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 parmap->status = PARMAP_DESTROY;
60 xbt_event_signal(parmap->sync_event);
61 xbt_free(parmap->sync_event);
66 void xbt_parmap_apply(xbt_parmap_t parmap, void_f_pvoid_t fun, xbt_dynar_t data)
68 /* Assign resources to worker threads*/
73 xbt_event_signal(parmap->sync_event);
75 XBT_DEBUG("Job done");
78 void* xbt_parmap_next(xbt_parmap_t parmap) {
80 unsigned int index = __sync_fetch_and_add(&parmap->index, 1);
81 if (index < xbt_dynar_length(parmap->data)) {
82 return xbt_dynar_get_as(parmap->data, index, void*);
87 unsigned long xbt_parmap_get_worker_id(xbt_parmap_t parmap) {
88 return (unsigned long) xbt_os_thread_get_extra_data();
91 static void *_xbt_parmap_worker_main(void *arg)
93 unsigned int worker_id;
94 xbt_parmap_t parmap = (xbt_parmap_t) arg;
96 /* Fetch a worker id */
97 worker_id = __sync_fetch_and_add(&parmap->workers_max_id, 1);
98 xbt_os_thread_set_extra_data((void*) (unsigned long) worker_id);
100 XBT_DEBUG("New worker thread created (%u)", worker_id);
102 /* Worker's main loop */
105 xbt_event_wait(parmap->sync_event);
107 if (parmap->status == PARMAP_WORK) {
109 XBT_DEBUG("Worker %u got a job", worker_id);
111 void* work = xbt_parmap_next(parmap);
116 XBT_DEBUG("Worker %u has finished", worker_id);
118 /* We are destroying the parmap */
121 xbt_event_end(parmap->sync_event);
123 XBT_DEBUG("Shutting down worker %u", worker_id);
130 static void futex_wait(int *uaddr, int val)
132 XBT_VERB("Waiting on futex %p", uaddr);
133 syscall(SYS_futex, uaddr, FUTEX_WAIT_PRIVATE, val, NULL, NULL, 0);
136 static void futex_wake(int *uaddr, int val)
138 XBT_VERB("Waking futex %p", uaddr);
139 syscall(SYS_futex, uaddr, FUTEX_WAKE_PRIVATE, val, NULL, NULL, 0);
142 void xbt_event_init(xbt_event_t event)
144 int myflag = event->done;
145 if(event->thread_counter < event->threads_to_wait)
146 futex_wait(&event->done, myflag);
149 void xbt_event_signal(xbt_event_t event)
151 int myflag = event->done;
152 event->thread_counter = 0;
154 futex_wake(&event->work, event->threads_to_wait);
155 futex_wait(&event->done, myflag);
158 void xbt_event_wait(xbt_event_t event)
161 unsigned int mycount;
163 myflag = event->work;
164 mycount = __sync_add_and_fetch(&event->thread_counter, 1);
165 if(mycount == event->threads_to_wait){
167 futex_wake(&event->done, 1);
170 futex_wait(&event->work, myflag);
173 void xbt_event_end(xbt_event_t event)
175 unsigned int mycount;
177 mycount = __sync_add_and_fetch(&event->thread_counter, 1);
178 if(mycount == event->threads_to_wait){
180 futex_wake(&event->done, 1);
189 XBT_TEST_SUITE("parmap", "Parallel Map");
190 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(xbt_parmap_unit);
200 //XBT_INFO("I'm job %lu", (unsigned long)arg);
203 XBT_TEST_UNIT("basic", test_parmap_basic, "Basic usage")
205 xbt_test_add("Create the parmap");
208 xbt_dynar_t data = xbt_dynar_new(sizeof(void *), NULL);
210 /* Create the parallel map */
211 parmap = xbt_parmap_new(10);
213 for(j=0; j < 100; j++){
214 xbt_dynar_push_as(data, void *, (void *)j);
218 xbt_parmap_apply(parmap, fun, data);
220 /* Destroy the parmap */
221 xbt_parmap_destroy(parmap);
222 xbt_dynar_free(&data);
225 #endif /* SIMGRID_TEST */