2009-04-24 22:03:15 +04:00
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/*
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* Wrappers around mutex/cond/thread functions
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*
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* Copyright Red Hat, Inc. 2009
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*
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* Author:
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* Marcelo Tosatti <mtosatti@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <time.h>
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#include <signal.h>
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#include <stdint.h>
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#include <string.h>
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2011-08-08 16:36:41 +04:00
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#include <limits.h>
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#include <unistd.h>
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#include <sys/time.h>
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2013-09-25 10:20:59 +04:00
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#ifdef __linux__
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#include <sys/syscall.h>
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#include <linux/futex.h>
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#endif
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2012-12-17 21:20:00 +04:00
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#include "qemu/thread.h"
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2013-09-25 10:20:59 +04:00
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#include "qemu/atomic.h"
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2014-12-02 14:05:45 +03:00
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#include "qemu/notify.h"
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2009-04-24 22:03:15 +04:00
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2014-01-30 14:20:31 +04:00
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static bool name_threads;
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void qemu_thread_naming(bool enable)
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{
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name_threads = enable;
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2014-03-12 15:48:18 +04:00
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#ifndef CONFIG_THREAD_SETNAME_BYTHREAD
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/* This is a debugging option, not fatal */
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if (enable) {
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fprintf(stderr, "qemu: thread naming not supported on this host\n");
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}
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#endif
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2014-01-30 14:20:31 +04:00
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}
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2009-04-24 22:03:15 +04:00
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static void error_exit(int err, const char *msg)
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{
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fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err));
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2011-09-21 11:28:31 +04:00
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abort();
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2009-04-24 22:03:15 +04:00
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}
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void qemu_mutex_init(QemuMutex *mutex)
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{
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int err;
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2011-03-12 19:43:54 +03:00
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pthread_mutexattr_t mutexattr;
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2009-04-24 22:03:15 +04:00
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2011-03-12 19:43:54 +03:00
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pthread_mutexattr_init(&mutexattr);
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pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_ERRORCHECK);
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err = pthread_mutex_init(&mutex->lock, &mutexattr);
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pthread_mutexattr_destroy(&mutexattr);
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2009-04-24 22:03:15 +04:00
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if (err)
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error_exit(err, __func__);
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}
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2010-07-07 22:58:01 +04:00
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void qemu_mutex_destroy(QemuMutex *mutex)
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{
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int err;
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err = pthread_mutex_destroy(&mutex->lock);
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if (err)
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error_exit(err, __func__);
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}
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2009-04-24 22:03:15 +04:00
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void qemu_mutex_lock(QemuMutex *mutex)
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{
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int err;
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err = pthread_mutex_lock(&mutex->lock);
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if (err)
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error_exit(err, __func__);
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}
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int qemu_mutex_trylock(QemuMutex *mutex)
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{
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return pthread_mutex_trylock(&mutex->lock);
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}
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void qemu_mutex_unlock(QemuMutex *mutex)
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{
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int err;
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err = pthread_mutex_unlock(&mutex->lock);
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if (err)
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error_exit(err, __func__);
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}
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void qemu_cond_init(QemuCond *cond)
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{
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int err;
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err = pthread_cond_init(&cond->cond, NULL);
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if (err)
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error_exit(err, __func__);
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}
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2010-07-07 22:58:01 +04:00
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void qemu_cond_destroy(QemuCond *cond)
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{
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int err;
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err = pthread_cond_destroy(&cond->cond);
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if (err)
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error_exit(err, __func__);
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}
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2009-04-24 22:03:15 +04:00
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void qemu_cond_signal(QemuCond *cond)
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{
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int err;
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err = pthread_cond_signal(&cond->cond);
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if (err)
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error_exit(err, __func__);
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}
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void qemu_cond_broadcast(QemuCond *cond)
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{
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int err;
