diff options
Diffstat (limited to 'Year_3/TSDWL/ex_20170203')
-rw-r--r-- | Year_3/TSDWL/ex_20170203/thread.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/Year_3/TSDWL/ex_20170203/thread.c b/Year_3/TSDWL/ex_20170203/thread.c new file mode 100644 index 0000000..3471f88 --- /dev/null +++ b/Year_3/TSDWL/ex_20170203/thread.c @@ -0,0 +1,81 @@ +#include <stdio.h> +#include <stdlib.h> +#include <pthread.h> +#include <time.h> +#include <unistd.h> + +int n; +pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; + +void* +fnO(void* arg) +{ + int xrand; + int count = 0; + + while (1) { + usleep(200 * 1000); + do { + xrand = rand(); + } while ((xrand % 2) == 1); + + count++; + pthread_mutex_lock(&mutex); + printf("Thread O, count = %d, old x = %d, x = %d, even = %d\n", count, n, n+xrand, ((n+xrand) % 2)==0); + n += xrand; + + if ((count == 1000) || (count >= 10 && (n%2) == 0)) { + pthread_mutex_unlock(&mutex); + break; + } + pthread_mutex_unlock(&mutex); + + } + + printf("Thread O terminated.\n"); + pthread_exit(NULL); +} + +void* +fnE(void* arg) +{ + int xrand; + int count = 0; + + while (1) { + usleep(200 * 1000); + do { + xrand = rand(); + } while ((xrand % 2) == 0); + + count++; + pthread_mutex_lock(&mutex); + printf("\tThread E, count = %d, old x = %d, x = %d, odd = %d\n", count, n, n+xrand, ((n+xrand) % 2)==1); + n += xrand; + + if ((count == 1000) || (count >= 10 && (n%2) == 1)) { + pthread_mutex_unlock(&mutex); + break; + } + pthread_mutex_unlock(&mutex); + } + + printf("\tThread E terminated.\n"); + pthread_exit(NULL); +} + +int +main() +{ + pthread_t tO, tE; + srand(time(NULL)); + n = 0; + + pthread_create(&tO, NULL, &fnO, NULL); + pthread_create(&tE, NULL, &fnE, NULL); + + pthread_join(tO, NULL); + pthread_join(tE, NULL); + + return 0; +} |