6
我真的很陌生，因此，如果這聽起來像一個愚蠢的問題，我提前道歉。OSX：JavaVM，AWT/Swing和可能的死鎖
我正在嘗試構建一個用普通C編寫的簡單應用程序，它必須創建一個JavaVM，然後通過基於AWT/Swing加載java代碼來創建一個新窗口。
正在關注this技術說明我知道只有在Mac OSX中，必須從與主線程不同的線程調用JavaVM才能創建基於AWT的GUI。
因此，在我的C應用程序的main函數中，我創建了一個新線程來執行從javaVM創建到創建GUI的所有內容。
由於應用程序並非如此簡單，我將發佈一個簡化版本。
主要功能：
int main(int argc, char** argv)
{
// Run-time loading of JavaVM framework
void *result;
result = dlopen("/System/Library/Frameworks/JavaVM.framework/JavaVM", RTLD_LAZY);
if (!result) {
printf("can't open library JavaVM: %s\n", dlerror());
}
else {
printf("library JavaVM loaded\n");
}
/* Start the thread that runs the VM. */
pthread_t vmthread;
// create a new pthread copying the stack size of the primordial pthread
struct rlimit limit;
size_t stack_size = 0;
int rc = getrlimit(RLIMIT_STACK, &limit);
if (rc == 0) {
if (limit.rlim_cur != 0LL) {
stack_size = (size_t)limit.rlim_cur;
}
}
pthread_attr_t thread_attr;
pthread_attr_init(&thread_attr);
pthread_attr_setscope(&thread_attr, PTHREAD_SCOPE_SYSTEM);
pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);
if (stack_size > 0) {
pthread_attr_setstacksize(&thread_attr, stack_size);
}
/* Start the thread that we will start the JVM on. */
pthread_create(&vmthread, &thread_attr, startJava, (void *)&thread_data_struct);
pthread_attr_destroy(&thread_attr);
pthread_exit(NULL);
return 0;
}
線程函數：
void *startJava(void *jvm_lib)
{
JavaVMInitArgs args;
const char* classpath = getenv("CLASSPATH");
// determine classpath
char* classpath_opt = str_printf("-Djava.class.path=%s", classpath);
JavaVMOption* option = malloc(sizeof(JavaVMOption) * 2);
option[0].optionString = classpath_opt;
option[1].optionString = str_printf("-verbose:jni");
args.version = JNI_VERSION_1_6;
args.nOptions = 2;
args.options = option;
args.ignoreUnrecognized = JNI_FALSE; // don't ignore unrecognized options
fptr_JNI_CreateJavaVM JNI_CreateJavaVM_fp = (fptr_JNI_CreateJavaVM)dl_dlsym(jvm_lib,
"JNI_CreateJavaVM");
int result = JNI_CreateJavaVM_fp(&jvm, (void**) &env, &args);
free(option);
free(classpath_opt);
// launch java code
jclass init_class = (*env)->FindClass(env, "org/classes/Loader");
jmethodID load_id = (*env)->GetStaticMethodID(env, init_class, "Load",
"(Ljava/lang/String;Lorg/classes/stuff;J)V");
(*env)->CallStaticVoidMethod(env, init_class, load_id);
}
Java代碼：（修訂版）
package org.classes;
import java.awt.AWTException;
import java.awt.Component;
import java.awt.Frame;
import java.awt.image.BufferedImage;
import java.awt.EventQueue;
public class Loader {
public static void Load(String baseDir, Stuff stuff, long nativePointer)
{
EventQueue.invokeLater(new Runnable() {
public void run() {
System.loadLibrary("drawingHelperLibrary");
...
...
...
// start test window
Frame frame = new Frame();
frame.setSize(640,480);
frame.setLocation(50, 50);
frame.setVisible(true);
}
});
}
}
所有的O f除了創建導致死鎖或類似情況的窗口之外，上述代碼執行成功，因爲終端保持繁忙狀態，沒有任何CPU使用情況，並且兩個線程都保持活動狀態。
如果我註釋掉有關創建窗口的行，應用程序將成功執行並退出。
這是從jstack輸出：
Full thread dump Java HotSpot(TM) 64-Bit Server VM (20.4-b02-402 mixed mode):
"Attach Listener" daemon prio=9 tid=1040b1800 nid=0x11b888000 waiting on condition [00000000]
java.lang.Thread.State: RUNNABLE
"Low Memory Detector" daemon prio=5 tid=103806000 nid=0x10b137000 runnable [00000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread1" daemon prio=9 tid=103805800 nid=0x10b034000 waiting on condition [00000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" daemon prio=9 tid=103804800 nid=0x10af31000 waiting on condition [00000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" daemon prio=9 tid=103804000 nid=0x10ae2e000 runnable [00000000]
java.lang.Thread.State: RUNNABLE
"Surrogate Locker Thread (Concurrent GC)" daemon prio=5 tid=103803000 nid=0x10ad2b000 waiting on condition [00000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" daemon prio=8 tid=10409b800 nid=0x10ac28000 in Object.wait() [10ac27000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <7f3001300> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <7f3001300> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=10409b000 nid=0x10ab25000 in Object.wait() [10ab24000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <7f30011d8> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:485)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <7f30011d8> (a java.lang.ref.Reference$Lock)
"main" prio=5 tid=104000800 nid=0x10048d000 runnable [10048a000]
java.lang.Thread.State: RUNNABLE
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1827)
- locked <7f30010a8> (a java.util.Vector)
- locked <7f3001100> (a java.util.Vector)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1724)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
- locked <7f3004e90> (a java.lang.Runtime)
at java.lang.System.loadLibrary(System.java:1045)
at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50)
at java.security.AccessController.doPrivileged(Native Method)
at sun.awt.NativeLibLoader.loadLibraries(NativeLibLoader.java:38)
at sun.awt.DebugHelper.<clinit>(DebugHelper.java:29)
at java.awt.Component.<clinit>(Component.java:566)
at org.classes.Loader.Load(Loader.java:69)
"VM Thread" prio=9 tid=104096000 nid=0x10aa22000 runnable
"Gang worker#0 (Parallel GC Threads)" prio=9 tid=104002000 nid=0x103504000 runnable
"Gang worker#1 (Parallel GC Threads)" prio=9 tid=104002800 nid=0x103607000 runnable
"Concurrent Mark-Sweep GC Thread" prio=9 tid=10404d000 nid=0x10a6f0000 runnable
"VM Periodic Task Thread" prio=10 tid=103817800 nid=0x10b23a000 waiting on condition
"Exception Catcher Thread" prio=10 tid=104001800 nid=0x103401000 runnable
JNI global references: 913
我真的不知道還有什麼可怎麼辦。也許這是一個愚蠢的錯誤，但由於這是我第一次看這個Java-C混合，所以我不夠熟練。
更新：我已經更新了java代碼（感謝trashgod），但它仍然無法正常工作。 我錯過了什麼嗎？
感謝提示，但鏈接選項對應的是什麼？ – 2013-12-27 08:16:20
好的，謝謝，我自己找到了：'-framework CoreFoundation' – 2013-12-27 09:19:20