sewardj | 622fe49 | 2011-03-11 21:06:59 +0000 | [diff] [blame] | 1 | |
| 2 | #include <assert.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <pthread.h> |
| 6 | #include <unistd.h> |
| 7 | |
| 8 | static char* s_mem; |
| 9 | |
| 10 | /* wait a second, so as to guarantee that the parent access |
| 11 | the malloc'd area, then free it. */ |
| 12 | static void* thread_func(void* arg) |
| 13 | { |
| 14 | sleep(1); |
| 15 | free(s_mem); |
| 16 | return NULL; |
| 17 | } |
| 18 | |
| 19 | int main(int argc, char** argv) |
| 20 | { |
| 21 | pthread_t tid; |
| 22 | int quiet; |
| 23 | |
| 24 | fprintf(stderr, "Start.\n"); |
| 25 | |
| 26 | quiet = argc > 1; |
| 27 | |
| 28 | s_mem = malloc(10); |
| 29 | if (0 && !quiet) |
| 30 | fprintf(stderr, "Pointer to allocated memory: %p\n", s_mem); |
| 31 | assert(s_mem); |
| 32 | pthread_create(&tid, NULL, thread_func, NULL); |
| 33 | |
| 34 | /* Write, which isn't coordinated with the free ==> a race |
| 35 | should be reported. */ |
| 36 | char c = s_mem[5]; |
| 37 | __asm__ __volatile__("" : : "r"((long)c) ); |
| 38 | |
| 39 | pthread_join(tid, NULL); |
| 40 | fprintf(stderr, "Done.\n"); |
| 41 | return 0; |
| 42 | } |