目录
- 为何需要Thread.sleep()
- sleep()的霸道独执
休眠线程
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显式控制线程调度,是让所有线程获得执行机会的好办法
/** * 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); }
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调用sleep休眠,线程进入TIME_WAITING状态。自动苏醒时,进入RUNNABLE状态,而不是运行态。
- 休眠期间,不释放任何资源,若中途被中断,则抛出InterruptedException。
- 常被用来在线程中休眠,避免空跑,造成资源浪费。