/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
-#include "threadpool_private.h"
+#include "parmap_private.h"
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_threadpool, xbt,
- "threadpool: pool of worker threads");
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_parmap, xbt,
+ "parmap: parallel map");
-static void *_xbt_tpool_worker_main(void *tpool);
+static void *_xbt_parmap_worker_main(void *parmap);
-unsigned long tpoolcounter = 0; /* Debug purposes */
-
-xbt_tpool_t xbt_tpool_new(unsigned int num_workers, unsigned int max_jobs)
+xbt_parmap_t xbt_parmap_new(unsigned int num_workers)
{
unsigned int i;
xbt_os_thread_t worker = NULL;
- DEBUG2("Create new thread pool (%u, %u)", num_workers, max_jobs);
+ DEBUG1("Create new parmap (%u workers)", num_workers);
/* Initialize thread pool data structure */
- xbt_tpool_t tpool = xbt_new0(s_xbt_tpool_t, 1);
- tpool->mutex = xbt_os_mutex_init();
- tpool->job_posted = xbt_os_cond_init();
- tpool->job_taken = xbt_os_cond_init();
- tpool->idle_worker = xbt_os_cond_init();
- tpool->jobs_queue = xbt_dynar_new(sizeof(s_xbt_tpool_job_t), NULL);
- tpool->num_workers = num_workers;
- tpool->num_idle_workers = 0;
- tpool->max_jobs = max_jobs;
-
+ xbt_parmap_t parmap = xbt_new0(s_xbt_parmap_t, 1);
+ parmap->mutex = xbt_os_mutex_init();
+ parmap->job_posted = xbt_os_cond_init();
+ parmap->all_done = xbt_os_cond_init();
+ parmap->flags = xbt_new0(e_xbt_parmap_flag_t, num_workers + 1);
+ parmap->num_workers = num_workers;
+ parmap->num_idle_workers = 0;
+ parmap->workers_max_id = 0;
+
+ /* Init our flag to wait (for workers' initialization) */
+ parmap->flags[num_workers] = PARMAP_WAIT;
+
/* Create the pool of worker threads */
for(i=0; i < num_workers; i++){
- worker = xbt_os_thread_create(NULL, _xbt_tpool_worker_main, tpool, NULL);
+ worker = xbt_os_thread_create(NULL, _xbt_parmap_worker_main, parmap, NULL);
xbt_os_thread_detach(worker);
}
- return tpool;
+ /* wait for the workers to initialize */
+ xbt_os_mutex_acquire(parmap->mutex);
+ while(parmap->flags[num_workers] == PARMAP_WAIT)
+ xbt_os_cond_wait(parmap->all_done, parmap->mutex);
+ xbt_os_mutex_release(parmap->mutex);
+
+ return parmap;
}
-void xbt_tpool_destroy(xbt_tpool_t tpool)
+void xbt_parmap_destroy(xbt_parmap_t parmap)
{
- DEBUG1("Destroy thread pool %p", tpool);
+ DEBUG1("Destroy parmap %p", parmap);
- /* Lock the pool, then signal every worker an wait for each to finish */
- xbt_os_mutex_acquire(tpool->mutex);
- tpool->flags = TPOOL_DESTROY;
+ unsigned int i;
+
+ /* Lock the parmap, then signal every worker an wait for each to finish */
+ xbt_os_mutex_acquire(parmap->mutex);
+ for(i=0; i < parmap->num_workers; i++){
+ parmap->flags[i] = PARMAP_DESTROY;
+ }
- while(tpool->num_workers){
- DEBUG1("Still %u workers, waiting...", tpool->num_workers);
- xbt_os_cond_signal(tpool->job_posted);
- xbt_os_cond_wait(tpool->job_taken, tpool->mutex);
+ xbt_os_cond_broadcast(parmap->job_posted);
+ while(parmap->num_workers){
+ DEBUG1("Still %u workers, waiting...", parmap->num_workers);
+ xbt_os_cond_wait(parmap->all_done, parmap->mutex);
}
/* Destroy pool's data structures */
- xbt_os_cond_destroy(tpool->job_posted);
- xbt_os_cond_destroy(tpool->job_taken);
- xbt_os_cond_destroy(tpool->idle_worker);
- xbt_os_mutex_release(tpool->mutex);
- xbt_os_mutex_destroy(tpool->mutex);
- xbt_free(tpool);
+ xbt_os_cond_destroy(parmap->job_posted);
+ xbt_os_cond_destroy(parmap->all_done);
