1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
4 |
|
5 |
#include <sys/types.h> |
6 |
#include <unistd.h> |
7 |
#include <fcntl.h> |
8 |
#include <sched.h> |
9 |
|
10 |
#define STACKSIZE 2048 /* yeah */ |
11 |
|
12 |
#define REQ_QUIT 0 |
13 |
#define REQ_READ 1 |
14 |
#define REQ_WRITE 2 |
15 |
|
16 |
typedef struct { |
17 |
char stack[STACKSIZE]; |
18 |
} aio_thread; |
19 |
|
20 |
typedef struct { |
21 |
int type; |
22 |
aio_thread *thread; |
23 |
|
24 |
/* read/write */ |
25 |
int fd; |
26 |
off_t offset; |
27 |
size_t length; |
28 |
ssize_t result; |
29 |
int errorno; |
30 |
|
31 |
SV *data, *callback; |
32 |
void *dataptr; |
33 |
STRLEN dataoffset; |
34 |
} aio_cb; |
35 |
|
36 |
typedef aio_cb *aio_req; |
37 |
|
38 |
static int started; |
39 |
static int nreqs; |
40 |
static int reqpipe[2], respipe[2]; |
41 |
|
42 |
static int aio_proc(void *arg); |
43 |
|
44 |
static void |
45 |
start_thread(void) |
46 |
{ |
47 |
aio_thread *thr; |
48 |
|
49 |
New (0, thr, 1, aio_thread); |
50 |
|
51 |
if (clone (aio_proc, |
52 |
&(thr->stack[STACKSIZE]), |
53 |
CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND, |
54 |
thr) >= 0) |
55 |
started++; |
56 |
else |
57 |
Safefree (thr); |
58 |
} |
59 |
|
60 |
static void |
61 |
end_thread(void) |
62 |
{ |
63 |
aio_req req; |
64 |
New (0, req, 1, aio_cb); |
65 |
req->type = REQ_QUIT; |
66 |
write (reqpipe[1], &req, sizeof (aio_req)); |
67 |
} |
68 |
|
69 |
static void |
70 |
read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length, |
71 |
SV *data, STRLEN dataoffset, SV*callback) |
72 |
{ |
73 |
aio_req req; |
74 |
STRLEN svlen; |
75 |
char *svptr = SvPV (data, svlen); |
76 |
|
77 |
if (dataoffset < 0) |
78 |
dataoffset += svlen; |
79 |
|
80 |
if (dataoffset < 0 || dataoffset > svlen) |
81 |
croak ("data offset outside of string"); |
82 |
|
83 |
if (dowrite) |
84 |
{ |
85 |
/* write: check length and adjust. */ |
86 |
if (length < 0 || length + dataoffset > svlen) |
87 |
length = svlen - dataoffset; |
88 |
} |
89 |
else |
90 |
{ |
91 |
/* read: grow scalar as necessary */ |
92 |
svptr = SvGROW (data, length + dataoffset); |
93 |
} |
94 |
|
95 |
if (length < 0) |
96 |
croak ("length must not be negative"); |
97 |
|
98 |
New (0, req, 1, aio_cb); |
99 |
|
100 |
if (!req) |
101 |
croak ("out of memory during aio_req allocation"); |
102 |
|
103 |
req->type = dowrite ? REQ_WRITE : REQ_READ; |
104 |
req->fd = fd; |
105 |
req->offset = offset; |
106 |
req->length = length; |
107 |
req->data = SvREFCNT_inc (data); |
108 |
req->dataptr = (char *)svptr + dataoffset; |
109 |
req->callback = SvREFCNT_inc (callback); |
110 |
|
111 |
nreqs++; |
112 |
write (reqpipe[1], &req, sizeof (aio_req)); |
113 |
} |
114 |
|
115 |
static int |
116 |
poll_cb (pTHX) |
117 |
{ |
118 |
dSP; |
119 |
int count = 0; |
120 |
aio_req req; |
121 |
|
122 |
while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
123 |
{ |
124 |
if (req->type == REQ_QUIT) |
125 |
{ |
126 |
Safefree (req->thread); |
127 |
started--; |
128 |
} |
129 |
else |
130 |
{ |
131 |
int errorno = errno; |
132 |
errno = req->errorno; |
133 |
|
134 |
if (req->type == REQ_READ) |
135 |
SvCUR_set (req->data, req->dataoffset |
136 |
+ req->result > 0 ? req->result : 0); |
137 |
|
138 |
PUSHMARK (SP); |
139 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
140 |
PUTBACK; |
141 |
call_sv (req->callback, G_VOID); |
