+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
#include "../surf/surf_private.h"
#include "../simix/private.h"
#include "xbt/fifo.h"
#include "private.h"
+
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_global, mc,
- "Logging specific to MC (global)");
+ "Logging specific to MC (global)");
/* MC global data structures */
mc_snapshot_t initial_snapshot = NULL;
/**
* \brief Initialize the model-checker data structures
*/
-void MC_init(int method)
-{
+void MC_init(void)
+{
+ smx_process_t process;
+
/* Check if MC is already initialized */
- if(initial_snapshot)
+ if (initial_snapshot)
return;
-
+
/* Initialize the data structures that must be persistent across every
iteration of the model-checker (in RAW memory) */
MC_SET_RAW_MEM;
-
+
/* Initialize statistics */
mc_stats = xbt_new0(s_mc_stats_t, 1);
mc_stats->state_size = 1;
-
+
/* Create exploration stack */
mc_stack = xbt_fifo_new();
/* Create the container for the sets */
mc_setset = xbt_setset_new(20);
-
- switch(method){
- case 0:
- MC_dfs_init();
- break;
- case 1:
- MC_dpor_init();
- break;
- default:
- break;
+
+ /* Add the existing processes to mc's setset so they have an ID designated */
+ xbt_swag_foreach(process, simix_global->process_list){
+ xbt_setset_elm_add(mc_setset, process);
}
+ /* Initialize the control variable */
+ mc_exp_ctl = xbt_new0(e_mc_exp_ctl_t, 1);
+ *mc_exp_ctl = MC_EXPLORE;
+
+ MC_UNSET_RAW_MEM;
+
+
+
/* Save the initial state */
- MC_SET_RAW_MEM;
- initial_snapshot = xbt_new(s_mc_snapshot_t,1);
+/* MC_SET_RAW_MEM;
+ initial_snapshot = xbt_new0(s_mc_snapshot_t, 1);
MC_take_snapshot(initial_snapshot);
- MC_UNSET_RAW_MEM;
+ MC_UNSET_RAW_MEM;*/
}
-void MC_modelcheck(int method){
-
- MC_init(method);
+void MC_modelcheck(void)
+{
+ int status;
+ pid_t pid;
- switch(method){
- case 0:
- MC_dfs();
+ /* Compute initial state */
+ MC_init();
+
+ /* Fork an mc's slave exploration process and wait for it. */
+ /* The forked process will explore a trace until:
+ - a back-tracking point is found (it sets mc_expl_ctl to MC_explore)
+ - there are no more states to explore (it sets mc_expl_ctl to MC_STOP)
+ - a property is invalid (or dead-lock)
+ */
+ while(*mc_exp_ctl == MC_EXPLORE){
+ if((pid = fork())){
+ waitpid(pid, &status, 0);
+ mmalloc_detach(raw_heap);
+ raw_heap = mmalloc_attach(raw_heap_fd, (char*)(std_heap) + STD_HEAP_SIZE + getpagesize());
+
+ if (WIFSIGNALED(status)) {
+ INFO1("killed by signal %d\n", WTERMSIG(status));
break;
- case 1:
- MC_dpor();
+ }else if (WIFSTOPPED(status)) {
+ INFO1("stopped by signal %d\n", WSTOPSIG(status));
break;
- default:
+ }else if (WIFCONTINUED(status)) {
+ INFO0("continued\n");
break;
- }
+ }
+
+ if(*mc_exp_ctl == MC_DEADLOCK){
+ INFO0("**************************");
+ INFO0("*** DEAD-LOCK DETECTED ***");
+ INFO0("**************************");
+ MC_dump_stack(mc_stack);
+ MC_print_statistics(mc_stats);
+ break;
+ }
+
+ }else{
+ /* if mc_stack is empty then create first state, otherwise replay */
+ if(xbt_fifo_size(mc_stack) == 0)
+ MC_dpor_init();
+ else
+ MC_replay(mc_stack);
+
+ MC_dpor();
+ MC_memory_exit();
+ break;
+ }
+ }
+
+ /* If we are the mc's master process then exit */
+ if(pid)
+ MC_exit();
}
-int MC_random(int min, int max)
+void MC_exit(void)
{
- MC_random_create(min,max);
- SIMIX_process_yield();
+ mmalloc_detach(raw_heap);
+ shm_unlink("raw_heap");
+}
- if(!mc_replay_mode)
- return mc_current_state->executed_transition->current_value;
- else
- return mc_current_state->executed_transition->current_value - 1;
+int MC_random(int min, int max)
+{
+ /*FIXME: return mc_current_state->executed_transition->random.value;*/
+ return 0;
}
/**
*/
void MC_replay(xbt_fifo_t stack)
{
+ char *req_str;
+ smx_req_t req = NULL, saved_req = NULL;
xbt_fifo_item_t item;
- mc_transition_t trans;
+ mc_state_t state;
DEBUG0("**** Begin Replay ****");
