| 1 |
#include "EXTERN.h" |
| 2 |
#include "perl.h" |
| 3 |
#include "XSUB.h" |
| 4 |
|
| 5 |
#define _XOPEN_SOURCE 500 |
| 6 |
|
| 7 |
#include <sys/types.h> |
| 8 |
#include <sys/stat.h> |
| 9 |
|
| 10 |
#include <unistd.h> |
| 11 |
#include <fcntl.h> |
| 12 |
#include <signal.h> |
| 13 |
#include <sched.h> |
| 14 |
#if __linux |
| 15 |
#include <sys/syscall.h> |
| 16 |
#endif |
| 17 |
|
| 18 |
#include <pthread.h> |
| 19 |
|
| 20 |
typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
| 21 |
typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
| 22 |
typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */ |
| 23 |
|
| 24 |
#if __ia64 |
| 25 |
# define STACKSIZE 65536 |
| 26 |
#else |
| 27 |
# define STACKSIZE 4096 |
| 28 |
#endif |
| 29 |
|
| 30 |
enum { |
| 31 |
REQ_QUIT, |
| 32 |
REQ_OPEN, REQ_CLOSE, |
| 33 |
REQ_READ, REQ_WRITE, REQ_READAHEAD, |
| 34 |
REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK, |
| 35 |
REQ_FSYNC, REQ_FDATASYNC, |
| 36 |
}; |
| 37 |
|
| 38 |
typedef struct aio_cb { |
| 39 |
struct aio_cb *volatile next; |
| 40 |
|
| 41 |
int type; |
| 42 |
|
| 43 |
int fd; |
| 44 |
off_t offset; |
| 45 |
size_t length; |
| 46 |
ssize_t result; |
| 47 |
mode_t mode; /* open */ |
| 48 |
int errorno; |
| 49 |
SV *data, *callback; |
| 50 |
void *dataptr; |
| 51 |
STRLEN dataoffset; |
| 52 |
|
| 53 |
Stat_t *statdata; |
| 54 |
} aio_cb; |
| 55 |
|
| 56 |
typedef aio_cb *aio_req; |
| 57 |
|
| 58 |
static int started; |
| 59 |
static int nreqs; |
| 60 |
static int max_outstanding = 1<<30; |
| 61 |
static int respipe [2]; |
| 62 |
|
| 63 |
static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER; |
| 64 |
static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER; |
| 65 |
static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER; |
| 66 |
|
| 67 |
static volatile aio_req reqs, reqe; /* queue start, queue end */ |
| 68 |
static volatile aio_req ress, rese; /* queue start, queue end */ |
| 69 |
|
| 70 |
static void |
| 71 |
poll_wait () |
| 72 |
{ |
| 73 |
if (!nreqs) |
| 74 |
return; |
| 75 |
|
| 76 |
fd_set rfd; |
| 77 |
FD_ZERO(&rfd); |
| 78 |
FD_SET(respipe [0], &rfd); |
| 79 |
|
| 80 |
select (respipe [0] + 1, &rfd, 0, 0, 0); |
| 81 |
} |
| 82 |
|
| 83 |
static int |
| 84 |
poll_cb () |
| 85 |
{ |
| 86 |
dSP; |
| 87 |
int count = 0; |
| 88 |
aio_req req; |
| 89 |
|
| 90 |
{ |
| 91 |
/* read and signals sent by the worker threads */ |
| 92 |
char buf [32]; |
| 93 |
while (read (respipe [0], buf, 32) > 0) |
| 94 |
; |
| 95 |
} |
| 96 |
|
| 97 |
for (;;) |
| 98 |
{ |
| 99 |
pthread_mutex_lock (&reslock); |
| 100 |
|
| 101 |
req = ress; |
| 102 |
|
| 103 |
if (ress) |
| 104 |
{ |
| 105 |
