Update

Lab5/code.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <pthread.h>
+void *hello(void *tid)
+{
+    printf("Hello from thread %ld\n", (long)tid);
+}
+
+int main()
+{
+    pthread_t tid[10];
+    long i;
+    for (i = 0; i < 10; i++)
+    {
+        pthread_create(&tid[i], NULL, hello, (void *)i);
+        pthread_join(tid[i], NULL);
+    }
+    pthread_exit(NULL);
+}

Lab5/makefile

@@ -0,0 +1,21 @@
+all: pi_serial.o pi_multi-thread.o code.o
+	gcc -o pi_serial pi_serial.o
+	gcc -o pi_multi-thread pi_multi-thread.o -lpthread
+	gcc -o code code.o -lpthread
+pi: pi_serial.o pi_multi-thread.o
+	gcc -o pi_serial pi_serial.o
+	gcc -o pi_multi-thread pi_multi-thread.o -lpthread
+pi_serial: pi_serial.o
+	gcc -o pi_serial pi_serial.o
+pi_multi-thread: pi_multi-thread.o
+	gcc -o pi_multi-thread pi_multi-thread.o -lpthread
+code: code.o
+	gcc -o code code.o -lpthread
+pi_serial.o: pi_serial.c
+	gcc -c pi_serial.c
+pi_multi-thread.o: pi_multi-thread.c
+	gcc -c pi_multi-thread.c
+code.o: code.c
+	gcc -c code.c
+clean:
+	rm -rf *.o pi_serial pi_multi-thread code

Lab5/pi_serial.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+int main(int argc, char *argv[])
+{
+    clock_t t1, t2;
+    srand(time(NULL));
+    double x, y;
+    int count, nPoints, i;
+    if (argc != 2)
+    {
+        fprintf(stderr, "usage: pi_serial <integer value>\n");
+        return -1;
+    }
+    nPoints = atoi(argv[1]);
+    if (nPoints < 0)
+    {
+        fprintf(stderr, "%d must be >= 0\n", nPoints);
+        return -1;
+    }
+    time(&t1);
+    count = 0;
+    unsigned int state = rand();
+    for (i = 0; i < nPoints; ++i)
+    {
+        x = (double)rand_r(&state) / RAND_MAX;
+        y = (double)rand_r(&state) / RAND_MAX;
+        if (x * x + y * y - 1 <= 0)
+        {
+            ++count;
+        }
+    }
+    time(&t2);
+    printf("Time to Execute: %lds\n", (t2 - t1));
+    printf("PI = %lf\n", 4 * (double)count / nPoints);
+    return 0;
+}