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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 | /* Copyright (C) 2002-2004, 2006-2008, 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _LOWLEVELLOCK_H #define _LOWLEVELLOCK_H 1 #ifndef __ASSEMBLER__ # include <time.h> # include <sys/param.h> # include <bits/pthreadtypes.h> # include <bits/kernel-features.h> # include <tcb-offsets.h> # ifndef LOCK_INSTR # ifdef UP # define LOCK_INSTR /* nothing */ # else # define LOCK_INSTR "lock;" # endif # endif #else # ifndef LOCK # ifdef UP # define LOCK # else # define LOCK lock # endif # endif #endif #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 #define FUTEX_CMP_REQUEUE 4 #define FUTEX_WAKE_OP 5 #define FUTEX_LOCK_PI 6 #define FUTEX_UNLOCK_PI 7 #define FUTEX_TRYLOCK_PI 8 #define FUTEX_WAIT_BITSET 9 #define FUTEX_WAKE_BITSET 10 #define FUTEX_WAIT_REQUEUE_PI 11 #define FUTEX_CMP_REQUEUE_PI 12 #define FUTEX_PRIVATE_FLAG 128 #define FUTEX_CLOCK_REALTIME 256 #define FUTEX_BITSET_MATCH_ANY 0xffffffff #define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1) /* Values for 'private' parameter of locking macros. Yes, the definition seems to be backwards. But it is not. The bit will be reversed before passing to the system call. */ #define LLL_PRIVATE 0 #define LLL_SHARED FUTEX_PRIVATE_FLAG #ifndef __ASSEMBLER__ #if !defined NOT_IN_libc || defined IS_IN_rtld /* In libc.so or ld.so all futexes are private. */ # ifdef __ASSUME_PRIVATE_FUTEX # define __lll_private_flag(fl, private) \ ((fl) | FUTEX_PRIVATE_FLAG) # else # define __lll_private_flag(fl, private) \ ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) # endif #else # ifdef __ASSUME_PRIVATE_FUTEX # define __lll_private_flag(fl, private) \ (((fl) | FUTEX_PRIVATE_FLAG) ^ (private)) # else # define __lll_private_flag(fl, private) \ (__builtin_constant_p (private) \ ? ((private) == 0 \ ? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \ : (fl)) \ : ({ unsigned int __fl = ((private) ^ FUTEX_PRIVATE_FLAG); \ __asm__ ("andl %%fs:%P1, %0" : "+r" (__fl) \ : "i" (offsetof (struct pthread, header.private_futex))); \ __fl | (fl); })) # endif #endif /* Initializer for lock. */ #define LLL_LOCK_INITIALIZER (0) #define LLL_LOCK_INITIALIZER_LOCKED (1) #define LLL_LOCK_INITIALIZER_WAITERS (2) /* Delay in spinlock loop. */ #define BUSY_WAIT_NOP __asm__ ("rep; nop") #define LLL_STUB_UNWIND_INFO_START \ ".section .eh_frame,\"a\",@progbits\n" \ "7:\t" ".long 9f-8f # Length of Common Information Entry\n" \ "8:\t" ".long 0x0 # CIE Identifier Tag\n\t" \ ".byte 0x1 # CIE Version\n\t" \ ".ascii \"zR\\0\" # CIE Augmentation\n\t" \ ".uleb128 0x1 # CIE Code Alignment Factor\n\t" \ ".sleb128 -8 # CIE Data Alignment Factor\n\t" \ ".byte 0x10 # CIE RA Column\n\t" \ ".uleb128 0x1 # Augmentation size\n\t" \ ".byte 0x1b # FDE Encoding (pcrel sdata4)\n\t" \ ".byte 0x12 # DW_CFA_def_cfa_sf\n\t" \ ".uleb128 0x7\n\t" \ ".sleb128 16\n\t" \ ".align 8\n" \ "9:\t" ".long 23f-10f # FDE Length\n" \ "10:\t" ".long 10b-7b # FDE CIE offset\n\t" \ ".long 1b-. # FDE initial location\n\t" \ ".long 6b-1b # FDE address range\n\t" \ ".uleb128 0x0 # Augmentation size\n\t" \ ".byte 0x16 # DW_CFA_val_expression\n\t" \ ".uleb128 0x10\n\t" \ ".uleb128 12f-11f\n" \ "11:\t" ".byte 0x80 # DW_OP_breg16\n\t" \ ".sleb128 4b-1b\n" #define LLL_STUB_UNWIND_INFO_END \ ".byte 0x16 # DW_CFA_val_expression\n\t" \ ".uleb128 0x10\n\t" \ ".uleb128 14f-13f\n" \ "13:\t" ".byte 0x80 # DW_OP_breg16\n\t" \ ".sleb128 4b-2b\n" \ "14:\t" ".byte 0x40 + (3b-2b) # DW_CFA_advance_loc\n\t" \ ".byte 0x0e # DW_CFA_def_cfa_offset\n\t" \ ".uleb128 0\n\t" \ ".byte 0x16 # DW_CFA_val_expression\n\t" \ ".uleb128 0x10\n\t" \ ".uleb128 16f-15f\n" \ "15:\t" ".byte 0x80 # DW_OP_breg16\n\t" \ ".sleb128 4b-3b\n" \ "16:\t" ".byte 0x40 + (4b-3b-1) # DW_CFA_advance_loc\n\t" \ ".byte 0x0e # DW_CFA_def_cfa_offset\n\t" \ ".uleb128 128\n\t" \ ".byte 0x16 # DW_CFA_val_expression\n\t" \ ".uleb128 0x10\n\t" \ ".uleb128 20f-17f\n" \ "17:\t" ".byte 0x80 # DW_OP_breg16\n\t" \ ".sleb128 19f-18f\n\t" \ ".byte 0x0d # DW_OP_const4s\n" \ "18:\t" ".4byte 4b-.\n\t" \ ".byte 0x1c # DW_OP_minus\n\t" \ ".byte 0x0d # DW_OP_const4s\n" \ "19:\t" ".4byte 24f-.\n\t" \ ".byte 0x22 # DW_OP_plus\n" \ "20:\t" ".byte 0x40 + (5b-4b+1) # DW_CFA_advance_loc\n\t" \ ".byte 0x13 # DW_CFA_def_cfa_offset_sf\n\t" \ ".sleb128 16\n\t" \ ".byte 0x16 # DW_CFA_val_expression\n\t" \ ".uleb128 0x10\n\t" \ ".uleb128 22f-21f\n" \ "21:\t" ".byte 0x80 # DW_OP_breg16\n\t" \ ".sleb128 4b-5b\n" \ "22:\t" ".align 8\n" \ "23:\t" ".previous\n" /* Unwind info for 1: leaq ..., %rdi 2: subq $128, %rsp 3: callq ... 4: addq $128, %rsp 5: jmp 24f 6: snippet. */ #define LLL_STUB_UNWIND_INFO_5 \ LLL_STUB_UNWIND_INFO_START \ "12:\t" ".byte 0x40 + (2b-1b) # DW_CFA_advance_loc\n\t" \ LLL_STUB_UNWIND_INFO_END /* Unwind info for 1: leaq ..., %rdi 0: movq ..., %rdx 2: subq $128, %rsp 3: callq ... 4: addq $128, %rsp 5: jmp 24f 6: snippet. */ #define LLL_STUB_UNWIND_INFO_6 \ LLL_STUB_UNWIND_INFO_START \ "12:\t" ".byte 0x40 + (0b-1b) # DW_CFA_advance_loc\n\t" \ ".byte 0x16 # DW_CFA_val_expression\n\t" \ ".uleb128 0x10\n\t" \ ".uleb128 26f-25f\n" \ "25:\t" ".byte 0x80 # DW_OP_breg16\n\t" \ ".sleb128 4b-0b\n" \ "26:\t" ".byte 0x40 + (2b-0b) # DW_CFA_advance_loc\n\t" \ LLL_STUB_UNWIND_INFO_END #define lll_futex_wait(futex, val, private) \ lll_futex_timed_wait(futex, val, NULL, private) #define lll_futex_timed_wait(futex, val, timeout, private) \ ({ \ register const struct timespec *__to __asm__ ("r10") = timeout; \ int __status; \ register __typeof (val) _val __asm__ ("edx") = (val); \ __asm__ __volatile__ ("syscall" \ : "=a" (__status) \ : "0" (SYS_futex), "D" (futex), \ "S" (__lll_private_flag (FUTEX_WAIT, private)), \ "d" (_val), "r" (__to) \ : "memory", "cc", "r11", "cx"); \ __status; \ }) #define lll_futex_wake(futex, nr, private) \ do { \ int __ignore; \ register __typeof (nr) _nr __asm__ ("edx") = (nr); \ __asm__ __volatile__ ("syscall" \ : "=a" (__ignore) \ : "0" (SYS_futex), "D" (futex), \ "S" (__lll_private_flag (FUTEX_WAKE, private)), \ "d" (_nr) \ : "memory", "cc", "r10", "r11", "cx"); \ } while (0) /* NB: in the lll_trylock macro we simply return the value in %eax after the cmpxchg instruction. In case the operation succeded this value is zero. In case the operation failed, the cmpxchg instruction has loaded the current value of the memory work which is guaranteed