/**
* 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 queueId;
int eventsPending;
EventQueue* pEventQueue;
queueId = KNI_GetParameterAsInt(2);
eventsPending = readNativeEventCommon(queueId);
if (eventsPending != -1) {
/* event was read, and more may be pending */
KNI_ReturnInt(eventsPending);
}
GET_EVENT_QUEUE_BY_ID(pEventQueue, queueId);
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");
}
blockMonitorThread(queueId);
KNI_ReturnInt(0);
}
/**
* Reads a native event without blocking.
*
* @param event An empty event to be filled in if there is a queued
* event.
* @return <tt>true</tt> if an event was read, otherwise <tt>false</tt>
*/
KNIEXPORT KNI_RETURNTYPE_BOOLEAN
Java_com_sun_midp_events_NativeEventMonitor_readNativeEvent(void) {
jint queueId;
queueId = KNI_GetParameterAsInt(2);
KNI_ReturnBoolean(readNativeEventCommon(queueId) != -1);
}
/**
* Reads a native event without blocking.
*
* @param event An empty event to be filled in if there is a queued
* event.
* @return <tt>true</tt> if an event was read, otherwise <tt>false</tt>
*/
KNIEXPORT KNI_RETURNTYPE_BOOLEAN
Java_com_sun_midp_events_NativeEventMonitor_readNativeEvent(void) {
jint isolateId;
isolateId = getCurrentIsolateId();
KNI_ReturnBoolean(readNativeEventCommon(isolateId) != -1);
}
/**
* 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);
}
