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(PECL pthreads >= 2.0.0)
当调用 Thread 对象的 start 方法时,该对象的 run 方法中的代码将在独立线程中并行执行。
run 方法中的代码执行完毕之后,独立线程立即退出,并且等待合适的时机由创建者线程加入(join)。
依赖于引擎本身的机制检测何时加入线程可能引发非预期的行为,程序员应该尽可能的显式控制线程加入的时机。