qemu-thread: Add qemu_cond_timedwait

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>

1 files changed, 17 insertions, 0 deletions

diff --git a/util/qemu-thread-win32.c b/util/qemu-thread-win32.c
index 572f88535d..56a83333da 100644
--- a/util/qemu-thread-win32.c
+++ b/util/qemu-thread-win32.c
@@ -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.  */