int main(int argc,char* argv[])
{
int retry_times,inq_interval;
char* file_name;
int len;
int count;
count=0;
if(argc!=4){
printf("Usage: %s retry_times inquire_interval file_name\n",argv[0]);
return 1;
}
retry_times=atoi(argv[1]);
if(retry_times<=0){
printf("illegal retry times!\n");
return 1;
}
inq_interval=atoi(argv[2]);
if(inq_interval<=0){
printf("illegal inquiring interval\n");
return 1;
}
len=strlen(argv[3]);
if(len==0){
printf("illegal file name\n");
return 1;
}
if(get_access_right(inq_interval,retry_times,argv[3])==1){
while(count<5){
printf("pid: %ld process is occupying the resource, circle %d \n",(long)getpid(),count);
count++;
sleep(inq_interval);
}
release_right(file_name);
return 0;
}else
printf("pid: %ld process cannot access the resource...retry %d times\n",(long)getpid(),retry_times);
return 0;
}
/*
* argv[1] -> train number
* argv[2] -> train direction
*/
int main(int agc, char* argv[], char* env[]){
train_number = atoi(argv[1]);
process_pid = msgget(ftok("/tmp",100), IPC_CREAT | 0666);
main_semaphore = semget(ftok("/tmp",200), 6 ,IPC_CREAT | 0666);
if(main_semaphore ==-1 || process_pid == -1){
semctl(main_semaphore,0, IPC_RMID, NULL);
msgctl(process_pid, IPC_RMID, NULL);
perror("\nError in creating the message queues\n");
printf("\nExiting...\n\n");
exit(0);
}
pid = getpid();
sprintf(message.mtext,"%d",pid);
message.mtype = 100;
if(msgsnd(process_pid,&message,strlen(message.mtext)+1,0) == -1){
perror("\nError in sending\n");
}
train_started(argv[2]);
grab_self(argv[2]);
grab_right(argv[2]);
printf("\nTrain<%d>: Requests Junction-Lock\n", pid);
grab(0);
printf("\nTrain<%d>: Acquires Junction-Lock; Passing Junction\n", pid);
sleep(2);
release(0);
printf("\nTrain<%d>: Releases Junction-Lock\n", pid);
release_self(argv[2]);
release_right(argv[2]);
sprintf(message.mtext,"Finished");
message.mtype = 200;
if(msgsnd(process_pid,&message,strlen(message.mtext)+1,0) == -1){
perror("\nError in sending\n");
}
exit(0);
}