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err = pthread_cond_broadcast(&cond->cond);
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if (err)
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error_exit(err, __func__);
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}
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void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex)
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{
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int err;
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err = pthread_cond_wait(&cond->cond, &mutex->lock);
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if (err)
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error_exit(err, __func__);
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}
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2011-08-08 16:36:41 +04:00
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void qemu_sem_init(QemuSemaphore *sem, int init)
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{
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int rc;
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2012-12-28 10:38:11 +04:00
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#if defined(__APPLE__) || defined(__NetBSD__)
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2012-11-02 18:43:21 +04:00
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rc = pthread_mutex_init(&sem->lock, NULL);
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if (rc != 0) {
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error_exit(rc, __func__);
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}
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rc = pthread_cond_init(&sem->cond, NULL);
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if (rc != 0) {
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error_exit(rc, __func__);
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}
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if (init < 0) {
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error_exit(EINVAL, __func__);
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}
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sem->count = init;
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#else
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2011-08-08 16:36:41 +04:00
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rc = sem_init(&sem->sem, 0, init);
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if (rc < 0) {
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error_exit(errno, __func__);
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}
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2012-11-02 18:43:21 +04:00
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#endif
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2011-08-08 16:36:41 +04:00
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}
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void qemu_sem_destroy(QemuSemaphore *sem)
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{
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int rc;
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2012-12-28 10:38:11 +04:00
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#if defined(__APPLE__) || defined(__NetBSD__)
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2012-11-02 18:43:21 +04:00
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rc = pthread_cond_destroy(&sem->cond);
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if (rc < 0) {
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error_exit(rc, __func__);
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}
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rc = pthread_mutex_destroy(&sem->lock);
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if (rc < 0) {
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error_exit(rc, __func__);
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}
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#else
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2011-08-08 16:36:41 +04:00
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rc = sem_destroy(&sem->sem);
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if (rc < 0) {
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error_exit(errno, __func__);
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}
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2012-11-02 18:43:21 +04:00
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#endif
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2011-08-08 16:36:41 +04:00
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}
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void qemu_sem_post(QemuSemaphore *sem)
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{
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int rc;
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2012-12-28 10:38:11 +04:00
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#if defined(__APPLE__) || defined(__NetBSD__)
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2012-11-02 18:43:21 +04:00
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pthread_mutex_lock(&sem->lock);
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2013-07-03 12:58:14 +04:00
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if (sem->count == UINT_MAX) {
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2012-11-02 18:43:21 +04:00
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rc = EINVAL;
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} else {
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2013-07-03 12:58:14 +04:00
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sem->count++;
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rc = pthread_cond_signal(&sem->cond);
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2012-11-02 18:43:21 +04:00
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}
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pthread_mutex_unlock(&sem->lock);
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if (rc != 0) {
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error_exit(rc, __func__);
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}
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#else
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2011-08-08 16:36:41 +04:00
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rc = sem_post(&sem->sem);
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if (rc < 0) {
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error_exit(errno, __func__);
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}
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2012-11-02 18:43:21 +04:00
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#endif
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}
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static void compute_abs_deadline(struct timespec *ts, int ms)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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ts->tv_nsec = tv.tv_usec * 1000 + (ms % 1000) * 1000000;
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ts->tv_sec = tv.tv_sec + ms / 1000;
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if (ts->tv_nsec >= 1000000000) {
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ts->tv_sec++;
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ts->tv_nsec -= 1000000000;
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}
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2011-08-08 16:36:41 +04:00
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}
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int qemu_sem_timedwait(QemuSemaphore *sem, int ms)
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{
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int rc;
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2012-11-02 18:43:21 +04:00
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struct timespec ts;
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2012-12-28 10:38:11 +04:00
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#if defined(__APPLE__) || defined(__NetBSD__)
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2013-07-03 12:58:14 +04:00
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rc = 0;
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2012-11-02 18:43:21 +04:00
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compute_abs_deadline(&ts, ms);
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pthread_mutex_lock(&sem->lock);
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2013-07-03 12:58:14 +04:00
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while (sem->count == 0) {
