V2EX v2qwsdcv 的所有回复第 1 页 / 共 2 页

按引用
function f(){var a ={abc:1}; var o=function(){return a};a.abc=3;return o;}
f()() //{abc: 3}
function f(){var a =1; var o=function(){a=2;return a};return o;}
f()()//2
相当于 C++的 [&](){...}

2019-08-30 13:50:45 +08:00

回复了 wsy190 创建的主题程序员写程序这么精简真的好吗？

笑死我了，您怕是别用 java8 的 steam 了。

2019-05-13 12:54:42 +08:00

回复了 tomczhen 创建的主题程序员也来记录一下第一次接私活的体验

有没有一起去台服拯救的，昨天刚建的台服号。对国服环境死心了

2019-04-11 20:01:10 +08:00

回复了 mart1nN 创建的主题 Java Java 多线程资源共享的问题

另 #13 说的对

2019-04-11 19:45:03 +08:00

回复了 mart1nN 创建的主题 Java Java 多线程资源共享的问题

源码给您找好啦，求别鄙视我们做 C++的了都不容易。

https://github.com/unofficial-openjdk/openjdk/blob/5ec14c8bb2533c20eca3564258c4dc66bf3bb9c3/src/java.base/share/classes/java/lang/Thread.java
public synchronized void start() {
...
try {
start0();
started = true;
} ...
}

private native void start0();

https://github.com/unofficial-openjdk/openjdk/blob/531ef5d0ede6d733b00c9bc1b6b3c14a0b2b3e81/src/java.base/share/native/libjava/Thread.c
{"start0", "()V", (void *)&JVM_StartThread},

https://github.com/unofficial-openjdk/openjdk/blob/e19d12112815026f04a9df075e56eb26622b9d8d/src/hotspot/share/prims/jvm.cpp

JVM_ENTRY(void, JVM_StartThread(JNIEnv* env, jobject jthread))
JVMWrapper("JVM_StartThread");
JavaThread *native_thread = NULL;
...
native_thread = new JavaThread(&thread_entry, sz);

if (native_thread->osthread() != NULL) {
// Note: the current thread is not being used within "prepare".
native_thread->prepare(jthread);
}
}
}
...
Thread::start(native_thread);

JVM_END

static void thread_entry(JavaThread* thread, TRAPS) {
HandleMark hm(THREAD);
Handle obj(THREAD, thread->threadObj());
JavaValue result(T_VOID);
JavaCalls::call_virtual(&result,
obj,
SystemDictionary::Thread_klass(),
vmSymbols::run_method_name(),
vmSymbols::void_method_signature(),
THREAD);
}

https://github.com/unofficial-openjdk/openjdk/blob/294d2d319b870ac68ca10a5b03006a70e26bcaba/src/hotspot/share/runtime/thread.cpp
void JavaThread::run() {
...
thread_main_inner();
}

void JavaThread::thread_main_inner() {
...
if (!this->has_pending_exception() &&
!java_lang_Thread::is_stillborn(this->threadObj())) {
{
ResourceMark rm(this);
this->set_native_thread_name(this->get_thread_name());
}
HandleMark hm(this);
this->entry_point()(this, this);
}
...
}

https://github.com/unofficial-openjdk/openjdk/blob/d148cecb01572f077179c94cb59117af89eb59b8/src/hotspot/share/runtime/javaCalls.cpp

https://github.com/unofficial-openjdk/openjdk/blob/e836a10c8c6ed2ef2f3219c46ca1906a2d9d6493/src/hotspot/share/classfile/vmSymbols.hpp
template(run_method_name, "run")

2019-04-04 16:41:19 +08:00

回复了 ZenFX 创建的主题汽车卡罗拉和雷凌怎么选

建议买 10 万以下的国产车。如非必然，可以考虑不买车。

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