1 /* Copyright (c) 2013-2021. 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" "$@" \
15 ../../../smpi_script/bin/smpirun -hostfile hostfile_bugged1_liveness -platform ../../platforms/cluster_backbone.xml \
16 --cfg=contexts/factory:ucontext --cfg=model-check/reduction:none \
17 --cfg=model-check/property:promela_bugged1_liveness --cfg=smpi/send-is-detached-thresh:0 \
18 --cfg=contexts/stack-size:128 --cfg=model-check/visited:100000 --cfg=model-check/max-depth:100000 ./bugged1_liveness
23 #include <simgrid/modelchecker.h>
24 #include <xbt/dynar.h>
33 int main(int argc, char **argv){
38 xbt_dynar_t requests = xbt_dynar_new(sizeof(int), NULL);
41 int err = MPI_Init(&argc, &argv);
42 if(err != MPI_SUCCESS){
43 printf("MPI initialization failed !\n");
47 MC_automaton_new_propositional_symbol_pointer("r", &r);
48 MC_automaton_new_propositional_symbol_pointer("cs", &cs);
50 MC_ignore(&(status.count), sizeof(status.count));
52 /* Get number of processes */
53 MPI_Comm_size(MPI_COMM_WORLD, &size);
54 /* Get id of this process */
55 MPI_Comm_rank(MPI_COMM_WORLD, &rank);
57 if(rank == 0){ /* Coordinator */
60 MPI_Recv(&recv_buff, 1, MPI_INT, MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
61 if(status.MPI_TAG == REQUEST_TAG){
63 printf("CS already used.\n");
64 xbt_dynar_push(requests, &recv_buff);
66 if(recv_buff != size - 1){
67 printf("CS idle. Grant immediately.\n");
68 MPI_Send(&rank, 1, MPI_INT, recv_buff, GRANT_TAG, MPI_COMM_WORLD);
73 if(!xbt_dynar_is_empty(requests)){
74 printf("CS release. Grant to queued requests (queue size: %lu)", xbt_dynar_length(requests));
75 xbt_dynar_shift(requests, &recv_buff);
76 if(recv_buff != size - 1){
77 MPI_Send(&rank, 1, MPI_INT, recv_buff, GRANT_TAG, MPI_COMM_WORLD);
80 xbt_dynar_push(requests, &recv_buff);
84 printf("CS release. Resource now idle.\n");
91 printf("%d asks the request.\n", rank);
92 MPI_Send(&rank, 1, MPI_INT, 0, REQUEST_TAG, MPI_COMM_WORLD);
97 MPI_Recv(&recv_buff, 1, MPI_INT, 0, MPI_ANY_TAG, MPI_COMM_WORLD, &status);
98 if(status.MPI_TAG == GRANT_TAG && rank == size - 1){
102 printf("%d got the answer. Release it.\n", rank);
103 MPI_Send(&rank, 1, MPI_INT, 0, RELEASE_TAG, MPI_COMM_WORLD);
104 if(rank == size - 1){