1 /*
   2  * Copyright (c) 2011, 2013, 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 #import <AppKit/AppKit.h>
  27 #import <JavaNativeFoundation/JavaNativeFoundation.h>
  28 #import <objc/message.h>
  29 
  30 #import "ThreadUtilities.h"
  31 
  32 
  33 // The following must be named "jvm", as there are extern references to it in AWT
  34 JavaVM *jvm = NULL;
  35 static JNIEnv *appKitEnv = NULL;
  36 static jobject appkitThreadGroup = NULL;

  37 
  38 static inline void attachCurrentThread(void** env) {
  39     if ([NSThread isMainThread]) {
  40         JavaVMAttachArgs args;
  41         args.version = JNI_VERSION_1_4;
  42         args.name = "AppKit Thread";
  43         args.group = appkitThreadGroup;
  44         (*jvm)->AttachCurrentThreadAsDaemon(jvm, env, &args);
  45     } else {
  46         (*jvm)->AttachCurrentThreadAsDaemon(jvm, env, NULL);
  47     }
  48 }
  49 
  50 @implementation ThreadUtilities
  51 
  52 + (JNIEnv*)getJNIEnv {
  53 AWT_ASSERT_APPKIT_THREAD;
  54     if (appKitEnv == NULL) {
  55         attachCurrentThread((void **)&appKitEnv);
  56     }
  57     return appKitEnv;
  58 }
  59 
  60 + (JNIEnv*)getJNIEnvUncached {
  61     JNIEnv *env = NULL;
  62     attachCurrentThread((void **)&env);
  63     return env;
  64 }
  65 
  66 + (void)detachCurrentThread {
  67     (*jvm)->DetachCurrentThread(jvm);
  68 }
  69 
  70 + (void)setAppkitThreadGroup:(jobject)group {
  71     appkitThreadGroup = group;
  72 }
  73 
  74 + (void)performOnMainThreadWaiting:(BOOL)wait block:(void (^)())block {
  75     if ([NSThread isMainThread] && wait == YES) {
  76         block(); 
  77     } else { 
  78         [JNFRunLoop performOnMainThreadWaiting:wait withBlock:block]; 
  79     }
  80 }
  81 
  82 + (void)performOnMainThread:(SEL)aSelector on:(id)target withObject:(id)arg waitUntilDone:(BOOL)wait {
  83     if ([NSThread isMainThread] && wait == YES) {
  84         [target performSelector:aSelector withObject:arg];
  85     } else {
  86         [JNFRunLoop performOnMainThread:aSelector on:target withObject:arg waitUntilDone:wait];
  87     }
  88 }
  89 








  90 @end
  91 
  92 
  93 void OSXAPP_SetJavaVM(JavaVM *vm)
  94 {
  95     jvm = vm;
  96 }
  97 
--- EOF ---