39 lines
758 B
C
39 lines
758 B
C
// 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();
|
|
}
|