多线程源码分析
一、继承Thread
public class ThreadDemo extends Thread { @Override public void run() { super.run(); } }
Runable接口
@FunctionalInterface public interface Runnable { /** * When an object implementing interface <code>Runnable</code> is used * to create a thread, starting the thread causes the object's * <code>run</code> method to be called in that separately executing * thread. * <p> * The general contract of the method <code>run</code> is that it may * take any action whatsoever. * * @see java.lang.Thread#run() */ public abstract void run(); }
1.进入Thread
Thread实现Runable接口
private static native void registerNatives(); static { registerNatives(); } private volatile String name; private int priority; private Thread threadQ; private long eetop;
2.优先级
/** * The minimum priority that a thread can have. */ public final static int MIN_PRIORITY = 1; /** * The default priority that is assigned to a thread. */ public final static int NORM_PRIORITY = 5; /** * The maximum priority that a thread can have. */ public final static int MAX_PRIORITY = 10;
/** * Changes the priority of this thread. * <p> * First the <code>checkAccess</code> method of this thread is called * with no arguments. This may result in throwing a * <code>SecurityException</code>. * <p> * Otherwise, the priority of this thread is set to the smaller of * the specified <code>newPriority</code> and the maximum permitted * priority of the thread's thread group. * * @param newPriority priority to set this thread to * @exception IllegalArgumentException If the priority is not in the * range <code>MIN_PRIORITY</code> to * <code>MAX_PRIORITY</code>. * @exception SecurityException if the current thread cannot modify * this thread. * @see #getPriority * @see #checkAccess() * @see #getThreadGroup() * @see #MAX_PRIORITY * @see #MIN_PRIORITY * @see ThreadGroup#getMaxPriority() */ public final void setPriority(int newPriority) { ThreadGroup g; checkAccess(); if (newPriority > MAX_PRIORITY || newPriority < MIN_PRIORITY) { throw new IllegalArgumentException(); } if((g = getThreadGroup()) != null) { if (newPriority > g.getMaxPriority()) { newPriority = g.getMaxPriority(); } setPriority0(priority = newPriority); } } /** * Returns this thread's priority. * * @return this thread's priority. * @see #setPriority */ public final int getPriority() { return priority; }
值越小,优先级越高。
示例:
//设置正确的优先级 tp1.setPriority(5); tp2.setPriority(10); tp3.setPriority(1);
3.Sleep的两种方法
/** * Causes the currently executing thread to sleep (temporarily cease * execution) for the specified number of milliseconds, subject to * the precision and accuracy of system timers and schedulers. The thread * does not lose ownership of any monitors. * * @param millis * the length of time to sleep in milliseconds * * @throws IllegalArgumentException * if the value of {@code millis} is negative * * @throws InterruptedException * if any thread has interrupted the current thread. The * <i>interrupted status</i> of the current thread is * cleared when this exception is thrown. */ public static native void sleep(long millis) throws InterruptedException; /** * Causes the currently executing thread to sleep (temporarily cease * execution) for the specified number of milliseconds plus the specified * number of nanoseconds, subject to the precision and accuracy of system * timers and schedulers. The thread does not lose ownership of any * monitors. * * @param millis * the length of time to sleep in milliseconds * * @param nanos * {@code 0-999999} additional nanoseconds to sleep * * @throws IllegalArgumentException * if the value of {@code millis} is negative, or the value of * {@code nanos} is not in the range {@code 0-999999} * * @throws InterruptedException * if any thread has interrupted the current thread. The * <i>interrupted status</i> of the current thread is * cleared when this exception is thrown. */ public static void sleep(long millis, int nanos) throws InterruptedException { if (millis < 0) { throw new IllegalArgumentException("timeout value is negative"); } if (nanos < 0 || nanos > 999999) { throw new IllegalArgumentException( "nanosecond timeout value out of range"); } if (nanos >= 500000 || (nanos != 0 && millis == 0)) { millis++; } sleep(millis); }
4.Start:启动线程
/**
* Causes this thread to begin execution; the Java Virtual Machine
* calls the <code>run</code> method of this thread.
* <p>
* The result is that two threads are running concurrently: the
* current thread (which returns from the call to the
* <code>start</code> method) and the other thread (which executes its
* <code>run</code> method).
* <p>
* It is never legal to start a thread more than once.
* In particular, a thread may not be restarted once it has completed
* execution.
*
* @exception IllegalThreadStateException if the thread was already
* started.
* @see #run()
* @see #stop()
*/
public synchronized void start() {
/**
* This method is not invoked for the main method thread or "system"
* group threads created/set up by the VM. Any new functionality added
* to this method in the future may have to also be added to the VM.
*
* A zero status value corresponds to state "NEW".
