注册一个新的线程处理程序，例如pthread_atfork或atexit

Question

I have a monitor/(watchdog kind of thread) thread which is used for query perf statistics of all threads. The thread query list of thread from /proc/self/tasks Once the list is created, I don't want to read /proc/self/tasks again unless new thread created or old thread exited. Other thread are not aware of this threads so they can't create pthread_key to get callback on exit or they can't add new entry in thread-queue on spawning.

I am looking for api like pthread_atfork or atexit for threads.

Answer 1

I am looking for api like atfork/pthread_atfork [...] for threads.

There is none.

You need to setup book-keeping for this yourself.

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Write a wrapper thread function which is passed to each call of pthread_create() and have it set up the cleanup-pusher/-popper-stuff. As an argument to pthread_create() you pass a pointer to your "real" thread function which then gets called after the wrapper "called" pthread_cleanup_push() .