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/*
* Copyright 2011, Ben Langmead <blangmea@jhsph.edu>
*
* This file is part of Bowtie 2.
*
* Bowtie 2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Bowtie 2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Bowtie 2. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef THREADING_H_
#define THREADING_H_
#include <iostream>
#include "spinlock.h"
// Note that USE_SPINLOCK trumps BOWTIE_PTHREADS
#ifdef BOWTIE_PTHREADS
#include <pthread.h>
#endif
#ifdef USE_SPINLOCK
# include "spinlock.h"
# define MUTEX_T SpinLock
# define MUTEX_INIT(l)
# define MUTEX_LOCK(l) (l).Enter()
# define MUTEX_UNLOCK(l) (l).Leave()
#else
# ifdef BOWTIE_PTHREADS
# define MUTEX_T pthread_mutex_t
# define MUTEX_INIT(l) pthread_mutex_init(&l, NULL)
# define MUTEX_LOCK(l) pthread_mutex_lock(&l)
# define MUTEX_UNLOCK(l) pthread_mutex_unlock(&l)
# else
# define MUTEX_T int
# define MUTEX_INIT(l) l = 0
# define MUTEX_LOCK(l) l = 1
# define MUTEX_UNLOCK(l) l = 0
# endif /* BOWTIE_PTHREADS */
#endif /* USE_SPINLOCK */
#ifdef BOWTIE_PTHREADS
# define THREAD_T pthread_t
# define THREAD_CREATE(t, f, v) createThread(t, f, v)
# define THREAD_JOIN(t) joinThread(t)
# define THREAD_YIELD() 0
#else
# define THREAD_T int
# define THREAD_CREATE(t, f, v) (*f)(v)
# define THREAD_JOIN(thr)
# define THREAD_YIELD() 0
#endif /* USE_PTHREADS */
/**
* Wrap a lock; obtain lock upon construction, release upon destruction.
*/
class ThreadSafe {
public:
ThreadSafe(MUTEX_T* lock, bool really = true) {
if(really) {
lock_ = lock;
MUTEX_LOCK(*lock_);
} else lock_ = NULL;
}
~ThreadSafe() {
if(lock_ != NULL) MUTEX_UNLOCK(*lock_);
}
private:
MUTEX_T *lock_;
};
#ifdef BOWTIE_PTHREADS
static inline void joinThread(pthread_t th) {
int ret, *tmp;
if((ret = pthread_join(th, (void**)(int**)&tmp)) != 0) {
std::cerr << "Error: pthread_join returned non-zero status: "
<< ret << std::endl;
throw 1;
}
}
static inline void createThread(pthread_t* th,
void *(*start_routine) (void *),
void *arg)
{
int ret;
pthread_attr_t pt_attr;
pthread_attr_init(&pt_attr);
pthread_attr_setdetachstate(&pt_attr, PTHREAD_CREATE_JOINABLE);
pthread_attr_setstacksize(&pt_attr, 2 << 20);
if((ret = pthread_create(th, &pt_attr, start_routine, arg)) != 0) {
std::cerr << "Error: pthread_create returned non-zero status: "
<< ret << std::endl;
throw 1;
}
}
#endif
#endif
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