ress = ress->next; |
| 106 |
if (!ress) rese = 0; |
| 107 |
} |
| 108 |
|
| 109 |
pthread_mutex_unlock (&reslock); |
| 110 |
|
| 111 |
if (!req) |
| 112 |
break; |
| 113 |
|
| 114 |
nreqs--; |
| 115 |
|
| 116 |
if (req->type == REQ_QUIT) |
| 117 |
started--; |
| 118 |
else |
| 119 |
{ |
| 120 |
int errorno = errno; |
| 121 |
errno = req->errorno; |
| 122 |
|
| 123 |
if (req->type == REQ_READ) |
| 124 |
SvCUR_set (req->data, req->dataoffset |
| 125 |
+ req->result > 0 ? req->result : 0); |
| 126 |
|
| 127 |
if (req->data) |
| 128 |
SvREFCNT_dec (req->data); |
| 129 |
|
| 130 |
if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT) |
| 131 |
{ |
| 132 |
PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT; |
| 133 |
PL_laststatval = req->result; |
| 134 |
PL_statcache = *(req->statdata); |
| 135 |
|
| 136 |
Safefree (req->statdata); |
| 137 |
} |
| 138 |
|
| 139 |
PUSHMARK (SP); |
| 140 |
XPUSHs (sv_2mortal (newSViv (req->result))); |
| 141 |
|
| 142 |
if (req->type == REQ_OPEN) |
| 143 |
{ |
| 144 |
/* convert fd to fh */ |
| 145 |
SV *fh; |
| 146 |
|
| 147 |
PUTBACK; |
| 148 |
call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL); |
| 149 |
SPAGAIN; |
| 150 |
|
| 151 |
fh = POPs; |
| 152 |
|
| 153 |
PUSHMARK (SP); |
| 154 |
XPUSHs (fh); |
| 155 |
} |
| 156 |
|
| 157 |
if (SvOK (req->callback)) |
| 158 |
{ |
| 159 |
PUTBACK; |
| 160 |
call_sv (req->callback, G_VOID | G_EVAL); |
| 161 |
SPAGAIN; |
| 162 |
} |
| 163 |
|
| 164 |
if (req->callback) |
| 165 |
SvREFCNT_dec (req->callback); |
| 166 |
|
| 167 |
errno = errorno; |
| 168 |
count++; |
| 169 |
} |
| 170 |
|
| 171 |
Safefree (req); |
| 172 |
} |
| 173 |
|
| 174 |
return count; |
| 175 |
} |
| 176 |
|
| 177 |
static void *aio_proc(void *arg); |
| 178 |
|
| 179 |
static void |
| 180 |
start_thread (void) |
| 181 |
{ |
| 182 |
sigset_t fullsigset, oldsigset; |
| 183 |
pthread_t tid; |
| 184 |
pthread_attr_t attr; |
| 185 |
|
| 186 |
pthread_attr_init (&attr); |
| 187 |
pthread_attr_setstacksize (&attr, STACKSIZE); |
| 188 |
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
| 189 |
|
| 190 |
sigfillset (&fullsigset); |
| 191 |
sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset); |
| 192 |
|
| 193 |
if (pthread_create (&tid, &attr, aio_proc, 0) == 0) |
| 194 |
started++; |
| 195 |
|
| 196 |
sigprocmask (SIG_SETMASK, &oldsigset, 0); |
| 197 |
} |
| 198 |
|
| 199 |
static void |
| 200 |
send_req (aio_req req) |
| 201 |
{ |
| 202 |
nreqs++; |
| 203 |
|
| 204 |
pthread_mutex_lock (&reqlock); |
| 205 |
|
| 206 |
req->next = 0; |
| 207 |
|
| 208 |
if (reqe) |
| 209 |
{ |
| 210 |
reqe->next = req; |
| 211 |
reqe = req; |
| 212 |
} |
| 213 |
else |
| 214 |
