+xbt_context_t
+xbt_context_new(const char *name,
+ xbt_main_func_t code,
+ void_f_pvoid_t startup_func,
+ void *startup_arg,
+ void_f_pvoid_t cleanup_func,
+ void *cleanup_arg, int argc, char *argv[]
+ )
+{
+ xbt_context_t res = NULL;
+
+ res = xbt_new0(s_xbt_context_t, 1);
+
+ res->code = code;
+ res->name = xbt_strdup(name);
+
+#ifdef CONTEXT_THREADS
+ res->mutex = xbt_os_mutex_init();
+ res->cond = xbt_os_cond_init();
+#else
+
+ xbt_assert2(getcontext(&(res->uc)) == 0,
+ "Error in context saving: %d (%s)", errno, strerror(errno));
+ res->uc.uc_link = NULL;
+ /* res->uc.uc_link = &(current_context->uc); */
+ /* WARNING : when this context is over, the current_context (i.e. the
+ father), is awaken... Theorically, the wrapper should prevent using
+ this feature. */
+ res->uc.uc_stack.ss_sp = pth_skaddr_makecontext(res->stack, STACK_SIZE);
+ res->uc.uc_stack.ss_size = pth_sksize_makecontext(res->stack, STACK_SIZE);
+
+ res->exception = xbt_new(ex_ctx_t, 1);
+ XBT_CTX_INITIALIZE(res->exception);
+#endif /* CONTEXT_THREADS or not */
+
+ res->iwannadie = 0; /* useless but makes valgrind happy */
+
+ res->argc = argc;
+ res->argv = argv;
+ res->startup_func = startup_func;
+ res->startup_arg = startup_arg;
+ res->cleanup_func = cleanup_func;
+ res->cleanup_arg = cleanup_arg;
+
+ xbt_swag_insert(res, context_living);
+
+ return res;
+}
+
+/* Scenario for the end of a context:
+ *
+ * CASE 1: death after end of function
+ * __context_wrapper, called by os thread, calls xbt_context_stop after user code stops
+ * xbt_context_stop calls user cleanup_func if any (in context settings),
+ * add current to trashbin
+ * yields back to maestro (destroy os thread on need)
+ * From time to time, maestro calls xbt_context_empty_trash,
+ * which maps xbt_context_free on the content
+ * xbt_context_free frees some more memory,
+ * joins os thread
+ *
+ * CASE 2: brutal death
+ * xbt_context_kill (from any context)
+ * set context->wannadie to 1
+ * yields to the context
+ * the context is awaken in the middle of __yield.
+ * At the end of it, it checks that wannadie == 1, and call xbt_context_stop
+ * (same than first case afterward)
+ */
+
+/* Argument must be stopped first -- runs in maestro context */
+static void xbt_context_free(xbt_context_t context)
+{
+ int i;
+
+ if (!context)
+ return;
+
+ DEBUG1("Freeing %p", context);
+ free(context->name);
+
+ DEBUG0("Freeing arguments");
+
+ for (i = 0; i < context->argc; i++)
+ if (context->argv[i])
+ free(context->argv[i]);
+
+ if (context->argv)
+ free(context->argv);
+
+#ifdef CONTEXT_THREADS
+ DEBUG1("\t joining %p", (void *) context->thread);
+
+ xbt_os_thread_join(context->thread, NULL);
+
+ xbt_os_mutex_destroy(context->mutex);
+ xbt_os_cond_destroy(context->cond);
+
+ context->thread = NULL;
+ context->mutex = NULL;
+ context->cond = NULL;
+#else
+ if (context->exception)
+ free(context->exception);
+#endif
+
+ free(context);
+}
+
+/************************/
+/* Start/stop a context */
+/************************/
+static void xbt_context_stop(int retvalue);
+static void __xbt_context_yield(xbt_context_t context);
+
+static void *__context_wrapper(void *c)
+{
+ xbt_context_t context = current_context;
+
+#ifdef CONTEXT_THREADS
+ context = (xbt_context_t) c;
+ context->thread = xbt_os_thread_self();
+
+ DEBUG3("**[ctx:%p;self:%p]** Lock creation_mutex %p ****", context,