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2012-11-02 18:43:21 +04:00
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rc = pthread_cond_timedwait(&sem->cond, &sem->lock, &ts);
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if (rc == ETIMEDOUT) {
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break;
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}
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if (rc != 0) {
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error_exit(rc, __func__);
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}
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}
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2013-07-03 12:58:14 +04:00
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if (rc != ETIMEDOUT) {
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--sem->count;
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}
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2012-11-02 18:43:21 +04:00
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pthread_mutex_unlock(&sem->lock);
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return (rc == ETIMEDOUT ? -1 : 0);
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#else
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2011-08-08 16:36:41 +04:00
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if (ms <= 0) {
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/* This is cheaper than sem_timedwait. */
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do {
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rc = sem_trywait(&sem->sem);
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} while (rc == -1 && errno == EINTR);
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if (rc == -1 && errno == EAGAIN) {
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return -1;
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}
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} else {
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2012-11-02 18:43:21 +04:00
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compute_abs_deadline(&ts, ms);
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2011-08-08 16:36:41 +04:00
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do {
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rc = sem_timedwait(&sem->sem, &ts);
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} while (rc == -1 && errno == EINTR);
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if (rc == -1 && errno == ETIMEDOUT) {
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return -1;
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}
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}
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if (rc < 0) {
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error_exit(errno, __func__);
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}
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return 0;
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2012-11-02 18:43:21 +04:00
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#endif
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2011-08-08 16:36:41 +04:00
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}
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void qemu_sem_wait(QemuSemaphore *sem)
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{
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2013-07-03 12:58:14 +04:00
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int rc;
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2012-12-28 10:38:11 +04:00
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#if defined(__APPLE__) || defined(__NetBSD__)
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2012-11-02 18:43:21 +04:00
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pthread_mutex_lock(&sem->lock);
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2013-07-03 12:58:14 +04:00
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while (sem->count == 0) {
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rc = pthread_cond_wait(&sem->cond, &sem->lock);
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if (rc != 0) {
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error_exit(rc, __func__);
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}
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2012-11-02 18:43:21 +04:00
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}
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2013-07-03 12:58:14 +04:00
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--sem->count;
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2012-11-02 18:43:21 +04:00
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pthread_mutex_unlock(&sem->lock);
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#else
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2011-08-08 16:36:41 +04:00
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do {
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rc = sem_wait(&sem->sem);
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} while (rc == -1 && errno == EINTR);
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if (rc < 0) {
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error_exit(errno, __func__);
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}
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2012-11-02 18:43:21 +04:00
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#endif
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2011-08-08 16:36:41 +04:00
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}
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2013-09-25 10:20:59 +04:00
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#ifdef __linux__
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#define futex(...) syscall(__NR_futex, __VA_ARGS__)
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static inline void futex_wake(QemuEvent *ev, int n)
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{
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futex(ev, FUTEX_WAKE, n, NULL, NULL, 0);
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}
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static inline void futex_wait(QemuEvent *ev, unsigned val)
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{
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futex(ev, FUTEX_WAIT, (int) val, NULL, NULL, 0);
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}
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#else
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static inline void futex_wake(QemuEvent *ev, int n)
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{
|
2015-02-02 18:36:51 +03:00
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pthread_mutex_lock(&ev->lock);
|
2013-09-25 10:20:59 +04:00
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if (n == 1) {
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pthread_cond_signal(&ev->cond);
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} else {
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pthread_cond_broadcast(&ev->cond);
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}
|
2015-02-02 18:36:51 +03:00
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pthread_mutex_unlock(&ev->lock);
|
2013-09-25 10:20:59 +04:00
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}
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static inline void futex_wait(QemuEvent *ev, unsigned val)
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{
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pthread_mutex_lock(&ev->lock);
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if (ev->value == val) {
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pthread_cond_wait(&ev->cond, &ev->lock);
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}
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pthread_mutex_unlock(&ev->lock);
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}
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#endif
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/* Valid transitions:
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* - free->set, when setting the event
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* - busy->set, when setting the event, followed by futex_wake
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* - set->free, when resetting the event
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* - free->busy, when waiting
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*
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* set->busy does not happen (it can be observed from the outside but
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* it really is set->free->busy).
