1 /* Copyright (c) 2004, 2005, 2007, 2009, 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "gras_config.h"
9 #include <sys/syscall.h>
13 #include <linux/futex.h>
15 #include "xbt/xbt_os_thread.h"
18 #include "parmap_private.h"
20 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_parmap, xbt, "parmap: parallel map");
21 XBT_LOG_NEW_SUBCATEGORY(xbt_parmap_unit, xbt_parmap, "parmap unit testing");
23 static void *_xbt_parmap_worker_main(void *parmap);
25 static void futex_wait(int *uaddr, int val);
26 static void futex_wake(int *uaddr, int val);
28 xbt_parmap_t xbt_parmap_new(unsigned int num_workers)
31 xbt_os_thread_t worker = NULL;
33 XBT_DEBUG("Create new parmap (%u workers)", num_workers);
35 /* Initialize the thread pool data structure */
36 xbt_parmap_t parmap = xbt_new0(s_xbt_parmap_t, 1);
38 parmap->sync_event = xbt_new0(s_xbt_event_t, 1);
40 parmap->num_workers = num_workers;
41 parmap->status = PARMAP_WORK;
43 parmap->sync_event->threads_to_wait = num_workers;
45 /* Create the pool of worker threads */
46 for(i=0; i < num_workers; i++){
47 worker = xbt_os_thread_create(NULL, _xbt_parmap_worker_main, parmap, NULL);
48 xbt_os_thread_detach(worker);
51 xbt_event_init(parmap->sync_event);
56 void xbt_parmap_destroy(xbt_parmap_t parmap)
58 XBT_DEBUG("Destroy parmap %p", parmap);
59 parmap->status = PARMAP_DESTROY;
61 xbt_event_signal(parmap->sync_event);
62 xbt_free(parmap->sync_event);
67 void xbt_parmap_apply(xbt_parmap_t parmap, void_f_pvoid_t fun, xbt_dynar_t data)
69 /* Assign resources to worker threads*/
74 xbt_event_signal(parmap->sync_event);
76 XBT_DEBUG("Job done");
79 static void *_xbt_parmap_worker_main(void *arg)
81 unsigned int worker_id;
82 xbt_parmap_t parmap = (xbt_parmap_t)arg;
84 /* Fetch a worker id */
85 worker_id = __sync_fetch_and_add(&parmap->workers_max_id, 1);
86 xbt_os_thread_set_extra_data((void *)(unsigned long)worker_id);
88 XBT_DEBUG("New worker thread created (%u)", worker_id);
90 /* Worker's main loop */
93 xbt_event_wait(parmap->sync_event);
95 if (parmap->status == PARMAP_WORK) {
97 XBT_DEBUG("Worker %u got a job", worker_id);
99 unsigned int i = __sync_fetch_and_add(&parmap->index, 1);
100 if (i < xbt_dynar_length(parmap->data)) {
101 parmap->fun(xbt_dynar_get_as(parmap->data, i, void*));
104 XBT_DEBUG("Worker %u has finished", worker_id);
106 /* We are destroying the parmap */
109 xbt_event_end(parmap->sync_event);
111 XBT_DEBUG("Shutting down worker %u", worker_id);
118 static void futex_wait(int *uaddr, int val)
120 XBT_VERB("Waiting on futex %p", uaddr);
121 syscall(SYS_futex, uaddr, FUTEX_WAIT_PRIVATE, val, NULL, NULL, 0);
124 static void futex_wake(int *uaddr, int val)
126 XBT_VERB("Waking futex %p", uaddr);
127 syscall(SYS_futex, uaddr, FUTEX_WAKE_PRIVATE, val, NULL, NULL, 0);
130 void xbt_event_init(xbt_event_t event)
132 int myflag = event->done;
133 if(event->thread_counter < event->threads_to_wait)
134 futex_wait(&event->done, myflag);
137 void xbt_event_signal(xbt_event_t event)
139 int myflag = event->done;
140 event->thread_counter = 0;
142 futex_wake(&event->work, event->threads_to_wait);
143 futex_wait(&event->done, myflag);
146 void xbt_event_wait(xbt_event_t event)
149 unsigned int mycount;
151 myflag = event->work;
152 mycount = __sync_add_and_fetch(&event->thread_counter, 1);
153 if(mycount == event->threads_to_wait){
155 futex_wake(&event->done, 1);
158 futex_wait(&event->work, myflag);
161 void xbt_event_end(xbt_event_t event)
163 unsigned int mycount;
165 mycount = __sync_add_and_fetch(&event->thread_counter, 1);
166 if(mycount == event->threads_to_wait){
168 futex_wake(&event->done, 1);
177 XBT_TEST_SUITE("parmap", "Parallel Map");
178 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(xbt_parmap_unit);
188 //XBT_INFO("I'm job %lu", (unsigned long)arg);
191 XBT_TEST_UNIT("basic", test_parmap_basic, "Basic usage")
193 xbt_test_add("Create the parmap");
196 xbt_dynar_t data = xbt_dynar_new(sizeof(void *), NULL);
198 /* Create the parallel map */
199 parmap = xbt_parmap_new(10);
201 for(j=0; j < 100; j++){
202 xbt_dynar_push_as(data, void *, (void *)j);
206 xbt_parmap_apply(parmap, fun, data);
208 /* Destroy the parmap */
209 xbt_parmap_destroy(parmap);
210 xbt_dynar_free(&data);
213 #endif /* SIMGRID_TEST */