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authorSanto Cariotti <santo@dcariotti.me>2021-12-01 12:36:35 +0100
committerSanto Cariotti <santo@dcariotti.me>2021-12-01 12:36:35 +0100
commit071a8ee7b742498dc4714d06eaf55f6a40aeb7fa (patch)
tree7884e81d238cfa69d8230f2132cfce4271e2f5f4 /Year_3
parenta44b9ed57ffebfa5b13b29e94c7da97bed99911b (diff)
tsdwl: add exam
Diffstat (limited to 'Year_3')
-rw-r--r--Year_3/TSDWL/ex_unk1/thread.c55
1 files changed, 55 insertions, 0 deletions
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;
+}