X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/dee60c06c65803e929391a0102697323bda033e4..dbfa5606c9912e09908b3343ec7a56b283ec82b9:/src/simix/smx_context.c

diff --git a/src/simix/smx_context.c b/src/simix/smx_context.c
index 06f0cbbd4e..2da152b007 100644
--- a/src/simix/smx_context.c
+++ b/src/simix/smx_context.c
@@ -11,6 +11,7 @@
 #include "xbt/swag.h"
 #include "private.h"
 #include "simix/context.h"
+#include "gras_config.h"
 
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix,
                                 "Context switching mecanism");
@@ -18,7 +19,14 @@ XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix,
 char* smx_context_factory_name = NULL; /* factory name specified by --cfg=contexts/factory:value */
 smx_ctx_factory_initializer_t smx_factory_initializer_to_use = NULL;
 int smx_context_stack_size = 128 * 1024;
+
+#ifdef CONTEXT_THREADS
+__thread smx_context_t smx_current_context;
+#else
 smx_context_t smx_current_context;
+#endif
+
+static int smx_parallel_contexts = 1;
 
 /** 
  * This function is called by SIMIX_global_init() to initialize the context module.
@@ -64,3 +72,38 @@ void SIMIX_context_mod_exit(void)
   }
   xbt_dict_remove((xbt_dict_t) _surf_cfg_set,"contexts/factory");
 }
+
+/**
+ * \brief Sets the number of parallel threads to use
+ * for the user contexts.
+ *
+ * This function should be called before initializing SIMIX.
+ * A value of 1 means no parallelism.
+ * If the value is greater than 1, the thread support must be enabled.
+ *
+ * \param nb_threads the number of threads to use
+ */
+void SIMIX_context_set_nthreads(int nb_threads) {
+
+  xbt_assert1(nb_threads > 0, "Invalid number of parallel threads: %d", nb_threads);
+  smx_parallel_contexts = nb_threads;
+}
+
+/**
+ * \brief Returns the number of parallel threads used
+ * for the user contexts.
+ * \return the number of threads (1 means no parallelism)
+ */
+int SIMIX_context_get_nthreads(void) {
+  return smx_parallel_contexts;
+}
+
+/**
+ * \brief Returns whether some parallel threads are used
+ * for the user contexts.
+ * \return 1 if parallelism is used
+ */
+int SIMIX_context_is_parallel(void) {
+  return smx_parallel_contexts > 1;
+}
+