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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 | /* Copyright (C) 2002-2004,2006-2007,2009,2010 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/>. */ #include <sysdep.h> #include <lowlevellock.h> #include <lowlevelcond.h> #include <tcb-offsets.h> #include <pthread-errnos.h> #include <pthread-pi-defines.h> #include <bits/kernel-features.h> .text /* int pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex) */ .globl __pthread_cond_wait .type __pthread_cond_wait, @function .protected __pthread_cond_wait .align 16 __pthread_cond_wait: .LSTARTCODE: cfi_startproc #ifdef SHARED cfi_personality(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect, DW.ref.__gcc_personality_v0) cfi_lsda(DW_EH_PE_pcrel | DW_EH_PE_sdata4, .LexceptSTART) #else cfi_personality(DW_EH_PE_udata4, __gcc_personality_v0) cfi_lsda(DW_EH_PE_udata4, .LexceptSTART) #endif pushl %ebp cfi_adjust_cfa_offset(4) cfi_rel_offset(%ebp, 0) pushl %edi cfi_adjust_cfa_offset(4) cfi_rel_offset(%edi, 0) pushl %esi cfi_adjust_cfa_offset(4) cfi_rel_offset(%esi, 0) pushl %ebx cfi_adjust_cfa_offset(4) cfi_rel_offset(%ebx, 0) xorl %esi, %esi movl 20(%esp), %ebx /* Get internal lock. */ movl $1, %edx xorl %eax, %eax LOCK #if cond_lock == 0 cmpxchgl %edx, (%ebx) #else cmpxchgl %edx, cond_lock(%ebx) #endif jnz 1f /* Store the reference to the mutex. If there is already a different value in there this is a bad user bug. */ 2: cmpl $-1, dep_mutex(%ebx) movl 24(%esp), %eax je 15f movl %eax, dep_mutex(%ebx) /* Unlock the mutex. */ 15: xorl %edx, %edx call __pthread_mutex_unlock_usercnt testl %eax, %eax jne 12f addl $1, total_seq(%ebx) adcl $0, total_seq+4(%ebx) addl $1, cond_futex(%ebx) addl $(1 << nwaiters_shift), cond_nwaiters(%ebx) #define FRAME_SIZE 20 subl $FRAME_SIZE, %esp cfi_adjust_cfa_offset(FRAME_SIZE) cfi_remember_state /* Get and store current wakeup_seq value. */ movl wakeup_seq(%ebx), %edi movl wakeup_seq+4(%ebx), %edx movl broadcast_seq(%ebx), %eax movl %edi, 4(%esp) movl %edx, 8(%esp) movl %eax, 12(%esp) /* Reset the pi-requeued flag. */ 8: movl $0, 16(%esp) movl cond_futex(%ebx), %ebp /* Unlock. */ LOCK #if cond_lock == 0 subl $1, (%ebx) #else subl $1, cond_lock(%ebx) #endif jne 3f .LcleanupSTART: 4: call __pthread_enable_asynccancel movl %eax, (%esp) xorl %ecx, %ecx cmpl $-1, dep_mutex(%ebx) sete %cl je 18f movl dep_mutex(%ebx), %edi /* Requeue to a non-robust PI mutex if the PI bit is set and the robust bit is not set. */ movl MUTEX_KIND(%edi), %eax andl $(ROBUST_BIT|PI_BIT), %eax cmpl $PI_BIT, %eax jne 18f movl $(FUTEX_WAIT_REQUEUE_PI|FUTEX_PRIVATE_FLAG), %ecx movl %ebp, %edx xorl %esi, %esi addl $cond_futex, %ebx movl $SYS_futex, %eax ENTER_KERNEL subl $cond_futex, %ebx /* Set the pi-requeued flag only if the kernel has returned 0. The kernel does not hold the mutex on error. */ cmpl $0, %eax