pthread我可以得到原始参数吗？

Question

Heres the snippet of code:

pthread_create(&worker->thread, NULL, EagleWorker_begin, worker);

void* EagleWorker_begin(void *obj)
{
    EagleWorker *worker = (EagleWorker*) obj;
}

This works fine but is there a way to recover obj from the current thread without having to pass it all the way through every function?

Answer 1

Yes. You can use thread specific data (thread local storage) to make thread wide "globals". The thread code can access these like normal globals. But each thread has it's own global space.

Try this.

pthread_create(&worker->thread, NULL, EagleWorker_begin, worker);

__thread EagleWorker *worker;

void* EagleWorker_begin(void *obj)
{
    worker = (EagleWorker*) obj;

    foo();
}

void foo()
{
    worker->whatever = whatever;
}

You still need to make sure that you allocate a EagleWorker for each thread and pass it into pthread_create().