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cleanup

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This commit is contained in:
Nguyen Anh Quynh
2017-01-09 13:28:28 +08:00
parent ffa97dc2a1
commit d7ead1135d
21 changed files with 1 additions and 714 deletions
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281
qemu/util/qemu-thread-posix.c
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@ -55,6 +55,7 @@ void qemu_mutex_destroy(QemuMutex *mutex)
error_exit(err, __func__);
}
void qemu_mutex_lock(QemuMutex *mutex)
{
int err;
@ -64,11 +65,6 @@ void qemu_mutex_lock(QemuMutex *mutex)
error_exit(err, __func__);
}
int qemu_mutex_trylock(QemuMutex *mutex)
{
return pthread_mutex_trylock(&mutex->lock);
}
void qemu_mutex_unlock(QemuMutex *mutex)
{
int err;
@ -114,281 +110,6 @@ void qemu_cond_broadcast(QemuCond *cond)
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 == UINT_MAX) {
rc = EINVAL;
} else {
sem->count++;
rc = pthread_cond_signal(&sem->cond);
}
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__)
rc = 0;
compute_abs_deadline(&ts, ms);
pthread_mutex_lock(&sem->lock);
while (sem->count == 0) {
rc = pthread_cond_timedwait(&sem->cond, &sem->lock, &ts);
if (rc == ETIMEDOUT) {
break;
}
if (rc != 0) {
error_exit(rc, __func__);
}
}
if (rc != ETIMEDOUT) {
--sem->count;
}
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)
{
int rc;
#if defined(__APPLE__) || defined(__NetBSD__)
pthread_mutex_lock(&sem->lock);
while (sem->count == 0) {
rc = pthread_cond_wait(&sem->cond, &sem->lock);
if (rc != 0) {
error_exit(rc, __func__);
}
}
--sem->count;
pthread_mutex_unlock(&sem->lock);
#else
do {
rc = sem_wait(&sem->sem);
} while (rc == -1 && errno == EINTR);
if (rc < 0) {
error_exit(errno, __func__);
}
#endif
}
#ifdef __linux__
#define futex(...) syscall(__NR_futex, __VA_ARGS__)
static inline void futex_wake(QemuEvent *ev, int n)
{
futex(ev, FUTEX_WAKE, n, NULL, NULL, 0);
}
static inline void futex_wait(QemuEvent *ev, unsigned val)
{
futex(ev, FUTEX_WAIT, (int) val, NULL, NULL, 0);
}
#else
static inline void futex_wake(QemuEvent *ev, int n)
{
pthread_mutex_lock(&ev->lock);
if (n == 1) {
pthread_cond_signal(&ev->cond);
} else {
pthread_cond_broadcast(&ev->cond);
}
pthread_mutex_unlock(&ev->lock);
}
static inline void futex_wait(QemuEvent *ev, unsigned val)
{
pthread_mutex_lock(&ev->lock);
if (ev->value == val) {
pthread_cond_wait(&ev->cond, &ev->lock);
}
pthread_mutex_unlock(&ev->lock);
}
#endif
/* Valid transitions:
* - free->set, when setting the event
* - busy->set, when setting the event, followed by futex_wake
* - set->free, when resetting the event
* - free->busy, when waiting
*
* set->busy does not happen (it can be observed from the outside but
* it really is set->free->busy).
*
* busy->free provably cannot happen; to enforce it, the set->free transition
* is done with an OR, which becomes a no-op if the event has concurrently
* transitioned to free or busy.
*/
#define EV_SET 0
#define EV_FREE 1
#define EV_BUSY -1
void qemu_event_init(QemuEvent *ev, bool init)
{
#ifndef __linux__
pthread_mutex_init(&ev->lock, NULL);
pthread_cond_init(&ev->cond, NULL);
#endif
ev->value = (init ? EV_SET : EV_FREE);
}
void qemu_event_destroy(QemuEvent *ev)
{
#ifndef __linux__
pthread_mutex_destroy(&ev->lock);
pthread_cond_destroy(&ev->cond);
#endif
}
void qemu_event_set(QemuEvent *ev)
{
if (atomic_mb_read(&ev->value) != EV_SET) {
if (atomic_xchg(&ev->value, EV_SET) == EV_BUSY) {
/* There were waiters, wake them up. */
futex_wake(ev, INT_MAX);
}
}
}
void qemu_event_reset(QemuEvent *ev)
{
if (atomic_mb_read(&ev->value) == EV_SET) {
/*
* If there was a concurrent reset (or even reset+wait),
* do nothing. Otherwise change EV_SET->EV_FREE.
*/
atomic_or(&ev->value, EV_FREE);
}
}
void qemu_event_wait(QemuEvent *ev)
{
unsigned value;
value = atomic_mb_read(&ev->value);
if (value != EV_SET) {
if (value == EV_FREE) {
/*
* Leave the event reset and tell qemu_event_set that there
* are waiters. No need to retry, because there cannot be
* a concurent busy->free transition. After the CAS, the
* event will be either set or busy.
*/
if (atomic_cmpxchg(&ev->value, EV_FREE, EV_BUSY) == EV_SET) {
return;
}
}
futex_wait(ev, EV_BUSY);
}
}
int qemu_thread_create(struct uc_struct *uc, QemuThread *thread, const char *name,
void *(*start_routine)(void*),
void *arg, int mode)