73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
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/*******************************************************************************
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* File: startApp.c
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* Purpose: ice cream teller, basic sequence
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* Course: bsy
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* Author: M. Thaler, 2011
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* Revision: 5/2012, 7/2013
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* Version: v.fs20
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*******************************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <semaphore.h>
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#include "commonDefs.h"
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//******************************************************************************
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int main(void) {
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int j;
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char string[8];
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sem_t *myTurn, *coin, *coffee, *ready;
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pid_t tellerPID;
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sem_unlink(MYTURN_SEMAPHOR); // delete seamphor if it still exists
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sem_unlink(COIN_SEMAPHOR); // delete seamphor if it still exists
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sem_unlink(COFFEE_SEMAPHOR); // delete seamphor if it still exists
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sem_unlink(READY_SEMAPHOR); // delete seamphor if it still exists
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// set up a semaphore (? -> initial value of semaphor)
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// checkSem() -> macro defined in commonDefs.h
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/*
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myTurn = sem_open(MYTURN_SEMAPHOR, O_CREAT, 0700, ?); checkSem(myTurn);
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coin = sem_open(COIN_SEMAPHOR, O_CREAT, 0700, ?); checkSem(coin);
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coffee = sem_open(COFFEE_SEMAPHOR, O_CREAT, 0700, ?); checkSem(coffee);
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ready = sem_open(READY_SEMAPHOR, O_CREAT, 0700, ?); checkSem(ready);
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*/
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// now that the resources are set up, the supervisor can be started
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for (j = 1; j <= CUSTOMERS; j++) {
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if (fork() == 0) {
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sprintf(string, "%d", j);
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execl("./customer.e", "customer.e", string, NULL);
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printf("*** could not start customer.e ***\n");
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}
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}
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if ((tellerPID = fork()) == 0) {
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execl("./coffeeTeller.e", "coffeeTeller.e", "0", NULL);
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printf("*** could not start coffeTeller ***\n");
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}
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waitpid(tellerPID, NULL, 0);
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system("killall coffeeTeller.e");
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system("killall customer.e"); // kill all customers
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// clean up resources
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sem_unlink(MYTURN_SEMAPHOR);
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sem_unlink(COIN_SEMAPHOR);
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sem_unlink(COFFEE_SEMAPHOR);
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sem_unlink(READY_SEMAPHOR);
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printf("\n");
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}
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//******************************************************************************
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