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"
10 #include <sys/syscall.h>
14 #include <linux/futex.h>
17 #include "xbt/parmap.h"
19 #include "xbt/function_types.h"
20 #include "xbt/dynar.h"
21 #include "xbt/xbt_os_thread.h"
22 #include "xbt/sysdep.h"
24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_parmap, xbt, "parmap: parallel map");
25 XBT_LOG_NEW_SUBCATEGORY(xbt_parmap_unit, xbt_parmap, "parmap unit testing");
30 } e_xbt_parmap_flag_t;
33 typedef struct s_xbt_event {
36 unsigned int thread_counter;
37 unsigned int threads_to_wait;
38 } s_xbt_event_t, *xbt_event_t;
40 static void xbt_event_init(xbt_event_t event);
41 static void xbt_event_signal(xbt_event_t event);
42 static void xbt_event_wait(xbt_event_t event);
43 static void xbt_event_end(xbt_event_t event);
46 typedef struct s_xbt_parmap {
47 e_xbt_parmap_flag_t status;
49 xbt_event_t sync_event;
51 unsigned int num_workers;
52 unsigned int workers_max_id;
58 static void *_xbt_parmap_worker_main(void *parmap);
60 static void futex_wait(int *uaddr, int val);
61 static void futex_wake(int *uaddr, int val);
64 xbt_parmap_t xbt_parmap_new(unsigned int num_workers)
67 xbt_os_thread_t worker = NULL;
69 XBT_DEBUG("Create new parmap (%u workers)", num_workers);
71 /* Initialize the thread pool data structure */
72 xbt_parmap_t parmap = xbt_new0(s_xbt_parmap_t, 1);
74 parmap->sync_event = xbt_new0(s_xbt_event_t, 1);
76 parmap->num_workers = num_workers;
77 parmap->status = PARMAP_WORK;
79 parmap->sync_event->threads_to_wait = num_workers;
81 /* Create the pool of worker threads */
82 for (i = 0; i < num_workers; i++) {
83 worker = xbt_os_thread_create(NULL, _xbt_parmap_worker_main, parmap, NULL);
84 xbt_os_thread_detach(worker);
87 xbt_event_init(parmap->sync_event);
92 void xbt_parmap_destroy(xbt_parmap_t parmap)
94 parmap->status = PARMAP_DESTROY;
96 xbt_event_signal(parmap->sync_event);
97 xbt_free(parmap->sync_event);
102 void xbt_parmap_apply(xbt_parmap_t parmap, void_f_pvoid_t fun, xbt_dynar_t data)
104 /* Assign resources to worker threads*/
109 xbt_event_signal(parmap->sync_event);
111 XBT_DEBUG("Job done");
114 void* xbt_parmap_next(xbt_parmap_t parmap)
116 unsigned int index = __sync_fetch_and_add(&parmap->index, 1);
117 if (index < xbt_dynar_length(parmap->data)) {
118 return xbt_dynar_get_as(parmap->data, index, void*);
123 unsigned long xbt_parmap_get_worker_id(xbt_parmap_t parmap)
125 return (unsigned long) xbt_os_thread_get_extra_data();
128 static void *_xbt_parmap_worker_main(void *arg)
130 unsigned int worker_id;
131 xbt_parmap_t parmap = (xbt_parmap_t) arg;
133 /* Fetch a worker id */
134 worker_id = __sync_fetch_and_add(&parmap->workers_max_id, 1);
135 xbt_os_thread_set_extra_data((void*) (unsigned long) worker_id);
137 XBT_DEBUG("New worker thread created (%u)", worker_id);
139 /* Worker's main loop */
142 xbt_event_wait(parmap->sync_event);
144 if (parmap->status == PARMAP_WORK) {
146 XBT_DEBUG("Worker %u got a job", worker_id);
148 void* work = xbt_parmap_next(parmap);
153 XBT_DEBUG("Worker %u has finished", worker_id);
155 /* We are destroying the parmap */
158 xbt_event_end(parmap->sync_event);
160 XBT_DEBUG("Shutting down worker %u", worker_id);
167 static void futex_wait(int *uaddr, int val)
169 XBT_VERB("Waiting on futex %p", uaddr);
170 syscall(SYS_futex, uaddr, FUTEX_WAIT_PRIVATE, val, NULL, NULL, 0);
173 static void futex_wake(int *uaddr, int val)
175 XBT_VERB("Waking futex %p", uaddr);
176 syscall(SYS_futex, uaddr, FUTEX_WAKE_PRIVATE, val, NULL, NULL, 0);
179 static void xbt_event_init(xbt_event_t event)
181 int myflag = event->done;
182 if (event->thread_counter < event->threads_to_wait) {
183 futex_wait(&event->done, myflag);
187 static void xbt_event_signal(xbt_event_t event)
189 int myflag = event->done;
190 event->thread_counter = 0;
192 futex_wake(&event->work, event->threads_to_wait);
193 futex_wait(&event->done, myflag);
196 static void xbt_event_wait(xbt_event_t event)
199 unsigned int mycount;
201 myflag = event->work;
202 mycount = __sync_add_and_fetch(&event->thread_counter, 1);
203 if (mycount == event->threads_to_wait) {
205 futex_wake(&event->done, 1);
208 futex_wait(&event->work, myflag);
211 static void xbt_event_end(xbt_event_t event)
213 unsigned int mycount;
215 mycount = __sync_add_and_fetch(&event->thread_counter, 1);
216 if (mycount == event->threads_to_wait) {
218 futex_wake(&event->done, 1);
227 XBT_TEST_SUITE("parmap", "Parallel Map");
228 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(xbt_parmap_unit);
236 //XBT_INFO("I'm job %lu", (unsigned long)arg);
239 XBT_TEST_UNIT("basic", test_parmap_basic, "Basic usage")
241 xbt_test_add("Create the parmap");
244 xbt_dynar_t data = xbt_dynar_new(sizeof(void *), NULL);
246 /* Create the parallel map */
247 parmap = xbt_parmap_new(10);
249 for(j = 0; j < 100; j++) {
250 xbt_dynar_push_as(data, void *, (void *)j);
253 for (i = 0; i < 5; i++) {
254 xbt_parmap_apply(parmap, fun, data);
257 /* Destroy the parmap */
258 xbt_parmap_destroy(parmap);
259 xbt_dynar_free(&data);
262 #endif /* SIMGRID_TEST */