+ (void *) xbt_os_thread_self(), creation_mutex);
+ xbt_os_mutex_lock(creation_mutex);
+ xbt_os_mutex_lock(context->mutex);
+
+ DEBUG4
+ ("**[ctx:%p;self:%p]** Releasing the creator (creation_cond %p,%p) ****",
+ context, (void *) xbt_os_thread_self(), creation_cond, creation_mutex);
+ xbt_os_cond_signal(creation_cond);
+ xbt_os_mutex_unlock(creation_mutex);
+
+ DEBUG4("**[ctx:%p;self:%p]** Going to Jail on lock %p and cond %p ****",
+ context, (void *) xbt_os_thread_self(), context->mutex,
+ context->cond);
+ xbt_os_cond_wait(context->cond, context->mutex);
+
+ DEBUG3("**[ctx:%p;self:%p]** Unlocking individual %p ****", context,
+ (void *) xbt_os_thread_self(), context->mutex);
+ xbt_os_mutex_unlock(context->mutex);
+
+#endif
+
+ if (context->startup_func)
+ context->startup_func(context->startup_arg);
+
+ DEBUG0("Calling the main function");
+
+ xbt_context_stop((context->code) (context->argc, context->argv));
+ return NULL;
+}
+
+/**
+ * \param context the context to start
+ *
+ * Calling this function prepares \a context to be run. It will
+ however run effectively only when calling #xbt_context_schedule
+ */
+void xbt_context_start(xbt_context_t context)
+{
+#ifdef CONTEXT_THREADS
+ /* Launch the thread */
+
+ DEBUG3("**[ctx:%p;self:%p]** Locking creation_mutex %p ****", context,
+ xbt_os_thread_self(), creation_mutex);
+ xbt_os_mutex_lock(creation_mutex);
+
+ DEBUG2("**[ctx:%p;self:%p]** Thread create ****", context,
+ xbt_os_thread_self());
+ context->thread =
+ xbt_os_thread_create(context->name, __context_wrapper, context);
+ DEBUG3("**[ctx:%p;self:%p]** Thread created : %p ****", context,
+ xbt_os_thread_self(), context->thread);
+
+ DEBUG4
+ ("**[ctx:%p;self:%p]** Going to jail on creation_cond/mutex (%p,%p) ****",
+ context, xbt_os_thread_self(), creation_cond, creation_mutex);
+ xbt_os_cond_wait(creation_cond, creation_mutex);
+ DEBUG3("**[ctx:%p;self:%p]** Unlocking creation %p ****", context,
+ xbt_os_thread_self(), creation_mutex);
+ xbt_os_mutex_unlock(creation_mutex);
+#else
+ makecontext(&(context->uc), (void (*)(void)) __context_wrapper, 1, context);
+#endif
+}
+
+/* Stops current context: calls user's cleanup function, kills os thread, and yields back to maestro */
+static void xbt_context_stop(int retvalue)
+{
+ DEBUG1("--------- %p is exiting ---------", current_context);
+
+ if (current_context->cleanup_func) {
+ DEBUG0("Calling cleanup function");
+ current_context->cleanup_func(current_context->cleanup_arg);
+ }
+
+ DEBUG0("Putting context in the to_destroy set");
+ xbt_swag_remove(current_context, context_living);
+ xbt_swag_insert(current_context, context_to_destroy);
+
+ DEBUG0("Yielding");
+
+#ifdef CONTEXT_THREADS
+ /* a java thread has called this function
+ * - update the current context
+ * - signal the condition of the main thread
+ * - wait on its condition
+ * - restore thr current contex
+ */
+
+ xbt_os_mutex_lock(master_mutex);
+ xbt_os_cond_signal(master_cond);
+ xbt_os_mutex_unlock(master_mutex);
+ xbt_os_thread_exit(NULL); /* We should provide return value in case other wants it */
+
+
+#else
+ __xbt_context_yield(current_context);
+#endif
+ THROW_IMPOSSIBLE;
+}
+
+
+
+/** Garbage collection
+ *
+ * Should be called some time to time to free the memory allocated for contexts
+ * that have finished executing their main functions.
+ */
+void xbt_context_empty_trash(void)