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Comparing Linux-AIO/AIO.xs (file contents):
Revision 1.1 by root, Tue Aug 14 03:18:53 2001 UTC vs.
Revision 1.11 by root, Mon Oct 8 12:58:41 2001 UTC

… …
2#include "perl.h" 2#include "perl.h"
3#include "XSUB.h" 3#include "XSUB.h"
4 4
5#include <sys/types.h> 5#include <sys/types.h>
6#include <unistd.h> 6#include <unistd.h>
7#include <fcntl.h>
8#include <signal.h>
7#include <sched.h> 9#include <sched.h>
8 10
9#define STACKSIZE 128 /* yeah */ 11#define STACKSIZE 1024 /* yeah */
10 12
11#define REQ_EXIT 0 13enum { REQ_QUIT, REQ_READ, REQ_WRITE, REQ_OPEN, REQ_CLOSE };
12#define REQ_READ 1
13#define REQ_WRITE 2
14 14
15typedef struct { 15typedef struct {
16 char stack[STACKSIZE]; 16 char stack[STACKSIZE];
17} aio_thread; 17} aio_thread;
18 18
… …
22 22
23/* read/write */ 23/* read/write */
24 int fd; 24 int fd;
25 off_t offset; 25 off_t offset;
26 size_t length; 26 size_t length;
27 ssize_t done; 27 ssize_t result;
28 mode_t mode; /* open */
28 int errorno; 29 int errorno;
29 30 SV *data, *callback;
30 SV *data;
31 void *dataptr; 31 void *dataptr;
32 STRLEN offset; 32 STRLEN dataoffset;
33} aio_cb; 33} aio_cb;
34 34
35typedef aio_cb *aio_req; 35typedef aio_cb *aio_req;
36 36
37static int started; 37static int started;
38static int nreqs;
38static int reqpipe[2], respipe[2]; 39static int reqpipe[2], respipe[2];
40
41static int aio_proc(void *arg);
39 42
40static void 43static void
41start_thread(void) 44start_thread(void)
42{ 45{
43 aio_thread *thr = NEW ( 46 aio_thread *thr;
47
48 New (0, thr, 1, aio_thread);
49
44 __clone (aio_proc, 50 if (clone (aio_proc,
51 &(thr->stack[STACKSIZE]),
52 CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND,
53 thr) >= 0)
54 started++;
55 else
56 Safefree (thr);
45} 57}
46 58
47static void 59static void
48end_thread(void) 60end_thread(void)
49{ 61{
50 aio_req req = 0; 62 aio_req req;
63 New (0, req, 1, aio_cb);
64 req->type = REQ_QUIT;
51 write (reqpipe[1], &req, sizeof (aio_req)); 65 write (reqpipe[1], &req, sizeof (aio_req));
52 nthreads--; 66}
67
68static void
69send_req (aio_req req)
70{
71 nreqs++;
72 write (reqpipe[1], &req, sizeof (aio_req));
73}
74
75static void
76read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length,
77 SV *data, STRLEN dataoffset, SV*callback)
78{
79 aio_req req;
80 STRLEN svlen;
81 char *svptr = SvPV (data, svlen);
82
83 if (dataoffset < 0)
84 dataoffset += svlen;
85
86 if (dataoffset < 0 || dataoffset > svlen)
87 croak ("data offset outside of string");
88
89 if (dowrite)
90 {
91 /* write: check length and adjust. */
92 if (length < 0 || length + dataoffset > svlen)
93 length = svlen - dataoffset;
94 }
95 else
96 {
97 /* read: grow scalar as necessary */
98 svptr = SvGROW (data, length + dataoffset);
99 }
100
101 if (length < 0)
102 croak ("length must not be negative");
103
104 New (0, req, 1, aio_cb);
105
106 if (!req)
107 croak ("out of memory during aio_req allocation");
108
109 req->type = dowrite ? REQ_WRITE : REQ_READ;
110 req->fd = fd;
111 req->offset = offset;
112 req->length = length;
113 req->data = SvREFCNT_inc (data);
114 req->dataptr = (char *)svptr + dataoffset;
115 req->callback = SvREFCNT_inc (callback);
116
117 send_req (req);
118}
119
120static int
121poll_cb (pTHX)
122{
123 dSP;
124 int count = 0;
125 aio_req req;
126
127 while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
128 {
129 if (req->type == REQ_QUIT)
130 {
131 Safefree (req->thread);
132 started--;
133 }
134 else
135 {
136 int errorno = errno;
137 errno = req->errorno;
138
139 if (req->type == REQ_READ)
140 SvCUR_set (req->data, req->dataoffset
141 + req->result > 0 ? req->result : 0);
142
143 PUSHMARK (SP);
144 XPUSHs (sv_2mortal (newSViv (req->result)));
145 PUTBACK;
146 call_sv (req->callback, G_VOID);
147 SPAGAIN;
148
149 SvREFCNT_dec (req->data);
150 SvREFCNT_dec (req->callback);
151
152 errno = errorno;
153 nreqs--;
154 count++;
155 }
156
157 Safefree (req);
158 }
159
160 return count;
161}
162
163static sigset_t fullsigset;
164
165#undef errno
166#include <asm/unistd.h>
167
168static int
169aio_proc(void *thr_arg)
