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-rw-r--r--util/qemu-thread-posix.c327
1 files changed, 327 insertions, 0 deletions
diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c
new file mode 100644
index 0000000000..4489abf1d8
--- /dev/null
+++ b/util/qemu-thread-posix.c
@@ -0,0 +1,327 @@
+/*
+ * 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 <limits.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include "qemu/thread.h"
+
+static void error_exit(int err, const char *msg)
+{
+ fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err));
+ abort();
+}
+
+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);
+}
+
+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__);
+}
+
+void qemu_sem_init(QemuSemaphore *sem, int init)
+{
+ int rc;
+
+#if defined(__APPLE__) || defined(__NetBSD__)
+ rc = pthread_mutex_init(&sem->lock, NULL);
+ if (rc != 0) {
+ error_exit(rc, __func__);
+ }
+ rc = pthread_cond_init(&sem->cond, NULL);
+ if (rc != 0) {
+ error_exit(rc, __func__);
+ }
+ if (init < 0) {
+ error_exit(EINVAL, __func__);
+ }
+ sem->count = init;
+#else
+ rc = sem_init(&sem->sem, 0, init);
+ if (rc < 0) {
+ error_exit(errno, __func__);
+ }
+#endif
+}
+
+void qemu_sem_destroy(QemuSemaphore *sem)
+{
+ int rc;
+
+#if defined(__APPLE__) || defined(__NetBSD__)
+ rc = pthread_cond_destroy(&sem->cond);
+ if (rc < 0) {
+ error_exit(rc, __func__);
+ }
+ rc = pthread_mutex_destroy(&sem->lock);
+ if (rc < 0) {
+ error_exit(rc, __func__);
+ }
+#else
+ rc = sem_destroy(&sem->sem);
+ if (rc < 0) {
+ error_exit(errno, __func__);
+ }
+#endif
+}
+
+void qemu_sem_post(QemuSemaphore *sem)
+{
+ int rc;
+
+#if defined(__APPLE__) || defined(__NetBSD__)
+ pthread_mutex_lock(&sem->lock);
+ if (sem->count == INT_MAX) {
+ rc = EINVAL;
+ } else if (sem->count++ < 0) {
+ rc = pthread_cond_signal(&sem->cond);
+ } else {
+ rc = 0;
+ }
+ pthread_mutex_unlock(&sem->lock);
+ if (rc != 0) {
+ error_exit(rc, __func__);
+ }
+#else
+ rc = sem_post(&sem->sem);
+ if (rc < 0) {
+ error_exit(errno, __func__);
+ }
+#endif
+}
+
+static void compute_abs_deadline(struct timespec *ts, int ms)
+{
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ ts->tv_nsec = tv.tv_usec * 1000 + (ms % 1000) * 1000000;
+ ts->tv_sec = tv.tv_sec + ms / 1000;
+ if (ts->tv_nsec >= 1000000000) {
+ ts->tv_sec++;
+ ts->tv_nsec -= 1000000000;
+ }
+}
+
+int qemu_sem_timedwait(QemuSemaphore *sem, int ms)
+{
+ int rc;
+ struct timespec ts;
+
+#if defined(__APPLE__) || defined(__NetBSD__)
+ compute_abs_deadline(&ts, ms);
+ pthread_mutex_lock(&sem->lock);
+ --sem->count;
+ while (sem->count < 0) {
+ rc = pthread_cond_timedwait(&sem->cond, &sem->lock, &ts);
+ if (rc == ETIMEDOUT) {
+ ++sem->count;
+ break;
+ }
+ if (rc != 0) {
+ error_exit(rc, __func__);
+ }
+ }
+ pthread_mutex_unlock(&sem->lock);
+ return (rc == ETIMEDOUT ? -1 : 0);
+#else
+ if (ms <= 0) {
+ /* This is cheaper than sem_timedwait. */
+ do {
+ rc = sem_trywait(&sem->sem);
+ } while (rc == -1 && errno == EINTR);
+ if (rc == -1 && errno == EAGAIN) {
+ return -1;
+ }
+ } else {
+ compute_abs_deadline(&ts, ms);
+ do {
+ rc = sem_timedwait(&sem->sem, &ts);
+ } while (rc == -1 && errno == EINTR);
+ if (rc == -1 && errno == ETIMEDOUT) {
+ return -1;
+ }
+ }
+ if (rc < 0) {
+ error_exit(errno, __func__);
+ }
+ return 0;
+#endif
+}
+
+void qemu_sem_wait(QemuSemaphore *sem)
+{
+#if defined(__APPLE__) || defined(__NetBSD__)
+ pthread_mutex_lock(&sem->lock);
+ --sem->count;
+ while (sem->count < 0) {
+ pthread_cond_wait(&sem->cond, &sem->lock);
+ }
+ pthread_mutex_unlock(&sem->lock);
+#else
+ int rc;
+
+ do {
+ rc = sem_wait(&sem->sem);
+ } while (rc == -1 && errno == EINTR);
+ if (rc < 0) {
+ error_exit(errno, __func__);
+ }
+#endif
+}
+
+void qemu_thread_create(QemuThread *thread,
+ void *(*start_routine)(void*),
+ void *arg, int mode)
+{
+ sigset_t set, oldset;
+ int err;
+ pthread_attr_t attr;
+
+ 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__);
+ }
+ }
+
+ /* Leave signal handling to the iothread. */
+ sigfillset(&set);
+ pthread_sigmask(SIG_SETMASK, &set, &oldset);
+ err = pthread_create(&thread->thread, &attr, start_routine, arg);
+ if (err)
+ error_exit(err, __func__);
+
+ pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+
+ pthread_attr_destroy(&attr);
+}
+
+void qemu_thread_get_self(QemuThread *thread)
+{
+ thread->thread = pthread_self();
+}
+
+bool qemu_thread_is_self(QemuThread *thread)
+{
+ return pthread_equal(pthread_self(), thread->thread);
+}
+
+void qemu_thread_exit(void *retval)
+{
+ pthread_exit(retval);
+}
+
+void *qemu_thread_join(QemuThread *thread)
+{
+ int err;
+ void *ret;
+
+ err = pthread_join(thread->thread, &ret);
+ if (err) {
+ error_exit(err, __func__);
+ }
+ return ret;
+}
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