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Comparing Linux-AIO/AIO.xs (file contents):
Revision 1.12 by root, Tue Dec 25 02:33:48 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>
7#include <fcntl.h> 10#include <fcntl.h>
8#include <signal.h> 11#include <signal.h>
9#include <sched.h> 12#include <sched.h>
13#include <endian.h>
10 14
15typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */
16typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
11typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ 17typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
12 18
13#define STACKSIZE 1024 /* yeah */ 19#if __i386 || __amd64
20# define STACKSIZE ( 256 * sizeof (long))
21#elif __ia64
22# define STACKSIZE (8192 * sizeof (long))
23#else
24# define STACKSIZE ( 512 * sizeof (long))
25#endif
14 26
15enum { REQ_QUIT, REQ_READ, REQ_WRITE, REQ_OPEN, REQ_CLOSE }; 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};
16 34
17typedef struct { 35typedef struct {
18 char stack[STACKSIZE]; 36 char stack[STACKSIZE];
19} aio_thread; 37} aio_thread;
20 38
21typedef struct { 39typedef struct aio_cb {
40 struct aio_cb *next;
41
22 int type; 42 int type;
23 aio_thread *thread; 43 aio_thread *thread;
24 44
25/* read/write */
26 int fd; 45 int fd;
27 off_t offset; 46 off_t offset;
28 size_t length; 47 size_t length;
29 ssize_t result; 48 ssize_t result;
30 mode_t mode; /* open */ 49 mode_t mode; /* open */
31 int errorno; 50 int errorno;
32 SV *data, *callback; 51 SV *data, *callback;
33 void *dataptr; 52 void *dataptr;
34 STRLEN dataoffset; 53 STRLEN dataoffset;
54
55 Stat_t *statdata;
35} aio_cb; 56} aio_cb;
36 57
37typedef aio_cb *aio_req; 58typedef aio_cb *aio_req;
38 59
39static int started; 60static int started;
40static int nreqs; 61static int nreqs;
41static int reqpipe[2], respipe[2]; 62static int reqpipe[2], respipe[2];
42 63
64static aio_req qs, qe; /* queue start, queue end */
65
43static int aio_proc(void *arg); 66static int aio_proc(void *arg);
44 67
45static void 68static void
46start_thread(void) 69start_thread (void)
47{ 70{
48 aio_thread *thr; 71 aio_thread *thr;
49 72
50 New (0, thr, 1, aio_thread); 73 New (0, thr, 1, aio_thread);
51 74
52 if (clone (aio_proc, 75 if (clone (aio_proc,
53 &(thr->stack[STACKSIZE]), 76 &(thr->stack[STACKSIZE - 16]),
54 CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND, 77 CLONE_VM|CLONE_FS|CLONE_FILES,
55 thr) >= 0) 78 thr) >= 0)
56 started++; 79 started++;
57 else 80 else
58 Safefree (thr); 81 Safefree (thr);
59} 82}
60 83
61static void 84static void
85send_reqs (void)
86{
87 /* this write is atomic */
88 while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
89 {
90 qs = qs->next;
91 if (!qs) qe = 0;
92 }
93}
94
95static void
96send_req (aio_req req)
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
62end_thread(void) 113end_thread (void)
63{ 114{
64 aio_req req; 115 aio_req req;
65 New (0, req, 1, aio_cb); 116 New (0, req, 1, aio_cb);
66 req->type = REQ_QUIT; 117 req->type = REQ_QUIT;
67 write (reqpipe[1], &req, sizeof (aio_req)); 118
119 send_req (req);
68} 120}
69 121
70static void 122static void
71send_req (aio_req req) 123read_write (pTHX_
72{
73 nreqs++;
74 write (reqpipe[1], &req, sizeof (aio_req));
75}
76
77static void
78read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length, 124 int dowrite, int fd, off_t offset, size_t length,
79 SV *data, STRLEN dataoffset, SV*callback) 125 SV *data, STRLEN dataoffset, SV *callback)
80{ 126{
81 aio_req req; 127 aio_req req;
82 STRLEN svlen; 128 STRLEN svlen;
