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Comparing Linux-AIO/AIO.xs (file contents):
Revision 1.2 by root, Tue Aug 14 04:32:19 2001 UTC vs.
Revision 1.32 by root, Tue Jul 12 10:51:09 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_QUIT 0 19#if __i386 || __amd64
12#define REQ_READ 1 20# define STACKSIZE ( 256 * sizeof (long))
13#define REQ_WRITE 2 21#elif __ia64
22# define STACKSIZE (8192 * sizeof (long))
23#else
24# define STACKSIZE ( 512 * sizeof (long))
25#endif
26
27enum {
28 REQ_QUIT,
29 REQ_OPEN, REQ_CLOSE,
30 REQ_READ, REQ_WRITE, REQ_READAHEAD,
31 REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
32 REQ_FSYNC, REQ_FDATASYNC,
33};
14 34
15typedef struct { 35typedef struct {
16 char stack[STACKSIZE]; 36 char stack[STACKSIZE];
17} aio_thread; 37} aio_thread;
18 38
19typedef struct { 39typedef struct aio_cb {
40 struct aio_cb *next;
41
20 int type; 42 int type;
21 aio_thread *thread; 43 aio_thread *thread;
22 44
23/* read/write */
24 int fd; 45 int fd;
25 off_t offset; 46 off_t offset;
26 size_t length; 47 size_t length;
27 ssize_t result; 48 ssize_t result;
49 mode_t mode; /* open */
28 int errorno; 50 int errorno;
29 51 SV *data, *callback;
30 SV *data;
31 void *dataptr; 52 void *dataptr;
32 STRLEN dataoffset; 53 STRLEN dataoffset;
54
55 Stat_t *statdata;
33} aio_cb; 56} aio_cb;
34 57
35typedef aio_cb *aio_req; 58typedef aio_cb *aio_req;
36 59
37static int started; 60static int started;
61static int nreqs;
38static int reqpipe[2], respipe[2]; 62static int reqpipe[2], respipe[2];
39 63
64static aio_req qs, qe; /* queue start, queue end */
65
40static int aio_proc(void *arg); 66static int aio_proc(void *arg);
41 67
42static void 68static void
43start_thread(void) 69start_thread (void)
44{ 70{
45 aio_thread *thr; 71 aio_thread *thr;
46 72
47 New (0, thr, 1, aio_thread); 73 New (0, thr, 1, aio_thread);
48 74
49 if (clone (aio_proc, 75 if (clone (aio_proc,
50 &(thr->stack[STACKSIZE]), 76 &(thr->stack[STACKSIZE - 16]),
51 CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND, 77 CLONE_VM|CLONE_FS|CLONE_FILES,
52 thr) >= 0) 78 thr) >= 0)
53 started++; 79 started++;
54 else 80 else
55 Safefree (thr); 81 Safefree (thr);
56} 82}
57 83
58static void 84static void
59end_thread(void) 85send_reqs (void)
60{ 86{
61 aio_req req = 0; 87 /* this write is atomic */
62 write (reqpipe[1], &req, sizeof (aio_req)); 88 while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
63 started--; 89 {
90 qs = qs->next;
91 if (!qs) qe = 0;
92 }
64} 93}
65 94
66static void 95static void
67set_errno(int errorno) 96send_req (aio_req req)
68{ 97{
98 nreqs++;
99 req->next = 0;
100
101 if (qe)
102 {
103 qe->next = req;
104 qe = req;
105 }
106 else
107 qe = qs = req;
108
109 send_reqs ();
110}
111
112static void
113end_thread (void)
114{
115 aio_req req;
116 New (0, req, 1, aio_cb);
117 req->type = REQ_QUIT;
118
119 send_req (req);
120}
121
122static void
123read_write (pTHX_
124 int dowrite, int fd, off_t offset, size_t length,
125 SV *data, STRLEN dataoffset, SV *callback)
126{
127 aio_req req;
128 STRLEN svlen;
129 char *svptr = SvPV (data, svlen);
130
131 SvUPGRADE (data, SVt_PV);
132 SvPOK_on (data);
133
134 if (dataoffset < 0)
135 dataoffset += svlen;
136
137 if (dataoffset < 0 || dataoffset > svlen)
