X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/390e66390d95e36cd30d7593485e13932586b743..5f6cef8bdac64b84b4886b2f2c6a89b65763dc09:/src/xbt/xbt_synchro.c

diff --git a/src/xbt/xbt_synchro.c b/src/xbt/xbt_synchro.c
index 7aa1cc098d..5b78e0a0cf 100644
--- a/src/xbt/xbt_synchro.c
+++ b/src/xbt/xbt_synchro.c
@@ -1,7 +1,8 @@
 /* xbt_synchro -- advanced multithreaded features                           */
 /* Working on top of real threads in RL and of simulated processes in SG    */
 
-/* Copyright 2009 Da SimGrid Team. All right reserved.                      */
+/* Copyright (c) 2009, 2010. The SimGrid Team.
+ * All rights reserved.                                                     */
 
 /* 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. */
@@ -9,37 +10,52 @@
 #include "xbt/sysdep.h"
 #include "xbt/dynar.h"
 #include "xbt/synchro.h"
+XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(xbt_sync);
 
 typedef struct {
   xbt_dynar_t data;
   int rank;
   void_f_int_pvoid_t function;
   xbt_thread_t worker;
-} s_worker_data_t,*worker_data_t;
+} s_worker_data_t, *worker_data_t;
 
-static void worker_wait_n_free(void*w) {
-  worker_data_t worker=*(worker_data_t*)w;
+static void worker_wait_n_free(void *w)
+{
+  worker_data_t worker = *(worker_data_t *) w;
   xbt_thread_join(worker->worker);
   xbt_free(worker);
 }
-static void worker_wrapper(void *w) {
-  worker_data_t me=(worker_data_t)w;
-  (*me->function)(me->rank,xbt_dynar_get_ptr(me->data,me->rank));
-  xbt_thread_exit();
+
+static void worker_wrapper(void *w)
+{
+  worker_data_t me = (worker_data_t) w;
+  (*me->function) (me->rank, xbt_dynar_get_ptr(me->data, me->rank));
 }
 
-void xbt_dynar_dopar(xbt_dynar_t datas, void_f_int_pvoid_t function) {
-  xbt_dynar_t workers = xbt_dynar_new(sizeof(worker_data_t),worker_wait_n_free);
+void xbt_dynar_dopar(xbt_dynar_t datas, void_f_int_pvoid_t function)
+{
+  xbt_dynar_t workers =
+      xbt_dynar_new(sizeof(worker_data_t), worker_wait_n_free);
   unsigned int cursor;
   void *data;
+  if (xbt_dynar_length(datas) == 0)
+    return;                     /* nothing to do */
+  if (xbt_dynar_length(datas) == 1) {
+    /* don't start any new thread, do it directly */
+    (*function) (0, xbt_dynar_get_ptr(datas, 0));
+    return;
+  }
   /* Start all workers */
-  xbt_dynar_foreach(datas,cursor,data){
-    worker_data_t w = xbt_new0(s_worker_data_t,1);
+  XBT_DEBUG("Dopar for %ld elements", xbt_dynar_length(datas));
+  xbt_dynar_foreach(datas, cursor, data) {
+    worker_data_t w = xbt_new0(s_worker_data_t, 1);
     w->data = datas;
     w->function = function;
-    w->rank=cursor;
-    xbt_dynar_push(workers,&w);
-    w->worker = xbt_thread_create("dopar worker",worker_wrapper,w);
+    w->rank = cursor;
+    xbt_dynar_push(workers, &w);
+    w->worker =
+        xbt_thread_create("dopar worker", worker_wrapper, w,
+                          1 /*joinable */ );
   }
   /* wait them all */
   xbt_dynar_free(&workers);
@@ -53,9 +69,10 @@ XBT_TEST_SUITE("synchro", "Advanced synchronization mecanisms");
 XBT_LOG_EXTERNAL_CATEGORY(xbt_dyn);
 XBT_LOG_DEFAULT_CATEGORY(xbt_dyn);
 
-static void add100(int rank,void *data) {
-  //INFO2("Thread%d: Add 100 to %d",rank,*(int*)data);
-  *(int*)data +=100;
+static void add100(int rank, void *data)
+{
+  //XBT_INFO("Thread%d: Add 100 to %d",rank,*(int*)data);
+  *(int *) data += 100;
 }
 
 XBT_TEST_UNIT("dopar", test_dynar_dopar, "do parallel on dynars of integers")
@@ -64,16 +81,18 @@ XBT_TEST_UNIT("dopar", test_dynar_dopar, "do parallel on dynars of integers")
   int i, cpt;
   unsigned int cursor;
 
-  xbt_test_add1("==== Push %d int, add 100 to each of them in parallel and check the results", NB_ELEM);
+  xbt_test_add
+      ("==== Push %d int, add 100 to each of them in parallel and check the results",
+       NB_ELEM);
   d = xbt_dynar_new(sizeof(int), NULL);
   for (cpt = 0; cpt < NB_ELEM; cpt++) {
     xbt_dynar_push_as(d, int, cpt);     /* This is faster (and possible only with scalars) */
-    xbt_test_log2("Push %d, length=%lu", cpt, xbt_dynar_length(d));
+    xbt_test_log("Push %d, length=%lu", cpt, xbt_dynar_length(d));
   }
-  xbt_dynar_dopar(d,add100);
+  xbt_dynar_dopar(d, add100);
   cpt = 100;
   xbt_dynar_foreach(d, cursor, i) {
-    xbt_test_assert2(i == cpt,
+    xbt_test_assert(i == cpt,
                      "The retrieved value is not the expected one (%d!=%d)",
                      i, cpt);
     cpt++;
@@ -81,6 +100,4 @@ XBT_TEST_UNIT("dopar", test_dynar_dopar, "do parallel on dynars of integers")
   xbt_dynar_free(&d);
 }
 
-#endif /* SIMGRID_TEST */
-
-
+#endif                          /* SIMGRID_TEST */