X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/ae8140f19db6cb86f753e32499eab49190846d1f..d5b29830df70e823202e384a7655e4371193ecd7:/examples/msg/mc/bugged1_liveness.c diff --git a/examples/msg/mc/bugged1_liveness.c b/examples/msg/mc/bugged1_liveness.c index eaeceb4c2b..05da543dc7 100644 --- a/examples/msg/mc/bugged1_liveness.c +++ b/examples/msg/mc/bugged1_liveness.c @@ -1,147 +1,165 @@ -/***************** Centralized Mutual Exclusion Algorithm *********************/ -/* This example implements a centralized mutual exclusion algorithm. */ -/* CS requests of client 2 not satisfied */ -/* LTL property checked : G(r->F(cs)); (r=request of CS, cs=CS ok) */ -/******************************************************************************/ +/* Copyright (c) 2012-2017. The SimGrid Team. All rights reserved. */ -#include "msg/msg.h" +/* 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. */ + +/***************** Centralized Mutual Exclusion Algorithm *******************/ +/* This example implements a centralized mutual exclusion algorithm. */ +/* Bug : CS requests of client 1 not satisfied */ +/* LTL property checked : G(r->F(cs)); (r=request of CS, cs=CS ok) */ +/****************************************************************************/ + +#ifdef GARBAGE_STACK +#include +#include +#include +#endif + +#include "simgrid/msg.h" #include "mc/mc.h" -#include "xbt/automaton.h" -#include "xbt/automatonparse_promela.h" #include "bugged1_liveness.h" -#include "y.tab.c" - -#define AMOUNT_OF_CLIENTS 2 -#define CS_PER_PROCESS 1 XBT_LOG_NEW_DEFAULT_CATEGORY(bugged1_liveness, "my log messages"); - -int r=0; +int r=0; int cs=0; -int predR(){ - return r; -} - -int predCS(){ - return cs; +#ifdef GARBAGE_STACK +/** Do not use a clean stack */ +static void garbage_stack(void) { + const size_t size = 256; + int fd = open("/dev/urandom", O_RDONLY); + char foo[size]; + read(fd, foo, size); + close(fd); } +#endif - -int coordinator(int argc, char *argv[]) +static int coordinator(int argc, char *argv[]) { - xbt_dynar_t requests = xbt_dynar_new(sizeof(char *), NULL); // dynamic vector storing requests (which are char*) - int CS_used = 0; // initially the CS is idle - int todo = AMOUNT_OF_CLIENTS * CS_PER_PROCESS; // amount of releases we are expecting - while (todo > 0) { - m_task_t task = NULL; + int CS_used = 0; + msg_task_t task = NULL; + msg_task_t answer = NULL; + xbt_dynar_t requests = xbt_dynar_new(sizeof(char *), NULL); + char *req; + + while(1){ MSG_task_receive(&task, "coordinator"); - const char *kind = MSG_task_get_name(task); //is it a request or a release? - if (!strcmp(kind, "request")) { // that's a request - char *req = MSG_task_get_data(task); - if (CS_used) { // need to push the request in the vector - XBT_INFO("CS already used. Queue the request of client %d", atoi(req) +1); + const char *kind = MSG_task_get_name(task); + if (!strcmp(kind, "request")) { + req = MSG_task_get_data(task); + if (CS_used) { + XBT_INFO("CS already used. Queue the request."); xbt_dynar_push(requests, &req); - } else { // can serve it immediatly - if(strcmp(req, "1") == 0){ - m_task_t answer = MSG_task_create("grant", 0, 1000, NULL); - MSG_task_send(answer, req); - CS_used = 1; - XBT_INFO("CS idle. Grant immediatly"); - } + } else { + if(strcmp(req, "1") != 0){ + XBT_INFO("CS idle. Grant immediatly"); + answer = MSG_task_create("grant", 0, 1000, NULL); + MSG_task_send(answer, req); + CS_used = 1; + answer = NULL; + } } - } else { // that's a release. Check if someone was waiting for the lock - if (xbt_dynar_length(requests) > 0) { + } else { + if (!xbt_dynar_is_empty(requests)) { XBT_INFO("CS release. Grant to queued