Function asyncSleep

fdbserver/VFSAsync.cpp:730–748

** Sleep for at least nMicro microseconds. Return the (approximate) number ** of microseconds slept for. */

** of microseconds slept for.
*/
static int asyncSleep(sqlite3_vfs* pVfs, int microseconds) {
	try {
		Future<Void> simCancel = Never();
		if (g_network->isSimulated())
			simCancel = success(g_simulator.getCurrentProcess()->shutdownSignal.getFuture());
		if (simCancel.isReady()) {
			waitFor(delay(FLOW_KNOBS->MAX_BUGGIFIED_DELAY));
			return 0;
		}
		waitFor(g_network->delay(microseconds * 1e-6, TaskPriority::DefaultDelay) || simCancel);
		return microseconds;
	} catch (Error& e) {
		if (e.isInjectedFault()) {
			VFSAsyncFile::setInjectedError(SQLITE_ERROR);
		}
		TraceEvent(SevError, "VFSAsyncSleepError").errorUnsuppressed(e);
		return 0;
	}
}

/*
** Find the current time (in Universal Coordinated Time).  Write into *piNow