| 1 |
#include "EXTERN.h" |
| 2 |
#include "perl.h" |
| 3 |
#include "XSUB.h" |
| 4 |
|
| 5 |
#include "ecb.h" |
| 6 |
#include "schmorp.h" |
| 7 |
|
| 8 |
typedef volatile sig_atomic_t atomic_t; |
| 9 |
|
| 10 |
static int *sig_pending, *psig_pend; /* make local copies because of missing THX */ |
| 11 |
static Sighandler_t old_sighandler; |
| 12 |
static atomic_t async_pending; |
| 13 |
|
| 14 |
#define PERL_VERSION_ATLEAST(a,b,c) \ |
| 15 |
(PERL_REVISION > (a) \ |
| 16 |
|| (PERL_REVISION == (a) \ |
| 17 |
&& (PERL_VERSION > (b) \ |
| 18 |
|| (PERL_VERSION == (b) && PERL_SUBVERSION >= (c))))) |
| 19 |
|
| 20 |
#if defined(HAS_SIGACTION) && defined(SA_SIGINFO) |
| 21 |
# define HAS_SA_SIGINFO 1 |
| 22 |
#endif |
| 23 |
|
| 24 |
#if !PERL_VERSION_ATLEAST(5,10,0) |
| 25 |
# undef HAS_SA_SIGINFO |
| 26 |
#endif |
| 27 |
|
| 28 |
/*****************************************************************************/ |
| 29 |
|
| 30 |
typedef struct { |
| 31 |
SV *cb; |
| 32 |
void (*c_cb)(pTHX_ void *c_arg, int value); |
| 33 |
void *c_arg; |
| 34 |
SV *fh_r, *fh_w; |
| 35 |
SV *value; |
| 36 |
int signum; |
| 37 |
int autodrain; |
| 38 |
ANY *scope_savestack; |
| 39 |
volatile int blocked; |
| 40 |
|
| 41 |
s_epipe ep; |
| 42 |
int fd_wlen; |
| 43 |
atomic_t fd_enable; |
| 44 |
atomic_t pending; |
| 45 |
volatile IV *valuep; |
| 46 |
atomic_t hysteresis; |
| 47 |
} async_t; |
| 48 |
|
| 49 |
static AV *asyncs; |
| 50 |
static async_t *sig_async [SIG_SIZE]; |
| 51 |
|
| 52 |
#define SvASYNC_nrv(sv) INT2PTR (async_t *, SvIVX (sv)) |
| 53 |
#define SvASYNC(rv) SvASYNC_nrv (SvRV (rv)) |
| 54 |
|
| 55 |
static void async_signal (void *signal_arg, int value); |
| 56 |
|
| 57 |
static void |
| 58 |
setsig (int signum, void (*handler)(int)) |
| 59 |
{ |
| 60 |
#if _WIN32 |
| 61 |
signal (signum, handler); |
| 62 |
#else |
| 63 |
struct sigaction sa; |
| 64 |
sa.sa_handler = handler; |
| 65 |
sigfillset (&sa.sa_mask); |
| 66 |
sa.sa_flags = 0; /* if we interrupt a syscall, we might drain the pipe before it became ready */ |
| 67 |
sigaction (signum, &sa, 0); |
| 68 |
#endif |
| 69 |
} |
| 70 |
|
| 71 |
static void |
| 72 |
async_sigsend (int signum) |
| 73 |
{ |
| 74 |
async_signal (sig_async [signum], 0); |
| 75 |
} |
| 76 |
|
| 77 |
/* the main workhorse to signal */ |
| 78 |
static void |
| 79 |
async_signal (void *signal_arg, int value) |
| 80 |
{ |
| 81 |
static char pipedata [8]; |
| 82 |
|
| 83 |
async_t *async = (async_t *)signal_arg; |
| 84 |
int pending = async->pending; |
| 85 |
|
| 86 |
if (async->hysteresis) |
