My program use co-threads, because creating and reinitialize thread is
expensive, it first create threads and reuse them. The main thread
will send each co-thread a event (through condition variable)
simultaneously to do task in parallel way. Each co-thread has variety
work-time, let say it can be (in miliseconds) 200ms, 130ms, 317ms,
90ms etc to get result to be consumed by main thread.
Here I did to wake-up all threads in the main thread:
.....
for (i = 0; i < nthread; i++)
pthread_cond_broadcast(&cond);
wait_all_worker(); /* wait for all worker threads to finish */
get_all_worker_result(); /* get result from all worker thread */
...
And worker-thread routines:
...
for (;;) {
pthread_mutex_lock();
pthread_cond_wait();
pthread_mutex_unlock();
do_work();
fill_result();
}
....
My dilema is:
1. What the proper way to the main thread to wait for all co-threads
until finished?
2. After calling pthread_cond_signal() or pthread_cond_broadcast()
followed by sleep()/nanosleep(),
the condition variable looks like not signaled, (the co-thread
routine doesn't run). What make this?
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