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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 1.26 by root, Thu Jul 7 23:17:23 2005 UTC

1#define PERL_NO_GET_CONTEXT
2
1#include "EXTERN.h" 3#include "EXTERN.h"
2#include "perl.h" 4#include "perl.h"
3#include "XSUB.h" 5#include "XSUB.h"
4 6
5#include <sys/types.h> 7#include <sys/types.h>
8#include <sys/stat.h>
6#include <unistd.h> 9#include <unistd.h>
10#include <fcntl.h>
11#include <signal.h>
7#include <sched.h> 12#include <sched.h>
13#include <endian.h>
8 14
9#define STACKSIZE 128 /* yeah */ 15typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */
16typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
17typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
10 18
11#define REQ_EXIT 0 19// 128 seems to be enough most everywhere. alpha needs 256.
12#define REQ_READ 1 20#define STACKSIZE (256 * sizeof (long))
13#define REQ_WRITE 2 21
22enum {
23 REQ_QUIT,
24 REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE,
25 REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK
26};
14 27
15typedef struct { 28typedef struct {
16 char stack[STACKSIZE]; 29 char stack[STACKSIZE];
17} aio_thread; 30} aio_thread;
18 31
19typedef struct { 32typedef struct aio_cb {
33 struct aio_cb *next;
34
20 int type; 35 int type;
21 aio_thread *thread; 36 aio_thread *thread;
22 37
23/* read/write */
24 int fd; 38 int fd;
25 off_t offset; 39 off_t offset;
26 size_t length; 40 size_t length;
27 ssize_t done; 41 ssize_t result;
42 mode_t mode; /* open */
28 int errorno; 43 int errorno;
29 44 SV *data, *callback;
30 SV *data;
31 void *dataptr; 45 void *dataptr;
32 STRLEN offset; 46 STRLEN dataoffset;
47
48 Stat_t *statdata;
33} aio_cb; 49} aio_cb;
34 50
35typedef aio_cb *aio_req; 51typedef aio_cb *aio_req;
36 52
37static int started; 53static int started;
54static int nreqs;
38static int reqpipe[2], respipe[2]; 55static int reqpipe[2], respipe[2];
39 56
57static aio_req qs, qe; /* queue start, queue end */
58
59static int aio_proc(void *arg);
60
40static void 61static void
41start_thread(void) 62start_thread (void)
42{ 63{
43 aio_thread *thr = NEW ( 64 aio_thread *thr;
65
66 New (0, thr, 1, aio_thread);
67
44 __clone (aio_proc, 68 if (clone (aio_proc,
69 &(thr->stack[STACKSIZE - sizeof (long)]),
70 CLONE_VM|CLONE_FS|CLONE_FILES,
71 thr) >= 0)
72 started++;
73 else
74 Safefree (thr);
45} 75}
46 76
47static void 77static void
78send_reqs (void)
79{
80 /* this write is atomic */
81 while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
82 {
83 qs = qs->next;
84 if (!qs) qe = 0;
85 }
86}
87
88static void
89send_req (aio_req req)
90{
91 nreqs++;
92 req->next = 0;
93
94 if (qe)
95 {
96 qe->next = req;
97 qe = req;
98 }
99 else
100 qe = qs = req;
101
102 send_reqs ();
103}
104
105static void
48end_thread(void) 106end_thread (void)
49{ 107{
50 aio_req req = 0; 108 aio_req req;
109 New (0, req, 1, aio_cb);
110 req->type = REQ_QUIT;
111
112 send_req (req);
113}
114
115static void
116read_write (pTHX_
117 int dowrite, int fd, off_t offset, size_t length,
118 SV *data, STRLEN dataoffset, SV *callback)
119{
120 aio_req req;
121 STRLEN svlen;
122 char *svptr = SvPV (data, svlen);
123
124 SvUPGRADE (data, SVt_PV);
125 SvPOK_on (data);
126
127 if (dataoffset < 0)
128 dataoffset += svlen;
129
130 if (dataoffset < 0 || dataoffset > svlen)
131 croak ("data offset outside of string");
132
133 if (dowrite)
134 {
135 /* write: check length and adjust. */
136 if (length < 0 || length + dataoffset > svlen)
137 length = svlen - dataoffset;