/* Restore the initial state */
- MC_restore_snapshot(initial_snapshot);
+ /*MC_restore_snapshot(initial_snapshot);*/
- mc_replay_mode = TRUE;
-
- MC_UNSET_RAW_MEM;
+ MC_wait_for_requests();
/* Traverse the stack from the initial state and re-execute the transitions */
- for(item = xbt_fifo_get_last_item(stack);
- item != xbt_fifo_get_first_item(stack);
- item = xbt_fifo_get_prev_item(item)){
-
- mc_current_state = (mc_state_t) xbt_fifo_get_item_content(item);
- trans = mc_current_state->executed_transition;
+ for (item = xbt_fifo_get_last_item(stack);
+ item != xbt_fifo_get_first_item(stack);
+ item = xbt_fifo_get_prev_item(item)) {
+ state = (mc_state_t) xbt_fifo_get_item_content(item);
+ saved_req = MC_state_get_executed_request(state);
+
+ if(saved_req){
+ /* because we got a copy of the executed request, we have to fetch the
+ real one, pointed by the request field of the issuer process */
+ req = &saved_req->issuer->request;
+
+ /* Debug information */
+ if(XBT_LOG_ISENABLED(mc_global, xbt_log_priority_debug)){
+ req_str = MC_request_to_string(req);
+ DEBUG1("Replay: %s", req_str);
+ xbt_free(req_str);
+ }
+ }
+
+ SIMIX_request_pre(req);
+ MC_wait_for_requests();
+
/* Update statistics */
mc_stats->visited_states++;
mc_stats->executed_transitions++;
-
- DEBUG1("Executing transition %s", trans->name);
- SIMIX_process_schedule(trans->process);
-
- /* Do all surf's related black magic tricks to keep all working */
- MC_execute_surf_actions();
-
- /* Schedule every process that got enabled due to the executed transition */
- MC_schedule_enabled_processes();
}
- mc_replay_mode = FALSE;
DEBUG0("**** End Replay ****");
}
void MC_dump_stack(xbt_fifo_t stack)
{
mc_state_t state;
- mc_transition_t trans;
+
+ MC_show_stack(stack);
MC_SET_RAW_MEM;
- while( (state = (mc_state_t)xbt_fifo_pop(stack)) != NULL ){
- trans = state->executed_transition;
- if(trans)
- INFO1("%s", trans->name);
-
+ while ((state = (mc_state_t) xbt_fifo_pop(stack)) != NULL)
MC_state_delete(state);
- }
MC_UNSET_RAW_MEM;
}
void MC_show_stack(xbt_fifo_t stack)
{
mc_state_t state;
- mc_transition_t trans;
xbt_fifo_item_t item;
-
- INFO0("===========================");
- for(item=xbt_fifo_get_last_item(stack);
- (item?(state=(mc_state_t)(xbt_fifo_get_item_content(item))):(NULL)); \
- item=xbt_fifo_get_prev_item(item)){
- trans = state->executed_transition;
- if(trans){
- INFO1("%s", trans->name);
+ smx_req_t req;
+ char *req_str = NULL;
+
+ for (item = xbt_fifo_get_last_item(stack);
+ (item ? (state = (mc_state_t) (xbt_fifo_get_item_content(item)))
+ : (NULL)); item = xbt_fifo_get_prev_item(item)) {
+ req = MC_state_get_executed_request(state);
+ if(req){
+ req_str = MC_request_to_string(req);
+ INFO1("%s", req_str);
+ xbt_free(req_str);
}
}
}
-
/**
* \brief Schedules all the process that are ready to run
- * As a side effect it performs some clean-up required by SIMIX
*/
-void MC_schedule_enabled_processes(void)
+void MC_wait_for_requests(void)
{
- smx_process_t process;
-
- //SIMIX_process_empty_trash();
-
- /* Schedule every process that is ready to run due to an finished action */
- while ((process = xbt_swag_extract(simix_global->process_to_run))) {
- DEBUG2("Scheduling %s on %s", process->name, process->smx_host->name);
- SIMIX_process_schedule(process);
- }
-}
-
-/******************************** States **************************************/
-
-/**
- * \brief Creates a state data structure used by the exploration algorithm
- */
-mc_state_t MC_state_new(void)
-{
- mc_state_t state = NULL;
-
- state = xbt_new0(s_mc_state_t, 1);
- state->transitions = xbt_setset_new_set(mc_setset);
- state->enabled_transitions = xbt_setset_new_set(mc_setset);
- state->interleave = xbt_setset_new_set(mc_setset);
- state->done = xbt_setset_new_set(mc_setset);
- state->executed_transition = NULL;
-
- mc_stats->expanded_states++;
-
- return state;
