Nelze vybrat více než 25 témat
Téma musí začínat písmenem nebo číslem, může obsahovat pomlčky („-“) a může být dlouhé až 35 znaků.
84 řádky
1.7 KiB
84 řádky
1.7 KiB
#include <ulib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#define MATSIZE 10
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static int mata[MATSIZE][MATSIZE];
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static int matb[MATSIZE][MATSIZE];
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static int matc[MATSIZE][MATSIZE];
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void
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work(unsigned int times) {
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int i, j, k, size = MATSIZE;
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for (i = 0; i < size; i ++) {
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for (j = 0; j < size; j ++) {
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mata[i][j] = matb[i][j] = 1;
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}
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}
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yield();
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cprintf("pid %d is running (%d times)!.\n", getpid(), times);
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while (times -- > 0) {
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for (i = 0; i < size; i ++) {
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for (j = 0; j < size; j ++) {
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matc[i][j] = 0;
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for (k = 0; k < size; k ++) {
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matc[i][j] += mata[i][k] * matb[k][j];
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}
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}
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}
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for (i = 0; i < size; i ++) {
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for (j = 0; j < size; j ++) {
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mata[i][j] = matb[i][j] = matc[i][j];
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}
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}
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}
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cprintf("pid %d done!.\n", getpid());
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exit(0);
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}
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const int total = 21;
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int
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main(void) {
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int pids[total];
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memset(pids, 0, sizeof(pids));
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int i;
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for (i = 0; i < total; i ++) {
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if ((pids[i] = fork()) == 0) {
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srand(i * i);
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int times = (((unsigned int)rand()) % total);
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times = (times * times + 10) * 100;
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work(times);
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}
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if (pids[i] < 0) {
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goto failed;
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}
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}
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cprintf("fork ok.\n");
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for (i = 0; i < total; i ++) {
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if (wait() != 0) {
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cprintf("wait failed.\n");
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goto failed;
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}
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}
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cprintf("matrix pass.\n");
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return 0;
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failed:
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for (i = 0; i < total; i ++) {
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if (pids[i] > 0) {
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kill(pids[i]);
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}
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}
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panic("FAIL: T.T\n");
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}
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