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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
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17
util/qemu-thread-win32.c
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@@ -145,6 +145,23 @@ void qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex, const char *file, con
qemu_mutex_post_lock(mutex, file, line);
}
bool qemu_cond_timedwait_impl(QemuCond *cond, QemuMutex *mutex, int ms,
const char *file, const int line)
{
int rc = 0;
assert(cond->initialized);
trace_qemu_mutex_unlock(mutex, file, line);
if (!SleepConditionVariableSRW(&cond->var, &mutex->lock, ms, 0)) {
rc = GetLastError();
}
trace_qemu_mutex_locked(mutex, file, line);
if (rc && rc != ERROR_TIMEOUT) {
error_exit(rc, __func__);
}
return rc != ERROR_TIMEOUT;
}
void qemu_sem_init(QemuSemaphore *sem, int init)
{
/* Manual reset. */