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qemu-thread: Add qemu_cond_timedwait

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The new function is needed to implement conditional sleep for CPU
throttling. It's possible to reuse qemu_sem_timedwait, but it's more
difficult than just add qemu_cond_timedwait.

Also moved compute_abs_deadline function up the code to reuse it in
qemu_cond_timedwait_impl win32.

Signed-off-by: Yury Kotov <yury-kotov@yandex-team.ru>
Message-Id: <20190909131335.16848-2-yury-kotov@yandex-team.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Yury Kotov 2019-09-09 16:13:33 +03:00 • committed by Paolo Bonzini
parent 7a3df11c2a
commit 3dcc9c6ec4
4 changed files with 85 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

41
util/qemu-thread-posix.c
View file

@ -36,6 +36,18 @@ static void error_exit(int err, const char *msg)
abort();
}
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;
}
}
void qemu_mutex_init(QemuMutex *mutex)
{
int err;
@ -164,6 +176,23 @@ void qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex, const char *file, con
error_exit(err, __func__);
}
bool qemu_cond_timedwait_impl(QemuCond *cond, QemuMutex *mutex, int ms,
const char *file, const int line)
{
int err;
struct timespec ts;
assert(cond->initialized);
trace_qemu_mutex_unlock(mutex, file, line);
compute_abs_deadline(&ts, ms);
err = pthread_cond_timedwait(&cond->cond, &mutex->lock, &ts);
trace_qemu_mutex_locked(mutex, file, line);
if (err && err != ETIMEDOUT) {
error_exit(err, __func__);
}
return err != ETIMEDOUT;
}
void qemu_sem_init(QemuSemaphore *sem, int init)
{
int rc;
@ -238,18 +267,6 @@ void qemu_sem_post(QemuSemaphore *sem)
#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;