-}
-/**
- * \brief Deletes a state data structure
- * \param trans The state to be deleted
- */
-void MC_state_delete(mc_state_t state)
-{
- /*if(state->executed_transition)
- MC_transition_delete(state->executed_transition);*/
- xbt_setset_destroy_set(state->transitions);
- xbt_setset_destroy_set(state->enabled_transitions);
- xbt_setset_destroy_set(state->interleave);
- xbt_setset_destroy_set(state->done);
-
- xbt_free(state);
-}
-
-/************************** SURF Emulation ************************************/
-
-/* Dirty hack, we manipulate surf's clock to simplify the integration of the
- model-checker */
-extern double NOW;
-
-/**
- * \brief Executes all the actions at every model
- */
-void MC_execute_surf_actions(void)
-{
- unsigned int iter;
- surf_action_t action = NULL;
- surf_model_t model = NULL;
- smx_action_t smx_action = NULL;
-
- /* Execute all the actions in every model */
- xbt_dynar_foreach(model_list, iter, model){
- while ((action = xbt_swag_extract(model->states.running_action_set))){
- /* FIXME: timeouts are not calculated correctly */
- if(NOW >= action->max_duration){
- surf_action_state_set(action, SURF_ACTION_DONE);
- smx_action = action->data;
- DEBUG5("Resource [%s] (%d): Executing RUNNING action \"%s\" (%p) MaxDuration %lf",
- model->name, xbt_swag_size(model->states.running_action_set),
- smx_action->name, smx_action, action->max_duration);
-
- /* Copy the transfered data of the completed network actions */
- /* FIXME: be carefull it might not be an action of the network model */
- if(smx_action && smx_action->data != NULL)
- SIMIX_network_copy_data((smx_comm_t)smx_action->data);
-
- if(smx_action)
- SIMIX_action_signal_all(smx_action);
+ char *req_str = NULL;
+ smx_req_t req = NULL;
+
+ do {
+ SIMIX_context_runall(simix_global->process_to_run);
+ while((req = SIMIX_request_pop())){
+ if(!SIMIX_request_is_visible(req))
+ SIMIX_request_pre(req);
+ else if(req->call == REQ_COMM_WAITANY)
+ THROW_UNIMPLEMENTED;
+ else if(XBT_LOG_ISENABLED(mc_global, xbt_log_priority_debug)){
+ req_str = MC_request_to_string(req);
+ DEBUG1("Got: %s", req_str);
+ xbt_free(req_str);
}
}
- /*FIXME: check if this is always empty or not */
- while ((action = xbt_swag_extract(model->states.failed_action_set))) {
- smx_action = action->data;
- DEBUG4("Resource [%s] (%d): Executing FAILED action \"%s\" (%p)",
- model->name, xbt_swag_size(model->states.running_action_set),
- smx_action->name, smx_action);
- if (smx_action)
- SIMIX_action_signal_all(smx_action);
- }
- }
- /* That's it, now go one step deeper into the model-checking process! */
- NOW += 0.5; /* FIXME: Check time increases*/
+ } while (xbt_swag_size(simix_global->process_to_run));
}
/****************************** Statistics ************************************/
INFO1("Visited states = %lu", stats->visited_states);
INFO1("Executed transitions = %lu", stats->executed_transitions);
INFO1("Expanded / Visited = %lf",
- (double)stats->visited_states / stats->expanded_states);
+ (double) stats->visited_states / stats->expanded_states);
/*INFO1("Exploration coverage = %lf",
- (double)stats->expanded_states / stats->state_size);*/
+ (double)stats->expanded_states / stats->state_size); */
}
/************************* Assertion Checking *********************************/
void MC_assert(int prop)
{
- if(!prop){
+ if (MC_IS_ENABLED && !prop) {
INFO0("**************************");
INFO0("*** PROPERTY NOT VALID ***");
INFO0("**************************");
}
}
+void MC_show_deadlock(smx_req_t req)
+{
+ char *req_str = NULL;
+ INFO0("**************************");
+ INFO0("*** DEAD-LOCK DETECTED ***");
+ INFO0("**************************");
+ INFO0("Locked request:");
+ req_str = MC_request_to_string(req);
+ INFO1("%s", req_str);
+ xbt_free(req_str);
+ INFO0("Counter-example execution trace:");
+ MC_dump_stack(mc_stack);
+}
