1 /*
   2  * Copyright (c) 1995, 2003, 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/IntrinsicP.h>
  33 #include <X11/Xatom.h>
  34 #include <X11/Xmd.h>
  35 #include <X11/Xutil.h>
  36 #include <X11/Xproto.h>
  37 #include <jni.h>
  38 #include <jni_util.h>
  39 #include <sys/time.h>
  40 
  41 
  42 #include "java_awt_event_MouseWheelEvent.h"
  43 
  44 /*
  45  * Since X reports protocol errors asynchronously, we often need to
  46  * install an error handler that acts like a callback.  While that
  47  * specialized handler is installed we save original handler here.
  48  */
  49 XErrorHandler xerror_saved_handler;
  50 
  51 /*
  52  * A place for error handler to report the error code.
  53  */
  54 unsigned char xerror_code;
  55 
  56 extern jint getModifiers(uint32_t state, jint button, jint keyCode);
  57 extern jint getButton(uint32_t button);
  58 
  59 static Atom OLDecorDelAtom = 0;
  60 static Atom MWMHints = 0;
  61 static Atom DTWMHints = 0;
  62 static Atom decor_list[9];
  63 
  64 #ifndef MAX
  65 #define MAX(a,b) ((a) > (b) ? (a) : (b))
  66 #endif
  67 
  68 #ifndef MIN
  69 #define MIN(a,b) ((a) < (b) ? (a) : (b))
  70 #endif
  71 
  72 void
  73 awtJNI_ThreadYield(JNIEnv *env) {
  74 
  75     static jclass threadClass = NULL;
  76     static jmethodID yieldMethodID = NULL;
  77 
  78     /* Initialize our java identifiers once. Checking before locking
  79      * is a huge performance win.
  80      */
  81     if (threadClass == NULL) {
  82         // should enter a monitor here...
  83         Boolean err = FALSE;
  84         if (threadClass == NULL) {
  85             jclass tc = (*env)->FindClass(env, "java/lang/Thread");
  86             threadClass = (*env)->NewGlobalRef(env, tc);
  87             (*env)->DeleteLocalRef(env, tc);
  88             if (threadClass != NULL) {
  89                 yieldMethodID = (*env)->GetStaticMethodID(env,
  90                                               threadClass,
  91                                               "yield",
  92                                               "()V"
  93                                                 );
  94             }
  95         }
  96         if (yieldMethodID == NULL) {
  97             threadClass = NULL;
  98             err = TRUE;
  99         }
 100         if (err) {
 101             return;
 102         }
 103     } /* threadClass == NULL*/
 104 
 105     (*env)->CallStaticVoidMethod(env, threadClass, yieldMethodID);
 106     DASSERT(!((*env)->ExceptionOccurred(env)));
 107 } /* awtJNI_ThreadYield() */