| 87 |
setsig (async->signum, SIG_IGN); |
| 88 |
|
| 89 |
*async->valuep = value ? value : 1; |
| 90 |
ECB_MEMORY_FENCE_RELEASE; |
| 91 |
async->pending = 1; |
| 92 |
ECB_MEMORY_FENCE_RELEASE; |
| 93 |
async_pending = 1; |
| 94 |
ECB_MEMORY_FENCE_RELEASE; |
| 95 |
|
| 96 |
if (!async->blocked) |
| 97 |
{ |
| 98 |
psig_pend [9] = 1; |
| 99 |
ECB_MEMORY_FENCE_RELEASE; |
| 100 |
*sig_pending = 1; |
| 101 |
ECB_MEMORY_FENCE_RELEASE; |
| 102 |
} |
| 103 |
|
| 104 |
if (!pending && async->fd_enable && async->ep.len) |
| 105 |
s_epipe_signal (&async->ep); |
| 106 |
} |
| 107 |
|
| 108 |
static void |
| 109 |
handle_async (async_t *async) |
| 110 |
{ |
| 111 |
int old_errno = errno; |
| 112 |
int value = *async->valuep; |
| 113 |
|
| 114 |
*async->valuep = 0; |
| 115 |
async->pending = 0; |
| 116 |
|
| 117 |
/* restore signal */ |
| 118 |
if (async->hysteresis) |
| 119 |
setsig (async->signum, async_sigsend); |
| 120 |
|
| 121 |
/* drain pipe */ |
| 122 |
if (async->fd_enable && async->ep.len && async->autodrain) |
| 123 |
s_epipe_drain (&async->ep); |
| 124 |
|
| 125 |
if (async->c_cb) |
| 126 |
{ |
| 127 |
dTHX; |
| 128 |
async->c_cb (aTHX_ async->c_arg, value); |
| 129 |
} |
| 130 |
|
| 131 |
if (async->cb) |
| 132 |
{ |
| 133 |
dSP; |
| 134 |
|
| 135 |
SV *saveerr = SvOK (ERRSV) ? sv_mortalcopy (ERRSV) : 0; |
| 136 |
SV *savedie = PL_diehook; |
| 137 |
|
| 138 |
PL_diehook = 0; |
| 139 |
|
| 140 |
PUSHSTACKi (PERLSI_SIGNAL); |
| 141 |
|
| 142 |
PUSHMARK (SP); |
| 143 |
XPUSHs (sv_2mortal (newSViv (value))); |
| 144 |
PUTBACK; |
| 145 |
call_sv (async->cb, G_VOID | G_DISCARD | G_EVAL); |
| 146 |
|
| 147 |
if (SvTRUE (ERRSV)) |
| 148 |
{ |
| 149 |
SPAGAIN; |
| 150 |
|
| 151 |
PUSHMARK (SP); |
| 152 |
PUTBACK; |
| 153 |
call_sv (get_sv ("Async::Interrupt::DIED", 1), G_VOID | G_DISCARD | G_EVAL | G_KEEPERR); |
| 154 |
|
| 155 |
sv_setpvn (ERRSV, "", 0); |
| 156 |
} |
| 157 |
|
| 158 |
if (saveerr) |
| 159 |
sv_setsv (ERRSV, saveerr); |
| 160 |
|
| 161 |
{ |
| 162 |
SV *oldhook = PL_diehook; |
| 163 |
PL_diehook = savedie; |
| 164 |
SvREFCNT_dec (oldhook); |
| 165 |
} |
| 166 |
|
| 167 |
POPSTACK; |
| 168 |
} |
| 169 |
|
| 170 |
errno = old_errno; |
| 171 |
} |
| 172 |
|
| 173 |
static void |
| 174 |
handle_asyncs (void) |
| 175 |
{ |
| 176 |
int i; |
| 177 |
|
| 178 |
ECB_MEMORY_FENCE_ACQUIRE; |
| 179 |
|
| 180 |
async_pending = 0; |
| 181 |
|
| 182 |
for (i = AvFILLp (asyncs); i >= 0; --i) |
| 183 |
{ |
| 184 |
SV *async_sv = AvARRAY (asyncs)[i]; |
| 185 |
async_t *async = SvASYNC_nrv (async_sv); |
| 186 |
|
| 187 |