138 }
139 else
140 {
141 /* read: grow scalar as necessary */
142 svptr = SvGROW (data, length + dataoffset);
143 }
144
145 if (length < 0)
146 croak ("length must not be negative");
147
148 Newz (0, req, 1, aio_cb);
149
150 if (!req)
151 croak ("out of memory during aio_req allocation");
152
153 req->type = dowrite ? REQ_WRITE : REQ_READ;
154 req->fd = fd;
155 req->offset = offset;
156 req->length = length;
157 req->data = SvREFCNT_inc (data);
158 req->dataptr = (char *)svptr + dataoffset;
159 req->callback = SvREFCNT_inc (callback);
160
161 send_req (req);
162}
163
164static void
165poll_wait ()
166{
167 fd_set rfd;
168 FD_ZERO(&rfd);
169 FD_SET(respipe[0], &rfd);
170
171 select (respipe[0] + 1, &rfd, 0, 0, 0);
172}
173
174static int
175poll_cb (pTHX)
176{
177 dSP;
178 int count = 0;
179 aio_req req;
180
181 while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
182 {
183 nreqs--;
184
185 if (req->type == REQ_QUIT)
186 {
187 Safefree (req->thread);
188 started--;
189 }
190 else
191 {
192 int errorno = errno;
193 errno = req->errorno;
194
195 if (req->type == REQ_READ)
196 SvCUR_set (req->data, req->dataoffset
197 + req->result > 0 ? req->result : 0);
198
199 if (req->data)
200 SvREFCNT_dec (req->data);
201
202 if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
203 {
204 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
205 PL_laststatval = req->result;
206 PL_statcache = *(req->statdata);
207
208 Safefree (req->statdata);
209 }
210
211 PUSHMARK (SP);
212 XPUSHs (sv_2mortal (newSViv (req->result)));
213 PUTBACK;
214 call_sv (req->callback, G_VOID);
215 SPAGAIN;
216
217 if (req->callback)
218 SvREFCNT_dec (req->callback);
219
220 errno = errorno;
221 count++;
222 }
223
224 Safefree (req);
225 }
226
227 if (qs)
228 send_reqs ();
229
230 return count;
231}
232
233static sigset_t fullsigset;
234
235#undef errno
236#include <asm/unistd.h>
237#include <sys/prctl.h>
238
239#if BYTE_ORDER == LITTLE_ENDIAN
240# define LONG_LONG_PAIR(HI, LO) LO, HI
241#elif BYTE_ORDER == BIG_ENDIAN
242# define LONG_LONG_PAIR(HI, LO) HI, LO
243#endif
244
245#if __alpha || __ia64 || __hppa || __v850__
246# define stat kernelstat
247# define stat64 kernelstat64
248# include <asm/stat.h>
249# undef stat
250# undef stat64
251#else
252# define kernelstat stat
253# define kernelstat64 stat64
254#endif
255
256#define COPY_STATDATA \
257 req->statdata->st_dev = statdata.st_dev; \
258 req->statdata->st_ino = statdata.st_ino; \
259 req->statdata->st_mode = statdata.st_mode; \
260 req->statdata->st_nlink = statdata.st_nlink; \
261 req->statdata->st_uid = statdata.st_uid; \
262 req->statdata->st_gid = statdata.st_gid; \
263 req->statdata->st_rdev = statdata.st_rdev; \
264 req->statdata->st_size = statdata.st_size; \
265 req->statdata->st_atime = statdata.st_atime; \
266 req->statdata->st_mtime = statdata.st_mtime; \
267 req->statdata->st_ctime = statdata.st_ctime; \
268 req->statdata->st_blksize = statdata.st_blksize; \
269 req->statdata->st_blocks = statdata.st_blocks; \
270
271static int
272aio_proc (void *thr_arg)
273{
274 aio_thread *thr = thr_arg;
275 aio_req req;
276 int errno;
277
278 /* this is very much kernel-specific :(:(:( */
279 /* we rely on gcc's ability to create closures. */
280 _syscall3(int,read,int,fd,char *,buf,size_t,count)
281 _syscall3(int,write,int,fd,char *,buf,size_t,count)
282
283 _syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
284 _syscall1(int,close,int,fd)
285
286#if __NR_pread64
287 _syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lh,unsigned int,offset_hl)