+ xbt_free(parmap->flags);
+ xbt_os_mutex_release(parmap->mutex);
+ xbt_os_mutex_destroy(parmap->mutex);
+ xbt_free(parmap);
}
-void xbt_tpool_queue_job(xbt_tpool_t tpool, void_f_pvoid_t fun, void* fun_arg)
+void xbt_parmap_apply(xbt_parmap_t parmap, void_f_pvoid_t fun, xbt_dynar_t data)
{
- s_xbt_tpool_job_t job;
- job.fun = fun;
- job.fun_arg = fun_arg;
+ unsigned int i;
+ unsigned int myflag_idx = parmap->num_workers;
- /* Wait until we can lock on the pool with some space on it for the job */
- xbt_os_mutex_acquire(tpool->mutex);
- while(xbt_dynar_length(tpool->jobs_queue) == tpool->max_jobs)
- xbt_os_cond_wait(tpool->job_taken, tpool->mutex);
+ /* Assign resources to worker threads */
+ xbt_os_mutex_acquire(parmap->mutex);
+ parmap->fun = fun;
+ parmap->data = data;
+ parmap->num_idle_workers = 0;
- DEBUG3("Queue job %p (%p) to thread pool %p", fun, fun_arg, tpool);
+ /* Set worker flags to work */
+ for(i=0; i < parmap->num_workers; i++){
+ parmap->flags[i] = PARMAP_WORK;
+ }
- /* Push the job in the queue, signal the workers and unlock the pool */
- xbt_dynar_push_as(tpool->jobs_queue, s_xbt_tpool_job_t, job);
- xbt_os_cond_signal(tpool->job_posted);
- xbt_os_mutex_release(tpool->mutex);
- return;
-}
+ /* Set our flag to wait (for the job to be completed)*/
+ parmap->flags[myflag_idx] = PARMAP_WAIT;
-void xbt_tpool_wait_all(xbt_tpool_t tpool)
-{
- DEBUG1("Wait all workers in thread pool %p", tpool);
- xbt_os_mutex_acquire(tpool->mutex);
+ /* Notify workers that there is a job */
+ xbt_os_cond_broadcast(parmap->job_posted);
+ DEBUG0("Job dispatched, lets wait...");
- while(tpool->num_idle_workers < tpool->num_workers
- || xbt_dynar_length(tpool->jobs_queue) > 0)
- xbt_os_cond_wait(tpool->idle_worker, tpool->mutex);
+ /* wait for the workers to finish */
+ while(parmap->flags[myflag_idx] == PARMAP_WAIT)
+ xbt_os_cond_wait(parmap->all_done, parmap->mutex);
- xbt_os_mutex_release(tpool->mutex);
- DEBUG1("Wait all workers done in thread pool %p", tpool);
+ DEBUG0("Job done");
+ parmap->fun = NULL;
+ parmap->data = NULL;
+
+ xbt_os_mutex_release(parmap->mutex);
return;
}
-static void *_xbt_tpool_worker_main(void *arg)
+static void *_xbt_parmap_worker_main(void *arg)
{
- s_xbt_tpool_job_t job;
- xbt_tpool_t tpool = (xbt_tpool_t)arg;
+ unsigned int data_start, data_end, data_size, worker_id;
+ xbt_parmap_t parmap = (xbt_parmap_t)arg;
- unsigned long i = tpoolcounter++; /* Debug purposes */
- DEBUG1("New worker thread created (%lu)", i);
-
+ /* Fetch a worker id */
+ xbt_os_mutex_acquire(parmap->mutex);
+ worker_id = parmap->workers_max_id++;
+ xbt_os_mutex_release(parmap->mutex);
+ DEBUG1("New worker thread created (%u)", worker_id);
+
/* Worker's main loop */
while(1){
- xbt_os_mutex_acquire(tpool->mutex);
-
- tpool->num_idle_workers++;
- xbt_os_cond_signal(tpool->idle_worker);
-
- /* If there are no jobs in the queue wait for one */
- while(xbt_dynar_length(tpool->jobs_queue) == 0
- && tpool->flags != TPOOL_DESTROY){
- DEBUG1("Worker %lu waiting for a job", i);
- xbt_os_cond_wait(tpool->job_posted, tpool->mutex);
+ xbt_os_mutex_acquire(parmap->mutex);
+ parmap->flags[worker_id] = PARMAP_WAIT;
+ parmap->num_idle_workers++;
+
+ /* If everybody is done set the parmap work flag and signal it */
+ if(parmap->num_idle_workers == parmap->num_workers){
+ DEBUG1("Worker %u: All done, signal the parmap", worker_id);
+ parmap->flags[parmap->num_workers] = PARMAP_WORK;
