Mercurial > hg > Members > innparusu > xv6-rpi
comparison src/usr/stressfs.c @ 0:83c23a36980d
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author | Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp> |
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date | Fri, 26 May 2017 23:11:05 +0900 |
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-1:000000000000 | 0:83c23a36980d |
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1 // Demonstrate that moving the "acquire" in iderw after the loop that | |
2 // appends to the idequeue results in a race. | |
3 | |
4 // For this to work, you should also add a spin within iderw's | |
5 // idequeue traversal loop. Adding the following demonstrated a panic | |
6 // after about 5 runs of stressfs in QEMU on a 2.1GHz CPU: | |
7 // for (i = 0; i < 40000; i++) | |
8 // asm volatile(""); | |
9 | |
10 #include "types.h" | |
11 #include "stat.h" | |
12 #include "user.h" | |
13 #include "fs.h" | |
14 #include "fcntl.h" | |
15 | |
16 int | |
17 main(int argc, char *argv[]) | |
18 { | |
19 int fd, i; | |
20 char path[] = "stressfs0"; | |
21 char data[512]; | |
22 | |
23 printf(1, "stressfs starting\n"); | |
24 memset(data, 'a', sizeof(data)); | |
25 | |
26 for(i = 0; i < 4; i++) | |
27 if(fork() > 0) | |
28 break; | |
29 | |
30 printf(1, "write %d\n", i); | |
31 | |
32 path[8] += i; | |
33 fd = open(path, O_CREATE | O_RDWR); | |
34 for(i = 0; i < 20; i++) | |
35 // printf(fd, "%d\n", i); | |
36 write(fd, data, sizeof(data)); | |
37 close(fd); | |
38 | |
39 printf(1, "read\n"); | |
40 | |
41 fd = open(path, O_RDONLY); | |
42 for (i = 0; i < 20; i++) | |
43 read(fd, data, sizeof(data)); | |
44 close(fd); | |
45 | |
46 wait(); | |
47 | |
48 exit(); | |
49 } |