if (async->pending && !async->blocked) |
| 188 |
{ |
| 189 |
/* temporarily keep a refcount */ |
| 190 |
SvREFCNT_inc (async_sv); |
| 191 |
handle_async (async); |
| 192 |
SvREFCNT_dec (async_sv); |
| 193 |
|
| 194 |
/* the handler could have deleted any number of asyncs */ |
| 195 |
if (i > AvFILLp (asyncs)) |
| 196 |
i = AvFILLp (asyncs); |
| 197 |
} |
| 198 |
} |
| 199 |
} |
| 200 |
|
| 201 |
#if HAS_SA_SIGINFO |
| 202 |
static Signal_t async_sighandler (int signum, siginfo_t *si, void *sarg) |
| 203 |
{ |
| 204 |
if (signum == 9) |
| 205 |
handle_asyncs (); |
| 206 |
else |
| 207 |
old_sighandler (signum, si, sarg); |
| 208 |
} |
| 209 |
#else |
| 210 |
static Signal_t async_sighandler (int signum) |
| 211 |
{ |
| 212 |
if (signum == 9) |
| 213 |
handle_asyncs (); |
| 214 |
else |
| 215 |
old_sighandler (signum); |
| 216 |
} |
| 217 |
#endif |
| 218 |
|
| 219 |
#define block(async) ++(async)->blocked |
| 220 |
|
| 221 |
static void |
| 222 |
unblock (async_t *async) |
| 223 |
{ |
| 224 |
--async->blocked; |
| 225 |
if (async->pending && !async->blocked) |
| 226 |
handle_async (async); |
| 227 |
} |
| 228 |
|
| 229 |
static void |
| 230 |
scope_block_cb (pTHX_ void *async_sv) |
| 231 |
{ |
| 232 |
async_t *async = SvASYNC_nrv ((SV *)async_sv); |
| 233 |
|
| 234 |
async->scope_savestack = 0; |
| 235 |
unblock (async); |
| 236 |
SvREFCNT_dec (async_sv); |
| 237 |
} |
| 238 |
|
| 239 |
static void |
| 240 |
scope_block (SV *async_sv) |
| 241 |
{ |
| 242 |
async_t *async = SvASYNC_nrv (async_sv); |
| 243 |
|
| 244 |
/* as a heuristic, we skip the scope block if we already are blocked */ |
| 245 |
/* and the existing scope block used the same savestack */ |
| 246 |
|
| 247 |
if (!async->scope_savestack || async->scope_savestack != PL_savestack) |
| 248 |
{ |
| 249 |
async->scope_savestack = PL_savestack; |
| 250 |
block (async); |
| 251 |
|
| 252 |
LEAVE; /* unfortunately, perl sandwiches XS calls into ENTER/LEAVE */ |
| 253 |
SAVEDESTRUCTOR_X (scope_block_cb, (void *)SvREFCNT_inc (async_sv)); |
| 254 |
ENTER; /* unfortunately, perl sandwiches XS calls into ENTER/LEAVE */ |
| 255 |
} |
| 256 |
} |
| 257 |
|
| 258 |
MODULE = Async::Interrupt PACKAGE = Async::Interrupt |
| 259 |
|
| 260 |
BOOT: |
| 261 |
old_sighandler = PL_sighandlerp; |
| 262 |
PL_sighandlerp = async_sighandler; |
| 263 |
sig_pending = &PL_sig_pending; |
| 264 |
psig_pend = PL_psig_pend; |
| 265 |
asyncs = newAV (); |
| 266 |
CvNODEBUG_on (get_cv ("Async::Interrupt::scope_block", 0)); /* otherwise calling scope can be the debugger */ |