reqe = reqs = req; |
| 215 |
|
| 216 |
pthread_cond_signal (&reqwait); |
| 217 |
pthread_mutex_unlock (&reqlock); |
| 218 |
|
| 219 |
while (nreqs > max_outstanding) |
| 220 |
{ |
| 221 |
poll_wait (); |
| 222 |
poll_cb (); |
| 223 |
} |
| 224 |
} |
| 225 |
|
| 226 |
static void |
| 227 |
end_thread (void) |
| 228 |
{ |
| 229 |
aio_req req; |
| 230 |
New (0, req, 1, aio_cb); |
| 231 |
req->type = REQ_QUIT; |
| 232 |
|
| 233 |
send_req (req); |
| 234 |
} |
| 235 |
|
| 236 |
static void |
| 237 |
read_write (int dowrite, int fd, off_t offset, size_t length, |
| 238 |
SV *data, STRLEN dataoffset, SV *callback) |
| 239 |
{ |
| 240 |
aio_req req; |
| 241 |
STRLEN svlen; |
| 242 |
char *svptr = SvPV (data, svlen); |
| 243 |
|
| 244 |
SvUPGRADE (data, SVt_PV); |
| 245 |
SvPOK_on (data); |
| 246 |
|
| 247 |
if (dataoffset < 0) |
| 248 |
dataoffset += svlen; |
| 249 |
|
| 250 |
if (dataoffset < 0 || dataoffset > svlen) |
| 251 |
croak ("data offset outside of string"); |
| 252 |
|
| 253 |
if (dowrite) |
| 254 |
{ |
| 255 |
/* write: check length and adjust. */ |
| 256 |
if (length < 0 || length + dataoffset > svlen) |
| 257 |
length = svlen - dataoffset; |
| 258 |
} |
| 259 |
else |
| 260 |
{ |
| 261 |
/* read: grow scalar as necessary */ |
| 262 |
svptr = SvGROW (data, length + dataoffset); |
| 263 |
} |
| 264 |
|
| 265 |
if (length < 0) |
| 266 |
croak ("length must not be negative"); |
| 267 |
|
| 268 |
Newz (0, req, 1, aio_cb); |
| 269 |
|
| 270 |
if (!req) |
| 271 |
croak ("out of memory during aio_req allocation"); |
| 272 |
|
| 273 |
req->type = dowrite ? REQ_WRITE : REQ_READ; |
| 274 |
req->fd = fd; |
| 275 |
req->offset = offset; |
| 276 |
req->length = length; |
| 277 |
req->data = SvREFCNT_inc (data); |
| 278 |
req->dataptr = (char *)svptr + dataoffset; |
| 279 |
req->callback = SvREFCNT_inc (callback); |
| 280 |
|
| 281 |
send_req (req); |
| 282 |
} |
| 283 |
|
| 284 |
static void * |
| 285 |
aio_proc (void *thr_arg) |
| 286 |
{ |
| 287 |
aio_req req; |
| 288 |
int type; |
| 289 |
|
| 290 |
do |
| 291 |
{ |
| 292 |
pthread_mutex_lock (&reqlock); |
| 293 |
|
| 294 |
for (;;) |
| 295 |
{ |
| 296 |
req = reqs; |
| 297 |
|
| 298 |
if (reqs) |
| 299 |
{ |
| 300 |
reqs = reqs->next; |
| 301 |
if (!reqs) reqe = 0; |
| 302 |
} |
| 303 |
|
| 304 |
if (req) |
| 305 |
break; |
| 306 |
|
| 307 |
pthread_cond_wait (&reqwait, &reqlock); |
| 308 |
} |
| 309 |
|
| 310 |
pthread_mutex_unlock (&reqlock); |
| 311 |
|
| 312 |
errno = 0; /* strictly unnecessary */ |
| 313 |
|
| 314 |
type = req->type; |
| 315 |
|
| 316 |
switch (type) |
| 317 |
{ |
| 318 |
case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break; |
| 319 |