sete 16(%esp) je 19f /* Normal and PI futexes dont mix. Use normal futex functions only if the kernel does not support the PI futex functions. */ cmpl $-ENOSYS, %eax jne 19f xorl %ecx, %ecx 18: subl $1, %ecx #ifdef __ASSUME_PRIVATE_FUTEX andl $FUTEX_PRIVATE_FLAG, %ecx #else andl %gs:PRIVATE_FUTEX, %ecx #endif #if FUTEX_WAIT != 0 addl $FUTEX_WAIT, %ecx #endif movl %ebp, %edx addl $cond_futex, %ebx .Ladd_cond_futex: movl $SYS_futex, %eax ENTER_KERNEL subl $cond_futex, %ebx .Lsub_cond_futex: 19: movl (%esp), %eax call __pthread_disable_asynccancel .LcleanupEND: /* Lock. */ movl $1, %edx xorl %eax, %eax LOCK #if cond_lock == 0 cmpxchgl %edx, (%ebx) #else cmpxchgl %edx, cond_lock(%ebx) #endif jnz 5f 6: movl broadcast_seq(%ebx), %eax cmpl 12(%esp), %eax jne 16f movl woken_seq(%ebx), %eax movl woken_seq+4(%ebx), %ecx movl wakeup_seq(%ebx), %edi movl wakeup_seq+4(%ebx), %edx cmpl 8(%esp), %edx jne 7f cmpl 4(%esp), %edi je 8b 7: cmpl %ecx, %edx jne 9f cmp %eax, %edi je 8b 9: addl $1, woken_seq(%ebx) adcl $0, woken_seq+4(%ebx) /* Unlock */ 16: subl $(1 << nwaiters_shift), cond_nwaiters(%ebx) /* Wake up a thread which wants to destroy the condvar object. */ movl total_seq(%ebx), %eax andl total_seq+4(%ebx), %eax cmpl $0xffffffff, %eax jne 17f movl cond_nwaiters(%ebx), %eax andl $~((1 << nwaiters_shift) - 1), %eax jne 17f addl $cond_nwaiters, %ebx movl $SYS_futex, %eax #if FUTEX_PRIVATE_FLAG > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex-cond_nwaiters(%ebx) sete %cl subl $1, %ecx #ifdef __ASSUME_PRIVATE_FUTEX andl $FUTEX_PRIVATE_FLAG, %ecx #else andl %gs:PRIVATE_FUTEX, %ecx #endif addl $FUTEX_WAKE, %ecx movl $1, %edx ENTER_KERNEL subl $cond_nwaiters, %ebx 17: LOCK #if cond_lock == 0 subl $1, (%ebx) #else subl $1, cond_lock(%ebx) #endif jne 10f /* With requeue_pi, the mutex lock is held in the kernel. */ 11: movl 24+FRAME_SIZE(%esp), %eax movl 16(%esp), %ecx testl %ecx, %ecx jnz 21f call __pthread_mutex_cond_lock 20: addl $FRAME_SIZE, %esp cfi_adjust_cfa_offset(-FRAME_SIZE); 14: popl %ebx cfi_adjust_cfa_offset(-4) cfi_restore(%ebx) popl %esi cfi_adjust_cfa_offset(-4) cfi_restore(%esi) popl %edi cfi_adjust_cfa_offset(-4) cfi_restore(%edi) popl %ebp cfi_adjust_cfa_offset(-4) cfi_restore(%ebp) /* We return the result of the mutex_lock operation. */ ret cfi_restore_state 21: call __pthread_mutex_cond_lock_adjust xorl %eax, %eax jmp 20b cfi_adjust_cfa_offset(-FRAME_SIZE); /* Initial locking failed. */ 1: #if cond_lock == 0 movl %ebx, %edx #else leal cond_lock(%ebx), %edx #endif #if (LLL_SHARED-LLL_PRIVATE) > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex(%ebx) setne %cl subl $1, %ecx andl $(LLL_SHARED-LLL_PRIVATE), %ecx #if LLL_PRIVATE != 0 addl $LLL_PRIVATE, %ecx #endif call __lll_lock_wait jmp 2b /* The initial unlocking of the mutex failed. */ 12: LOCK #if cond_lock == 0 subl $1, (%ebx) #else subl $1, cond_lock(%ebx) #endif jne 14b movl %eax, %esi #if cond_lock == 0 movl %ebx, %eax #else leal cond_lock(%ebx), %eax #endif #if (LLL_SHARED-LLL_PRIVATE) > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex(%ebx) setne %cl subl $1, %ecx andl $(LLL_SHARED-LLL_PRIVATE), %ecx #if LLL_PRIVATE != 0 addl $LLL_PRIVATE, %ecx #endif call __lll_unlock_wake movl %esi, %eax jmp 14b cfi_adjust_cfa_offset(FRAME_SIZE) /* Unlock in loop requires wakeup. */ 3: #if cond_lock == 0 movl %ebx, %eax #else leal cond_lock(%ebx), %eax #endif #if (LLL_SHARED-LLL_PRIVATE) > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex(%ebx) setne %cl subl $1, %ecx andl $(LLL_SHARED-LLL_PRIVATE), %ecx #if LLL_PRIVATE != 0 addl $LLL_PRIVATE, %ecx #endif call __lll_unlock_wake jmp 4b /* Locking in loop failed. */ 5: #if cond_lock == 0 movl %ebx, %edx #else leal cond_lock(%ebx), %edx #endif #if (LLL_SHARED-LLL_PRIVATE) > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex(%ebx) setne %cl subl $1, %ecx andl $(LLL_SHARED-LLL_PRIVATE), %ecx #if LLL_PRIVATE != 0 addl $LLL_PRIVATE, %ecx #endif call __lll_lock_wait jmp 6b /* Unlock after loop requires wakeup. */ 10: #if cond_lock == 0 movl %ebx, %eax #else leal cond_lock(%ebx), %eax #endif #if (LLL_SHARED-LLL_PRIVATE) > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex(%ebx) setne %cl subl $1, %ecx andl $(LLL_SHARED-LLL_PRIVATE), %ecx #if LLL_PRIVATE != 0 addl $LLL_PRIVATE, %ecx #endif call __lll_unlock_wake jmp 11b .size __pthread_cond_wait, .-__pthread_cond_wait weak_alias(__pthread_cond_wait, pthread_cond_wait) .type __condvar_w_cleanup2, @function __condvar_w_cleanup2: subl $cond_futex, %ebx .size __condvar_w_cleanup2, .-__condvar_w_cleanup2 .LSbl4: .type __condvar_w_cleanup, @function __condvar_w_cleanup: movl %eax, %esi /* Get internal lock. */ movl $1, %edx xorl %eax, %eax LOCK #if cond_lock == 0 cmpxchgl %edx, (%ebx) #else cmpxchgl %edx, cond_lock(%ebx) #endif jz 1f #if cond_lock == 0 movl %ebx, %edx #else leal cond_lock(%ebx), %edx #endif #if (LLL_SHARED-LLL_PRIVATE) > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex(%ebx) setne %cl subl $1, %ecx andl $(LLL_SHARED-LLL_PRIVATE), %ecx #if LLL_PRIVATE != 0 addl $LLL_PRIVATE, %ecx #endif call __lll_lock_wait 1: movl broadcast_seq(%ebx), %eax cmpl 12(%esp), %eax jne 3f /* We increment the wakeup_seq counter only if it is lower than total_seq. If this is not the case the thread was woken and then canceled. In this case we ignore the signal. */ movl total_seq(%ebx), %eax movl total_seq+4(%ebx), %edi cmpl wakeup_seq+4(%ebx), %edi jb 6f ja 7f cmpl wakeup_seq(%ebx), %eax jbe 7f 6: addl $1, wakeup_seq(%ebx) adcl $0, wakeup_seq+4(%ebx) addl $1, cond_futex(%ebx) 7: addl $1, woken_seq(%ebx) adcl $0, woken_seq+4(%ebx) 3: subl $(1 << nwaiters_shift), cond_nwaiters(%ebx) /* Wake up a thread which wants to destroy the condvar object. */ xorl %edi, %edi movl