/**
* Blocks Java thread that monitors specified event queue.
*
* @param queueId queue ID
*/
static void blockMonitorThread(jint queueId) {
EventQueue* pEventQueue;
jint isolateId;
GET_EVENT_QUEUE_BY_ID(pEventQueue, queueId);
if (IS_ISOLATE_QUEUE(queueId)) {
/*
* To speed up unblocking the event monitor thread, this thread
* is saved as the "special" thread of an Isolate to avoid having
* to search the entire list of threads.
*/
isolateId = QUEUE_ID_TO_ISOLATE_ID(queueId);
SNI_SetSpecialThread(isolateId);
SNI_BlockThread();
} else {
/* Block thread in the normal way */
midp_thread_wait(EVENT_QUEUE_SIGNAL, queueId, 0);
}
pEventQueue->isMonitorBlocked = KNI_TRUE;
}
/**
* Blocks the Java event thread until an event has been queued and returns
* that event and the number of events still in the queue.
*
* @param event An empty event to be filled in if there is a queued
* event.
*
* @return number of events waiting in the native queue
*/
KNIEXPORT KNI_RETURNTYPE_INT
Java_com_sun_midp_events_NativeEventMonitor_waitForNativeEvent(void) {
jint isolateId;
int eventsPending;
EventQueue* pEventQueue;
isolateId = getCurrentIsolateId();
eventsPending = readNativeEventCommon(isolateId);
if (eventsPending != -1) {
/* event was read, and more may be pending */
KNI_ReturnInt(eventsPending);
}
pEventQueue = getIsolateEventQueue(isolateId);
if (pEventQueue->isMonitorBlocked) {
/*
* ASSERT: we are about to block, so the state must not indicate
* that a monitor thread is already blocked.
*/
REPORT_CRIT(LC_CORE,
"Assertion failed: NativeEventMonitor.waitForNativeEvent "
"called when Java thread already blocked");
}
/*
* Block the event processing thread. To speed up unblocking the
* event monitor thread, this thread is saved as the "special" thread
* of an Isolate to avoid having to search the entire list of threads.
*/
SNI_SetSpecialThread(isolateId);
SNI_BlockThread();
pEventQueue->isMonitorBlocked = KNI_TRUE;
KNI_ReturnInt(0);
}