bart | 8bba1f7 | 2008-02-27 16:13:05 +0000 | [diff] [blame] | 1 | /** Initialize several kinds of mutexes and lock each mutex twice. |
| 2 | * Note: locking a regular mutex twice causes a deadlock. |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 3 | */ |
| 4 | |
| 5 | #define _GNU_SOURCE |
| 6 | |
| 7 | #include <stdio.h> |
bart | 4240ff3 | 2008-02-27 17:41:22 +0000 | [diff] [blame] | 8 | #include <unistd.h> |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 9 | #include <pthread.h> |
bart | 8556957 | 2008-05-03 09:15:25 +0000 | [diff] [blame] | 10 | #include "../../config.h" |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 11 | |
bart | 4240ff3 | 2008-02-27 17:41:22 +0000 | [diff] [blame] | 12 | |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 13 | static void lock_twice(pthread_mutex_t* const p) |
| 14 | { |
bart | 5f09dcf | 2009-07-10 09:26:29 +0000 | [diff] [blame^] | 15 | if (pthread_mutex_trylock(p) != 0) |
| 16 | fprintf(stderr, "first lock call failed !\n"); |
| 17 | if (pthread_mutex_trylock(p) != 0) |
| 18 | fprintf(stderr, "second lock call failed !\n"); |
| 19 | if (pthread_mutex_unlock(p) != 0) |
| 20 | fprintf(stderr, "first unlock call failed !\n"); |
| 21 | if (pthread_mutex_unlock(p) != 0) |
| 22 | fprintf(stderr, "second unlock call failed !\n"); |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 23 | } |
| 24 | |
| 25 | int main(int argc, char** argv) |
| 26 | { |
bart | 8556957 | 2008-05-03 09:15:25 +0000 | [diff] [blame] | 27 | #if defined(HAVE_PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP) |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 28 | { |
| 29 | pthread_mutex_t m = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; |
| 30 | |
bart | 5f09dcf | 2009-07-10 09:26:29 +0000 | [diff] [blame^] | 31 | fprintf(stderr, "Recursive mutex (statically initialized).\n"); |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 32 | lock_twice(&m); |
bart | 68d80f4 | 2008-03-08 15:03:30 +0000 | [diff] [blame] | 33 | pthread_mutex_destroy(&m); |
bart | 8556957 | 2008-05-03 09:15:25 +0000 | [diff] [blame] | 34 | } |
| 35 | #endif |
| 36 | #if defined(HAVE_PTHREAD_MUTEX_RECURSIVE_NP) |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 37 | { |
| 38 | pthread_mutex_t m; |
| 39 | pthread_mutexattr_t attr; |
| 40 | |
bart | 5f09dcf | 2009-07-10 09:26:29 +0000 | [diff] [blame^] | 41 | fprintf(stderr, "\nRecursive mutex (initialized via mutex attributes).\n"); |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 42 | pthread_mutexattr_init(&attr); |
| 43 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP); |
| 44 | pthread_mutex_init(&m, &attr); |
| 45 | pthread_mutexattr_destroy(&attr); |
| 46 | lock_twice(&m); |
| 47 | pthread_mutex_destroy(&m); |
bart | 8556957 | 2008-05-03 09:15:25 +0000 | [diff] [blame] | 48 | } |
| 49 | #endif |
| 50 | #if defined(HAVE_PTHREAD_MUTEX_ERRORCHECK_NP) |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 51 | { |
| 52 | pthread_mutex_t m; |
| 53 | pthread_mutexattr_t attr; |
| 54 | |
bart | 5f09dcf | 2009-07-10 09:26:29 +0000 | [diff] [blame^] | 55 | fprintf(stderr, "\nError checking mutex.\n"); |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 56 | pthread_mutexattr_init(&attr); |
| 57 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK_NP); |
| 58 | pthread_mutex_init(&m, &attr); |
| 59 | pthread_mutexattr_destroy(&attr); |
| 60 | lock_twice(&m); |
bart | 8556957 | 2008-05-03 09:15:25 +0000 | [diff] [blame] | 61 | pthread_mutex_destroy(&m); |
| 62 | } |
| 63 | #endif |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 64 | |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 65 | { |
| 66 | pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER; |
| 67 | |
bart | 5f09dcf | 2009-07-10 09:26:29 +0000 | [diff] [blame^] | 68 | fprintf(stderr, "\nNon-recursive mutex.\n"); |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 69 | lock_twice(&m); |
bart | 8556957 | 2008-05-03 09:15:25 +0000 | [diff] [blame] | 70 | } |
bart | 5f09dcf | 2009-07-10 09:26:29 +0000 | [diff] [blame^] | 71 | |
| 72 | fprintf(stderr, "\nDone.\n"); |
| 73 | |
bart | 5357fcb | 2008-02-27 15:46:00 +0000 | [diff] [blame] | 74 | return 0; |
| 75 | } |