1 /*
   2  * Copyright (c) 1995, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #ifdef HEADLESS
  27     #error This file should not be included in headless library
  28 #endif
  29 
  30 #include "awt_p.h"
  31 #include "color.h"
  32 #include <X11/Xatom.h>
  33 #include <X11/Xmd.h>
  34 #include <X11/Xutil.h>
  35 #include <X11/Xproto.h>
  36 #include <jni.h>
  37 #include <jni_util.h>
  38 #include <sys/time.h>
  39 
  40 
  41 #include "java_awt_event_MouseWheelEvent.h"
  42 
  43 /*
  44  * Called by "ToolkitErrorHandler" function in "XlibWrapper.c" file.
  45  */
  46 XErrorHandler current_native_xerror_handler = NULL;
  47 
  48 extern jint getModifiers(uint32_t state, jint button, jint keyCode);
  49 extern jint getButton(uint32_t button);
  50 
  51 static Atom OLDecorDelAtom = 0;
  52 static Atom MWMHints = 0;
  53 static Atom DTWMHints = 0;
  54 static Atom decor_list[9];
  55 
  56 #ifndef MAX
  57 #define MAX(a,b) ((a) > (b) ? (a) : (b))
  58 #endif
  59 
  60 #ifndef MIN
  61 #define MIN(a,b) ((a) < (b) ? (a) : (b))
  62 #endif
  63 
  64 jboolean
  65 awtJNI_ThreadYield(JNIEnv *env) {
  66 
  67     static jclass threadClass = NULL;
  68     static jmethodID yieldMethodID = NULL;
  69 
  70     /* Initialize our java identifiers once. Checking before locking
  71      * is a huge performance win.
  72      */
  73     if (threadClass == NULL) {
  74         // should enter a monitor here...
  75         Boolean err = FALSE;
  76         if (threadClass == NULL) {
  77             jclass tc = (*env)->FindClass(env, "java/lang/Thread");
  78             CHECK_NULL_RETURN(tc, JNI_FALSE);
  79             threadClass = (*env)->NewGlobalRef(env, tc);
  80             (*env)->DeleteLocalRef(env, tc);
  81             if (threadClass != NULL) {
  82                 yieldMethodID = (*env)->GetStaticMethodID(env,
  83                                               threadClass,
  84                                               "yield",
  85                                               "()V"
  86                                                 );
  87             }
  88         }
  89         if (yieldMethodID == NULL) {
  90             threadClass = NULL;
  91             err = TRUE;
  92         }
  93         if (err) {
  94             return JNI_FALSE;
  95         }
  96     } /* threadClass == NULL*/
  97 
  98     (*env)->CallStaticVoidMethod(env, threadClass, yieldMethodID);
  99     DASSERT(!((*env)->ExceptionOccurred(env)));
 100     if ((*env)->ExceptionCheck(env)) {
 101         return JNI_FALSE;
 102     }
 103     return JNI_TRUE;
 104 } /* awtJNI_ThreadYield() */