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/*
* Wrappers around mutex/cond/thread functions
*
* Copyright Red Hat, Inc. 2009
*
* Author:
* Marcelo Tosatti <mtosatti@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include "qemu-thread.h"
static void error_exit(int err, const char *msg)
{
fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err));
exit(1);
}
void qemu_mutex_init(QemuMutex *mutex)
{
int err;
pthread_mutexattr_t mutexattr;
pthread_mutexattr_init(&mutexattr);
pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_ERRORCHECK);
err = pthread_mutex_init(&mutex->lock, &mutexattr);
pthread_mutexattr_destroy(&mutexattr);
if (err)
error_exit(err, __func__);
}
void qemu_mutex_destroy(QemuMutex *mutex)
{
int err;
err = pthread_mutex_destroy(&mutex->lock);
if (err)
error_exit(err, __func__);
}
void qemu_mutex_lock(QemuMutex *mutex)
{
int err;
err = pthread_mutex_lock(&mutex->lock);
if (err)
error_exit(err, __func__);
}
int qemu_mutex_trylock(QemuMutex *mutex)
{
return pthread_mutex_trylock(&mutex->lock);
}
static void timespec_add_ms(struct timespec *ts, uint64_t msecs)
{
ts->tv_sec = ts->tv_sec + (long)(msecs / 1000);
ts->tv_nsec = (ts->tv_nsec + ((long)msecs % 1000) * 1000000);
if (ts->tv_nsec >= 1000000000) {
ts->tv_nsec -= 1000000000;
ts->tv_sec++;
}
}
int qemu_mutex_timedlock(QemuMutex *mutex, uint64_t msecs)
{
int err;
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
timespec_add_ms(&ts, msecs);
err = pthread_mutex_timedlock(&mutex->lock, &ts);
if (err && err != ETIMEDOUT)
error_exit(err, __func__);
return err;
}
void qemu_mutex_unlock(QemuMutex *mutex)
{
int err;
err = pthread_mutex_unlock(&mutex->lock);
if (err)
error_exit(err, __func__);
}
void qemu_cond_init(QemuCond *cond)
{
int err;
err = pthread_cond_init(&cond->cond, NULL);
if (err)
error_exit(err, __func__);
}
void qemu_cond_destroy(QemuCond *cond)
{
int err;
err = pthread_cond_destroy(&cond->cond);
if (err)
error_exit(err, __func__);
}
void qemu_cond_signal(QemuCond *cond)
{
int err;
err = pthread_cond_signal(&cond->cond);
if (err)
error_exit(err, __func__);
}
void qemu_cond_broadcast(QemuCond *cond)
{
int err;
err = pthread_cond_broadcast(&cond->cond);
if (err)
error_exit(err, __func__);
}
void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
{
int err;
err = pthread_cond_wait(&cond->cond, &mutex->lock);
if (err)
error_exit(err, __func__);
}
int qemu_cond_timedwait(QemuCond *cond, QemuMutex *mutex, uint64_t msecs)
{
struct timespec ts;
int err;
clock_gettime(CLOCK_REALTIME, &ts);
timespec_add_ms(&ts, msecs);
err = pthread_cond_timedwait(&cond->cond, &mutex->lock, &ts);
if (err && err != ETIMEDOUT)
error_exit(err, __func__);
return err;
}
void qemu_thread_create(QemuThread *thread,
void *(*start_routine)(void*),
void *arg)
{
int err;
/* Leave signal handling to the iothread. */
sigset_t set, oldset;
sigfillset(&set);
pthread_sigmask(SIG_SETMASK, &set, &oldset);
err = pthread_create(&thread->thread, NULL, start_routine, arg);
if (err)
error_exit(err, __func__);
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
}
void qemu_thread_get_self(QemuThread *thread)
{
thread->thread = pthread_self();
}
int qemu_thread_is_self(QemuThread *thread)
{
return pthread_equal(pthread_self(), thread->thread);
}
void qemu_thread_exit(void *retval)
{
pthread_exit(retval);
}
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