From 0183ce2e23134bd1805d481daa56d174865f7cb9 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Tue, 23 Nov 2021 21:33:09 +0100
Subject: tsdwl: add exam (thread blocks (?) )

---
 Year_3/TSDWL/ex_20131219/thread.c | 67 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Year_3/TSDWL/ex_20131219/thread.c

diff --git a/Year_3/TSDWL/ex_20131219/thread.c b/Year_3/TSDWL/ex_20131219/thread.c
new file mode 100644
index 0000000..e46d05b
--- /dev/null
+++ b/Year_3/TSDWL/ex_20131219/thread.c
@@ -0,0 +1,67 @@
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+int m;
+pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_cond_t cond;
+
+void*
+fn_t1(void* arg)
+{
+    int xrand;
+
+    while (1) {
+        pthread_mutex_lock(&mutex);
+        if (m >= 1 && m <= 5) {
+            xrand = (rand() % 10) + 1;
+            printf("Thread 1: (%d, %d)\n", m, xrand);
+            m = xrand;
+            pthread_cond_broadcast(&cond);
+            pthread_mutex_unlock(&mutex);
+        } else {
+            pthread_mutex_unlock(&mutex);
+            pthread_cond_wait(&cond, &mutex);
+        }
+    }
+
+    pthread_exit(NULL);
+}
+
+void*
+fn_t2(void* arg)
+{
+    int xrand;
+
+    while (1) {
+        pthread_mutex_lock(&mutex);
+        if (m >= 6 && m <= 10) {
+            xrand = (rand() % 10) + 1;
+            printf("Thread 2: (%d, %d)\n", m, xrand);
+            m = xrand;
+            pthread_cond_broadcast(&cond);
+            pthread_mutex_unlock(&mutex);
+        } else {
+            pthread_mutex_unlock(&mutex);
+            pthread_cond_wait(&cond, &mutex);
+        }
+    }
+
+    pthread_exit(NULL);
+}
+
+int
+main()
+{
+    pthread_t th[2];
+    srand(time(NULL));
+    m = (rand() % 10) + 1;
+
+    pthread_create(&th[0], NULL, (void*)&fn_t1, NULL);
+    pthread_create(&th[1], NULL, (void*)&fn_t2, NULL);
+    pthread_join(th[0], NULL);
+    pthread_join(th[1], NULL);
+
+    return 0;
+}
-- 
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