*/
if (threadStatus != 0)
throw new IllegalThreadStateException();
/* Notify the group that this thread is about to be started
* so that it can be added to the group's list of threads
* and the group's unstarted count can be decremented. */
group.add(this);
boolean started = false;
try {
start0();
started = true;
} finally {
try {
if (!started) {
group.threadStartFailed(this);
}
} catch (Throwable ignore) {
/* do nothing. If start0 threw a Throwable then
it will be passed up the call stack */
}
}
}
线程加锁了
5.run
/** * If this thread was constructed using a separate * <code>Runnable</code> run object, then that * <code>Runnable</code> object's <code>run</code> method is called; * otherwise, this method does nothing and returns. * <p> * Subclasses of <code>Thread</code> should override this method. * * @see #start() * @see #stop() * @see #Thread(ThreadGroup, Runnable, String) */ @Override public void run() { if (target != null) { target.run(); } }
6.SetName 和getName
/** * Changes the name of this thread to be equal to the argument * <code>name</code>. * <p> * First the <code>checkAccess</code> method of this thread is called * with no arguments. This may result in throwing a * <code>SecurityException</code>. * * @param name the new name for this thread. * @exception SecurityException if the current thread cannot modify this * thread. * @see #getName * @see #checkAccess() */ public final synchronized void setName(String name) { checkAccess(); if (name == null) { throw new NullPointerException("name cannot be null"); } this.name = name; if (threadStatus != 0) { setNativeName(name); } } /** * Returns this thread's name. * * @return this thread's name. * @see #setName(String) */ public final String getName() { return name; }
7.守护线程
/** * Marks this thread as either a {@linkplain #isDaemon daemon} thread * or a user thread. The Java Virtual Machine exits when the only * threads running are all daemon threads. * * <p> This method must be invoked before the thread is started. * * @param on * if {@code true}, marks this thread as a daemon thread * * @throws IllegalThreadStateException * if this thread is {@linkplain #isAlive alive} * * @throws SecurityException * if {@link #checkAccess} determines that the current * thread cannot modify this thread */ public final void setDaemon(boolean on) { checkAccess(); if (isAlive()) { throw new IllegalThreadStateException(); } daemon = on; } /** * Tests if this thread is a daemon thread. * * @return <code>true</code> if this thread is a daemon thread; * <code>false</code> otherwise. * @see #setDaemon(boolean) */ public final boolean isDaemon() { return daemon; }
二、实现Runable接口
public class ThreadDemo1 implements Runnable { public void run() { } }
Runnable接口
@FunctionalInterface public interface Runnable { /** * When an object implementing interface <code>Runnable</code> is used * to create a thread, starting the thread causes the object's * <code>run</code> method to be called in that separately executing * thread. * <p> * The general contract of the method <code>run</code> is that it may * take any action whatsoever. * * @see java.lang.Thread#run() */ public abstract void run(); }
三、Thread与Runable比较
1.效果上没区别,写法上的区别而已。
2、没有可比性,Thread实现了Runnable接口并进行了扩展,我们通常拿来进行比较只是写法上的比较,而Thread和Runnable的实质是实现的关系,不是同类东西。
2、没有可比性,Thread实现了Runnable接口并进行了扩展,我们通常拿来进行比较只是写法上的比较,而Thread和Runnable的实质是实现的关系,不是同类东西。
无论你使用Runnable还是Thread,都有一个new Thread的过程,效果上最后都是new Thread,然后执行run方法。写法上的区别无非就是你是new Thead还是new你自定义的thread,如果你有复杂的线程操作需求,那就自定义Thread,如果只是简单的在子线程run一下任务,那就自己实现runnable,当然如果自己实现runnable的话可以多一个继承(自定义Thread必须继承Thread类,java单继承规定导致不能在继承别的了)。
四、Callable接口
public class ThreadDemo2 implements Callable { public Object call() throws Exception { return null; } }
/**
* A task that returns a result and may throw an exception.
* Implementors define a single method with no arguments called
* {@code call}.
*
* <p>The {@code Callable} interface is similar to {@link
* java.lang.Runnable}, in that both are designed for classes whose
* instances are potentially executed by another thread. A
* {@code Runnable}, however, does not return a result and cannot
* throw a checked exception.
*
* <p>The {@link Executors} class contains utility methods to
* convert from other common forms to {@code Callable} classes.
*
* @see Executor
* @since 1.5
* @author Doug Lea
* @param <V> the result type of method {@code call}
*/
@FunctionalInterface
public interface Callable<V> {
/**
* Computes a result, or throws an exception if unable to do so.
*
* @return computed result
* @throws Exception if unable to compute a result
*/
V call() throws Exception;
}
Runable接口与Callable接口都有注解@FunctionalInterface