| Jeff Brown | ed07e00 | 2011-02-03 17:46:23 -0800 | [diff] [blame] | 1 | /* Test data race detection between floating point variables. */ |
| 2 | |
| 3 | |
| 4 | #include <assert.h> |
| 5 | #include <stdio.h> /* printf() */ |
| 6 | #include <pthread.h> |
| 7 | #include <unistd.h> /* sleep() */ |
| 8 | |
| 9 | |
| 10 | /* Local functions declarations. */ |
| 11 | |
| 12 | static void* thread_func(void*); |
| 13 | |
| 14 | |
| 15 | /* Local variables. */ |
| 16 | |
| 17 | /* s_mutex protects s_d3. */ |
| 18 | static pthread_mutex_t s_mutex; |
| 19 | |
| 20 | static double s_d1; /* accessed before thread creation and in the created */ |
| 21 | /* thread (not a race). */ |
| 22 | static double s_d2; /* accessed in the created thread and after the join */ |
| 23 | /* (not a race). */ |
| 24 | static double s_d3; /* accessed simultaneously from both threads (race). */ |
| 25 | static int s_debug = 0; |
| 26 | static int s_do_printf = 0; |
| 27 | static int s_use_mutex = 0; |
| 28 | |
| 29 | |
| 30 | /* Function definitions. */ |
| 31 | |
| 32 | int main(int argc, char** argv) |
| 33 | { |
| 34 | int optchar; |
| 35 | pthread_t threadid; |
| 36 | |
| 37 | while ((optchar = getopt(argc, argv, "dmp")) != EOF) |
| 38 | { |
| 39 | switch (optchar) |
| 40 | { |
| 41 | case 'd': |
| 42 | s_debug = 1; |
| 43 | break; |
| 44 | case 'm': |
| 45 | s_use_mutex = 1; |
| 46 | break; |
| 47 | case 'p': |
| 48 | s_do_printf = 1; |
| 49 | break; |
| 50 | default: |
| 51 | assert(0); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | pthread_mutex_init(&s_mutex, 0); |
| 56 | |
| 57 | /* |
| 58 | * Switch to line-buffered mode, such that timing information can be |
| 59 | * obtained for each printf() call with strace. |
| 60 | */ |
| 61 | setlinebuf(stdout); |
| 62 | |
| 63 | if (s_debug) |
| 64 | { |
| 65 | printf("&s_d1 = %p; &s_d2 = %p; &s_d3 = %p\n", &s_d1, &s_d2, &s_d3); |
| 66 | } |
| 67 | |
| 68 | s_d1 = 1; |
| 69 | s_d3 = 3; |
| 70 | |
| 71 | pthread_create(&threadid, 0, thread_func, 0); |
| 72 | |
| 73 | sleep(1); /* Wait until thread_func() finished. */ |
| 74 | |
| 75 | { |
| 76 | if (s_use_mutex) pthread_mutex_lock(&s_mutex); |
| 77 | s_d3++; |
| 78 | if (s_use_mutex) pthread_mutex_unlock(&s_mutex); |
| 79 | } |
| 80 | |
| 81 | /* Wait until the thread finished. */ |
| 82 | pthread_join(threadid, 0); |
| 83 | if (s_do_printf) printf("s_d2 = %g (should be 2)\n", s_d2); |
| 84 | if (s_do_printf) printf("s_d3 = %g (should be 5)\n", s_d3); |
| 85 | |
| 86 | pthread_mutex_destroy(&s_mutex); |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static void* thread_func(void* thread_arg) |
| 92 | { |
| 93 | if (s_do_printf) |
| 94 | { |
| 95 | printf("s_d1 = %g (should be 1)\n", s_d1); |
| 96 | } |
| 97 | s_d2 = 2; |
| 98 | { |
| 99 | if (s_use_mutex) pthread_mutex_lock(&s_mutex); |
| 100 | s_d3++; |
| 101 | if (s_use_mutex) pthread_mutex_unlock(&s_mutex); |
| 102 | } |
| 103 | return 0; |
| 104 | } |