83 char *svptr = SvPV (data, svlen); 129 char *svptr = SvPV (data, svlen);
130
131 SvUPGRADE (data, SVt_PV);
132 SvPOK_on (data);
84 133
85 if (dataoffset < 0) 134 if (dataoffset < 0)
86 dataoffset += svlen; 135 dataoffset += svlen;
87 136
88 if (dataoffset < 0 || dataoffset > svlen) 137 if (dataoffset < 0 || dataoffset > svlen)
… …
101 } 150 }
102 151
103 if (length < 0) 152 if (length < 0)
104 croak ("length must not be negative"); 153 croak ("length must not be negative");
105 154
106 New (0, req, 1, aio_cb); 155 Newz (0, req, 1, aio_cb);
107 156
108 if (!req) 157 if (!req)
109 croak ("out of memory during aio_req allocation"); 158 croak ("out of memory during aio_req allocation");
110 159
111 req->type = dowrite ? REQ_WRITE : REQ_READ; 160 req->type = dowrite ? REQ_WRITE : REQ_READ;
… …
117 req->callback = SvREFCNT_inc (callback); 166 req->callback = SvREFCNT_inc (callback);
118 167
119 send_req (req); 168 send_req (req);
120} 169}
121 170
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
122static int 181static int
123poll_cb (pTHX) 182poll_cb (pTHX)
124{ 183{
125 dSP; 184 dSP;
126 int count = 0; 185 int count = 0;
127 aio_req req; 186 aio_req req;
128 187
129 while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req)) 188 while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
130 { 189 {
190 nreqs--;
191
131 if (req->type == REQ_QUIT) 192 if (req->type == REQ_QUIT)
132 { 193 {
133 Safefree (req->thread); 194 Safefree (req->thread);
134 started--; 195 started--;
135 } 196 }
… …
140 201
141 if (req->type == REQ_READ) 202 if (req->type == REQ_READ)
142 SvCUR_set (req->data, req->dataoffset 203 SvCUR_set (req->data, req->dataoffset
143 + req->result > 0 ? req->result : 0); 204 + req->result > 0 ? req->result : 0);
144 205
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
145 PUSHMARK (SP); 218 PUSHMARK (SP);
146 XPUSHs (sv_2mortal (newSViv (req->result))); 219 XPUSHs (sv_2mortal (newSViv (req->result)));
147 PUTBACK; 220 PUTBACK;
148 call_sv (req->callback, G_VOID); 221 call_sv (req->callback, G_VOID);
149 SPAGAIN; 222 SPAGAIN;
150 223
151 SvREFCNT_dec (req->data); 224 if (req->callback)
152 SvREFCNT_dec (req->callback); 225 SvREFCNT_dec (req->callback);
153 226
154 errno = errorno; 227 errno = errorno;
155 nreqs--;
156 count++; 228 count++;
157 } 229 }
158 230
159 Safefree (req); 231 Safefree (req);
160 } 232 }
161 233
234 if (qs)
235 send_reqs ();
236
162 return count; 237 return count;
163} 238}
164 239
165static sigset_t fullsigset; 240static sigset_t fullsigset;
166 241
167#undef errno 242#undef errno
168#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; \
169 272
170static int 273static int
171aio_proc(void *thr_arg) 274aio_proc (void *thr_arg)
172{ 275{
173 aio_thread *thr = thr_arg; 276 aio_thread *thr = thr_arg;
174 aio_req req; 277 aio_req req;
175 int errno; 278 int errno;
176 279
280 /* this is very much kernel-specific :(:(:( */
177 /* we rely on gcc's ability to create closures. */ 281 /* we rely on gcc's ability to create closures. */
178 _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)
179 _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)
180 _syscall3(int,write,int,fd,char *,buf,off_t,count) 284
181 _syscall3(int,open,char *,pathname,int,flags,mode_t,mode) 285 _syscall3(long, open, char *, pathname, int, flags, int, mode)
182 _syscall1(int,close,int,fd) 286 _syscall1(long, close, unsigned int, fd)
287 _syscall1(long, unlink, char *, filename);
288 _syscall1(long, fsync, unsigned int, fd);