to be nonzero. */ #if defined NOT_IN_libc || defined UP # define __lll_trylock_asm LOCK_INSTR "cmpxchgl %2, %1" #else # define __lll_trylock_asm "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \ "je 0f\n\t" \ "lock; cmpxchgl %2, %1\n\t" \ "jmp 1f\n\t" \ "0:\tcmpxchgl %2, %1\n\t" \ "1:" #endif #define lll_trylock(futex) \ ({ int ret; \ __asm__ __volatile__ (__lll_trylock_asm \ : "=a" (ret), "=m" (futex) \ : "r" (LLL_LOCK_INITIALIZER_LOCKED), "m" (futex), \ "0" (LLL_LOCK_INITIALIZER) \ : "memory"); \ ret; }) #define lll_robust_trylock(futex, id) \ ({ int ret; \ __asm__ __volatile__ (LOCK_INSTR "cmpxchgl %2, %1" \ : "=a" (ret), "=m" (futex) \ : "r" (id), "m" (futex), "0" (LLL_LOCK_INITIALIZER) \ : "memory"); \ ret; }) #define lll_cond_trylock(futex) \ ({ int ret; \ __asm__ __volatile__ (LOCK_INSTR "cmpxchgl %2, %1" \ : "=a" (ret), "=m" (futex) \ : "r" (LLL_LOCK_INITIALIZER_WAITERS), \ "m" (futex), "0" (LLL_LOCK_INITIALIZER) \ : "memory"); \ ret; }) #if defined NOT_IN_libc || defined UP # define __lll_lock_asm_start LOCK_INSTR "cmpxchgl %4, %2\n\t" \ "jnz 1f\n\t" #else # define __lll_lock_asm_start "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \ "je 0f\n\t" \ "lock; cmpxchgl %4, %2\n\t" \ "jnz 1f\n\t" \ "jmp 24f\n" \ "0:\tcmpxchgl %4, %2\n\t" \ "jnz 1f\n\t" #endif #define lll_lock(futex, private) \ (void) \ ({ int ignore1, ignore2, ignore3; \ if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ __asm__ __volatile__ (__lll_lock_asm_start \ ".subsection 1\n\t" \ ".type _L_lock_%=, @function\n" \ "_L_lock_%=:\n" \ "1:\tleaq %2, %%rdi\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_lock_wait_private\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_lock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_5 \ "24:" \ : "=S" (ignore1), "=&D" (ignore2), "=m" (futex), \ "=a" (ignore3) \ : "0" (1), "m" (futex), "3" (0) \ : "cx", "r11", "cc", "memory"); \ else \ __asm__ __volatile__ (__lll_lock_asm_start \ ".subsection 1\n\t" \ ".type _L_lock_%=, @function\n" \ "_L_lock_%=:\n" \ "1:\tleaq %2, %%rdi\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_lock_wait\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_lock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_5 \ "24:" \ : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ "=a" (ignore3) \ : "1" (1), "m" (futex), "3" (0), "0" (private) \ : "cx", "r11", "cc", "memory"); \ }) \ #define lll_robust_lock(futex, id, private) \ ({ int __ret, ignore1, ignore2; \ __asm__ __volatile__ (LOCK_INSTR "cmpxchgl %4, %2\n\t" \ "jnz 1f\n\t" \ ".subsection 1\n\t" \ ".type _L_robust_lock_%=, @function\n" \ "_L_robust_lock_%=:\n" \ "1:\tleaq %2, %%rdi\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_robust_lock_wait\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_robust_lock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_5 \ "24:" \ : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ "=a" (__ret) \ : "1" (id), "m" (futex), "3" (0), "0" (private) \ : "cx", "r11", "cc", "memory"); \ __ret; }) #define lll_cond_lock(futex, private) \ (void) \ ({ int ignore1, ignore2, ignore3; \ __asm__ __volatile__ (LOCK_INSTR "cmpxchgl %4, %2\n\t" \ "jnz 1f\n\t" \ ".subsection 