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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
#include <ccan/io/io.h>
#include <ccan/time/time.h>
#include <sys/wait.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <err.h>
#include <signal.h>
#define NUM 500
#define NUM_ITERS 10000
struct buffer {
int iters;
struct io_conn *reader, *writer;
char buf[32];
};
static struct io_plan poke_reader(struct io_conn *conn, struct buffer *buf);
static struct io_plan poke_writer(struct io_conn *conn, struct buffer *buf)
{
assert(conn == buf->reader);
if (buf->iters == NUM_ITERS)
return io_close();
/* You write. */
io_wake(buf->writer,
io_write(&buf->buf, sizeof(buf->buf), poke_reader, buf));
/* I'll wait until you wake me. */
return io_idle();
}
static struct io_plan poke_reader(struct io_conn *conn, struct buffer *buf)
{
assert(conn == buf->writer);
/* You read. */
io_wake(buf->reader,
io_read(&buf->buf, sizeof(buf->buf), poke_writer, buf));
if (++buf->iters == NUM_ITERS)
return io_close();
/* I'll wait until you tell me to write. */
return io_idle();
}
int main(void)
{
unsigned int i;
int fds[2], last_read, last_write;
struct timespec start, end;
struct buffer buf[NUM];
if (pipe(fds) != 0)
err(1, "pipe");
last_read = fds[0];
last_write = fds[1];
for (i = 1; i < NUM; i++) {
buf[i].iters = 0;
if (pipe(fds) < 0)
err(1, "pipe");
memset(buf[i].buf, i, sizeof(buf[i].buf));
sprintf(buf[i].buf, "%i-%i", i, i);
buf[i].reader = io_new_conn(last_read, io_idle());
if (!buf[i].reader)
err(1, "Creating reader %i", i);
buf[i].writer = io_new_conn(fds[1],
io_write(&buf[i].buf,
sizeof(buf[i].buf),
poke_reader, &buf[i]));
if (!buf[i].writer)
err(1, "Creating writer %i", i);
last_read = fds[0];
}
/* Last one completes the cirle. */
i = 0;
buf[i].iters = 0;
sprintf(buf[i].buf, "%i-%i", i, i);
buf[i].reader = io_new_conn(last_read, io_idle());
if (!buf[i].reader)
err(1, "Creating reader %i", i);
buf[i].writer = io_new_conn(last_write, io_write(&buf[i].buf,
sizeof(buf[i].buf),
poke_reader, &buf[i]));
if (!buf[i].writer)
err(1, "Creating writer %i", i);
/* They should eventually exit */
start = time_now();
if (io_loop() != NULL)
errx(1, "io_loop?");
end = time_now();
for (i = 0; i < NUM; i++) {
char b[sizeof(buf[0].buf)];
memset(b, i, sizeof(b));
sprintf(b, "%i-%i", i, i);
if (memcmp(b, buf[(i + NUM_ITERS) % NUM].buf, sizeof(b)) != 0)
errx(1, "Buffer for %i was '%s' not '%s'",
i, buf[(i + NUM_ITERS) % NUM].buf, b);
}
printf("run-many: %u %u iterations: %llu usec\n",
NUM, NUM_ITERS, (long long)time_to_usec(time_sub(end, start)));
return 0;
}
|
