#include "xbt/log.h"
#include "xbt/swag.h"
#include "private.h"
-
-#ifdef HAVE_LUA
-#include <lauxlib.h>
-#endif
-
-#ifdef HAVE_RUBY
-void SIMIX_ctx_ruby_factory_init(smx_context_factory_t * factory);
-#endif
+#include "simix/context.h"
+#include "gras_config.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_context, simix,
"Context switching mecanism");
-const char *xbt_ctx_factory_to_use = NULL;
+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;
+static int smx_parallel_threshold = 1;
/**
- * This function is call by SIMIX_global_init() to initialize the context module.
+ * This function is called by SIMIX_global_init() to initialize the context module.
*/
-
void SIMIX_context_mod_init(void)
{
if (!simix_global->context_factory) {
- /* select context factory to use to create the context(depends of the macro definitions) */
- if (xbt_ctx_factory_to_use) {
- SIMIX_context_select_factory(xbt_ctx_factory_to_use);
- } else {
-#ifdef CONTEXT_THREADS
- /* context switch based os thread */
- SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
-#elif defined(CONTEXT_UCONTEXT)
- /* context switch based ucontext */
- SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
-#elif defined(_XBT_WIN32)
- /* context switch based windows */
+ /* select the context factory to use to create the contexts */
+ if (smx_factory_initializer_to_use) {
+ (*smx_factory_initializer_to_use)(&(simix_global->context_factory));
+ }
+ else { /* use the factory specified by --cfg=contexts/factory:value */
+
+ if (smx_context_factory_name == NULL) {
+ /* use the default factory */
+#ifdef CONTEXT_UCONTEXT
+ SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
+#else
+ SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
+#endif
+ }
+ else if (!strcmp(smx_context_factory_name, "ucontext")) {
+ /* use ucontext */
+#ifdef CONTEXT_UCONTEXT
+ SIMIX_ctx_sysv_factory_init(&simix_global->context_factory);
#else
- /* context switch is not allowed on Windows */
-#error ERROR [__FILE__, line __LINE__]: no context based implementation specified.
+ xbt_die("The ontext factory 'ucontext' unavailable on your system");
#endif
+ }
+ else if (!strcmp(smx_context_factory_name, "thread")) {
+ /* use os threads (either pthreads or windows ones) */
+ SIMIX_ctx_thread_factory_init(&simix_global->context_factory);
+ }
+ else if (!strcmp(smx_context_factory_name, "raw")) {
+ /* use raw contexts */
+ SIMIX_ctx_raw_factory_init(&simix_global->context_factory);
+ }
+ else {
+ xbt_die("Invalid context factory specified");
+ }
}
}
}
finalize_factory = simix_global->context_factory->finalize;
(*finalize_factory) (&simix_global->context_factory);
}
+ xbt_dict_remove((xbt_dict_t) _surf_cfg_set,"contexts/factory");
}
/**
- * This function is used to change the context factory.
- * Warning: it destroy all the existing processes (even for maestro), and it
- * will create a new maestro process using the new context 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
*/
-int SIMIX_context_select_factory(const char *name)
-{
- /* if a context factory is already instantiated and it is different from the
- newly selected one, then kill all the processes, exit the context module
- and initialize the new factory.
- */
-
-
- if (simix_global->context_factory != NULL) {
- if (strcmp(simix_global->context_factory->name, name)) {
+XBT_INLINE void SIMIX_context_set_nthreads(int nb_threads) {
- SIMIX_process_killall();
+ xbt_assert(nb_threads > 0, "Invalid number of parallel threads: %d", nb_threads);
- /* kill maestro process */
- SIMIX_context_free(simix_global->maestro_process->context);
- free(simix_global->maestro_process);
- simix_global->maestro_process = NULL;
-
- SIMIX_context_mod_exit();
- } else
- /* the same context factory is requested return directly */
- return 0;
+ if (nb_threads > 1) {
+#ifndef CONTEXT_THREADS
+ THROWF(arg_error, 0, "No thread support for parallel context execution");
+#endif
}
- /* init the desired factory */
- SIMIX_context_init_factory_by_name(&simix_global->context_factory, name);
-
- SIMIX_create_maestro_process();
-
-
-
- return 0;
+ smx_parallel_contexts = nb_threads;
}
/**
- * Initializes a context factory given by its name
+ * \brief Returns the number of parallel threads used
+ * for the user contexts.
+ * \return the number of threads (1 means no parallelism)
*/
-void SIMIX_context_init_factory_by_name(smx_context_factory_t * factory,
- const char *name)
-{
-
- if (!strcmp(name, "java"))
-#ifdef HAVE_JAVA
- SIMIX_ctx_java_factory_init(factory);
-#else
- THROW0(not_found_error, 0,
- "Factory 'Java' does not exist: Java support was not compiled in the SimGrid library");
-#endif /* HAVE_JAVA */
-
- else if (!strcmp(name, "thread"))
-#ifdef CONTEXT_THREADS
- SIMIX_ctx_thread_factory_init(factory);
-#else
- THROW0(not_found_error, 0,
- "Factory 'thread' does not exist: thread support was not compiled in the SimGrid library");
-#endif /* CONTEXT_THREADS */
+XBT_INLINE int SIMIX_context_get_nthreads(void) {
+ return smx_parallel_contexts;
+}
- else if (!strcmp(name, "sysv"))
-#if !defined(_XBT_WIN32) && !defined(CONTEXT_THREADS)
- SIMIX_ctx_sysv_factory_init(factory);
-#else
- THROW0(not_found_error, 0,
- "Factory 'sysv' does not exist: no System V thread support under Windows");
-#endif
- else if (!strcmp(name, "lua"))
-#ifdef HAVE_LUA
- SIMIX_ctx_lua_factory_init(factory);
-#else
+/**
+ * \brief Returns whether some parallel threads are used
+ * for the user contexts.
+ * \return 1 if parallelism is used
+ */
+XBT_INLINE int SIMIX_context_is_parallel(void) {
+ return smx_parallel_contexts > 1;
+}
- THROW0(not_found_error, 0,
- "Factory 'lua' does not exist: Lua support was not compiled in the SimGrid library");
-#endif /* HAVE_LUA */
+/**
+ * \brief Sets the threshold above which user processes are run in parallel.
+ *
+ * If the number of threads is set to 1, there is no parallelism and this
+ * threshold has no effect.
+ *
+ * \param threshold when the number of user processes ready to run is above
+ * this threshold, they are run in parallel
+ */
+XBT_INLINE void SIMIX_context_set_parallel_threshold(int threshold) {
+ smx_parallel_threshold = threshold;
+}
- else if (!strcmp(name, "ruby"))
-#ifdef HAVE_RUBY
- SIMIX_ctx_ruby_factory_init(factory);
-#else
- THROW0(not_found_error, 0,
- "Factory 'ruby' does not exist: Ruby support was not compiled in the SimGrid library");
-#endif
- else
- THROW1(not_found_error, 0, "Factory '%s' does not exist", name);
+/**
+ * \brief Returns the threshold above which user processes are run in parallel.
+ *
+ * If the number of threads is set to 1, there is no parallelism and this
+ * threshold has no effect.
+ *
+ * \return when the number of user processes ready to run is above
+ * this threshold, they are run in parallel
+ */
+XBT_INLINE int SIMIX_context_get_parallel_threshold(void) {
+ return smx_parallel_threshold;
}
+
