1 /* Copyright (c) 2013-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 /***************** Centralized Mutual Exclusion Algorithm *********************/
8 /* This example implements a centralized mutual exclusion algorithm. */
9 /* Bug : CS requests of process 1 not satisfied */
10 /* LTL property checked : G(r->F(cs)); (r=request of CS, cs=CS ok) */
11 /******************************************************************************/
14 /usr/bin/time -f "clock:%e user:%U sys:%S swapped:%W exitval:%x max:%Mk" "$@" ../../../smpi_script/bin/smpirun -hostfile hostfile_bugged1_liveness -platform ../../platforms/cluster.xml --cfg=contexts/factory:ucontext --cfg=model-check/reduction:none --cfg=model-check/property:promela_bugged1_liveness --cfg=smpi/send-is-detached-thresh:0 --cfg=contexts/stack_size:128 --cfg=model-check/visited:100000 --cfg=model-check/max_depth:100000 ./bugged1_liveness */
18 #include <simgrid/modelchecker.h>
26 int main(int argc, char **argv){
31 xbt_dynar_t requests = xbt_dynar_new(sizeof(int), NULL);
34 err = MPI_Init(&argc, &argv);
35 if(err != MPI_SUCCESS){
36 printf("MPI initialization failed !\n");
40 MC_automaton_new_propositional_symbol_pointer("r", &r);
41 MC_automaton_new_propositional_symbol_pointer("cs", &cs);
43 MC_ignore(&(status.count), sizeof(status.count));
45 /* Get number of processes */
46 MPI_Comm_size(MPI_COMM_WORLD, &size);
47 /* Get id of this process */
48 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
50 if(rank == 0){ /* Coordinator */
52 MPI_Recv(&recv_buff, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
53 if(status.MPI_TAG == REQUEST_TAG){
55 printf("CS already used.\n");
56 xbt_dynar_push(requests, &recv_buff);
58 if(recv_buff != size - 1){
59 printf("CS idle. Grant immediatly.\n");
60 MPI_Send(&rank, 1, MPI_INT, recv_buff, GRANT_TAG, MPI_COMM_WORLD);
65 if(!xbt_dynar_is_empty(requests)){
66 printf("CS release. Grant to queued requests (queue size: %lu)", xbt_dynar_length(requests));
67 xbt_dynar_shift(requests, &recv_buff);
68 if(recv_buff != size - 1){
69 MPI_Send(&rank, 1, MPI_INT, recv_buff, GRANT_TAG, MPI_COMM_WORLD);
72 xbt_dynar_push(requests, &recv_buff);
76 printf("CS release. Resource now idle.\n");
83 printf("%d asks the request.\n", rank);
84 MPI_Send(&rank, 1, MPI_INT, 0, REQUEST_TAG, MPI_COMM_WORLD);
89 MPI_Recv(&recv_buff, 1, MPI_INT, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
90 if(status.MPI_TAG == GRANT_TAG && rank == size - 1){
94 printf("%d got the answer. Release it.\n", rank);
95 MPI_Send(&rank, 1, MPI_INT, 0, RELEASE_TAG, MPI_COMM_WORLD);