138 croak ("data offset outside of string");
139
140 if (dowrite)
141 {
142 /* write: check length and adjust. */
143 if (length < 0 || length + dataoffset > svlen)
144 length = svlen - dataoffset;
145 }
146 else
147 {
148 /* read: grow scalar as necessary */
149 svptr = SvGROW (data, length + dataoffset);
150 }
151
152 if (length < 0)
153 croak ("length must not be negative");
154
155 Newz (0, req, 1, aio_cb);
156
157 if (!req)
158 croak ("out of memory during aio_req allocation");
159
160 req->type = dowrite ? REQ_WRITE : REQ_READ;
161 req->fd = fd;
162 req->offset = offset;
163 req->length = length;
164 req->data = SvREFCNT_inc (data);
165 req->dataptr = (char *)svptr + dataoffset;
166 req->callback = SvREFCNT_inc (callback);
167
168 send_req (req);
169}
170
171static void
172poll_wait ()
173{
174 if (!nreqs)
175 return;
176
177 fd_set rfd;
178 FD_ZERO(&rfd);
179 FD_SET(respipe[0], &rfd);
180
181 select (respipe[0] + 1, &rfd, 0, 0, 0);
182}
183
184static int
185poll_cb (pTHX)
186{
187 dSP;
188 int count = 0;
189 aio_req req;
190
191 while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
192 {
193 nreqs--;
194
195 if (req->type == REQ_QUIT)
196 {
197 Safefree (req->thread);
198 started--;
199 }
200 else
201 {
202 int errorno = errno;
203 errno = req->errorno;
204
205 if (req->type == REQ_READ)
206 SvCUR_set (req->data, req->dataoffset
207 + req->result > 0 ? req->result : 0);
208
209 if (req->data)
210 SvREFCNT_dec (req->data);
211
212 if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
213 {
214 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
215 PL_laststatval = req->result;
216 PL_statcache = *(req->statdata);
217
218 Safefree (req->statdata);
219 }
220
221 PUSHMARK (SP);
222 XPUSHs (sv_2mortal (newSViv (req->result)));
223 PUTBACK;
224 call_sv (req->callback, G_VOID);
225 SPAGAIN;
226
227 if (req->callback)
228 SvREFCNT_dec (req->callback);
229
69 errno = errorno; 230 errno = errorno;
231 count++;
232 }
233
234 Safefree (req);
235 }
236
237 if (qs)
238 send_reqs ();
239
240 return count;
70} 241}
242
243static sigset_t fullsigset;
71 244
72#undef errno 245#undef errno
246#include <linux/unistd.h>
247#include <linux/types.h>
248#include <sys/prctl.h>
249
250#if __alpha || __ia64 || __hppa || __v850__
251# define stat kernelstat
252# define stat64 kernelstat64
73#include <asm/unistd.h> 253# include <asm/stat.h>
254# undef stat
255# undef stat64
256#else
257# define kernelstat stat
258# define kernelstat64 stat64
259#endif
260
261#define COPY_STATDATA \
262 req->statdata->st_dev = statdata.st_dev; \
263 req->statdata->st_ino = statdata.st_ino; \
264 req->statdata->st_mode = statdata.st_mode; \
265 req->statdata->st_nlink = statdata.st_nlink; \
266 req->statdata->st_uid = statdata.st_uid; \
267 req->statdata->st_gid = statdata.st_gid; \
268 req->statdata->st_rdev = statdata.st_rdev; \
269 req->statdata->st_size = statdata.st_size; \
270 req->statdata->st_atime = statdata.st_atime; \
271 req->statdata->st_mtime = statdata.st_mtime; \
272 req->statdata->st_ctime = statdata.st_ctime; \
273 req->statdata->st_blksize = statdata.st_blksize; \
274 req->statdata->st_blocks = statdata.st_blocks; \
74 275
75static int 276static int
76aio_proc(void *thr_arg) 277aio_proc (void *thr_arg)
77{ 278{
78 aio_thread *thr = thr_arg; 279 aio_thread *thr = thr_arg;
