/* * 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; err = pthread_mutex_init(&mutex->lock, NULL); 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_signal(QemuThread *thread, int sig) { int err; err = pthread_kill(thread->thread, sig); if (err) error_exit(err, __func__); } void qemu_thread_self(QemuThread *thread) { thread->thread = pthread_self(); } int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2) { return pthread_equal(thread1->thread, thread2->thread); } void qemu_thread_exit(void *retval) { pthread_exit(retval); }