+ xbt_os_cond_signal(parmap->all_done);
}
- DEBUG1("Worker %lu got a job", i);
+ /* If the wait flag is set then ... wait. */
+ while(parmap->flags[worker_id] == PARMAP_WAIT)
+ xbt_os_cond_wait(parmap->job_posted, parmap->mutex);
- /* If we are shutting down, signal the destroyer so it can kill the other */
- /* workers, unlock the pool and return */
- if(tpool->flags == TPOOL_DESTROY){
- DEBUG1("Shutting down worker %lu", i);
- tpool->num_idle_workers--;
- tpool->num_workers--;
- xbt_os_cond_signal(tpool->job_taken);
- xbt_os_mutex_release(tpool->mutex);
+ DEBUG1("Worker %u got a job", worker_id);
+
+ /* If we are shutting down, the last worker is going to signal the
+ * parmap so it can finish destroying the data structure */
+ if(parmap->flags[worker_id] == PARMAP_DESTROY){
+ DEBUG1("Shutting down worker %u", worker_id);
+ parmap->num_workers--;
+ if(parmap->num_workers == 0)
+ xbt_os_cond_signal(parmap->all_done);
+ xbt_os_mutex_release(parmap->mutex);
return NULL;
}
+ xbt_os_mutex_release(parmap->mutex);
- /* Get a job, signal the pool to inform jobs submitters and unlock it */
- job = xbt_dynar_pop_as(tpool->jobs_queue, s_xbt_tpool_job_t);
- xbt_os_cond_signal(tpool->job_taken);
- tpool->num_idle_workers--;
- xbt_os_mutex_release(tpool->mutex);
-
- /* Run the job and loop again ... */
- job.fun(job.fun_arg);
+ /* Compute how much data does every worker gets */
+ data_size = (xbt_dynar_length(parmap->data) / parmap->num_workers)
+ + ((xbt_dynar_length(parmap->data) % parmap->num_workers) ? 1 : 0);
+
+ /* Each worker data segment starts in a position associated with its id*/
+ data_start = data_size * worker_id;
+
+ /* The end of the worker data segment must be bounded by the end of the data vector */
+ data_end = MIN(data_start + data_size, xbt_dynar_length(parmap->data));
+
+ DEBUG4("Worker %u: data_start=%u data_end=%u (data_size=%u)", worker_id, data_start, data_end, data_size);
+
+ /* While the worker don't pass the end of it data segment apply the function */
+ while(data_start < data_end){
+ parmap->fun(*(void **)xbt_dynar_get_ptr(parmap->data, data_start));
+ data_start++;
+ }
}
}
#include "xbt.h"
#include "xbt/ex.h"
-XBT_TEST_SUITE("tpool", "Thread pool");
+XBT_TEST_SUITE("parmap", "Parallel Map");
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_parmap_unit, xbt,
+ "unit parmap");
+
-xbt_tpool_t tpool;
+xbt_parmap_t parmap;
-void job(void *arg);
+void fun(void *arg);
-void job (void *arg)
+void fun(void *arg)
{
- xbt_test_log1("I'm job %lu", (unsigned long)arg);
+ INFO1("I'm job %lu", (unsigned long)arg);
}
-XBT_TEST_UNIT("basic", test_tpool_basic, "Basic usage")
+XBT_TEST_UNIT("basic", test_parmap_basic, "Basic usage")
{
- xbt_test_add0("Create thread pool");
+ xbt_test_add0("Create the parmap");
- unsigned long i,j;
- /* Create thread pool */
- tpool = xbt_tpool_new(5, 10);
+ unsigned long j;
+ xbt_dynar_t data = xbt_dynar_new(sizeof(void *), NULL);
- for(j=0; j < 10; j++){
- /* Queue some work */
- for(i=0; i < 20; i++){
- xbt_tpool_queue_job(tpool, job, (void*)i);
- }
- /* Wait for everyone */
- xbt_tpool_wait_all(tpool);
+ /* Create the parallel map */
+ parmap = xbt_parmap_new(5);
+
+ for(j=0; j < 200; j++){
+ xbt_dynar_push_as(data, void *, (void *)j);
}
- /* Destroy thread pool */
- xbt_tpool_destroy(tpool);
+ xbt_parmap_apply(parmap, fun, data);
+
+ /* Destroy the parmap */
+ xbt_parmap_destroy(parmap);
}
#endif /* SIMGRID_TEST */