288 _syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lh,unsigned int,offset_hl)
289#elif __NR_pread
290 _syscall4(int,pread,int,fd,char *,buf,size_t,count,offset_t,offset)
291 _syscall4(int,pwrite,int,fd,char *,buf,size_t,count,offset_t,offset)
292#else
293# error "neither pread nor pread64 defined"
294#endif
295
296
297#if __NR_stat64
298 _syscall2(int,stat64, const char *, filename, struct kernelstat64 *, buf)
299 _syscall2(int,lstat64, const char *, filename, struct kernelstat64 *, buf)
300 _syscall2(int,fstat64, int, fd, struct kernelstat64 *, buf)
301#elif __NR_stat
302 _syscall2(int,stat, const char *, filename, struct kernelstat *, buf)
303 _syscall2(int,lstat, const char *, filename, struct kernelstat *, buf)
304 _syscall2(int,fstat, int, fd, struct kernelstat *, buf)
305#else
306# error "neither stat64 nor stat defined"
307#endif
308
309 _syscall1(int,unlink, char *, filename);
310
311 sigprocmask (SIG_SETMASK, &fullsigset, 0);
312 prctl (PR_SET_PDEATHSIG, SIGKILL);
313
314 /* then loop */
315 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
316 {
317 req->thread = thr;
318 errno = 0; /* strictly unnecessary */
319
320 switch (req->type)
321 {
322#if __NR_pread64
323 case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length,
324 LONG_LONG_PAIR (req->offset >> 32, req->offset & 0xffffffff)); break;
325 case REQ_WRITE: req->result = pwrite64(req->fd, req->dataptr, req->length,
326 LONG_LONG_PAIR (req->offset >> 32, req->offset & 0xffffffff)); break;
327#else
328 case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
329 case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
330#endif
331#if __NR_stat64
332 struct kernelstat64 statdata;
333 case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break;
334 case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
335 case REQ_FSTAT: req->result = fstat64 (req->fd, &statdata); COPY_STATDATA; break;
336#else
337 struct kernelstat statdata;
338 case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break;
339 case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break;
340 case REQ_FSTAT: req->result = fstat (req->fd, &statdata); COPY_STATDATA; break;
341#endif
342 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
343 case REQ_CLOSE: req->result = close (req->fd); break;
344 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
345
346 case REQ_QUIT:
347 default:
348 write (respipe[1], (void *)&req, sizeof (req));
349 return 0;
350 }
351
352 req->errorno = errno;
51 write (reqpipe[1], &req, sizeof (aio_req)); 353 write (respipe[1], (void *)&req, sizeof (req));
52 nthreads--; 354 }
355
356 return 0;
53} 357}
54 358
55MODULE = Linux::AIO PACKAGE = Linux::AIO 359MODULE = Linux::AIO PACKAGE = Linux::AIO
56 360
57BOOT: 361BOOT:
58{ 362{
363 sigfillset (&fullsigset);
364 sigdelset (&fullsigset, SIGTERM);
365 sigdelset (&fullsigset, SIGQUIT);
366 sigdelset (&fullsigset, SIGABRT);
367 sigdelset (&fullsigset, SIGINT);
368
59 if (pipe (reqpipe) || pipe (respipe)) 369 if (pipe (reqpipe) || pipe (respipe))
60 croak ("unable to initialize request or result pipe"); 370 croak ("unable to initialize request or result pipe");
371
372 if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))
373 croak ("cannot set result pipe to nonblocking mode");
374
375 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
376 croak ("cannot set result pipe to nonblocking mode");
61} 377}
62 378
63void 379void
64min_parallel(nthreads) 380min_parallel(nthreads)
65 int nthreads 381 int nthreads
