From 5985b13797106e1caf3bb195e52e431dfe188512 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Tue, 23 Nov 2021 20:25:33 +0100
Subject: tsdwl: add exam
---
Year_3/TSDWL/ex_20191218/thread.c | 72 +++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
create mode 100644 Year_3/TSDWL/ex_20191218/thread.c
diff --git a/Year_3/TSDWL/ex_20191218/thread.c b/Year_3/TSDWL/ex_20191218/thread.c
new file mode 100644
index 0000000..7d77646
--- /dev/null
+++ b/Year_3/TSDWL/ex_20191218/thread.c
@@ -0,0 +1,72 @@
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+
+int x;
+pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_cond_t cond;
+
+void*
+t1_fn(void* arg)
+{
+ int m;
+
+ while (1) {
+ usleep(100 * 1000);
+ m = rand() % 11;
+
+ pthread_mutex_lock(&mutex);
+ printf("th1: (x=%d, m=%d):", x, m);
+ if (x == -1) {
+ break;
+ } else if (x == m) {
+ printf("RISPOSTA CORRETTA\n");
+ x = -1;
+ break;
+ } else if (abs(x-m) > 5) {
+ printf("risposta MOLTO sbagliata\n");
+ pthread_mutex_unlock(&mutex);
+ pthread_cond_wait(&cond, &mutex);
+ } else {
+ printf("risposta sbagliata\n");
+ }
+ pthread_mutex_unlock(&mutex);
+ }
+
+ pthread_mutex_unlock(&mutex);
+ pthread_exit(NULL);
+}
+
+void*
+t2_fn(void* arg)
+{
+ while (1) {
+ usleep(300* 1000);
+ pthread_mutex_lock(&mutex);
+ printf("\tthread 2 %d\n", x);
+ if (x == -1) {
+ pthread_mutex_unlock(&mutex);
+ pthread_exit(NULL);
+ }
+ pthread_cond_signal(&cond);
+ pthread_mutex_unlock(&mutex);
+ }
+}
+
+int
+main()
+{
+ pthread_t t1, t2;
+ srand(time(NULL));
+ x = rand() % 11;
+
+ pthread_create(&t1, NULL, t1_fn, NULL);
+ pthread_create(&t2, NULL, t2_fn, NULL);
+ pthread_join(t1, NULL);
+ pthread_join(t2, NULL);
+
+ return 0;
+}
--
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