289 _syscall1(long, fdatasync, unsigned int, fd);
183 290
291#if BYTE_ORDER == LITTLE_ENDIAN
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 */
184 sigprocmask (SIG_SETMASK, &fullsigset, 0); 320 sigprocmask (SIG_SETMASK, &fullsigset, 0);
321 prctl (PR_SET_PDEATHSIG, SIGKILL);
185 322
186 /* then loop */ 323 /* then loop */
187 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) 324 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
188 { 325 {
189 req->thread = thr; 326 req->thread = thr;
190 errno = 0; 327 errno = 0; /* strictly unnecessary */
191 328
192 if (req->type == REQ_READ || req->type == REQ_WRITE) 329 switch (req->type)
193 { 330 {
194 if (lseek (req->fd, req->offset, SEEK_SET) == req->offset) 331 case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, LOFF_ARG (req->offset)); break;
195 { 332 case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, LOFF_ARG (req->offset)); break;
196 if (req->type == REQ_READ) 333 case REQ_READAHEAD: req->result = readahead (req->fd, LOFF_ARG (req->offset), req->length); break;
197 req->result = read (req->fd, req->dataptr, req->length); 334
198 else 335#if __NR_stat64
199 req->result = write(req->fd, req->dataptr, req->length); 336 struct kernelstat64 statdata;
200 } 337 case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break;
201 } 338 case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
202 else if (req->type == REQ_OPEN) 339 case REQ_FSTAT: req->result = fstat64 (req->fd , &statdata); COPY_STATDATA; break;
203 { 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
204 req->result = open (req->dataptr, req->fd, req->mode); 347 case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
205 } 348 case REQ_CLOSE: req->result = close (req->fd); break;
206 else if (req->type == REQ_CLOSE) 349 case REQ_UNLINK: req->result = unlink (req->dataptr); break;
207 { 350
208 req->result = close (req->fd); 351 case REQ_FSYNC: req->result = fsync (req->fd); break;
209 } 352 case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
210 else 353
211 { 354 case REQ_QUIT:
212 write (respipe[1], (void *)&req, sizeof (req)); 355 write (respipe[1], (void *)&req, sizeof (req));
356 return 0;
357
358 default:
359 req->result = ENOSYS;
213 break; 360 break;
214 } 361 }
215 362
216 req->errorno = errno; 363 req->errorno = errno;
217 write (respipe[1], (void *)&req, sizeof (req)); 364 write (respipe[1], (void *)&req, sizeof (req));
218 } 365 }
… …
230 sigdelset (&fullsigset, SIGABRT); 377 sigdelset (&fullsigset, SIGABRT);
231 sigdelset (&fullsigset, SIGINT); 378 sigdelset (&fullsigset, SIGINT);
232 379
233 if (pipe (reqpipe) || pipe (respipe)) 380 if (pipe (reqpipe) || pipe (respipe))
234 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");
235 385
236 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK)) 386 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
237 croak ("cannot set result pipe to nonblocking mode"); 387 croak ("cannot set result pipe to nonblocking mode");
238} 388}
239 389
… …
255 { 405 {
256 end_thread (); 406 end_thread ();
257 cur--; 407 cur--;
258 } 408 }
259 409
260 poll_cb ();
261 while (started > nthreads) 410 while (started > nthreads)
262 { 411 {
263 sched_yield (); 412 poll_wait ();
264 fcntl (respipe[0], F_SETFL, 0);
265 poll_cb (); 413 poll_cb (aTHX);
266 fcntl (respipe[0], F_SETFL, O_NONBLOCK);
267 } 414 }
268 415
269void 416void
417aio_open(pathname,flags,mode,callback)
418 SV * pathname
419 int flags
420 int mode
421 SV * callback
422 PROTOTYPE: $$$$
423 CODE:
424 aio_req req;
