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Comparing Linux-AIO/AIO.xs (file contents):
Revision 1.4 by root, Tue Aug 14 14:56:22 2001 UTC vs.
Revision 1.29 by root, Sat Jul 9 22:45:06 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 fd_set rfd;
175 FD_ZERO(&rfd);
176 FD_SET(respipe[0], &rfd);
177
178 select (respipe[0] + 1, &rfd, 0, 0, 0);
179}
180
181static int
182poll_cb (pTHX)
183{
184 dSP;
185 int count = 0;
186 aio_req req;
187
188 while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
189 {
190 nreqs--;
191
192 if (req->type == REQ_QUIT)
193 {
194 Safefree (req->thread);
195 started--;
196 }
197 else
198 {
199 int errorno = errno;
200 errno = req->errorno;
201
202 if (req->type == REQ_READ)
203 SvCUR_set (req->data, req->dataoffset
204 + req->result > 0 ? req->result : 0);
205
206 if (req->data)
207 SvREFCNT_dec (req->data);
208
209 if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
210 {
211 PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
212 PL_laststatval = req->result;
213 PL_statcache = *(req->statdata);
214
215 Safefree (req->statdata);
216 }
217
218 PUSHMARK (SP);
219 XPUSHs (sv_2mortal (newSViv (req->result)));
220 PUTBACK;
221 call_sv (req->callback, G_VOID);
222 SPAGAIN;
223
224 if (req->callback)
225 SvREFCNT_dec (req->callback);
226
69 errno = errorno; 227 errno = errorno;
228 count++;
229 }
230
231 Safefree (req);
232 }
233
234 if (qs)
235 send_reqs ();
236
237 return count;
70} 238}
239
240static sigset_t fullsigset;
71 241
72#undef errno 242#undef errno
73#include <asm/unistd.h> 243#include <asm/unistd.h>
244#include <linux/types.h>
245#include <sys/prctl.h>
246
247#if __alpha || __ia64 || __hppa || __v850__
248# define stat kernelstat
249# define stat64 kernelstat64
250# include <asm/stat.h>
251# undef stat
252# undef stat64
253#else
254# define kernelstat stat
255# define kernelstat64 stat64
256#endif
257
258#define COPY_STATDATA \
259 req->statdata->st_dev = statdata.st_dev; \
260 req->statdata->st_ino = statdata.st_ino; \
261 req->statdata->st_mode = statdata.st_mode; \
262 req->statdata->st_nlink = statdata.st_nlink; \
263 req->statdata->st_uid = statdata.st_uid; \
264 req->statdata->st_gid = statdata.st_gid; \
265 req->statdata->st_rdev = statdata.st_rdev; \
266 req->statdata->st_size = statdata.st_size; \
267 req->statdata->st_atime = statdata.st_atime; \
268 req->statdata->st_mtime = statdata.st_mtime; \
269 req->statdata->st_ctime = statdata.st_ctime; \
270 req->statdata->st_blksize = statdata.st_blksize; \
271 req->statdata->st_blocks = statdata.st_blocks; \
74 272
75static int 273static int
76aio_proc(void *thr_arg) 274aio_proc (void *thr_arg)
77{ 275{
78 aio_thread *thr = thr_arg; 276 aio_thread *thr = thr_arg;
79 int sig; 277 aio_req req;
80 int errno; 278 int errno;
81 aio_req req;
82 279
280 /* this is very much kernel-specific :(:(:( */
83 /* we rely on gcc's ability to create closures. */ 281 /* we rely on gcc's ability to create closures. */
84 _syscall3(int,lseek,int,fd,off_t,offset,int,whence); 282 _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); 283 _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);
87 284
88 /* first get rid of any signals */ 285 _syscall3(long, open, char *, pathname, int, flags, int, mode)
89 for (sig = 1; sig < _NSIG; sig++) 286 _syscall1(long, close, unsigned int, fd)
90 signal (sig, SIG_IGN); 287 _syscall1(long, unlink, char *, filename);
288 _syscall1(long, fsync, unsigned int, fd);
289 _syscall1(long, fdatasync, unsigned int, fd);
91 290
92 signal (SIGTERM, SIG_DFL); 291#if BYTE_ORDER == LITTLE_ENDIAN
93 292# define LOFF_ARG(off) (off & 0xffffffff), (off >> 32)
293#elif BYTE_ORDER == BIG_ENDIAN
294# define LOFF_ARG(off) (off >> 32), (off & 0xffffffff)
295#endif
296
297#ifndef __NR_pread64
298# define __NR_pread64 __NR_pread
299# define __NR_pwrite64 __NR_write
300#endif
301 _syscall5(__kernel_ssize_t, pread64 , unsigned int, fd, char *, buf,
