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{
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tv.tv_usec -= 1000000;
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tv.tv_sec++;
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}
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return timed_wait_abs(this, mutex, tv);
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}
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/**
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* Implementation of condvar_t.signal.
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*/
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static void _signal(private_condvar_t *this)
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{
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pthread_cond_signal(&this->condvar);
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}
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/**
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* Implementation of condvar_t.broadcast.
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*/
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static void broadcast(private_condvar_t *this)
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{
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pthread_cond_broadcast(&this->condvar);
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}
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/**
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* Implementation of condvar_t.destroy
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*/
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static void condvar_destroy(private_condvar_t *this)
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{
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pthread_cond_destroy(&this->condvar);
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free(this);
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}
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/*
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* see header file
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*/
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condvar_t *condvar_create(condvar_type_t type)
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{
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switch (type)
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{
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case CONDVAR_TYPE_DEFAULT:
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default:
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{
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pthread_condattr_t condattr;
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private_condvar_t *this = malloc_thing(private_condvar_t);
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this->public.wait = (void(*)(condvar_t*, mutex_t *mutex))_wait;
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this->public.timed_wait = (bool(*)(condvar_t*, mutex_t *mutex, u_int timeout))timed_wait;
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this->public.timed_wait_abs = (bool(*)(condvar_t*, mutex_t *mutex, timeval_t time))timed_wait_abs;
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this->public.signal = (void(*)(condvar_t*))_signal;
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this->public.broadcast = (void(*)(condvar_t*))broadcast;
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this->public.destroy = (void(*)(condvar_t*))condvar_destroy;
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pthread_condattr_init(&condattr);
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#ifdef HAVE_CONDATTR_CLOCK_MONOTONIC
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pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
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#endif
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pthread_cond_init(&this->condvar, &condattr);
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pthread_condattr_destroy(&condattr);
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return &this->public;
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}
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}
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}
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