source: liacs/os/assignment4/assignment4c.c@ 202

Last change on this file since 202 was 2, checked in by Rick van der Zwet, 15 years ago

Initial import of data of old repository ('data') worth keeping (e.g. tracking
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[2]1
2
3#include <sysexits.h>
4#include <stdlib.h>
5#include <pthread.h>
6#include <stdio.h>
7#include <unistd.h>
8
9
10static int x = 0;
11static int y = 0;
12
13static int flagA = 0;
14static int flagB = 0;
15static int turn = 0;
16
17
18//Consumer
19void *procA() {
20 for ( ;; ) {
21 //hungry, ask cheff to prepare something
22 flagA = 1;
23 turn = 1;
24 while ( flagB && turn == 1 ) { usleep(1); }
25 //eat
26 printf("Turn A\n");
27 y = 0;
28 flagA = 0;
29
30
31
32 }
33 pthread_exit(NULL);
34}
35
36//Producer
37void *procB() {
38 for ( ;; ) {
39 //prepare food, and allow eating
40 flagB = 1;
41 turn = 0;
42 while ( flagA && turn == 0 ) { usleep(1); }
43 printf("Turn B\n");
44 y = 1;
45 flagB = 0;
46 }
47 pthread_exit(NULL);
48}
49
50
51int main (int argc, char * argv[]) {
52
53 //create 2 threads
54 pthread_t thread0, thread1;
55 pthread_create(&thread0, NULL, procA, NULL);
56 pthread_create(&thread1, NULL, procB, NULL);
57
58 //debugging
59 for ( ;; ) {
60 printf("flagA:%i flagB:%i turn:%i, y:%i\n", flagA, flagB, turn, y);
61 sleep(1);
62 }
63 pthread_exit(NULL);
64 return(EX_OK);
65}
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