170{
171 aio_thread *thr = thr_arg;
172 aio_req req;
173 int errno;
174
175 /* we rely on gcc's ability to create closures. */
176 _syscall3(int,lseek,int,fd,off_t,offset,int,whence)
177 _syscall3(int,read,int,fd,char *,buf,off_t,count)
178 _syscall3(int,write,int,fd,char *,buf,off_t,count)
179 _syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
180 _syscall1(int,close,int,fd)
181
182 sigprocmask (SIG_SETMASK, &fullsigset, 0);
183
184 /* then loop */
185 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
186 {
187 req->thread = thr;
188 errno = 0;
189
190 if (req->type == REQ_READ || req->type == REQ_WRITE)
191 {
192 if (lseek (req->fd, req->offset, SEEK_SET) == req->offset)
193 {
194 if (req->type == REQ_READ)
195 req->result = read (req->fd, req->dataptr, req->length);
196 else
197 req->result = write(req->fd, req->dataptr, req->length);
198 }
199 }
200 else if (req->type == REQ_OPEN)
201 {
202 req->result = open (req->dataptr, req->fd, req->mode);
203 }
204 else if (req->type == REQ_CLOSE)
205 {
206 req->result = close (req->fd);
207 }
208 else
209 {
210 write (respipe[1], (void *)&req, sizeof (req));
211 break;
212 }
213
214 req->errorno = errno;
215 write (respipe[1], (void *)&req, sizeof (req));
216 }
217
218 return 0;
53} 219}
54 220
55MODULE = Linux::AIO PACKAGE = Linux::AIO 221MODULE = Linux::AIO PACKAGE = Linux::AIO
56 222
57BOOT: 223BOOT:
58{ 224{
225 sigfillset (&fullsigset);
226 sigdelset (&fullsigset, SIGTERM);
227 sigdelset (&fullsigset, SIGQUIT);
228 sigdelset (&fullsigset, SIGABRT);
229 sigdelset (&fullsigset, SIGINT);
230
59 if (pipe (reqpipe) || pipe (respipe)) 231 if (pipe (reqpipe) || pipe (respipe))
60 croak ("unable to initialize request or result pipe"); 232 croak ("unable to initialize request or result pipe");
233
234 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
235 croak ("cannot set result pipe to nonblocking mode");
61} 236}
62 237
63void 238void
64min_parallel(nthreads) 239min_parallel(nthreads)
65 int nthreads 240 int nthreads
241 PROTOTYPE: $
66 CODE: 242 CODE:
67 while (nthreads > started) 243 while (nthreads > started)
68 start_thread (); 244 start_thread ();
69 245
70void 246void
71max_parallel(nthreads) 247max_parallel(nthreads)
72 int nthreads 248 int nthreads
249 PROTOTYPE: $
73 CODE: 250 CODE:
251 int cur = started;
252 while (cur > nthreads)
253 {
254 end_thread ();
255 cur--;
256 }
257
258 poll_cb ();
74 while (started > nthreads) 259 while (started > nthreads)
75 end_thread (); 260 {
261 sched_yield ();
262 poll_cb ();
263 }
76 264
77void 265void
78read(fh,offset,length,data,dataoffset,callback) 266aio_read(fh,offset,length,data,dataoffset,callback)
267 PerlIO * fh
268 UV offset
269 STRLEN length
270 SV * data
271 STRLEN dataoffset
272 SV * callback
273 PROTOTYPE: $$$$$$
274 ALIAS:
275 aio_write = 1
79 CODE: 276 CODE:
277 SvUPGRADE (data, SVt_PV);
278 SvPOK_on (data);
279 read_write (aTHX_ ix, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
280
281void
282aio_open(pathname,flags,mode,callback)
283 char * pathname
284 int flags
285 int mode
286 SV * callback
287 PROTOTYPE: $$$$
288 CODE:
289 aio_req req;
290
291 New (0, req, 1, aio_cb);
292
293 if (!req)
294 croak ("out of memory during aio_req allocation");
295
296 req->type = REQ_OPEN;
297 req->dataptr = pathname;
298 req->fd = flags;
299 req->mode = mode;
300 req->callback = SvREFCNT_inc (callback);
301
302 send_req (req);
303
304void
305aio_close(fh,callback)
306 PerlIO * fh
307 SV * callback
308 PROTOTYPE: $
309 CODE:
310 aio_req req;
311
312 New (0, req, 1, aio_cb);
313
314 if (!req)
315 croak ("out of memory during aio_req allocation");
316
317 req->type = REQ_CLOSE;
318 req->fd = PerlIO_fileno (fh);
319 req->callback = SvREFCNT_inc (callback);
320
321 send_req (req);
322
323int
324poll_fileno()
325 PROTOTYPE:
326 CODE:
327 RETVAL = respipe[0];
328 OUTPUT:
329 RETVAL
330
331int
332poll_cb(...)
333 PROTOTYPE:
334 CODE:
335 RETVAL = poll_cb (aTHX);
336 OUTPUT:
337 RETVAL
338
339int
340nreqs()
341 PROTOTYPE:
342 CODE:
343 RETVAL = nreqs;
344 OUTPUT:
345 RETVAL
346

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