void thread_pool::resize(size_t nthreads) {
// if the current pool size does not equal the requested number of
// threads shut the pool down and startup with correct number of
// threads. \todo: If the pool size is too small just add
// additional threads rather than destroying the pool
if(nthreads != pool_size) {
pool_size = nthreads;
// stop the queue from blocking
spawn_queue.stop_blocking();
// join the threads in the thread group
while(true) {
try {
threads.join(); break;
} catch (const char* error_str) {
// this should not be possible!
logstream(LOG_FATAL)
<< "Unexpected exception caught in thread pool destructor: "
<< error_str << std::endl;
}
}
spawn_queue.start_blocking();
spawn_thread_group();
}
} // end of set_nthreads
thread_pool::thread_pool(size_t nthreads, bool affinity) {
waiting_on_join = false;
tasks_inserted = 0;
tasks_completed = 0;
cpu_affinity = affinity;
pool_size = nthreads;
spawn_thread_group();
} // end of thread_pool
void thread_pool::set_cpu_affinity(bool affinity) {
if (affinity != cpu_affinity) {
cpu_affinity = affinity;
// stop the queue from blocking
spawn_queue.stop_blocking();
// join the threads in the thread group
while(1) {
try {
threads.join(); break;
} catch (const char* c) {
// this should not be possible!
logstream(LOG_FATAL)
<< "Unexpected exception caught in thread pool destructor: "
<< c << std::endl;
// ASSERT_TRUE(false); // unnecessary
}
}
spawn_queue.start_blocking();
spawn_thread_group();
}
} // end of set_cpu_affinity
thread_pool::thread_pool(size_t nthreads, bool affinity) {
cpu_affinity = affinity;
pool_size = nthreads;
spawn_thread_group();
} // end of thread_pool