302 __kernel_size_t, count, unsigned int, offset_lh, unsigned int, offset_hl)
303 _syscall5(__kernel_ssize_t, pwrite64, unsigned int, fd, char *, buf,
304 __kernel_size_t, count, unsigned int, offset_lh, unsigned int, offset_hl)
305 _syscall4(long, readahead, unsigned int, fd, unsigned int, offset_lh, unsigned int, offset_hl, __kernel_size_t, count);
306
307#if __NR_stat64
308 _syscall2(long, stat64 , const char *, filename, struct kernelstat64 *, buf)
309 _syscall2(long, lstat64, const char *, filename, struct kernelstat64 *, buf)
310 _syscall2(long, fstat64, int , fd , struct kernelstat64 *, buf)
311#elif __NR_stat
312 _syscall2(long, stat , const char *, filename, struct kernelstat *, buf)
313 _syscall2(long, lstat, const char *, filename, struct kernelstat *, buf)
314 _syscall2(long, fstat, int , fd , struct kernelstat *, buf)
315#else
316# error "neither stat64 nor stat defined"
317#endif
318
319 /* the following two calls might clobber errno */
320 sigprocmask (SIG_SETMASK, &fullsigset, 0);
321 prctl (PR_SET_PDEATHSIG, SIGKILL);
322
94 /* then loop */ 323 /* then loop */
95 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) 324 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
96 { 325 {
97 req->thread = thr; 326 req->thread = thr;
327 errno = 0; /* strictly unnecessary */
98 328
99 if (req->type == REQ_READ || req->type == REQ_WRITE) 329 switch (req->type)
100 { 330 {
331 case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, LOFF_ARG (req->offset)); break;
332 case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, LOFF_ARG (req->offset)); break;
333 case REQ_READAHEAD: req->result = readahead (req->fd, LOFF_ARG (req->offset), req->length); break;
334
335#if __NR_stat64
336 struct kernelstat64 statdata;
337 case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break;
338 case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
339 case REQ_FSTAT: req->result = fstat64 (req->fd , &statdata); COPY_STATDATA; break;
340#else
341 struct kernelstat statdata;
342 case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break;
343 case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break;
344 case REQ_FSTAT: req->result = fstat (req->fd , &statdata); COPY_STATDATA; break;
345#endif
346
347 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
348 case REQ_CLOSE: req->result = close (req->fd); break;
349 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
350
351 case REQ_FSYNC: req->result = fsync (req->fd); break;
352 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
353
354 case REQ_QUIT:
355 write (respipe[1], (void *)&req, sizeof (req));
101 errno = 0; 356 return 0;
102 357
103 if (lseek (req->fd, req->offset, SEEK_SET) == req->offset) 358 default:
359 req->result = ENOSYS;
104 { 360 break;
105 if (req->type == REQ_READ)
106 req->result = read (req->fd, req->dataptr, req->length);
107 else
108 req->result = write(req->fd, req->dataptr, req->length);
109 }
110
111 req->errorno = errno;
112 } 361 }
113 else
114 {
115 write (respipe[1], (void *)&req, sizeof (req));
116 break;
117 }
118 362
363 req->errorno = errno;
119 write (respipe[1], (void *)&req, sizeof (req)); 364 write (respipe[1], (void *)&req, sizeof (req));
120 } 365 }
121 366
122 return 0; 367 return 0;
123} 368}
124 369
125MODULE = Linux::AIO PACKAGE = Linux::AIO 370MODULE = Linux::AIO PACKAGE = Linux::AIO
126 371
127BOOT: 372BOOT:
128{ 373{
374 sigfillset (&fullsigset);
375 sigdelset (&fullsigset, SIGTERM);
376 sigdelset (&fullsigset, SIGQUIT);
377 sigdelset (&fullsigset, SIGABRT);
378 sigdelset (&fullsigset, SIGINT);
379
129 if (pipe (reqpipe) || pipe (respipe)) 380 if (pipe (reqpipe) || pipe (respipe))
130 croak ("unable to initialize request or result pipe"); 381 croak ("unable to initialize request or result pipe");
382
383 if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))
384 croak ("cannot set result pipe to nonblocking mode");
