2095 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2096 }
2097
2098 } // class SunToolkit
2099
2100
2101 /*
2102 * PostEventQueue is a Thread that runs in the same AppContext as the
2103 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2104 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2105 * events to this queue, which then calls EventQueue.postEvent().
2106 *
2107 * We do this because EventQueue.postEvent() may be overridden by client
2108 * code, and we mustn't ever call client code from the toolkit thread.
2109 */
2110 class PostEventQueue {
2111 private EventQueueItem queueHead = null;
2112 private EventQueueItem queueTail = null;
2113 private final EventQueue eventQueue;
2114
2115 PostEventQueue(EventQueue eq) {
2116 eventQueue = eq;
2117 }
2118
2119 public synchronized boolean noEvents() {
2120 return queueHead == null;
2121 }
2122
2123 /*
2124 * Continually post pending AWTEvents to the Java EventQueue. The method
2125 * is synchronized to ensure the flush is completed before a new event
2126 * can be posted to this queue.
2127 */
2128 public synchronized void flush() {
2129 EventQueueItem tempQueue = queueHead;
2130 queueHead = queueTail = null;
2131 while (tempQueue != null) {
2132 eventQueue.postEvent(tempQueue.event);
2133 tempQueue = tempQueue.next;
2134 }
2135 }
2136
2137 /*
2138 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2139 */
2140 void postEvent(AWTEvent event) {
2141 EventQueueItem item = new EventQueueItem(event);
2142
2143 synchronized (this) {
2144 if (queueHead == null) {
2145 queueHead = queueTail = item;
2146 } else {
2147 queueTail.next = item;
2148 queueTail = item;
2149 }
2150 }
2151 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2152 }
2153 } // class PostEventQueue
|
2095 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2096 }
2097
2098 } // class SunToolkit
2099
2100
2101 /*
2102 * PostEventQueue is a Thread that runs in the same AppContext as the
2103 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2104 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2105 * events to this queue, which then calls EventQueue.postEvent().
2106 *
2107 * We do this because EventQueue.postEvent() may be overridden by client
2108 * code, and we mustn't ever call client code from the toolkit thread.
2109 */
2110 class PostEventQueue {
2111 private EventQueueItem queueHead = null;
2112 private EventQueueItem queueTail = null;
2113 private final EventQueue eventQueue;
2114
2115 // For the case when queue is cleared but events are not posted
2116 private volatile boolean isFlushing = false;
2117
2118 PostEventQueue(EventQueue eq) {
2119 eventQueue = eq;
2120 }
2121
2122 public synchronized boolean noEvents() {
2123 return queueHead == null && !isFlushing;
2124 }
2125
2126 /*
2127 * Continually post pending AWTEvents to the Java EventQueue. The method
2128 * is synchronized to ensure the flush is completed before a new event
2129 * can be posted to this queue.
2130 *
2131 * 7177040: The method couldn't be wholly synchronized because of calls
2132 * of EventQueue.postEvent() that uses pushPopLock, otherwise it could
2133 * potentially lead to deadlock
2134 */
2135 public void flush() {
2136 EventQueueItem tempQueue;
2137 synchronized (this) {
2138 tempQueue = queueHead;
2139 queueHead = queueTail = null;
2140 isFlushing = true;
2141 }
2142 try {
2143 while (tempQueue != null) {
2144 eventQueue.postEvent(tempQueue.event);
2145 tempQueue = tempQueue.next;
2146 }
2147 }
2148 finally {
2149 isFlushing = false;
2150 }
2151 }
2152
2153 /*
2154 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2155 */
2156 void postEvent(AWTEvent event) {
2157 EventQueueItem item = new EventQueueItem(event);
2158
2159 synchronized (this) {
2160 if (queueHead == null) {
2161 queueHead = queueTail = item;
2162 } else {
2163 queueTail.next = item;
2164 queueTail = item;
2165 }
2166 }
2167 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2168 }
2169 } // class PostEventQueue
|