您最多选择25个主题
主题必须以字母或数字开头，可以包含连字符 (-)，并且长度不得超过35个字符
39 行
667 B
39 行
667 B
#include <ulib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#define DEPTH 4
|
|
#define SLEEP_TIME 400
|
|
void forktree(const char *cur);
|
|
|
|
void
|
|
forkchild(const char *cur, char branch) {
|
|
char nxt[DEPTH + 1];
|
|
|
|
if (strlen(cur) >= DEPTH)
|
|
return;
|
|
|
|
snprintf(nxt, DEPTH + 1, "%s%c", cur, branch);
|
|
if (fork() == 0) {
|
|
forktree(nxt);
|
|
yield();
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
void
|
|
forktree(const char *cur) {
|
|
cprintf("%04x: I am '%s'\n", getpid(), cur);
|
|
|
|
forkchild(cur, '0');
|
|
forkchild(cur, '1');
|
|
}
|
|
|
|
int
|
|
main(void) {
|
|
cprintf("forktree process will sleep %d ticks\n",SLEEP_TIME);
|
|
sleep(SLEEP_TIME);
|
|
forktree("");
|
|
return 0;
|
|
}
|
|
|