385
386 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
387 croak ("cannot set result pipe to nonblocking mode");
131} 388}
132 389
133void 390void
134min_parallel(nthreads) 391min_parallel(nthreads)
135 int nthreads 392 int nthreads
393 PROTOTYPE: $
136 CODE: 394 CODE:
137 while (nthreads > started) 395 while (nthreads > started)
138 start_thread (); 396 start_thread ();
139 397
140void 398void
141max_parallel(nthreads) 399max_parallel(nthreads)
142 int nthreads 400 int nthreads
401 PROTOTYPE: $
143 CODE: 402 CODE:
403 int cur = started;
404 while (cur > nthreads)
405 {
406 end_thread ();
407 cur--;
408 }
409
144 while (started > nthreads) 410 while (started > nthreads)
411 {
412 poll_wait ();
413 poll_cb (aTHX);
414 }
415
416void
417aio_open(pathname,flags,mode,callback)
418 SV * pathname
419 int flags
420 int mode
421 SV * callback
422 PROTOTYPE: $$$$
423 CODE:
424 aio_req req;
425
426 Newz (0, req, 1, aio_cb);
427
428 if (!req)
429 croak ("out of memory during aio_req allocation");
430
431 req->type = REQ_OPEN;
432 req->data = newSVsv (pathname);
433 req->dataptr = SvPV_nolen (req->data);
434 req->fd = flags;
435 req->mode = mode;
436 req->callback = SvREFCNT_inc (callback);
437
145 end_thread (); 438 send_req (req);
146 439
147void 440void
441aio_close(fh,callback)
442 InputStream fh
443 SV * callback
444 PROTOTYPE: $$
445 ALIAS:
446 aio_close = REQ_CLOSE
447 aio_fsync = REQ_FSYNC
448 aio_fdatasync = REQ_FDATASYNC
449 CODE:
450 aio_req req;
451
452 Newz (0, req, 1, aio_cb);
453
454 if (!req)
455 croak ("out of memory during aio_req allocation");
456
457 req->type = ix;
458 req->fd = PerlIO_fileno (fh);
459 req->callback = SvREFCNT_inc (callback);
460
461 send_req (req);
462
463void
148read(fh,offset,length,data,dataoffset,callback) 464aio_read(fh,offset,length,data,dataoffset,callback)
149 ALIAS: 465 InputStream fh
150 write = 1 466 UV offset
467 IV length
468 SV * data
469 IV dataoffset
470 SV * callback
471 PROTOTYPE: $$$$$$
472 CODE:
473 read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
474
475void
476aio_write(fh,offset,length,data,dataoffset,callback)
477 OutputStream fh
478 UV offset
479 IV length
480 SV * data
481 IV dataoffset
482 SV * callback
483 PROTOTYPE: $$$$$$
484 CODE:
485 read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
486
487void
488aio_stat(fh_or_path,callback)
489 SV * fh_or_path
490 SV * callback
491 PROTOTYPE: $$
492 ALIAS:
493 aio_lstat = 1
151 CODE: 494 CODE:
495 aio_req req;
496
497 Newz (0, req, 1, aio_cb);
498
499 if (!req)
500 croak ("out of memory during aio_req allocation");
501
502 New (0, req->statdata, 1, Stat_t);
503
504 if (!req->statdata)
505 croak ("out of memory during aio_req->statdata allocation");
506
507 if (SvPOK (fh_or_path))
508 {
509 req->type = ix ? REQ_LSTAT : REQ_STAT;
510 req->data = newSVsv (fh_or_path);
511 req->dataptr = SvPV_nolen (req->data);
512 }
513 else
514 {
515 req->type = REQ_FSTAT;
516 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
517 }
518
519 req->callback = SvREFCNT_inc (callback);
520
521 send_req (req);
522
523void
524aio_unlink(pathname,callback)
525 SV * pathname
526 SV * callback
527 PROTOTYPE: $$
528 CODE:
529 aio_req req;
530
531 Newz (0, req, 1, aio_cb);
532
533 if (!req)
534 croak ("out of memory during aio_req allocation");
535
536 req->type = REQ_UNLINK;
537 req->data = newSVsv (pathname);
538 req->dataptr = SvPV_nolen (req->data);
539 req->callback = SvREFCNT_inc (callback);
540
541 send_req (req);
542
543int
544poll_fileno()
545 PROTOTYPE:
546 CODE:
547 RETVAL = respipe[0];
548 OUTPUT:
549 RETVAL
550
551int
552poll_cb(...)
553 PROTOTYPE:
554 CODE:
555 RETVAL = poll_cb (aTHX);
556 OUTPUT:
557 RETVAL
558
559void
560poll_wait()
561 PROTOTYPE:
562 CODE:
563 poll_wait ();
564
565int
566nreqs()
567 PROTOTYPE:
568 CODE:
569 RETVAL = nreqs;
570 OUTPUT:
571 RETVAL
572

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