142 |
SPAGAIN; |
143 |
|
144 |
SvREFCNT_dec (req->data); |
145 |
SvREFCNT_dec (req->callback); |
146 |
|
147 |
errno = errorno; |
148 |
nreqs--; |
149 |
count++; |
150 |
} |
151 |
|
152 |
Safefree (req); |
153 |
} |
154 |
|
155 |
return count; |
156 |
} |
157 |
|
158 |
#undef errno |
159 |
#include <asm/unistd.h> |
160 |
|
161 |
static int |
162 |
aio_proc(void *thr_arg) |
163 |
{ |
164 |
aio_thread *thr = thr_arg; |
165 |
int sig; |
166 |
int errno; |
167 |
aio_req req; |
168 |
|
169 |
/* we rely on gcc's ability to create closures. */ |
170 |
_syscall3(int,lseek,int,fd,off_t,offset,int,whence); |
171 |
_syscall3(int,read,int,fd,char *,buf,off_t,count); |
172 |
_syscall3(int,write,int,fd,char *,buf,off_t,count); |
173 |
|
174 |
/* first get rid of any signals */ |
175 |
for (sig = 1; sig < _NSIG; sig++) |
176 |
signal (sig, SIG_DFL); |
177 |
|
178 |
signal (SIGPIPE, SIG_IGN); |
179 |
|
180 |
/* then loop */ |
181 |
while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) |
182 |
{ |
183 |
req->thread = thr; |
184 |
|
185 |
if (req->type == REQ_READ || req->type == REQ_WRITE) |
186 |
{ |
187 |
errno = 0; |
188 |
|
189 |
if (lseek (req->fd, req->offset, SEEK_SET) == req->offset) |
190 |
{ |
191 |
if (req->type == REQ_READ) |
192 |
req->result = read (req->fd, req->dataptr, req->length); |
193 |
else |
194 |
req->result = write(req->fd, req->dataptr, req->length); |
195 |
} |
196 |
|
197 |
req->errorno = errno; |
198 |
} |
199 |
else |
200 |
{ |
201 |
write (respipe[1], (void *)&req, sizeof (req)); |
202 |
break; |
203 |
} |
204 |
|
205 |
write (respipe[1], (void *)&req, sizeof (req)); |
206 |
} |
207 |
|
208 |
return 0; |
209 |
} |
210 |
|
211 |
MODULE = Linux::AIO PACKAGE = Linux::AIO |
212 |
|
213 |
BOOT: |
214 |
{ |
215 |
if (pipe (reqpipe) || pipe (respipe)) |
216 |
croak ("unable to initialize request or result pipe"); |
217 |
|
218 |
if (fcntl (respipe[0], F_SETFL, O_NONBLOCK)) |
219 |
croak ("cannot set result pipe to nonblocking mode"); |
220 |
} |
221 |
|
222 |
void |
223 |
min_parallel(nthreads) |
224 |
int nthreads |
225 |
PROTOTYPE: $ |
226 |
CODE: |
227 |
while (nthreads > started) |
228 |
start_thread (); |
229 |
|
230 |
void |
231 |
max_parallel(nthreads) |
232 |
int nthreads |
233 |
PROTOTYPE: $ |
234 |
CODE: |
235 |
int cur = started; |
236 |
while (cur > nthreads) |
237 |
{ |
238 |
end_thread (); |
239 |
cur--; |
240 |
} |
241 |
|
242 |
poll_cb (); |
243 |
while (started > nthreads) |
244 |
{ |
245 |
sched_yield (); |
246 |
poll_cb (); |
247 |
} |
248 |
|
249 |
void |
250 |
aio_read(fh,offset,length,data,dataoffset,callback) |
251 |
PerlIO * fh |
252 |
UV offset |
253 |
STRLEN length |
254 |
SV * data |
255 |
STRLEN dataoffset |
256 |
SV * callback |
257 |
PROTOTYPE: $$$$$$ |
258 |
ALIAS: |
259 |
aio_write = 1 |
260 |
CODE: |
261 |
SvUPGRADE (data, SVt_PV); |
262 |
SvPOK_on (data); |
263 |
read_write (aTHX_ ix, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
264 |
|
265 |
int |
266 |
poll_fileno() |
267 |
PROTOTYPE: |
268 |
CODE: |
269 |
RETVAL = respipe[0]; |
270 |
OUTPUT: |
271 |
RETVAL |
272 |
|
273 |
int |
274 |
poll_cb(...) |
275 |
PROTOTYPE: |
276 |
CODE: |
277 |
RETVAL = poll_cb (aTHX); |
278 |
OUTPUT: |
279 |
RETVAL |
280 |
|
281 |
int |
282 |
nreqs() |
283 |
PROTOTYPE: |
284 |
CODE: |
285 |
RETVAL = nreqs; |
286 |
OUTPUT: |
287 |
RETVAL |
288 |
|