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*
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* busy->free provably cannot happen; to enforce it, the set->free transition
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* is done with an OR, which becomes a no-op if the event has concurrently
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* transitioned to free or busy.
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*/
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#define EV_SET 0
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#define EV_FREE 1
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#define EV_BUSY -1
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void qemu_event_init(QemuEvent *ev, bool init)
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{
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#ifndef __linux__
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pthread_mutex_init(&ev->lock, NULL);
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pthread_cond_init(&ev->cond, NULL);
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#endif
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ev->value = (init ? EV_SET : EV_FREE);
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}
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void qemu_event_destroy(QemuEvent *ev)
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{
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|
#ifndef __linux__
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pthread_mutex_destroy(&ev->lock);
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pthread_cond_destroy(&ev->cond);
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#endif
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}
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void qemu_event_set(QemuEvent *ev)
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{
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if (atomic_mb_read(&ev->value) != EV_SET) {
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if (atomic_xchg(&ev->value, EV_SET) == EV_BUSY) {
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/* There were waiters, wake them up. */
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futex_wake(ev, INT_MAX);
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}
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}
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}
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void qemu_event_reset(QemuEvent *ev)
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{
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if (atomic_mb_read(&ev->value) == EV_SET) {
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|
|
/*
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|
* If there was a concurrent reset (or even reset+wait),
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* do nothing. Otherwise change EV_SET->EV_FREE.
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*/
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atomic_or(&ev->value, EV_FREE);
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}
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}
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|
void qemu_event_wait(QemuEvent *ev)
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|
|
{
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|
|
unsigned value;
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|
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value = atomic_mb_read(&ev->value);
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|
|
if (value != EV_SET) {
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|
|
if (value == EV_FREE) {
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|
|
/*
|
|
|
|
* Leave the event reset and tell qemu_event_set that there
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|
|
* are waiters. No need to retry, because there cannot be
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|
|
* a concurent busy->free transition. After the CAS, the
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|
|
* event will be either set or busy.
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|
*/
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|
|
if (atomic_cmpxchg(&ev->value, EV_FREE, EV_BUSY) == EV_SET) {
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|
return;
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|
}
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|
|
}
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|
|
futex_wait(ev, EV_BUSY);
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|
}
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}
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|
2014-12-02 14:05:45 +03:00
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|
|
static pthread_key_t exit_key;
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|
|
union NotifierThreadData {
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|
|
void *ptr;
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|
|
NotifierList list;
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|
|
};
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|
|
QEMU_BUILD_BUG_ON(sizeof(union NotifierThreadData) != sizeof(void *));
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|
|
void qemu_thread_atexit_add(Notifier *notifier)
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|
|
|
{
|
|
|
|
union NotifierThreadData ntd;
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|
|
ntd.ptr = pthread_getspecific(exit_key);
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|
|
notifier_list_add(&ntd.list, notifier);
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|
|
pthread_setspecific(exit_key, ntd.ptr);
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|
}
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|
|
void qemu_thread_atexit_remove(Notifier *notifier)
|
|
|
|
{
|
|
|
|
union NotifierThreadData ntd;
|
|
|
|
ntd.ptr = pthread_getspecific(exit_key);
|
|
|
|
notifier_remove(notifier);
|
|
|
|
pthread_setspecific(exit_key, ntd.ptr);
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|
|
}
|
|
|
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|
|
static void qemu_thread_atexit_run(void *arg)
|
|
|
|
{
|
|
|
|
union NotifierThreadData ntd = { .ptr = arg };
|
|
|
|
notifier_list_notify(&ntd.list, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __attribute__((constructor)) qemu_thread_atexit_init(void)
|
|
|
|
{
|
|
|
|
pthread_key_create(&exit_key, qemu_thread_atexit_run);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2014-03-12 15:48:18 +04:00
|
|
|
/* Attempt to set the threads name; note that this is for debug, so
|
|
|
|
* we're not going to fail if we can't set it.
