bart | 1d4070d | 2008-05-14 12:22:15 +0000 | [diff] [blame] | 1 | /** Hold several types of synchronization objects locked as long as specified. |
| 2 | */ |
| 3 | |
| 4 | #define _GNU_SOURCE 1 |
| 5 | |
| 6 | #include <assert.h> |
| 7 | #include <pthread.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <time.h> |
| 11 | #include <unistd.h> |
| 12 | |
| 13 | |
| 14 | static void delay_ms(const int ms) |
| 15 | { |
| 16 | struct timespec ts; |
| 17 | |
| 18 | assert(ms >= 0); |
| 19 | ts.tv_sec = ms / 1000; |
| 20 | ts.tv_nsec = (ms % 1000) * 1000 * 1000; |
| 21 | nanosleep(&ts, 0); |
| 22 | } |
| 23 | |
| 24 | int main(int argc, char** argv) |
| 25 | { |
| 26 | int interval = 0; |
| 27 | int optchar; |
| 28 | pthread_mutex_t mutex; |
| 29 | pthread_mutexattr_t mutexattr; |
| 30 | pthread_rwlock_t rwlock; |
| 31 | |
| 32 | while ((optchar = getopt(argc, argv, "i:")) != EOF) |
| 33 | { |
| 34 | switch (optchar) |
| 35 | { |
| 36 | case 'i': |
| 37 | interval = atoi(optarg); |
| 38 | break; |
| 39 | default: |
| 40 | fprintf(stderr, "Usage: %s [-i <interval time in ms>].\n", argv[0]); |
| 41 | break; |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | fprintf(stderr, "Locking mutex ...\n"); |
| 46 | |
| 47 | pthread_mutexattr_init(&mutexattr); |
| 48 | pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE); |
| 49 | pthread_mutex_init(&mutex, &mutexattr); |
| 50 | pthread_mutexattr_destroy(&mutexattr); |
| 51 | pthread_mutex_lock(&mutex); |
| 52 | delay_ms(interval); |
| 53 | pthread_mutex_lock(&mutex); |
| 54 | pthread_mutex_unlock(&mutex); |
| 55 | pthread_mutex_unlock(&mutex); |
| 56 | pthread_mutex_destroy(&mutex); |
| 57 | |
| 58 | fprintf(stderr, "Locking rwlock exclusively ...\n"); |
| 59 | |
| 60 | pthread_rwlock_init(&rwlock, 0); |
| 61 | pthread_rwlock_wrlock(&rwlock); |
| 62 | delay_ms(interval); |
| 63 | pthread_rwlock_unlock(&rwlock); |
| 64 | pthread_rwlock_destroy(&rwlock); |
| 65 | |
| 66 | fprintf(stderr, "Locking rwlock shared ...\n"); |
| 67 | |
| 68 | pthread_rwlock_init(&rwlock, 0); |
| 69 | pthread_rwlock_rdlock(&rwlock); |
| 70 | delay_ms(interval); |
| 71 | pthread_rwlock_rdlock(&rwlock); |
| 72 | pthread_rwlock_unlock(&rwlock); |
| 73 | pthread_rwlock_unlock(&rwlock); |
| 74 | pthread_rwlock_destroy(&rwlock); |
| 75 | |
| 76 | fprintf(stderr, "Done.\n"); |
| 77 | |
| 78 | return 0; |
| 79 | } |