79 int sig; 280 aio_req req;
80 int errno; 281 int errno;
81 aio_req req;
82 282
283 /* this is very much kernel-specific :(:(:( */
83 /* we rely on gcc's ability to create closures. */ 284 /* we rely on gcc's ability to create closures. */
84 _syscall3(int,lseek,int,fd,off_t,offset,int,whence); 285 _syscall3(__kernel_size_t, read , unsigned int, fd, char *, buf, __kernel_size_t, count)
85 _syscall3(int,read,int,fd,char *,buf,off_t,count); 286 _syscall3(__kernel_size_t, write, unsigned int, fd, char *, buf, __kernel_size_t, count)
86 _syscall3(int,write,int,fd,char *,buf,off_t,count);
87 287
88 /* first get rid of any signals */ 288 _syscall3(long, open, char *, pathname, int, flags, int, mode)
89 for (sig = 1; sig < _NSIG; sig++) 289 _syscall1(long, close, unsigned int, fd)
90 if (sig != SIGTERM) 290 _syscall1(long, unlink, char *, filename);
91 signal (sig, SIG_IGN); 291 _syscall1(long, fsync, unsigned int, fd);
92 292
293#ifndef __NR_fdatasync
294# define __NR_fdatasync __NR_fsync
295#endif
296 _syscall1(long, fdatasync, unsigned int, fd);
297
298#if BYTE_ORDER == LITTLE_ENDIAN
299# define LOFF_ARG(off) (off & 0xffffffff), (off >> 32)
300#elif BYTE_ORDER == BIG_ENDIAN
301# define LOFF_ARG(off) (off >> 32), (off & 0xffffffff)
302#endif
303
304#ifndef __NR_pread64
305# define __NR_pread64 __NR_pread
306# define __NR_pwrite64 __NR_write
307#endif
308 _syscall5(__kernel_ssize_t, pread64 , unsigned int, fd, char *, buf,
309 __kernel_size_t, count, unsigned int, offset_lh, unsigned int, offset_hl)
310 _syscall5(__kernel_ssize_t, pwrite64, unsigned int, fd, char *, buf,
311 __kernel_size_t, count, unsigned int, offset_lh, unsigned int, offset_hl)
312 _syscall4(long, readahead, unsigned int, fd, unsigned int, offset_lh, unsigned int, offset_hl, __kernel_size_t, count);
313
314#if __NR_stat64
315 _syscall2(long, stat64 , const char *, filename, struct kernelstat64 *, buf)
316 _syscall2(long, lstat64, const char *, filename, struct kernelstat64 *, buf)
317 _syscall2(long, fstat64, int , fd , struct kernelstat64 *, buf)
318#elif __NR_stat
319 _syscall2(long, stat , const char *, filename, struct kernelstat *, buf)
320 _syscall2(long, lstat, const char *, filename, struct kernelstat *, buf)
321 _syscall2(long, fstat, int , fd , struct kernelstat *, buf)
322#else
323# error "neither stat64 nor stat defined"
324#endif
325
326 /* the following two calls might clobber errno */
327 sigprocmask (SIG_SETMASK, &fullsigset, 0);
328 prctl (PR_SET_PDEATHSIG, SIGKILL);
329
93 /* then loop */ 330 /* then loop */
94 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) 331 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
95 { 332 {
96 req->thread = thr; 333 req->thread = thr;
334 errno = 0; /* strictly unnecessary */
97 335
98 if (req->type == REQ_READ || req->type == REQ_WRITE) 336 switch (req->type)
99 { 337 {
338 case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, LOFF_ARG (req->offset)); break;
339 case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, LOFF_ARG (req->offset)); break;
340 case REQ_READAHEAD: req->result = readahead (req->fd, LOFF_ARG (req->offset), req->length); break;
341
342#if __NR_stat64
343 struct kernelstat64 statdata;
344 case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break;