case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break; |
| 320 |
#if SYS_readahead |
| 321 |
case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break; |
| 322 |
#else |
| 323 |
case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break; |
| 324 |
#endif |
| 325 |
|
| 326 |
case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break; |
| 327 |
case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break; |
| 328 |
case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break; |
| 329 |
|
| 330 |
case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break; |
| 331 |
case REQ_CLOSE: req->result = close (req->fd); break; |
| 332 |
case REQ_UNLINK: req->result = unlink (req->dataptr); break; |
| 333 |
|
| 334 |
case REQ_FSYNC: req->result = fsync (req->fd); break; |
| 335 |
case REQ_FDATASYNC: req->result = fdatasync (req->fd); break; |
| 336 |
|
| 337 |
case REQ_QUIT: |
| 338 |
break; |
| 339 |
|
| 340 |
default: |
| 341 |
req->result = ENOSYS; |
| 342 |
break; |
| 343 |
} |
| 344 |
|
| 345 |
req->errorno = errno; |
| 346 |
|
| 347 |
pthread_mutex_lock (&reslock); |
| 348 |
|
| 349 |
req->next = 0; |
| 350 |
|
| 351 |
if (rese) |
| 352 |
{ |
| 353 |
rese->next = req; |
| 354 |
rese = req; |
| 355 |
} |
| 356 |
else |
| 357 |
{ |
| 358 |
rese = ress = req; |
| 359 |
|
| 360 |
/* write a dummy byte to the pipe so fh becomes ready */ |
| 361 |
write (respipe [1], &respipe, 1); |
| 362 |
} |
| 363 |
|
| 364 |
pthread_mutex_unlock (&reslock); |
| 365 |
} |
| 366 |
while (type != REQ_QUIT); |
| 367 |
|
| 368 |
return 0; |
| 369 |
} |
| 370 |
|
| 371 |
MODULE = IO::AIO PACKAGE = IO::AIO |
| 372 |
|
| 373 |
PROTOTYPES: ENABLE |
| 374 |
|
| 375 |
BOOT: |
| 376 |
{ |
| 377 |
if (pipe (respipe)) |
| 378 |
croak ("unable to initialize result pipe"); |
| 379 |
|
| 380 |
if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)) |
| 381 |
croak ("cannot set result pipe to nonblocking mode"); |
| 382 |
|
| 383 |
if (fcntl (respipe [1], F_SETFL, O_NONBLOCK)) |
| 384 |
croak ("cannot set result pipe to nonblocking mode"); |
| 385 |
} |
| 386 |
|
| 387 |
void |
| 388 |
min_parallel(nthreads) |
| 389 |
int nthreads |
| 390 |
PROTOTYPE: $ |
| 391 |
CODE: |
| 392 |
while (nthreads > started) |
| 393 |
start_thread (); |
| 394 |
|
| 395 |
void |
| 396 |
max_parallel(nthreads) |
| 397 |
int nthreads |
| 398 |
PROTOTYPE: $ |
| 399 |
CODE: |
| 400 |
{ |
| 401 |
int cur = started; |
| 402 |
while (cur > nthreads) |
| 403 |
{ |
| 404 |
end_thread (); |
| 405 |
cur--; |
| 406 |
} |
| 407 |
|
| 408 |
while (started > nthreads) |
| 409 |
{ |
| 410 |
poll_wait (); |
| 411 |
poll_cb (); |
| 412 |
} |
| 413 |
} |
| 414 |
|
| 415 |
int |
| 416 |
