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"
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 void xbt_event_init(xbt_event_t event);
41 void xbt_event_signal(xbt_event_t event);
42 void xbt_event_wait(xbt_event_t event);
43 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);
63 xbt_parmap_t xbt_parmap_new(unsigned int num_workers)
66 xbt_os_thread_t worker = NULL;
68 XBT_DEBUG("Create new parmap (%u workers)", num_workers);
70 /* Initialize the thread pool data structure */
71 xbt_parmap_t parmap = xbt_new0(s_xbt_parmap_t, 1);
73 parmap->sync_event = xbt_new0(s_xbt_event_t, 1);
75 parmap->num_workers = num_workers;
76 parmap->status = PARMAP_WORK;
78 parmap->sync_event->threads_to_wait = num_workers;
80 /* Create the pool of worker threads */
81 for(i=0; i < num_workers; i++){
82 worker = xbt_os_thread_create(NULL, _xbt_parmap_worker_main, parmap, NULL);
83 xbt_os_thread_detach(worker);
86 xbt_event_init(parmap->sync_event);
91 void xbt_parmap_destroy(xbt_parmap_t parmap)
93 parmap->status = PARMAP_DESTROY;
95 xbt_event_signal(parmap->sync_event);
96 xbt_free(parmap->sync_event);
101 void xbt_parmap_apply(xbt_parmap_t parmap, void_f_pvoid_t fun, xbt_dynar_t data)
103 /* Assign resources to worker threads*/
108 xbt_event_signal(parmap->sync_event);
110 XBT_DEBUG("Job done");
113 void* xbt_parmap_next(xbt_parmap_t parmap) {
115 unsigned int index = __sync_fetch_and_add(&parmap->index, 1);
116 if (index < xbt_dynar_length(parmap->data)) {
117 return xbt_dynar_get_as(parmap->data, index, void*);
122 unsigned long xbt_parmap_get_worker_id(xbt_parmap_t parmap) {
123 return (unsigned long) xbt_os_thread_get_extra_data();
126 static void *_xbt_parmap_worker_main(void *arg)
128 unsigned int worker_id;
129 xbt_parmap_t parmap = (xbt_parmap_t) arg;
131 /* Fetch a worker id */
132 worker_id = __sync_fetch_and_add(&parmap->workers_max_id, 1);
133 xbt_os_thread_set_extra_data((void*) (unsigned long) worker_id);
135 XBT_DEBUG("New worker thread created (%u)", worker_id);
137 /* Worker's main loop */
140 xbt_event_wait(parmap->sync_event);
142 if (parmap->status == PARMAP_WORK) {
144 XBT_DEBUG("Worker %u got a job", worker_id);
146 void* work = xbt_parmap_next(parmap);
151 XBT_DEBUG("Worker %u has finished", worker_id);
153 /* We are destroying the parmap */
156 xbt_event_end(parmap->sync_event);
158 XBT_DEBUG("Shutting down worker %u", worker_id);
165 static void futex_wait(int *uaddr, int val)
167 XBT_VERB("Waiting on futex %p", uaddr);
168 syscall(SYS_futex, uaddr, FUTEX_WAIT_PRIVATE, val, NULL, NULL, 0);
171 static void futex_wake(int *uaddr, int val)
173 XBT_VERB("Waking futex %p", uaddr);
174 syscall(SYS_futex, uaddr, FUTEX_WAKE_PRIVATE, val, NULL, NULL, 0);
177 void xbt_event_init(xbt_event_t event)
179 int myflag = event->done;
180 if(event->thread_counter < event->threads_to_wait)
181 futex_wait(&event->done, myflag);
184 void xbt_event_signal(xbt_event_t event)
186 int myflag = event->done;
187 event->thread_counter = 0;
189 futex_wake(&event->work, event->threads_to_wait);
190 futex_wait(&event->done, myflag);
193 void xbt_event_wait(xbt_event_t event)
196 unsigned int mycount;
198 myflag = event->work;
199 mycount = __sync_add_and_fetch(&event->thread_counter, 1);
200 if(mycount == event->threads_to_wait){
202 futex_wake(&event->done, 1);
205 futex_wait(&event->work, myflag);
208 void xbt_event_end(xbt_event_t event)
210 unsigned int mycount;
212 mycount = __sync_add_and_fetch(&event->thread_counter, 1);
213 if(mycount == event->threads_to_wait){
215 futex_wake(&event->done, 1);
224 XBT_TEST_SUITE("parmap", "Parallel Map");
225 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(xbt_parmap_unit);
235 //XBT_INFO("I'm job %lu", (unsigned long)arg);
238 XBT_TEST_UNIT("basic", test_parmap_basic, "Basic usage")
240 xbt_test_add("Create the parmap");
243 xbt_dynar_t data = xbt_dynar_new(sizeof(void *), NULL);
245 /* Create the parallel map */
246 parmap = xbt_parmap_new(10);
248 for(j=0; j < 100; j++){
249 xbt_dynar_push_as(data, void *, (void *)j);
253 xbt_parmap_apply(parmap, fun, data);
255 /* Destroy the parmap */
256 xbt_parmap_destroy(parmap);
257 xbt_dynar_free(&data);
260 #endif /* SIMGRID_TEST */