From 071a8ee7b742498dc4714d06eaf55f6a40aeb7fa Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Wed, 1 Dec 2021 12:36:35 +0100
Subject: tsdwl: add exam

---
 Year_3/TSDWL/ex_unk1/thread.c | 55 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 Year_3/TSDWL/ex_unk1/thread.c

diff --git a/Year_3/TSDWL/ex_unk1/thread.c b/Year_3/TSDWL/ex_unk1/thread.c
new file mode 100644
index 0000000..8fdefc9
--- /dev/null
+++ b/Year_3/TSDWL/ex_unk1/thread.c
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <string.h>
+
+int x = 0;
+pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+
+void*
+fn(void* arg)
+{
+    char* thread_name = (char*) arg;
+    int xrand;
+    long hit;
+
+    hit = 0;
+    while (1) {
+        xrand = rand() % 1000;
+        usleep(xrand);
+
+        pthread_mutex_lock(&mutex);
+        if (x > 500) {
+            printf("I'm the thread %s with hit = '%ld' and x = '%d'\n", thread_name, hit, x);
+            pthread_mutex_unlock(&mutex);
+            break;
+        }
+        x++;
+        pthread_mutex_unlock(&mutex);
+
+        hit++;
+    }
+
+    pthread_exit((void*) hit);
+}
+
+int
+main()
+{
+    pthread_t tA, tB;
+    void *result1, *result2;
+    long total;
+    srand(time(NULL));
+
+    pthread_create(&tA, NULL, &fn, (void*) "A");
+    pthread_create(&tB, NULL, &fn, (void*) "B");
+
+    pthread_join(tA, &result1);
+    pthread_join(tB, &result2);
+
+    total = (long) result1 + (long) result2;
+    printf("Total = %ld + %ld = %ld'\n", (long) result1, (long) result2, total);
+    return 0;
+}
-- 
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