425
426 Newz (0, req, 1, aio_cb);
427
428 if (!req)
429 croak ("out of memory during aio_req allocation");
430
431 req->type = REQ_OPEN;
432 req->data = newSVsv (pathname);
433 req->dataptr = SvPV_nolen (req->data);
434 req->fd = flags;
435 req->mode = mode;
436 req->callback = SvREFCNT_inc (callback);
437
438 send_req (req);
439
440void
441aio_close(fh,callback)
442 InputStream fh
443 SV * callback
444 PROTOTYPE: $$
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
270aio_read(fh,offset,length,data,dataoffset,callback) 464aio_read(fh,offset,length,data,dataoffset,callback)
271 InOutStream fh 465 InputStream fh
272 UV offset 466 UV offset
273 IV length 467 IV length
274 SV * data 468 SV * data
275 IV dataoffset 469 IV dataoffset
276 SV * callback 470 SV * callback
277 PROTOTYPE: $$$$$$ 471 PROTOTYPE: $$$$$$
278 ALIAS: 472 CODE:
279 aio_write = 1
280 CODE:
281 SvUPGRADE (data, SVt_PV);
282 SvPOK_on (data);
283 read_write (aTHX_ ix, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); 473 read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
284 474
285void 475void
286aio_open(pathname,flags,mode,callback) 476aio_write(fh,offset,length,data,dataoffset,callback)
287 char * pathname 477 OutputStream fh
288 int flags 478 UV offset
289 int mode 479 IV length
480 SV * data
481 IV dataoffset
290 SV * callback 482 SV * callback
291 PROTOTYPE: $$$$ 483 PROTOTYPE: $$$$$$
484 CODE:
485 read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
486
487void
488aio_stat(fh_or_path,callback)
489 SV * fh_or_path
490 SV * callback
491 PROTOTYPE: $$
492 ALIAS:
493 aio_lstat = 1
292 CODE: 494 CODE:
293 aio_req req; 495 aio_req req;
294 496
295 New (0, req, 1, aio_cb); 497 Newz (0, req, 1, aio_cb);
296 498
297 if (!req) 499 if (!req)
298 croak ("out of memory during aio_req allocation"); 500 croak ("out of memory during aio_req allocation");
299 501
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 {
300 req->type = REQ_OPEN; 515 req->type = REQ_FSTAT;
301 req->dataptr = pathname; 516 req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
302 req->fd = flags; 517 }
303 req->mode = mode; 518
304 req->callback = SvREFCNT_inc (callback); 519 req->callback = SvREFCNT_inc (callback);
305 520
306 send_req (req); 521 send_req (req);
307 522
308void 523void
309aio_close(fh,callback) 524aio_unlink(pathname,callback)
310 InOutStream fh 525 SV * pathname
311 SV * callback 526 SV * callback
312 PROTOTYPE: $ 527 PROTOTYPE: $$
313 CODE: 528 CODE:
314 aio_req req; 529 aio_req req;
315 530
316 New (0, req, 1, aio_cb); 531 Newz (0, req, 1, aio_cb);
317 532
318 if (!req) 533 if (!req)
319 croak ("out of memory during aio_req allocation"); 534 croak ("out of memory during aio_req allocation");
320 535
321 req->type = REQ_CLOSE; 536 req->type = REQ_UNLINK;
322 req->fd = PerlIO_fileno (fh); 537 req->data = newSVsv (pathname);
538 req->dataptr = SvPV_nolen (req->data);
323 req->callback = SvREFCNT_inc (callback); 539 req->callback = SvREFCNT_inc (callback);
324 540
325 send_req (req); 541 send_req (req);
326 542
327int 543int
328poll_fileno() 544poll_fileno()
329 PROTOTYPE: 545 PROTOTYPE:
330 CODE: 546 CODE:
… …
338 CODE: 554 CODE:
339 RETVAL = poll_cb (aTHX); 555 RETVAL = poll_cb (aTHX);
340 OUTPUT: 556 OUTPUT:
341 RETVAL 557 RETVAL
342 558
559void
560poll_wait()
561 PROTOTYPE:
562 CODE:
563 poll_wait ();
564
343int 565int
344nreqs() 566nreqs()
345 PROTOTYPE: 567 PROTOTYPE:
346 CODE: 568 CODE:
347 RETVAL = nreqs; 569 RETVAL = nreqs;

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