happylzs2008的专栏

pthread_exit()函数
https://blog.csdn.net/zhou1021jian/article/details/71531699
void pthread_exit( void * value_ptr );
线程的终止可以是调用了pthread_exit或者该线程的例程结束。也就是说，一个线程可以隐式的退出，也可以显式的调用pthread_exit函数来退出。
pthread_exit函数唯一的参数value_ptr是函数的返回代码，只要pthread_join中的第二个参数value_ptr不是NULL，这个值将被传递给value_ptr。
函数原型如下：
int pthread_join( pthread_t  thread, void * * value_ptr );
函数pthread_join的作用是，等待一个线程终止。
调用pthread_join的线程将被挂起直到参数thread所代表的线程终止时为止。pthread_join是一个线程阻塞函数，调用它的函数将一直等到被等待的线程结束为止。
如果value_ptr不为NULL，那么线程thread的返回值存储在该指针指向的位置。该返回值可以是由pthread_exit给出的值，或者该线程被取消而返回PTHREAD_CANCELED。

https://www.jianshu.com/p/27d7ea8160a5

pthread_exit()用于线程退出，可以指定返回值，以便其他线程通过pthread_join（）函数获取该线程的返回值

return是函数返回，不一定是线程函数哦！ 只有线程函数returnpthread exit，线程才会退出

exit（）是进程退出，如果程函数中调用exit，那改线程的进程也就挂了,会导致该线程所在进程的其他线程也挂掉pthread exit，比较严重

The pthread_exit() function shall terminate the calling thread and make the value value_ptr available to any successful join with the terminating thread. Any cancellation cleanup handlers that have been pushed and not yet popped shall be popped in the reverse order that they were pushed and then executed. After all cancellation cleanup handlers have been executed, if the thread has any thread-specific data, appropriate destructor functions shall be called in an unspecified order. Thread termination does not release any application visible process resources, including, but not limited to, mutexes and file descriptors, nor does it perform any process-level cleanup actions, including, but not limited to, calling any atexit() routines that may exist.

The exit() function shall first call all functions registered by atexit(), in the reverse order of their registration, except that a function is called after any previously registered functions that had already been called at the time it was registered. Each function is called as many times as it was registered. If, during the call to any such function, a call to the longjmp() function is made that would terminate the call to the registered function, the behavior is undefined.

If a function registered by a call to atexit() fails to return, the remaining registered functions shall not be called and the rest of the exit() processing shall not be completed. If exit() is called more than once, the behavior is undefined.

note: the above method takes a snapshot of the keyboard at any one time. there is another way of retrieving data and that is to use buffered mode. in buffered mode the key data is held in a buffer ready for when you want to retrieve it. to use this method you would need to use the getdevicedata function.。named pipe server can be created using createnamedpipe function. this function creates the pipe and returns a handle for the pipe created. then connectnamedpipe should be used to listen for any incoming connections from the client. typically this waits in a infinite loops to keep receiving messages.。i had created one user control and one class file, the user control contain save button. when user click save button then i want to pass parent form name of user control as parameter. and access the function from class file please help me.。

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