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
|
#include "u.h"
#include "libc.h"
#include "thread.h"
enum
{
STACK = 8192
};
int max = 10000;
int (*mk)(void (*fn)(void*), void *arg, uint stack);
void printmsg(void*, char*);
void
countthread(void *v)
{
uint i;
Channel *c;
c = v;
for(i=2;; i++){
sendul(c, i);
}
}
void
filterthread(void *v)
{
uint i, p;
Channel *c, *nextc;
c = v;
p = recvul(c);
print("%d\n", p);
if(p > max)
threadexitsall(0);
nextc = chancreate(sizeof(ulong), 0);
mk(filterthread, nextc, STACK);
for(;;){
i = recvul(c);
if(i%p)
sendul(nextc, i);
}
}
void
usage(void)
{
fprint(2, "usage: tprimes [-p] [max]\n");
threadexitsall("usage");
}
void
threadmain(int argc, char **argv)
{
Channel *c;
int nbuf;
notify(printmsg);
nbuf = 0;
mk = threadcreate;
ARGBEGIN{
default:
usage();
case 'b':
nbuf = atoi(EARGF(usage()));
break;
case 'p':
mk = proccreate;
max = 1000;
break;
}ARGEND
if(argc == 1)
max = atoi(argv[0]);
else if(argc)
usage();
c = chancreate(sizeof(ulong), nbuf);
mk(countthread, c, STACK);
mk(filterthread, c, STACK);
recvp(chancreate(sizeof(void*), 0));
threadexitsall(0);
}
void
printmsg(void *v, char *msg)
{
print("note: %s\n", msg);
}
|