sewardj | 7313524 | 2011-06-24 16:03:32 +0000 | [diff] [blame] | 1 | |
| 2 | #include <pthread.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <assert.h> |
| 6 | #include <unistd.h> |
| 7 | |
| 8 | /* Test of the mechanism for showing all locks held by a thread. Test |
| 9 | the case where the earlier thread held, at the time of the access, |
| 10 | some locks, at least one of which is deleted by the time the second |
| 11 | access (the race) happens. This causes problems for Helgrind's |
| 12 | error reporting mechanism in that it can no longer show the deleted |
| 13 | lock in the error message.x */ |
| 14 | |
| 15 | pthread_mutex_t mx1a; |
| 16 | pthread_mutex_t mx1b; |
| 17 | pthread_mutex_t mx2a; |
| 18 | pthread_mutex_t mx2b; |
| 19 | |
| 20 | int x = 0; |
| 21 | |
| 22 | void* child_fn1 ( void* arg ) |
| 23 | { |
| 24 | int r; |
| 25 | // We are the first-accessing thread. Take and release two locks |
| 26 | // and then destroy one of them. |
| 27 | r= pthread_mutex_lock(&mx1a); assert(!r); |
| 28 | r= pthread_mutex_lock(&mx1b); assert(!r); |
| 29 | x = 1; |
| 30 | r= pthread_mutex_unlock(&mx1b); assert(!r); |
| 31 | r= pthread_mutex_unlock(&mx1a); assert(!r); |
| 32 | r= pthread_mutex_destroy(&mx1a); assert(!r); |
| 33 | sleep(1); |
| 34 | return NULL; |
| 35 | } |
| 36 | |
| 37 | void* child_fn2 ( void* arg ) |
| 38 | { |
| 39 | int r; |
| 40 | // We are the second-accessing thread. Take and release |
| 41 | // our two locks, but don't otherwise mess with them. |
| 42 | sleep(1); |
| 43 | r= pthread_mutex_lock(&mx2a); assert(!r); |
| 44 | r= pthread_mutex_lock(&mx2b); assert(!r); |
| 45 | x = 1; |
| 46 | r= pthread_mutex_unlock(&mx2b); assert(!r); |
| 47 | r= pthread_mutex_unlock(&mx2a); assert(!r); |
| 48 | return NULL; |
| 49 | } |
| 50 | |
| 51 | int main ( int argc, char** argv ) |
| 52 | { |
| 53 | pthread_t child1, child2; |
| 54 | int r; |
| 55 | |
| 56 | r= pthread_mutex_init(&mx1a, NULL); assert(!r); |
| 57 | r= pthread_mutex_init(&mx1b, NULL); assert(!r); |
| 58 | r= pthread_mutex_init(&mx2a, NULL); assert(!r); |
| 59 | r= pthread_mutex_init(&mx2b, NULL); assert(!r); |
| 60 | |
| 61 | r= pthread_create(&child2, NULL, child_fn2, NULL); assert(!r); |
| 62 | r= pthread_create(&child1, NULL, child_fn1, NULL); assert(!r); |
| 63 | |
| 64 | r= pthread_join(child1, NULL); assert(!r); |
| 65 | r= pthread_join(child2, NULL); assert(!r); |
| 66 | |
| 67 | // don't destroy mx1a; it's already destroyed. |
| 68 | r= pthread_mutex_destroy(&mx1b); assert(!r); |
| 69 | r= pthread_mutex_destroy(&mx2a); assert(!r); |
| 70 | r= pthread_mutex_destroy(&mx2b); assert(!r); |
| 71 | |
| 72 | return 0; |
| 73 | } |