|
|
|
|
*/
|
|
|
|
static void qemu_thread_set_name(QemuThread *thread, const char *name)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_PTHREAD_SETNAME_NP
|
|
|
|
pthread_setname_np(thread->thread, name);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2014-01-30 14:20:32 +04:00
|
|
|
void qemu_thread_create(QemuThread *thread, const char *name,
|
2009-04-24 22:03:15 +04:00
|
|
|
void *(*start_routine)(void*),
|
2011-12-12 20:21:31 +04:00
|
|
|
void *arg, int mode)
|
2009-04-24 22:03:15 +04:00
|
|
|
{
|
2011-12-12 20:21:31 +04:00
|
|
|
sigset_t set, oldset;
|
2009-04-24 22:03:15 +04:00
|
|
|
int err;
|
2011-12-12 20:21:32 +04:00
|
|
|
pthread_attr_t attr;
|
2009-04-24 22:03:15 +04:00
|
|
|
|
2011-12-12 20:21:32 +04:00
|
|
|
err = pthread_attr_init(&attr);
|
|
|
|
if (err) {
|
|
|
|
error_exit(err, __func__);
|
|
|
|
}
|
|
|
|
if (mode == QEMU_THREAD_DETACHED) {
|
|
|
|
err = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
|
|
|
|
if (err) {
|
|
|
|
error_exit(err, __func__);
|
|
|
|
}
|
|
|
|
}
|
2010-06-03 17:20:32 +04:00
|
|
|
|
2011-12-12 20:21:31 +04:00
|
|
|
/* Leave signal handling to the iothread. */
|
2010-06-03 17:20:32 +04:00
|
|
|
sigfillset(&set);
|
|
|
|
pthread_sigmask(SIG_SETMASK, &set, &oldset);
|
2011-12-12 20:21:32 +04:00
|
|
|
err = pthread_create(&thread->thread, &attr, start_routine, arg);
|
2009-04-24 22:03:15 +04:00
|
|
|
if (err)
|
|
|
|
error_exit(err, __func__);
|
2010-06-03 17:20:32 +04:00
|
|
|
|
2014-01-30 14:20:32 +04:00
|
|
|
if (name_threads) {
|
2014-03-12 15:48:18 +04:00
|
|
|
qemu_thread_set_name(thread, name);
|
2014-01-30 14:20:32 +04:00
|
|
|
}
|
|
|
|
|
2010-06-03 17:20:32 +04:00
|
|
|
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
|
2011-12-12 20:21:32 +04:00
|
|
|
|
|
|
|
pthread_attr_destroy(&attr);
|
2009-04-24 22:03:15 +04:00
|
|
|
}
|
|
|
|
|
2011-03-12 19:43:51 +03:00
|
|
|
void qemu_thread_get_self(QemuThread *thread)
|
2009-04-24 22:03:15 +04:00
|
|
|
{
|
|
|
|
thread->thread = pthread_self();
|
|
|
|
}
|
|
|
|
|
2012-05-02 19:21:31 +04:00
|
|
|
bool qemu_thread_is_self(QemuThread *thread)
|
2009-04-24 22:03:15 +04:00
|
|
|
{
|
2011-03-12 19:43:51 +03:00
|
|
|
return pthread_equal(pthread_self(), thread->thread);
|
2009-04-24 22:03:15 +04:00
|
|
|
}
|
|
|
|
|
2010-07-07 22:58:01 +04:00
|
|
|
void qemu_thread_exit(void *retval)
|
|
|
|
{
|
|
|
|
pthread_exit(retval);
|
|
|
|
}
|
2011-12-12 20:21:32 +04:00
|
|
|
|
|
|
|
void *qemu_thread_join(QemuThread *thread)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
void *ret;
|
|
|
|
|
|
|
|
err = pthread_join(thread->thread, &ret);
|
|
|
|
if (err) {
|
|
|
|
error_exit(err, __func__);
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|