| 267 |
|
| 268 |
PROTOTYPES: DISABLE |
| 269 |
|
| 270 |
void |
| 271 |
_alloc (SV *cb, void *c_cb, void *c_arg, SV *fh_r, SV *fh_w, SV *signl, SV *pvalue) |
| 272 |
PPCODE: |
| 273 |
{ |
| 274 |
SV *cv = SvOK (cb) ? SvREFCNT_inc (s_get_cv_croak (cb)) : 0; |
| 275 |
async_t *async; |
| 276 |
|
| 277 |
Newz (0, async, 1, async_t); |
| 278 |
|
| 279 |
XPUSHs (sv_2mortal (newSViv (PTR2IV (async)))); |
| 280 |
/* TODO: need to bless right now to ensure deallocation */ |
| 281 |
av_push (asyncs, TOPs); |
| 282 |
|
| 283 |
SvGETMAGIC (fh_r); SvGETMAGIC (fh_w); |
| 284 |
if (SvOK (fh_r) || SvOK (fh_w)) |
| 285 |
{ |
| 286 |
int fd_r = s_fileno_croak (fh_r, 0); |
| 287 |
int fd_w = s_fileno_croak (fh_w, 1); |
| 288 |
|
| 289 |
async->fh_r = newSVsv (fh_r); |
| 290 |
async->fh_w = newSVsv (fh_w); |
| 291 |
async->ep.fd [0] = fd_r; |
| 292 |
async->ep.fd [1] = fd_w; |
| 293 |
async->ep.len = 1; |
| 294 |
async->fd_enable = 1; |
| 295 |
} |
| 296 |
|
| 297 |
async->value = SvROK (pvalue) |
| 298 |
? SvREFCNT_inc_NN (SvRV (pvalue)) |
| 299 |
: NEWSV (0, 0); |
| 300 |
|
| 301 |
sv_setiv (async->value, 0); |
| 302 |
SvIOK_only (async->value); /* just to be sure */ |
| 303 |
SvREADONLY_on (async->value); |
| 304 |
|
| 305 |
async->valuep = &(SvIVX (async->value)); |
| 306 |
|
| 307 |
async->autodrain = 1; |
| 308 |
async->cb = cv; |
| 309 |
async->c_cb = c_cb; |
| 310 |
async->c_arg = c_arg; |
| 311 |
async->signum = SvOK (signl) ? s_signum_croak (signl) : 0; |
| 312 |
|
| 313 |
if (async->signum) |
| 314 |
{ |
| 315 |
if (async->signum < 0) |
| 316 |
croak ("Async::Interrupt::new got passed illegal signal name or number: %s", SvPV_nolen (signl)); |
| 317 |
|
| 318 |
sig_async [async->signum] = async; |
| 319 |
setsig (async->signum, async_sigsend); |
| 320 |
} |
| 321 |
} |
| 322 |
|
| 323 |
void |
| 324 |
signal_hysteresis (async_t *async, int enable) |
| 325 |
CODE: |
| 326 |
async->hysteresis = enable; |
| 327 |
|
| 328 |
void |
| 329 |
signal_func (async_t *async) |
| 330 |
PPCODE: |
| 331 |
EXTEND (SP, 2); |
| 332 |
PUSHs (sv_2mortal (newSViv (PTR2IV (async_signal)))); |
| 333 |
PUSHs (sv_2mortal (newSViv (PTR2IV (async)))); |
| 334 |
|
| 335 |
void |
| 336 |
scope_block_func (SV *self) |
| 337 |
PPCODE: |
| 338 |
EXTEND (SP, 2); |
| 339 |
PUSHs (sv_2mortal (newSViv (PTR2IV (scope_block)))); |
| 340 |
PUSHs (sv_2mortal (newSViv (PTR2IV (SvRV (self))))); |
| 341 |
|
| 342 |
IV |
| 343 |
c_var (async_t *async) |
| 344 |
CODE: |
| 345 |
RETVAL = PTR2IV (async->valuep); |
| 346 |
OUTPUT: |
| 347 |
RETVAL |
| 348 |
|
| 349 |
