Initial commit

+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <errno.h>
+
+int calcpi() {
+    int r[2800 + 1];
+    int i, k;
+    int b, d;
+    int c = 0;
+
+    for (i = 0; i < 2800; i++) {
+        r[i] = 2000;
+    }
+
+    for (k = 2800; k > 0; k -= 14) {
+        d = 0;
+
+        i = k;
+        for (;;) {
+            d += r[i] * 10000;
+            b = 2 * i - 1;
+
+            r[i] = d % b;
+            d /= b;
+            i--;
+            if (i == 0) break;
+            d *= i;
+        }
+        c = d % 10000;
+    }
+
+    return 0;
+}
+
+void * thread_main(void * ptr) {
+	while (1 == 1) calcpi();
+}
+
+int main(int argc, char * * argv) {
+	if(argc < 2) {
+		printf("\nUsage: %s <n> <p>\n\nWhere\n<n> is the number of threads to run in parallell\n<p> is the priority (optional)\n\n", argv[0]);
+		return 0;
+	}
+	int numT = atoi(argv[1]);
+	printf("\nStarting %d threads calculating PI. Hit Cntrl-C to stop or send a kill signal\n",numT);
+	pthread_t lastT;
+	int prio = 0;
+	if(argc == 3) {
+		prio = atoi(argv[2]);
+		errno = 0;
+		int res = nice(prio);
+		if(errno != 0) {
+			printf("Setting nice %d failed (code %d), are you root?\n", prio, errno);
+		} else {
+			printf("Process nice value set to %d\n", res);
+		}
+	}
+	for(int x=0; x < numT; x++) {
+		pthread_create(&lastT, NULL, thread_main, NULL);
+	}
+	pthread_join(lastT, NULL);
+	exit(0);
+}