xv6-cs450/stressfs.c

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// Demonstrate that moving the "acquire" in iderw after the loop that
// appends to the idequeue results in a race.
// For this to work, you should also add a spin within iderw's
// idequeue traversal loop. Spinning 40000 times demonstrated the bug
// after about 5 runs of stressfs in QEMU on a 2.1GHz CPU.
#include "types.h"
#include "stat.h"
#include "user.h"
#include "fs.h"
#include "fcntl.h"
int
main(int argc, char *argv[])
{
int i;
printf(1, "stressfs starting\n");
for (i = 0; i < 4; i++) {
if (fork() > 0) {
break;
}
}
printf(1, "%d\n", i);
char path[] = "stressfs0";
path[8] += i;
int fd = open(path, O_CREATE | O_RDWR);
for (i = 0; i < 100; i++)
printf(fd, "%d\n", i);
close(fd);
wait();
exit();
}