void |
| 350 |
handle (async_t *async) |
| 351 |
CODE: |
| 352 |
handle_async (async); |
| 353 |
|
| 354 |
void |
| 355 |
signal (async_t *async, int value = 1) |
| 356 |
CODE: |
| 357 |
async_signal (async, value); |
| 358 |
|
| 359 |
void |
| 360 |
block (async_t *async) |
| 361 |
CODE: |
| 362 |
block (async); |
| 363 |
|
| 364 |
void |
| 365 |
unblock (async_t *async) |
| 366 |
CODE: |
| 367 |
unblock (async); |
| 368 |
|
| 369 |
void |
| 370 |
scope_block (SV *self) |
| 371 |
CODE: |
| 372 |
scope_block (SvRV (self)); |
| 373 |
|
| 374 |
void |
| 375 |
pipe_enable (async_t *async) |
| 376 |
ALIAS: |
| 377 |
pipe_enable = 1 |
| 378 |
pipe_disable = 0 |
| 379 |
CODE: |
| 380 |
async->fd_enable = ix; |
| 381 |
|
| 382 |
int |
| 383 |
pipe_fileno (async_t *async) |
| 384 |
CODE: |
| 385 |
if (!async->ep.len) |
| 386 |
{ |
| 387 |
int res; |
| 388 |
|
| 389 |
/*block (async);*//*TODO*/ |
| 390 |
res = s_epipe_new (&async->ep); |
| 391 |
async->fd_enable = 1; |
| 392 |
/*unblock (async);*//*TODO*/ |
| 393 |
|
| 394 |
if (res < 0) |
| 395 |
croak ("Async::Interrupt: unable to initialize event pipe"); |
| 396 |
} |
| 397 |
|
| 398 |
RETVAL = async->ep.fd [0]; |
| 399 |
OUTPUT: |
| 400 |
RETVAL |
| 401 |
|
| 402 |
int |
| 403 |
pipe_autodrain (async_t *async, int enable = -1) |
| 404 |
CODE: |
| 405 |
RETVAL = async->autodrain; |
| 406 |
if (enable >= 0) |
| 407 |
async->autodrain = enable; |
| 408 |
OUTPUT: |
| 409 |
RETVAL |
| 410 |
|
| 411 |
void |
| 412 |
pipe_drain (async_t *async) |
| 413 |
CODE: |
| 414 |
if (async->ep.len) |
| 415 |
s_epipe_drain (&async->ep); |
| 416 |
|
| 417 |
void |
| 418 |
post_fork (async_t *async) |
| 419 |
CODE: |
| 420 |
if (async->ep.len) |
| 421 |
{ |
| 422 |
int res; |
| 423 |
|
| 424 |
/*block (async);*//*TODO*/ |
| 425 |
res = s_epipe_renew (&async->ep); |
| 426 |
/*unblock (async);*//*TODO*/ |
| 427 |
|
| 428 |
if (res < 0) |
| 429 |
croak ("Async::Interrupt: unable to initialize event pipe after fork"); |
| 430 |
} |
| 431 |
|
| 432 |
void |
| 433 |
DESTROY (SV *self) |
| 434 |
CODE: |
| 435 |
{ |
| 436 |
int i; |
| 437 |
SV *async_sv = SvRV (self); |
| 438 |
async_t *async = SvASYNC_nrv (async_sv); |
| 439 |
|
| 440 |
for (i = AvFILLp (asyncs); i >= 0; --i) |
| 441 |
if (AvARRAY (asyncs)[i] == async_sv) |
| 442 |
{ |
| 443 |
AvARRAY (asyncs)[i] = AvARRAY (asyncs)[AvFILLp (asyncs)]; |
| 444 |
av_pop (asyncs); |
| 445 |
goto found; |
| 446 |
} |
| 447 |
|
| 448 |
if (!PL_dirty) |
| 449 |
warn ("Async::Interrupt::DESTROY could not find async object in list of asyncs, please report"); |
