ThreadGroup线程组应用
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ThreadGroup线程组应用
一、基本方法
1、获取当前线程组名
[java] view plain copy 在CODE上查看代码片派生到我的代码片Thread.currentThread().getThreadGroup().getName()
在main方法是调用输出是：main
2、将线程放入到一个线程组中去
[java] view plain copy 在CODE上查看代码片派生到我的代码片ThreadGroup threadGroup1 = new ThreadGroup("group1"); ThreadGroup threadGroup2 = new ThreadGroup("group2");
Thread thread1 =new Thread(threadGroup1, "group1's member"); Thread thread2 =new Thread(threadGroup2, "group2's member");
其中Thread中和ThreadGroup相关的构造函数：
[java] view plain copy 在CODE上查看代码片派生到我的代码片public Thread(ThreadGroup group, Runnable target) {
init(group, target, "Thread-" + nextThreadNum(), 0);
}
public Thread(ThreadGroup group, String name) {
init(group, null, name, 0);
}
public Thread(ThreadGroup group, Runnable target, String name) { init(group, target, name, 0);
}
public Thread(ThreadGroup group, Runnable target, String name,
long stackSize) {
init(group, target, name, stackSize);
}
它们最终都是调用同一个函数：
[java] view plain copy 在CODE上查看代码片派生到我的代码片private void init(ThreadGroup g, Runnable target, String name,
long stackSize) {
Thread parent = currentThread();
SecurityManager security = System.getSecurityManager();
if (g == null) {
//安全检查
if (security != null) {
g = security.getThreadGroup();
}
//设置线程组
if (g == null) {
g = parent.getThreadGroup();
}
}
//检查可达性
g.checkAccess();
//是否有权限访问
if (security != null) {
if (isCCLOverridden(getClass())) {
security.checkPermission(SUBCLASS_IMPLEMENTATION_PERMISSION);
}
}
//往线程组添加线程但未启动
g.addUnstarted();
this.group = g;
this.daemon = parent.isDaemon();//是否守护线程
this.priority = parent.getPriority();//优先级
= name.toCharArray();
if (security == null || isCCLOverridden(parent.getClass()))
this.contextClassLoader = parent.getContextClassLoader();
else
this.contextClassLoader = parent.contextClassLoader;
this.inheritedAccessControlContext = AccessController.getContext();
this.target = target;
setPriority(priority);
if (parent.inheritableThreadLocals != null)
this.inheritableThreadLocals =
ThreadLocal.createInheritedMap(parent.inheritableThreadLocals);
this.stackSize = stackSize;
tid = nextThreadID();
this.me = this;
}
3、复制线程组：
[java] view plain copy 在CODE上查看代码片派生到我的代码片
//这样可以复制group里面的thread信息
Thread[] threads = new Thread[threadGroup.activeCount()];
threadGroup.enumerate(threads);