352 lines
6.6 KiB
C
352 lines
6.6 KiB
C
/*
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* Copyright (C) 2008-2012 Tobias Brunner
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* Copyright (C) 2008 Martin Willi
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* HSR 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 <library.h>
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#include <utils/debug.h>
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#include "thread.h"
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#include "condvar.h"
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#include "mutex.h"
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#include "lock_profiler.h"
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typedef struct private_mutex_t private_mutex_t;
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typedef struct private_r_mutex_t private_r_mutex_t;
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typedef struct private_condvar_t private_condvar_t;
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/**
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* private data of mutex
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*/
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struct private_mutex_t {
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/**
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* public functions
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*/
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mutex_t public;
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/**
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* wrapped pthread mutex
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*/
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pthread_mutex_t mutex;
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/**
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* is this a recursive mutex, implementing private_r_mutex_t?
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*/
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bool recursive;
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/**
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* profiling info, if enabled
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*/
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lock_profile_t profile;
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};
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/**
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* private data of mutex, extended by recursive locking information
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*/
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struct private_r_mutex_t {
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/**
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* Extends private_mutex_t
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*/
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private_mutex_t generic;
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/**
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* thread which currently owns mutex
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*/
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thread_t *thread;
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/**
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* times the current thread locked the mutex
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*/
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u_int times;
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};
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/**
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* private data of condvar
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*/
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struct private_condvar_t {
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/**
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* public functions
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*/
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condvar_t public;
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/**
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* wrapped pthread condvar
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*/
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pthread_cond_t condvar;
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};
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METHOD(mutex_t, lock, void,
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private_mutex_t *this)
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{
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int err;
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profiler_start(&this->profile);
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err = pthread_mutex_lock(&this->mutex);
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if (err)
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{
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DBG1(DBG_LIB, "!!! MUTEX LOCK ERROR: %s !!!", strerror(err));
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}
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profiler_end(&this->profile);
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}
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METHOD(mutex_t, unlock, void,
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private_mutex_t *this)
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{
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int err;
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err = pthread_mutex_unlock(&this->mutex);
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if (err)
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{
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DBG1(DBG_LIB, "!!! MUTEX UNLOCK ERROR: %s !!!", strerror(err));
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}
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}
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METHOD(mutex_t, lock_r, void,
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private_r_mutex_t *this)
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{
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thread_t *self = thread_current();
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if (cas_ptr(&this->thread, self, self))
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{
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this->times++;
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}
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else
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{
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lock(&this->generic);
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cas_ptr(&this->thread, NULL, self);
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this->times = 1;
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}
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}
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METHOD(mutex_t, unlock_r, void,
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private_r_mutex_t *this)
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{
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if (--this->times == 0)
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{
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cas_ptr(&this->thread, thread_current(), NULL);
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unlock(&this->generic);
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}
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}
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METHOD(mutex_t, mutex_destroy, void,
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private_mutex_t *this)
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{
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profiler_cleanup(&this->profile);
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pthread_mutex_destroy(&this->mutex);
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free(this);
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}
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METHOD(mutex_t, mutex_destroy_r, void,
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private_r_mutex_t *this)
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{
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profiler_cleanup(&this->generic.profile);
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pthread_mutex_destroy(&this->generic.mutex);
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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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mutex_t *mutex_create(mutex_type_t type)
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{
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switch (type)
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{
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case MUTEX_TYPE_RECURSIVE:
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{
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private_r_mutex_t *this;
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INIT(this,
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.generic = {
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.public = {
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.lock = _lock_r,
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.unlock = _unlock_r,
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.destroy = _mutex_destroy_r,
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},
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.recursive = TRUE,
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},
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);
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pthread_mutex_init(&this->generic.mutex, NULL);
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profiler_init(&this->generic.profile);
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return &this->generic.public;
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}
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case MUTEX_TYPE_DEFAULT:
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default:
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{
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private_mutex_t *this;
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INIT(this,
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.public = {
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.lock = _lock,
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.unlock = _unlock,
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.destroy = _mutex_destroy,
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},
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);
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pthread_mutex_init(&this->mutex, NULL);
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profiler_init(&this->profile);
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return &this->public;
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}
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}
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}
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METHOD(condvar_t, wait_, void,
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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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thread_t *self = thread_current();
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u_int times;
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/* keep track of the number of times this thread locked the mutex */
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times = recursive->times;
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/* mutex owner gets cleared during condvar wait */
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cas_ptr(&recursive->thread, self, NULL);
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pthread_cond_wait(&this->condvar, &mutex->mutex);
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cas_ptr(&recursive->thread, NULL, self);
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recursive->times = times;
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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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/* use the monotonic clock based version of this function if available */
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#if defined(HAVE_PTHREAD_COND_TIMEDWAIT_MONOTONIC) && \
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!defined(HAVE_CONDATTR_CLOCK_MONOTONIC)
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#define pthread_cond_timedwait pthread_cond_timedwait_monotonic
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#endif
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METHOD(condvar_t, timed_wait_abs, bool,
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private_condvar_t *this, private_mutex_t *mutex, 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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thread_t *self = thread_current();
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u_int times;
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times = recursive->times;
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cas_ptr(&recursive->thread, self, NULL);
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timed_out = pthread_cond_timedwait(&this->condvar, &mutex->mutex,
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&ts) == ETIMEDOUT;
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cas_ptr(&recursive->thread, NULL, self);
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recursive->times = times;
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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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METHOD(condvar_t, timed_wait, bool,
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private_condvar_t *this, private_mutex_t *mutex, 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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timeval_add_ms(&tv, ms);
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return timed_wait_abs(this, mutex, tv);
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}
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METHOD(condvar_t, signal_, void,
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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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METHOD(condvar_t, broadcast, void,
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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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METHOD(condvar_t, condvar_destroy, void,
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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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private_condvar_t *this;
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INIT(this,
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.public = {
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.wait = (void*)_wait_,
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.timed_wait = (void*)_timed_wait,
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.timed_wait_abs = (void*)_timed_wait_abs,
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.signal = _signal_,
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.broadcast = _broadcast,
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.destroy = _condvar_destroy,
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}
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);
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#ifdef HAVE_PTHREAD_CONDATTR_INIT
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{
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pthread_condattr_t condattr;
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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, TIME_CLOCK_ID);
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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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}
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#endif
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return &this->public;
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}
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}
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}
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