Added lec14

lec13/threadtest.c

@@ -8,7 +8,8 @@ int bbb = 0;
 void fn_s()
 {
 	static int a = 0; 
-    printf("== %d %d ==\n",a++, bbb++);
+	setvbuf(stdout, _IOFBF, NULL, 10);
+    	printf("== %.2d %.2d ==",a++, bbb++);
 }
 
 

lec14/mutextest.c

+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+int bbb = 0; 
+
+void fn_s()
+{
+	static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+    	static int a = 0; 
+    	printf("<= %d %d =>",a, bbb);
+    	pthread_mutex_lock(&mutex);
+	a++; bbb++;
+    	pthread_mutex_unlock(&mutex);
+}
+
+
+void *run (void *arg)
+{
+    printf("Hello world of POSXI threads.%d\n", (int) pthread_self() );
+    for (int i = 0; i < 1000000; i++)
+	{
+		//usleep(10000); 
+		fn_s(); 
+	}
+    return 0;
+
+}
+
+int main()
+{
+	pthread_t thread1;
+	pthread_t thread2;
+	pthread_t thread3;
+	int result1, result2, result3;
+
+	pthread_create(&thread1, NULL, run, NULL );
+	pthread_create(&thread2, NULL, run, NULL );
+	pthread_create(&thread3, NULL, run, NULL );
+	run((void *) 0); 
+	pthread_join(thread1, (void **) &result1);
+	pthread_join(thread2, (void **) &result2);
+	pthread_join(thread3, (void **) &result3);
+	printf("\nThread return %d at the end\n", result1);
+}
+

lec14/prtest.c

+#include <stdio.h>
+
+int main()
+{
+	char a;
+	short b;
+	int c;
+	long long d;
+	fscanf(stdin, "%d %d %d %d", &a, &b, &c, &d);
+	fprintf(stdout, "%d %d %d %d\n", a, b, c, d);
+}

lec14/th4.c

+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+int bbb = 0; 
+
+void fn_s()
+{
+	static int a = 0; 
+	printf("== %d %d ==",a++, bbb++);
+	fflush(stdout);
+}
+
+
+void *run (void *arg)
+{
+	printf("Hello world of POSIX threads.%d\n", (int) (0) );
+	for (int i = 0; i < 10; i++)
+	{
+		sleep(1); 
+		fn_s(); 
+	}
+	return 0;
+}
+
+int main()
+{
+	int result1;
+    	//char bufff[10]; 
+    	//setvbuf(stdout,bufff,  _IONBF, 10); 
+	run((void *) 0); 
+	printf("Thread return %d at the end\n", result1);
+}
+

lec14/threadtest.c

+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+int bbb = 0; 
+
+void fn_s()
+{
+	static int a = 0; 
+    	printf("<= %.4d %.4d =>",a++, bbb++);
+	fflush(stdout);
+}
+
+
+void *run (void *arg)
+{
+	printf("Hello world of POSIX threads.%d\n", (int) pthread_self() );
+	for (int i = 0; i < 100; i++)
+	{
+		usleep(10000); 
+		fn_s(); 
+	}
+    return 0;
+
+}
+
+int main()
+{
+	pthread_t thread1;
+	pthread_t thread2;
+	pthread_t thread3;
+	int result1;
+	int result2;
+	pthread_create(&thread1, NULL, run, NULL );
+	printf("\nJUST AFTER THE CREATE\n");
+	run((void *) 0);
+	pthread_create(&thread2, NULL, run, NULL );
+	pthread_create(&thread3, NULL, run, NULL );
+	pthread_join(thread1, (void **) &result1);
+	pthread_join(thread2, (void **) &result2);
+	printf("\nThread return %d at the end\n", result1);
+	printf("Thread return %d at the end\n", result2);
+}
+