谁知道,java中Thread.sleep背后的逻辑是什么? 。他们在使用计时器吗
最佳答案
好了,您也可以在这里http://openjdk.java.net看一看。对于版本。 7 jvm.cpp中有一些有趣的代码:
JVM_ENTRY(void, JVM_Sleep(JNIEnv* env, jclass threadClass, jlong millis))
JVMWrapper("JVM_Sleep");
if (millis osthread()->get_state();
thread->osthread()->set_state(SLEEPING);
os::sleep(thread, MinSleepInterval, false);
thread->osthread()->set_state(old_state);
}
} else {
ThreadState old_state = thread->osthread()->get_state();
thread->osthread()->set_state(SLEEPING);
if (os::sleep(thread, millis, true) == OS_INTRPT) {
// An asynchronous exception (e.g., ThreadDeathException) could have been thrown on
// us while we were sleeping. We do not overwrite those.
if (!HAS_PENDING_EXCEPTION) {
// TODO-FIXME: THROW_MSG returns which means we will not call set_state()
// to properly restore the thread state. That's likely wrong.
THROW_MSG(vmSymbols::java_lang_InterruptedException(), "sleep interrupted");
}
}
thread->osthread()->set_state(old_state);
}
JVM_END