max_outstanding(nreqs) |
| 417 |
int nreqs |
| 418 |
PROTOTYPE: $ |
| 419 |
CODE: |
| 420 |
RETVAL = max_outstanding; |
| 421 |
max_outstanding = nreqs; |
| 422 |
|
| 423 |
void |
| 424 |
aio_open(pathname,flags,mode,callback=&PL_sv_undef) |
| 425 |
SV * pathname |
| 426 |
int flags |
| 427 |
int mode |
| 428 |
SV * callback |
| 429 |
PROTOTYPE: $$$;$ |
| 430 |
CODE: |
| 431 |
{ |
| 432 |
aio_req req; |
| 433 |
|
| 434 |
Newz (0, req, 1, aio_cb); |
| 435 |
|
| 436 |
if (!req) |
| 437 |
croak ("out of memory during aio_req allocation"); |
| 438 |
|
| 439 |
req->type = REQ_OPEN; |
| 440 |
req->data = newSVsv (pathname); |
| 441 |
req->dataptr = SvPV_nolen (req->data); |
| 442 |
req->fd = flags; |
| 443 |
req->mode = mode; |
| 444 |
req->callback = SvREFCNT_inc (callback); |
| 445 |
|
| 446 |
send_req (req); |
| 447 |
} |
| 448 |
|
| 449 |
void |
| 450 |
aio_close(fh,callback=&PL_sv_undef) |
| 451 |
InputStream fh |
| 452 |
SV * callback |
| 453 |
PROTOTYPE: $;$ |
| 454 |
ALIAS: |
| 455 |
aio_close = REQ_CLOSE |
| 456 |
aio_fsync = REQ_FSYNC |
| 457 |
aio_fdatasync = REQ_FDATASYNC |
| 458 |
CODE: |
| 459 |
{ |
| 460 |
aio_req req; |
| 461 |
|
| 462 |
Newz (0, req, 1, aio_cb); |
| 463 |
|
| 464 |
if (!req) |
| 465 |
croak ("out of memory during aio_req allocation"); |
| 466 |
|
| 467 |
req->type = ix; |
| 468 |
req->fd = PerlIO_fileno (fh); |
| 469 |
req->callback = SvREFCNT_inc (callback); |
| 470 |
|
| 471 |
send_req (req); |
| 472 |
} |
| 473 |
|
| 474 |
void |
| 475 |
aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
| 476 |
InputStream fh |
| 477 |
UV offset |
| 478 |
IV length |
| 479 |
SV * data |
| 480 |
IV dataoffset |
| 481 |
SV * callback |
| 482 |
PROTOTYPE: $$$$$;$ |
| 483 |
CODE: |
| 484 |
read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
| 485 |
|
| 486 |
void |
| 487 |
aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef) |
| 488 |
OutputStream fh |
| 489 |
UV offset |
| 490 |
IV length |
| 491 |
SV * data |
| 492 |
IV dataoffset |
| 493 |
SV * callback |
| 494 |
PROTOTYPE: $$$$$;$ |
| 495 |
CODE: |
| 496 |
read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback); |
| 497 |
|
| 498 |
void |
| 499 |
aio_readahead(fh,offset,length,callback=&PL_sv_undef) |
| 500 |
InputStream fh |
| 501 |
UV offset |
| 502 |
IV length |
| 503 |
SV * callback |
| 504 |
PROTOTYPE: $$$;$ |
| 505 |
CODE: |
| 506 |
{ |
| 507 |
aio_req req; |
| 508 |
|
| 509 |
if (length < 0) |
| 510 |
croak ("length must not be negative"); |
| 511 |
|
| 512 |
Newz (0, req, 1, aio_cb); |
| 513 |
|
| 514 |
if (!req) |
| 515 |
croak ("out of memory during aio_req allocation"); |
| 516 |
|
| 517 |
req->type = REQ_READAHEAD; |
| 518 |