requests (queue size: %lu)", xbt_dynar_length(requests)); - char *req ; - xbt_dynar_get_cpy(requests, (xbt_dynar_length(requests) - 1), &req); - if(strcmp(req, "1") == 0){ - xbt_dynar_pop(requests, &req); - MSG_task_send(MSG_task_create("grant", 0, 1000, NULL), req); - todo--; - }else{ - xbt_dynar_pop(requests, &req); - MSG_task_send(MSG_task_create("notgrant", 0, 1000, NULL), req); - CS_used = 0; - todo--; - } - } else { // nobody wants it + xbt_dynar_shift(requests, &req); + if(strcmp(req, "1") != 0){ + MSG_task_send(MSG_task_create("grant", 0, 1000, NULL), req); + }else{ + xbt_dynar_push(requests, &req); + CS_used = 0; + } + }else{ XBT_INFO("CS release. resource now idle"); CS_used = 0; - todo--; } } MSG_task_destroy(task); + task = NULL; + kind = NULL; + req = NULL; } - XBT_INFO("Received all releases, quit now"); return 0; } -int client(int argc, char *argv[]) +static int client(int argc, char *argv[]) { int my_pid = MSG_process_get_PID(MSG_process_self()); - char *my_mailbox = bprintf("%s", argv[1]); - int i; + char *my_mailbox = xbt_strdup(argv[1]); + msg_task_t grant = NULL; + msg_task_t release = NULL; - // request the CS 4 times, sleeping a bit in between - for (i = 0; i < CS_PER_PROCESS; i++) { - + while(1){ XBT_INFO("Ask the request"); MSG_task_send(MSG_task_create("request", 0, 1000, my_mailbox), "coordinator"); - if(strcmp(my_mailbox, "2") == 0){ + if(strcmp(my_mailbox, "1") == 0){ r = 1; cs = 0; - XBT_DEBUG("Propositions changed : r=1, cs=0"); + XBT_INFO("Propositions changed : r=1, cs=0"); } - // wait the answer - m_task_t grant = NULL; MSG_task_receive(&grant, my_mailbox); const char *kind = MSG_task_get_name(grant); - if((strcmp(my_mailbox, "2") == 0) && (strcmp("grant", kind) == 0)){ + if((strcmp(my_mailbox, "1") == 0) && (strcmp("grant", kind) == 0)){ cs = 1; r = 0; - XBT_DEBUG("Propositions changed : r=0, cs=1"); + XBT_INFO("Propositions changed : r=0, cs=1"); } - MSG_task_destroy(grant); + grant = NULL; + kind = NULL; + XBT_INFO("%s got the answer. Sleep a bit and release it", argv[1]); + MSG_process_sleep(1); - MSG_task_send(MSG_task_create("release", 0, 1000, NULL), "coordinator"); + + release = MSG_task_create("release", 0, 1000, NULL); + MSG_task_send(release, "coordinator"); + + release = NULL; MSG_process_sleep(my_pid); - - if(strcmp(my_mailbox, "2") == 0){ + + if(strcmp(my_mailbox, "1") == 0){ cs=0; r=0; - XBT_DEBUG("Propositions changed : r=0, cs=0"); + XBT_INFO("Propositions changed : r=0, cs=0"); } - - } - XBT_INFO("Got all the CS I wanted (%s), quit now", my_mailbox); + } return 0; } +static int raw_client(int argc, char *argv[]) +{ +#ifdef GARBAGE_STACK + // At this point the stack of the callee (client) is probably filled with + // zeros and uninitialized variables will contain 0. This call will place + // random byes in the stack of the callee: + garbage_stack(); +#endif + return client(argc, argv); +} + int main(int argc, char *argv[]) { - init(); - yyparse(); - automaton = get_automaton(); - xbt_new_propositional_symbol(automaton,"r", &predR); - xbt_new_propositional_symbol(automaton,"cs", &predCS); - - MSG_global_init(&argc, argv); - MSG_create_environment("../msg_platform.xml"); + MSG_init(&argc, argv); + + MC_automaton_new_propositional_symbol_pointer("r", &r); + MC_automaton_new_propositional_symbol_pointer("cs", &cs); + + MSG_create_environment(argv[1]); + MSG_function_register("coordinator", coordinator); - MSG_function_register("client", client); - MSG_launch_application("deploy_bugged1_liveness.xml"); - MSG_main_liveness(automaton, argv[0]); + MSG_function_register("client", raw_client); + MSG_launch_application(argv[2]); + + MSG_main(); return 0; }