| 51 | } |
| 52 | |
| 53 | void |
| 54 | reader(int fd) |
| 55 | { |
| 56 | int *sharedMemory; |
| 57 | ATOMIC_SHARED int val; |
| 58 | int i; |
| 59 | |
| 60 | sharedMemory = mmap(0, sizeof(int), PROT_READ, MAP_SHARED, fd, 0); |
| 61 | if (sharedMemory == MAP_FAILED) { |
| 62 | perror("mmap"); |
| 63 | exit(1); |
| 64 | } |
| 65 | for (i = -1;;) { |
| 66 | val = *sharedMemory; |
| 67 | if (val > i) { |
| 68 | i = *sharedMemory; |
| 69 | printf("%d ", i); |
| 70 | fflush(stdout); |
| 71 | } |
| 72 | sleep(1); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | void |
| 77 | writer(int fd) |