382 PROTOTYPE: $
66 CODE: 383 CODE:
67 while (nthreads > started) 384 while (nthreads > started)
68 start_thread (); 385 start_thread ();
69 386
70void 387void
71max_parallel(nthreads) 388max_parallel(nthreads)
72 int nthreads 389 int nthreads
390 PROTOTYPE: $
73 CODE: 391 CODE:
392 int cur = started;
393 while (cur > nthreads)
394 {
395 end_thread ();
396 cur--;
397 }
398
74 while (started > nthreads) 399 while (started > nthreads)
400 {
401 poll_wait ();
402 poll_cb (aTHX);
403 }
404
405void
406aio_open(pathname,flags,mode,callback)
407 SV * pathname
408 int flags
409 int mode
410 SV * callback
411 PROTOTYPE: $$$$
412 CODE:
413 aio_req req;
414
415 Newz (0, req, 1, aio_cb);
416
417 if (!req)
418 croak ("out of memory during aio_req allocation");
419
420 req->type = REQ_OPEN;
421 req->data = newSVsv (pathname);
422 req->dataptr = SvPV_nolen (req->data);
423 req->fd = flags;
424 req->mode = mode;
425 req->callback = SvREFCNT_inc (callback);
426
75 end_thread (); 427 send_req (req);
76 428
77void 429void
430aio_close(fh,callback)
431 InputStream fh
432 SV * callback
433 PROTOTYPE: $$
434 CODE:
435 aio_req req;
436
437 Newz (0, req, 1, aio_cb);
438
439 if (!req)
440 croak ("out of memory during aio_req allocation");
441
442 req->type = REQ_CLOSE;
443 req->fd = PerlIO_fileno (fh);
444 req->callback = SvREFCNT_inc (callback);
445
446 send_req (req);
447
448void
78read(fh,offset,length,data,dataoffset,callback) 449aio_read(fh,offset,length,data,dataoffset,callback)
450 InputStream fh
451 UV offset
452 IV length
453 SV * data
454 IV dataoffset
455 SV * callback
456 PROTOTYPE: $$$$$$
457 CODE:
458 read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
459
460void
461aio_write(fh,offset,length,data,dataoffset,callback)
462 OutputStream fh
463 UV offset
464 IV length
465 SV * data
466 IV dataoffset
467 SV * callback
468 PROTOTYPE: $$$$$$
469 CODE:
470 read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
471
472void
473aio_stat(fh_or_path,callback)
474 SV * fh_or_path
475 SV * callback
476 PROTOTYPE: $$
477 ALIAS:
478 aio_lstat = 1
79 CODE: 479 CODE:
480 aio_req req;
481
482 Newz (0, req, 1, aio_cb);
483
484 if (!req)
485 croak ("out of memory during aio_req allocation");
486
487 New (0, req->statdata, 1, Stat_t);
488
489 if (!req->statdata)
490 croak ("out of memory during aio_req->statdata allocation");
491
492 if (SvPOK (fh_or_path))
493 {
494 req->type = ix ? REQ_LSTAT : REQ_STAT;
495 req->data = newSVsv (fh_or_path);
496 req->dataptr = SvPV_nolen (req->data);
497 }
498 else
499 {
500 req->type = REQ_FSTAT;
501 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
502 }
503
504 req->callback = SvREFCNT_inc (callback);
505
506 send_req (req);
507
508void
509aio_unlink(pathname,callback)
510 SV * pathname
511 SV * callback
512 PROTOTYPE: $$
513 CODE:
514 aio_req req;
515
516 Newz (0, req, 1, aio_cb);
517
518 if (!req)
519 croak ("out of memory during aio_req allocation");
520
521 req->type = REQ_UNLINK;
522 req->data = newSVsv (pathname);
523 req->dataptr = SvPV_nolen (req->data);
524 req->callback = SvREFCNT_inc (callback);
525
526 send_req (req);
527
528int
529poll_fileno()
530 PROTOTYPE:
531 CODE:
532 RETVAL = respipe[0];
533 OUTPUT:
534 RETVAL
535
536int
537poll_cb(...)
538 PROTOTYPE:
539 CODE:
540 RETVAL = poll_cb (aTHX);
541 OUTPUT:
542 RETVAL
543
544void
545poll_wait()
546 PROTOTYPE:
547 CODE:
548 poll_wait ();
549
550int
551nreqs()
552 PROTOTYPE:
553 CODE:
554 RETVAL = nreqs;
555 OUTPUT:
556 RETVAL
557

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