req->fd = PerlIO_fileno (fh); |
| 519 |
req->offset = offset; |
| 520 |
req->length = length; |
| 521 |
req->callback = SvREFCNT_inc (callback); |
| 522 |
|
| 523 |
send_req (req); |
| 524 |
} |
| 525 |
|
| 526 |
void |
| 527 |
aio_stat(fh_or_path,callback=&PL_sv_undef) |
| 528 |
SV * fh_or_path |
| 529 |
SV * callback |
| 530 |
ALIAS: |
| 531 |
aio_stat = REQ_STAT |
| 532 |
aio_lstat = REQ_LSTAT |
| 533 |
CODE: |
| 534 |
{ |
| 535 |
aio_req req; |
| 536 |
|
| 537 |
Newz (0, req, 1, aio_cb); |
| 538 |
|
| 539 |
if (!req) |
| 540 |
croak ("out of memory during aio_req allocation"); |
| 541 |
|
| 542 |
New (0, req->statdata, 1, Stat_t); |
| 543 |
|
| 544 |
if (!req->statdata) |
| 545 |
croak ("out of memory during aio_req->statdata allocation"); |
| 546 |
|
| 547 |
if (SvPOK (fh_or_path)) |
| 548 |
{ |
| 549 |
req->type = ix; |
| 550 |
req->data = newSVsv (fh_or_path); |
| 551 |
req->dataptr = SvPV_nolen (req->data); |
| 552 |
} |
| 553 |
else |
| 554 |
{ |
| 555 |
req->type = REQ_FSTAT; |
| 556 |
req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path))); |
| 557 |
} |
| 558 |
|
| 559 |
req->callback = SvREFCNT_inc (callback); |
| 560 |
|
| 561 |
send_req (req); |
| 562 |
} |
| 563 |
|
| 564 |
void |
| 565 |
aio_unlink(pathname,callback=&PL_sv_undef) |
| 566 |
SV * pathname |
| 567 |
SV * callback |
| 568 |
CODE: |
| 569 |
{ |
| 570 |
aio_req req; |
| 571 |
|
| 572 |
Newz (0, req, 1, aio_cb); |
| 573 |
|
| 574 |
if (!req) |
| 575 |
croak ("out of memory during aio_req allocation"); |
| 576 |
|
| 577 |
req->type = REQ_UNLINK; |
| 578 |
req->data = newSVsv (pathname); |
| 579 |
req->dataptr = SvPV_nolen (req->data); |
| 580 |
req->callback = SvREFCNT_inc (callback); |
| 581 |
|
| 582 |
send_req (req); |
| 583 |
} |
| 584 |
|
| 585 |
void |
| 586 |
flush() |
| 587 |
PROTOTYPE: |
| 588 |
CODE: |
| 589 |
while (nreqs) |
| 590 |
{ |
| 591 |
poll_wait (); |
| 592 |
poll_cb (); |
| 593 |
} |
| 594 |
|
| 595 |
void |
| 596 |
poll() |
| 597 |
PROTOTYPE: |
| 598 |
CODE: |
| 599 |
if (nreqs) |
| 600 |
{ |
| 601 |
poll_wait (); |
| 602 |
poll_cb (); |
| 603 |
} |
| 604 |
|
| 605 |
int |
| 606 |
poll_fileno() |
| 607 |
PROTOTYPE: |
| 608 |
CODE: |
| 609 |
RETVAL = respipe [0]; |
| 610 |
OUTPUT: |
| 611 |
RETVAL |
| 612 |
|
| 613 |
int |
| 614 |
poll_cb(...) |
| 615 |
PROTOTYPE: |
| 616 |
CODE: |
| 617 |
RETVAL = poll_cb (); |
| 618 |
OUTPUT: |
| 619 |
RETVAL |
| 620 |
|
| 621 |
void |
| 622 |
poll_wait() |
| 623 |
PROTOTYPE: |
| 624 |
CODE: |
| 625 |
if (nreqs) |
| 626 |
poll_wait (); |
| 627 |
|
| 628 |
int |
| 629 |
nreqs() |
| 630 |
PROTOTYPE: |
| 631 |
CODE: |
| 632 |
RETVAL = nreqs; |
| 633 |
OUTPUT: |
| 634 |
RETVAL |
| 635 |
|
