1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/* klaar@ida (convert to built-in pintos test)
Tests that read and write are properly synchronized. Also stresses
the filesystem somewhat.
pfs_reader and pfs_writer are needed child processes.
*/
#include <syscall.h>
#include <random.h>
#include <stdio.h>
#include <stdlib.h>
#include "../lib.h"
#include "pfs.h"
static void swap(char* a, char* b)
{
char c = *a;
*a = *b;
*b = c;
}
static void start_rw(int rn, int wn)
{
int rpid = -1;
int wpid = -1;
if ( rn > 0 )
{
rpid = exec ("pfs-reader");
msg ("exec(\"pfs-reader\"): %d", rpid);
}
if ( wn > 0 )
{
int range = '~' - '!' + 1; // ascii 32 - 126
char start = '!' + random_ulong () % range;
char end = '!' + random_ulong () % range;
if ( end < start )
swap(&start, &end);
const int CMDSIZE = 64;
char cmd[CMDSIZE];
snprintf (cmd, CMDSIZE, "pfs-writer %c %c", start, end);
wpid = exec (cmd);
msg ("exec(\"%s\"): %d", cmd, wpid);
}
if ( rn > 0 || wn > 0 )
start_rw(rn-1, wn-1);
if ( rpid != -1 )
CHECK( wait( rpid ) != -1, "wait pfs-reader %d", rpid);
if ( wpid != -1 )
CHECK( wait( wpid ) != -1, "wait pfs-writer %d", wpid);
}
int main (int argc, char *argv[])
{
if ( argc != 3 )
fail("usage: pfs START END");
quiet = true;
test_name = argv[0];
int num_reader = atoi(argv[1]);
int num_writer = atoi(argv[2]);
msg ("begin");
CHECK (create ("file.1", BIG), "create \"file.1\"");
CHECK (create ("messages", TIMES), "create \"messages\"");
random_init (0);
start_rw(num_reader, num_writer);
msg ("end");
return 0;
}
|