345 case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
346 case REQ_FSTAT: req->result = fstat64 (req->fd , &statdata); COPY_STATDATA; break;
347#else
348 struct kernelstat statdata;
349 case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break;
350 case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break;
351 case REQ_FSTAT: req->result = fstat (req->fd , &statdata); COPY_STATDATA; break;
352#endif
353
354 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
355 case REQ_CLOSE: req->result = close (req->fd); break;
356 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
357
358 case REQ_FSYNC: req->result = fsync (req->fd); break;
359 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
360
361 case REQ_QUIT:
362 write (respipe[1], (void *)&req, sizeof (req));
100 errno = 0; 363 return 0;
101 364
102 if (lseek (req->fd, req->offset, SEEK_SET) == req->offset) 365 default:
366 req->result = ENOSYS;
103 { 367 break;
104 if (req->type == REQ_READ)
105 req->result = read (req->fd, req->dataptr, req->length);
106 else
107 req->result = write(req->fd, req->dataptr, req->length);
108 }
109
110 req->errorno = errno;
111 } 368 }
112 else
113 {
114 write (respipe[1], (void *)&req, sizeof (req));
115 break;
116 }
117 369
370 req->errorno = errno;
118 write (respipe[1], (void *)&req, sizeof (req)); 371 write (respipe[1], (void *)&req, sizeof (req));
119 } 372 }
120 373
121 return 0; 374 return 0;
122} 375}
123 376
124MODULE = Linux::AIO PACKAGE = Linux::AIO 377MODULE = Linux::AIO PACKAGE = Linux::AIO
125 378
126BOOT: 379BOOT:
127{ 380{
381 sigfillset (&fullsigset);
382 sigdelset (&fullsigset, SIGTERM);
383 sigdelset (&fullsigset, SIGQUIT);
384 sigdelset (&fullsigset, SIGABRT);
385 sigdelset (&fullsigset, SIGINT);
386
128 if (pipe (reqpipe) || pipe (respipe)) 387 if (pipe (reqpipe) || pipe (respipe))
129 croak ("unable to initialize request or result pipe"); 388 croak ("unable to initialize request or result pipe");
389
390 if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))
391 croak ("cannot set result pipe to nonblocking mode");
392
393 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
394 croak ("cannot set result pipe to nonblocking mode");
130} 395}
131 396
132void 397void
133min_parallel(nthreads) 398min_parallel(nthreads)
134 int nthreads 399 int nthreads
400 PROTOTYPE: $
135 CODE: 401 CODE:
136 while (nthreads > started) 402 while (nthreads > started)
137 start_thread (); 403 start_thread ();
138 404
139void 405void
140max_parallel(nthreads) 406max_parallel(nthreads)
141 int nthreads 407 int nthreads
408 PROTOTYPE: $
142 CODE: 409 CODE:
410{
411 int cur = started;
412 while (cur > nthreads)
413 {
414 end_thread ();
415 cur--;
416 }
417
143 while (started > nthreads) 418 while (started > nthreads)
419 {
420 poll_wait ();
421 poll_cb (aTHX);
422 }
423}
424
425void
426aio_open(pathname,flags,mode,callback)
427 SV * pathname
428 int flags
429 int mode
430 SV * callback
431 PROTOTYPE: $$$$
432 CODE:
433{
434 aio_req req;
435
436 Newz (0, req, 1, aio_cb);
437
438 if (!req)
439 croak ("out of memory during aio_req allocation");
440
441 req->type = REQ_OPEN;
442 req->data = newSVsv (pathname);
443 req->dataptr = SvPV_nolen (req->data);
444 req->fd = flags;
445 req->mode = mode;
