first commit

CS4210/Readings/ThreadsSquare.c

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+#include<pthread.h>
+#include <stdio.h>
+
+/* Example program creating thread to compute square of value */
+
+int value;			/* thread stores result here */
+void *my_thread(void *param);	/* the thread */
+
+main (int argc, char *argv[])
+{
+	pthread_t tid;		/* thread identifier */
+	int retcode;
+
+	/* check input parameters */
+	if (argc != 2) {
+		fprintf (stderr, "usage: a.out <integer value>\n");
+		exit(0);
+	}
+
+	/* create the thread */
+	retcode = pthread_create(&tid,NULL,my_thread,argv[1]);
+	if (retcode != 0) {
+		fprintf (stderr, "Unable to create thread\n");
+		exit (1);
+	}
+
+	/* wait for created thread to exit */
+	pthread_join(tid,NULL);
+	printf ("I am the parent: Square = %d\n", value);
+}
+
+
+/* The thread will begin control in this function */
+void *my_thread(void *param)
+{
+	int i = atoi (param);
+
+	printf ("I am the child, passed value %d\n", i);
+	value = i * i;
+
+	/* next line is not really necessary */
+	pthread_exit(0);
+}
+