防止线程终止影响C中的父进程？

Question

My goal is to create an event handling infrastructure that will allow for registration of callback functions and calls to such functions based on time. Further, I plan to make the callback handler multithreaded as there are no restrictions on the type of callbacks, so a sequential architecture could cause unwanted blocking.

From my research I found that if a thread experiences undefined behavior and is terminated (.ie with SIGSEGV) then the entire process exits - which is obviously undesirable.

The question, then, is what options are there for ensuring thread independence? I do not think fork ing is a viable option in this case since the callbacks are not fully fledged programs, but rather simple routines to do various time-based tasks.

Answer 1

Correct me if I'm wrong.. If you want time-based tasks, I highly recommend you to try semaphores to control thread.

Block thread function like :

while(1){
    sem_wait(my_semaphore);
    code_that_needs_to_be_done_in_thread;
}

when you need your work in thread to be done just signal it from code whenever you want and howmany times you want:

sem_post(my_semaphore);
...
other_code;
sem_post(my_semaphore);
...