Archipelago » qemu

/*

 * 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);

}