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

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