#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <wait.h>
int main(int argc, char **argv) {
	FILE *file;
	pid_t pid;
	
	if ((file = fopen("u3a5.txt", "w")) == NULL) {
		exit(1);
	}
	
	pid = fork();
	int i;
	switch (pid) {
		case -1:
			printf("Fehler bei Erzeugung des Kindprozesses!");
			break;
		case 0:
			sleep(1);
			for (i = 0; i<10; i++) {
				fprintf(file, "Child: \%d \n", i);
			}
			break;
		default:
			sleep(1);
			for (i = 0; i<10; i++) {
				fprintf(file, "Parent: \%d \n", i);
			}

			break;
	}
	fclose(file);
	
	exit(0);
	

}

void matrix_mult(int A[MATRIXSIZE][MATRIXSIZE],int B[MATRIXSIZE][MATRIXSIZE], int C[MATRIXSIZE][MATRIXSIZE]) {
	int y, x, k, s;	

	for(y = 0; y < MATRIXSIZE; y++) {
		for(x = 0; x < MATRIXSIZE; x++) {
			s = 0;
			for(k = 0; k < MATRIXSIZE; k++) {
				s = s + (B[y][k] * C[k][x]);
			}
			A[y][x] = s;
		}
	}
}

void matrix_mult1(int A[MATRIXSIZE][MATRIXSIZE],int B[MATRIXSIZE][MATRIXSIZE], int C[MATRIXSIZE][MATRIXSIZE]) {
	int y, x, k, s;	

	for(y = 0; y < (MATRIXSIZE/2) ; y++) {
		for(x = 0; x < MATRIXSIZE; x++) {
			s = 0;
			for(k = 0; k < MATRIXSIZE; k++) {
				s = s + (B[y][k] * C[k][x]);
			}
			A[y][x] = s;
		}
	}
}

void matrix_mult2(int A[MATRIXSIZE][MATRIXSIZE],int B[MATRIXSIZE][MATRIXSIZE], int C[MATRIXSIZE][MATRIXSIZE]) {
	int y, x, k, s;	

	for(y = (MATRIXSIZE/2); y < MATRIXSIZE; y++) {
		for(x = 0; x < MATRIXSIZE; x++) {
			s = 0;
			for(k = 0; k < MATRIXSIZE; k++) {
				s = s + (B[y][k] * C[k][x]);
			}
			A[y][x] = s;
		}
	}
}

Matrix A
 0:    4    3    2    1
 1:    5    4    3    2
 2:    6    5    4    3
 3:    7    6    5    4

Matrix B
 0:    4    3    2    1
 1:    5    4    3    2
 2:    6    5    4    3
 3:    7    6    5    4

Multipliziere Matrix A und B
 0:    0    0 1374164672 16777216
 1:    0 1375745624    0    0
 2:   94   76   58   40
 3:  116   94   72   50

Multipliziere Matrix A und B
 0: -100927200    0 1389530640 -553639808
 1: 1329016532 8871296 -162814044 -1281931516
 2:    4 134520788 1582242968 134515190
 3: 1374258263 1374594139    0 1375685670
Killed

triggertg@life-ends ~/studium/betriebssysteme/vorbereitung $ gcc -o u6a2 u6a2.c
u6a2.c:70:2: warning: no newline at end of file
/tmp/ccspTpxH.o: In function `main':
u6a2.c:(.text+0xf8): undefined reference to `pthread_create'
u6a2.c:(.text+0x119): undefined reference to `pthread_create'
u6a2.c:(.text+0x12c): undefined reference to `pthread_join'
u6a2.c:(.text+0x13f): undefined reference to `pthread_join'
collect2: ld returned 1 exit status