total_seq(%ebx), %eax andl total_seq+4(%ebx), %eax cmpl $0xffffffff, %eax jne 4f movl cond_nwaiters(%ebx), %eax andl $~((1 << nwaiters_shift) - 1), %eax jne 4f addl $cond_nwaiters, %ebx movl $SYS_futex, %eax #if FUTEX_PRIVATE_FLAG > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex-cond_nwaiters(%ebx) sete %cl subl $1, %ecx #ifdef __ASSUME_PRIVATE_FUTEX andl $FUTEX_PRIVATE_FLAG, %ecx #else andl %gs:PRIVATE_FUTEX, %ecx #endif addl $FUTEX_WAKE, %ecx movl $1, %edx ENTER_KERNEL subl $cond_nwaiters, %ebx movl $1, %edi 4: LOCK #if cond_lock == 0 subl $1, (%ebx) #else subl $1, cond_lock(%ebx) #endif je 2f #if cond_lock == 0 movl %ebx, %eax #else leal cond_lock(%ebx), %eax #endif #if (LLL_SHARED-LLL_PRIVATE) > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex(%ebx) setne %cl subl $1, %ecx andl $(LLL_SHARED-LLL_PRIVATE), %ecx #if LLL_PRIVATE != 0 addl $LLL_PRIVATE, %ecx #endif call __lll_unlock_wake /* Wake up all waiters to make sure no signal gets lost. */ 2: testl %edi, %edi jnz 5f addl $cond_futex, %ebx #if FUTEX_PRIVATE_FLAG > 255 xorl %ecx, %ecx #endif cmpl $-1, dep_mutex-cond_futex(%ebx) sete %cl subl $1, %ecx #ifdef __ASSUME_PRIVATE_FUTEX andl $FUTEX_PRIVATE_FLAG, %ecx #else andl %gs:PRIVATE_FUTEX, %ecx #endif addl $FUTEX_WAKE, %ecx movl $SYS_futex, %eax movl $0x7fffffff, %edx ENTER_KERNEL 5: movl 24+FRAME_SIZE(%esp), %eax call __pthread_mutex_cond_lock movl %esi, (%esp) .LcallUR: #ifdef __PIC__ call __i686.get_pc_thunk.bx addl $_GLOBAL_OFFSET_TABLE_, %ebx #endif call _Unwind_Resume@PLT hlt .LENDCODE: cfi_endproc .size __condvar_w_cleanup, .-__condvar_w_cleanup .section .gcc_except_table,"a",@progbits .LexceptSTART: .byte DW_EH_PE_omit # @LPStart format (omit) .byte DW_EH_PE_omit # @TType format (omit) .byte DW_EH_PE_sdata4 # call-site format # DW_EH_PE_sdata4 .uleb128 .Lcstend-.Lcstbegin .Lcstbegin: .long .LcleanupSTART-.LSTARTCODE .long .Ladd_cond_futex-.LcleanupSTART .long __condvar_w_cleanup-.LSTARTCODE .uleb128 0 .long .Ladd_cond_futex-.LSTARTCODE .long .Lsub_cond_futex-.Ladd_cond_futex .long __condvar_w_cleanup2-.LSTARTCODE .uleb128 0 .long .Lsub_cond_futex-.LSTARTCODE .long .LcleanupEND-.Lsub_cond_futex .long __condvar_w_cleanup-.LSTARTCODE .uleb128 0 .long .LcallUR-.LSTARTCODE .long .LENDCODE-.LcallUR .long 0 .uleb128 0 .Lcstend: #ifdef __PIC__ .section .gnu.linkonce.t.__i686.get_pc_thunk.bx,"ax",@progbits .globl __i686.get_pc_thunk.bx .hidden __i686.get_pc_thunk.bx .type __i686.get_pc_thunk.bx,@function __i686.get_pc_thunk.bx: movl (%esp), %ebx; ret .size __i686.get_pc_thunk.bx,.-__i686.get_pc_thunk.bx #endif #ifdef SHARED .hidden DW.ref.__gcc_personality_v0 .weak DW.ref.__gcc_personality_v0 .section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits .align 4 .type DW.ref.__gcc_personality_v0, @object .size DW.ref.__gcc_personality_v0, 4 DW.ref.__gcc_personality_v0: .long __gcc_personality_v0 #endif |