| 450 |
|
| 451 |
found: |
| 452 |
|
| 453 |
if (async->signum) |
| 454 |
setsig (async->signum, SIG_DFL); |
| 455 |
|
| 456 |
if (!async->fh_r && async->ep.len) |
| 457 |
s_epipe_destroy (&async->ep); |
| 458 |
|
| 459 |
SvREFCNT_dec (async->fh_r); |
| 460 |
SvREFCNT_dec (async->fh_w); |
| 461 |
SvREFCNT_dec (async->cb); |
| 462 |
SvREFCNT_dec (async->value); |
| 463 |
|
| 464 |
Safefree (async); |
| 465 |
} |
| 466 |
|
| 467 |
SV * |
| 468 |
sig2num (SV *signame_or_number) |
| 469 |
ALIAS: |
| 470 |
sig2num = 0 |
| 471 |
sig2name = 1 |
| 472 |
PROTOTYPE: $ |
| 473 |
CODE: |
| 474 |
{ |
| 475 |
int signum = s_signum (signame_or_number); |
| 476 |
|
| 477 |
if (signum < 0) |
| 478 |
RETVAL = &PL_sv_undef; |
| 479 |
else if (ix) |
| 480 |
RETVAL = newSVpv (PL_sig_name [signum], 0); |
| 481 |
else |
| 482 |
RETVAL = newSViv (signum); |
| 483 |
} |
| 484 |
OUTPUT: |
| 485 |
RETVAL |
| 486 |
|
| 487 |
MODULE = Async::Interrupt PACKAGE = Async::Interrupt::EventPipe PREFIX = s_epipe_ |
| 488 |
|
| 489 |
void |
| 490 |
new (const char *klass) |
| 491 |
PPCODE: |
| 492 |
{ |
| 493 |
s_epipe *epp; |
| 494 |
|
| 495 |
Newz (0, epp, 1, s_epipe); |
| 496 |
XPUSHs (sv_setref_iv (sv_newmortal (), klass, PTR2IV (epp))); |
| 497 |
|
| 498 |
if (s_epipe_new (epp) < 0) |
| 499 |
croak ("Async::Interrupt::EventPipe: unable to create new event pipe"); |
| 500 |
} |
| 501 |
|
| 502 |
void |
| 503 |
filenos (s_epipe *epp) |
| 504 |
PPCODE: |
| 505 |
EXTEND (SP, 2); |
| 506 |
PUSHs (sv_2mortal (newSViv (epp->fd [0]))); |
| 507 |
PUSHs (sv_2mortal (newSViv (epp->fd [1]))); |
| 508 |
|
| 509 |
int |
| 510 |
fileno (s_epipe *epp) |
| 511 |
ALIAS: |
| 512 |
fileno = 0 |
| 513 |
fileno_r = 0 |
| 514 |
fileno_w = 1 |
| 515 |
CODE: |
| 516 |
RETVAL = epp->fd [ix]; |
| 517 |
OUTPUT: |
| 518 |
RETVAL |
| 519 |
|
| 520 |
int |
| 521 |
type (s_epipe *epp) |
| 522 |
CODE: |
| 523 |
RETVAL = epp->len; |
| 524 |
OUTPUT: |
| 525 |
RETVAL |
| 526 |
|
| 527 |
void |
| 528 |
s_epipe_signal (s_epipe *epp) |
| 529 |
|
| 530 |
void |
| 531 |
s_epipe_drain (s_epipe *epp) |
| 532 |
|
| 533 |
void |
| 534 |
signal_func (s_epipe *epp) |
| 535 |
ALIAS: |
| 536 |
drain_func = 1 |
| 537 |
PPCODE: |
| 538 |
EXTEND (SP, 2); |
| 539 |
PUSHs (sv_2mortal (newSViv (PTR2IV (ix ? s_epipe_drain : s_epipe_signal)))); |
| 540 |
PUSHs (sv_2mortal (newSViv (PTR2IV (epp)))); |
| 541 |
|
| 542 |
void |
| 543 |
s_epipe_wait (s_epipe *epp) |
| 544 |
|
| 545 |
void |
| 546 |
DESTROY (s_epipe *epp) |
| 547 |
CODE: |
| 548 |
s_epipe_destroy (epp); |
| 549 |
|
