I have found that dmtcp (as of the 1.2.4 release, unable to build 1.2.5 due to
the old OS I am on not having eventfd and signalfd) does not support
semaphores, as it in does not re-create them if they've been removed. If it is
in 1.2.5 please let me know and I'll work on how we can move up.
Example code:
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <stdio.h>
int main()
{
int i, sid = 0;
struct sembuf sops;
sid = semget((key_t)333, 1, IPC_CREAT | 0666);
if (sid < 0) {
printf("Semaphore creation failure");
return 1;
}
for (i = 0; i < 3; i++) {
printf("Sleeping for 3 seconds. Do dmtcp_coordinator c\n");
sleep(3);
}
printf("Accessing semaphore... ");
sops.sem_num = 0;
sops.sem_op = 0;
sops.sem_flg = SEM_UNDO;
if (semop(sid, &sops, 1) == -1) {
printf("Failure\n");
} else {
printf("Success\n");
}
return 0;
}
// Create save point
dmtcp_checkpoint a.out
// Another window, when it gets to dmtcp_coordinator:
dmtcp_coordinator c
// This should pass
./dmtcp_restart.sh
ipcs (identify the semaphore)
ipcrm -s <semaphore id>
// This will fail
./dmtcp_restart.sh
Joshua Louie
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