446 req->callback = SvREFCNT_inc (callback);
447
144 end_thread (); 448 send_req (req);
449}
145 450
146void 451void
452aio_close(fh,callback)
453 InputStream fh
454 SV * callback
455 PROTOTYPE: $$
456 ALIAS:
457 aio_close = REQ_CLOSE
458 aio_fsync = REQ_FSYNC
459 aio_fdatasync = REQ_FDATASYNC
460 CODE:
461{
462 aio_req req;
463
464 Newz (0, req, 1, aio_cb);
465
466 if (!req)
467 croak ("out of memory during aio_req allocation");
468
469 req->type = ix;
470 req->fd = PerlIO_fileno (fh);
471 req->callback = SvREFCNT_inc (callback);
472
473 send_req (req);
474}
475
476void
147read(fh,offset,length,data,dataoffset,callback) 477aio_read(fh,offset,length,data,dataoffset,callback)
478 InputStream fh
479 UV offset
480 IV length
481 SV * data
482 IV dataoffset
483 SV * callback
484 PROTOTYPE: $$$$$$
485 CODE:
486 read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
487
488void
489aio_write(fh,offset,length,data,dataoffset,callback)
490 OutputStream fh
491 UV offset
492 IV length
493 SV * data
494 IV dataoffset
495 SV * callback
496 PROTOTYPE: $$$$$$
497 CODE:
498 read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
499
500void
501aio_readahead(fh,offset,length,callback)
502 InputStream fh
503 UV offset
504 IV length
505 SV * callback
506 PROTOTYPE: $$$$
507 CODE:
508{
509 aio_req req;
510
511 if (length < 0)
512 croak ("length must not be negative");
513
514 Newz (0, req, 1, aio_cb);
515
516 if (!req)
517 croak ("out of memory during aio_req allocation");
518
519 req->type = REQ_READAHEAD;
520 req->fd = PerlIO_fileno (fh);
521 req->offset = offset;
522 req->length = length;
523 req->callback = SvREFCNT_inc (callback);
524
525 send_req (req);
526}
527
528void
529aio_stat(fh_or_path,callback)
530 SV * fh_or_path
531 SV * callback
532 PROTOTYPE: $$
533 ALIAS:
534 aio_lstat = 1
148 CODE: 535 CODE:
536{
537 aio_req req;
538
539 Newz (0, req, 1, aio_cb);
540
541 if (!req)
542 croak ("out of memory during aio_req allocation");
543
544 New (0, req->statdata, 1, Stat_t);
545
546 if (!req->statdata)
547 croak ("out of memory during aio_req->statdata allocation");
548
549 if (SvPOK (fh_or_path))
550 {
551 req->type = ix ? REQ_LSTAT : REQ_STAT;
552 req->data = newSVsv (fh_or_path);
553 req->dataptr = SvPV_nolen (req->data);
554 }
555 else
556 {
557 req->type = REQ_FSTAT;
558 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
559 }
560
561 req->callback = SvREFCNT_inc (callback);
562
563 send_req (req);
564}
565
566void
567aio_unlink(pathname,callback)
568 SV * pathname
569 SV * callback
570 PROTOTYPE: $$
571 CODE:
572{
573 aio_req req;
574
575 Newz (0, req, 1, aio_cb);
576
577 if (!req)
578 croak ("out of memory during aio_req allocation");
579
580 req->type = REQ_UNLINK;
581 req->data = newSVsv (pathname);
582 req->dataptr = SvPV_nolen (req->data);
583 req->callback = SvREFCNT_inc (callback);
584
585 send_req (req);
586}
587
588int
589poll_fileno()
590 PROTOTYPE:
591 CODE:
592 RETVAL = respipe[0];
593 OUTPUT:
594 RETVAL
595
596int
597poll_cb(...)
598 PROTOTYPE:
599 CODE:
600 RETVAL = poll_cb (aTHX);
601 OUTPUT:
602 RETVAL
603
604void
605poll_wait()
606 PROTOTYPE:
607 CODE:
608 poll_wait ();
609
610int
611nreqs()
612 PROTOTYPE:
613 CODE:
614 RETVAL = nreqs;
615 OUTPUT:
616 RETVAL
617

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