sewardj | b411202 | 2007-11-09 22:49:28 +0000 | [diff] [blame^] | 1 | |
| 2 | #include <pthread.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | |
| 6 | /* Simple test program, has two races. A happens-before detector can only |
| 7 | ever detect one of them, though. */ |
| 8 | |
| 9 | int unprot1 = 0, unprot2 = 0, prot = 0; |
| 10 | pthread_mutex_t mu = PTHREAD_MUTEX_INITIALIZER; |
| 11 | |
| 12 | void* child_fn ( void* arg ) |
| 13 | { |
| 14 | unprot1 ++; |
| 15 | pthread_mutex_lock( &mu ); |
| 16 | prot ++; |
| 17 | pthread_mutex_unlock( &mu ); |
| 18 | unprot2 ++; |
| 19 | return NULL; |
| 20 | } |
| 21 | |
| 22 | int main ( void ) |
| 23 | { |
| 24 | pthread_t child; |
| 25 | |
| 26 | if (pthread_create(&child, NULL, child_fn, NULL)) { |
| 27 | perror("pthread_create"); |
| 28 | exit(1); |
| 29 | } |
| 30 | |
| 31 | unprot1 ++; |
| 32 | pthread_mutex_lock( &mu ); |
| 33 | prot ++; |
| 34 | pthread_mutex_unlock( &mu ); |
| 35 | unprot2 ++; |
| 36 | |
| 37 | if (pthread_join(child, NULL)) { |
| 38 | perror("pthread join"); |
| 39 | exit(1); |
| 40 | } |
| 41 | |
| 42 | return 0; |
| 43 | } |