I need to implement a thread pool using pthreads. I could not move forward. I found similar question here But that still does not clarify my question. My question is once a thread runs to its termination can I use it again? Another way of putting this question is, How does a thread return to its thread pool after running a task to its completion. Could anyone point me to some simple pthread pool article? My confusion arises mainly because I have little bit of java background. I read somewhere we cannot call start() on thread second time once it terminates.
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See also stackoverflow.com/questions/3561095/… and software.intel.com/en-us/forums/showthread.php?t=53220derobert– derobert2011-09-30 15:22:29 +00:00Commented Sep 30, 2011 at 15:22
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1 Answer
My question is once a thread runs to its termination can I use it again?
Yes, that's the purpose of the pool, to reuse threads instead of destroying them.
How does a thread return to its thread pool.
By trying to get another element from the queue. Doing it in a loop is one way.
Here is what every thread does in my implementation (this is the actual function used with pthread_create):
static void *
_tp_worker(void *arg)
{
/* ... */
/* Wait until tasks is available. */
while (!queue_get(pool->pend_q, &t_ptr)) {
/* And then execute it. */
}
}
2 Comments
cnicutar
@Lamia You can let it terminate by manipulating what is returned from
queue_get / checking something inside the while.
Jon Gjengset
You can see a relatively straightforward implementation of thread pooling with pthreads here.