1\n\t" \ ".type _L_cond_lock_%=, @function\n" \ "_L_cond_lock_%=:\n" \ "1:\tleaq %2, %%rdi\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_lock_wait\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_cond_lock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_5 \ "24:" \ : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ "=a" (ignore3) \ : "1" (2), "m" (futex), "3" (0), "0" (private) \ : "cx", "r11", "cc", "memory"); \ }) #define lll_robust_cond_lock(futex, id, private) \ ({ int __ret, ignore1, ignore2; \ __asm__ __volatile__ (LOCK_INSTR "cmpxchgl %4, %2\n\t" \ "jnz 1f\n\t" \ ".subsection 1\n\t" \ ".type _L_robust_cond_lock_%=, @function\n" \ "_L_robust_cond_lock_%=:\n" \ "1:\tleaq %2, %%rdi\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_robust_lock_wait\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_robust_cond_lock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_5 \ "24:" \ : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ "=a" (__ret) \ : "1" (id | FUTEX_WAITERS), "m" (futex), "3" (0), \ "0" (private) \ : "cx", "r11", "cc", "memory"); \ __ret; }) #define lll_timedlock(futex, timeout, private) \ ({ int __ret, ignore1, ignore2, ignore3; \ __asm__ __volatile__ (LOCK_INSTR "cmpxchgl %1, %4\n\t" \ "jnz 1f\n\t" \ ".subsection 1\n\t" \ ".type _L_timedlock_%=, @function\n" \ "_L_timedlock_%=:\n" \ "1:\tleaq %4, %%rdi\n" \ "0:\tmovq %8, %%rdx\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_timedlock_wait\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_timedlock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_6 \ "24:" \ : "=a" (__ret), "=D" (ignore1), "=S" (ignore2), \ "=&d" (ignore3), "=m" (futex) \ : "0" (0), "1" (1), "m" (futex), "m" (timeout), \ "2" (private) \ : "memory", "cx", "cc", "r10", "r11"); \ __ret; }) #define lll_robust_timedlock(futex, timeout, id, private) \ ({ int __ret, ignore1, ignore2, ignore3; \ __asm__ __volatile__ (LOCK_INSTR "cmpxchgl %1, %4\n\t" \ "jnz 1f\n\t" \ ".subsection 1\n\t" \ ".type _L_robust_timedlock_%=, @function\n" \ "_L_robust_timedlock_%=:\n" \ "1:\tleaq %4, %%rdi\n" \ "0:\tmovq %8, %%rdx\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_robust_timedlock_wait\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_robust_timedlock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_6 \ "24:" \ : "=a" (__ret), "=D" (ignore1), "=S" (ignore2), \ "=&d" (ignore3), "=m" (futex) \ : "0" (0), "1" (id), "m" (futex), "m" (timeout), \ "2" (private) \ : "memory", "cx", "cc", "r10", "r11"); \ __ret; }) #if defined NOT_IN_libc || defined UP # define __lll_unlock_asm_start LOCK_INSTR "decl %0\n\t" \ "jne 1f\n\t" #else # define __lll_unlock_asm_start "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \ "je 0f\n\t" \ "lock; decl %0\n\t" \ "jne 1f\n\t" \ "jmp 24f\n\t" \ "0:\tdecl %0\n\t" \ "jne 1f\n\t" #endif #define lll_unlock(futex, private) \ (void) \ ({ int ignore; \ if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ __asm__ __volatile__ (__lll_unlock_asm_start \ ".subsection 1\n\t" \ ".type _L_unlock_%=, @function\n" \ "_L_unlock_%=:\n" \ "1:\tleaq %0, %%rdi\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_unlock_wake_private\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_unlock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_5 \ "24:" \ : "=m" (futex), "=&D" (ignore) \ : "m" (futex) \ : "ax", "cx", "r11", "cc", "memory"); \ else \ __asm__ __volatile__ (__lll_unlock_asm_start \ ".subsection 1\n\t" \ ".type _L_unlock_%=, @function\n" \ "_L_unlock_%=:\n" \ "1:\tleaq %0, %%rdi\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_unlock_wake\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_unlock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_5 \ "24:" \ : "=m" (futex), "=&D" (ignore) \ : "m" (futex), "S" (private) \ : "ax", "cx", "r11", "cc", "memory"); \ }) #define lll_robust_unlock(futex, private) \ do \ { \ int ignore; \ __asm__ __volatile__ (LOCK_INSTR "andl %2, %0\n\t" \ "jne 1f\n\t" \ ".subsection 1\n\t" \ ".type _L_robust_unlock_%=, @function\n" \ "_L_robust_unlock_%=:\n" \ "1:\tleaq %0, %%rdi\n" \ "2:\tsubq $128, %%rsp\n" \ "3:\tcallq __lll_unlock_wake\n" \ "4:\taddq $128, %%rsp\n" \ "5:\tjmp 24f\n" \ "6:\t.size _L_robust_unlock_%=, 6b-1b\n\t" \ ".previous\n" \ LLL_STUB_UNWIND_INFO_5 \ "24:" \ : "=m" (futex), "=&D" (ignore) \ : "i" (FUTEX_WAITERS), "m" (futex), \ "S" (private) \ : "ax", "cx", "r11", "cc", "memory"); \ } \ while (0) #define lll_robust_dead(futex, private) \ do \ { \ int ignore; \ __asm__ __volatile__ (LOCK_INSTR "orl %3, (%2)\n\t" \ "syscall" \ : "=m" (futex), "=a" (ignore) \ : "D" (&(futex)), "i" (FUTEX_OWNER_DIED), \ "S" (__lll_private_flag (FUTEX_WAKE, private)), \ "1" (__NR_futex), "d" (1) \ : "cx", "r11", "cc", "memory"); \ } \ while (0) /* Returns non-zero if error happened, zero if success. */ #define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val, private) \ ({ int __res; \ register int __nr_move __asm__ ("r10") = nr_move; \ register void *__mutex __asm__ ("r8") = mutex; \ register int __val __asm__ ("r9") = val; \ __asm__ __volatile__ ("syscall" \ : "=a" (__res) \ : "0" (__NR_futex), "D" ((void *) ftx), \ "S" (__lll_private_flag (FUTEX_CMP_REQUEUE, \ private)), "d" (nr_wake), \ "r" (__nr_move), "r" (__mutex), "r" (__val) \ : "cx", "r11", "cc", "memory"); \ __res < 0; }) #define lll_islocked(futex) \ (futex != LLL_LOCK_INITIALIZER) /* The kernel notifies a process with uses CLONE_CLEARTID via futex wakeup when the clone terminates. The memory location contains the thread ID while the clone is running and is reset to zero afterwards. The macro parameter must not have any side effect. */ #define lll_wait_tid(tid) \ do { \ int __ignore; \ register __typeof (tid) _tid __asm__ ("edx") = (tid); \ if (_tid != 0) \ __asm__ __volatile__ ("xorq %%r10, %%r10\n\t" \ "1:\tmovq %2, %%rax\n\t" \ "syscall\n\t" \ "cmpl $0, (%%rdi)\n\t" \ "jne 1b" \ : "=&a" (__ignore) \ : "S" (FUTEX_WAIT), "i" (SYS_futex), "D" (&tid), \ "d" (_tid) \ : "memory", "cc", "r10", "r11", "cx"); \ } while (0) extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime) attribute_hidden; #define lll_timedwait_tid(tid, abstime) \ ({ \ int __ret = 0; \ if (tid != 0) \ { \ if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \ __ret = EINVAL; \ else \ __ret = __lll_timedwait_tid (&tid, abstime); \ } \ __ret; }) #endif /* !__ASSEMBLER__ */ #endif /* lowlevellock.h */ |