| /* Copyright (C) 2002-2014 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 |
| |
| #include <stap-probe.h> |
| |
| #ifndef __ASSEMBLER__ |
| # include <time.h> |
| # include <sys/param.h> |
| # include <bits/pthreadtypes.h> |
| # include <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 SYS_futex 240 |
| #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 |
| |
| |
| #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 %%gs:%P1, %0" : "+r" (__fl) \ |
| : "i" (offsetof (struct pthread, header.private_futex))); \ |
| __fl | (fl); })) |
| # endif |
| #endif |
| |
| #ifndef __ASSEMBLER__ |
| |
| /* Initializer for compatibility lock. */ |
| #define LLL_LOCK_INITIALIZER (0) |
| #define LLL_LOCK_INITIALIZER_LOCKED (1) |
| #define LLL_LOCK_INITIALIZER_WAITERS (2) |
| |
| |
| #ifdef PIC |
| # define LLL_EBX_LOAD "xchgl %2, %%ebx\n" |
| # define LLL_EBX_REG "D" |
| #else |
| # define LLL_EBX_LOAD |
| # define LLL_EBX_REG "b" |
| #endif |
| |
| #ifdef I386_USE_SYSENTER |
| # ifdef SHARED |
| # define LLL_ENTER_KERNEL "call *%%gs:%P6\n\t" |
| # else |
| # define LLL_ENTER_KERNEL "call *_dl_sysinfo\n\t" |
| # endif |
| #else |
| # define LLL_ENTER_KERNEL "int $0x80\n\t" |
| #endif |
| |
| /* Delay in spinlock loop. */ |
| #define BUSY_WAIT_NOP asm ("rep; nop") |
| |
| |
| #define LLL_STUB_UNWIND_INFO_START \ |
| ".section .eh_frame,\"a\",@progbits\n" \ |
| "5:\t" ".long 7f-6f # Length of Common Information Entry\n" \ |
| "6:\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 -4 # CIE Data Alignment Factor\n\t" \ |
| ".byte 0x8 # CIE RA Column\n\t" \ |
| ".uleb128 0x1 # Augmentation size\n\t" \ |
| ".byte 0x1b # FDE Encoding (pcrel sdata4)\n\t" \ |
| ".byte 0xc # DW_CFA_def_cfa\n\t" \ |
| ".uleb128 0x4\n\t" \ |
| ".uleb128 0x0\n\t" \ |
| ".align 4\n" \ |
| "7:\t" ".long 17f-8f # FDE Length\n" \ |
| "8:\t" ".long 8b-5b # FDE CIE offset\n\t" \ |
| ".long 1b-. # FDE initial location\n\t" \ |
| ".long 4b-1b # FDE address range\n\t" \ |
| ".uleb128 0x0 # Augmentation size\n\t" \ |
| ".byte 0x16 # DW_CFA_val_expression\n\t" \ |
| ".uleb128 0x8\n\t" \ |
| ".uleb128 10f-9f\n" \ |
| "9:\t" ".byte 0x78 # DW_OP_breg8\n\t" \ |
| ".sleb128 3b-1b\n" |
| #define LLL_STUB_UNWIND_INFO_END \ |
| ".byte 0x16 # DW_CFA_val_expression\n\t" \ |
| ".uleb128 0x8\n\t" \ |
| ".uleb128 12f-11f\n" \ |
| "11:\t" ".byte 0x78 # DW_OP_breg8\n\t" \ |
| ".sleb128 3b-2b\n" \ |
| "12:\t" ".byte 0x40 + (3b-2b-1) # DW_CFA_advance_loc\n\t" \ |
| ".byte 0x16 # DW_CFA_val_expression\n\t" \ |
| ".uleb128 0x8\n\t" \ |
| ".uleb128 16f-13f\n" \ |
| "13:\t" ".byte 0x78 # DW_OP_breg8\n\t" \ |
| ".sleb128 15f-14f\n\t" \ |
| ".byte 0x0d # DW_OP_const4s\n" \ |
| "14:\t" ".4byte 3b-.\n\t" \ |
| ".byte 0x1c # DW_OP_minus\n\t" \ |
| ".byte 0x0d # DW_OP_const4s\n" \ |
| "15:\t" ".4byte 18f-.\n\t" \ |
| ".byte 0x22 # DW_OP_plus\n" \ |
| "16:\t" ".align 4\n" \ |
| "17:\t" ".previous\n" |
| |
| /* Unwind info for |
| 1: lea ..., ... |
| 2: call ... |
| 3: jmp 18f |
| 4: |
| snippet. */ |
| #define LLL_STUB_UNWIND_INFO_3 \ |
| LLL_STUB_UNWIND_INFO_START \ |
| "10:\t" ".byte 0x40 + (2b-1b) # DW_CFA_advance_loc\n\t" \ |
| LLL_STUB_UNWIND_INFO_END |
| |
| /* Unwind info for |
| 1: lea ..., ... |
| 0: movl ..., ... |
| 2: call ... |
| 3: jmp 18f |
| 4: |
| snippet. */ |
| #define LLL_STUB_UNWIND_INFO_4 \ |
| LLL_STUB_UNWIND_INFO_START \ |
| "10:\t" ".byte 0x40 + (0b-1b) # DW_CFA_advance_loc\n\t" \ |
| ".byte 0x16 # DW_CFA_val_expression\n\t" \ |
| ".uleb128 0x8\n\t" \ |
| ".uleb128 20f-19f\n" \ |
| "19:\t" ".byte 0x78 # DW_OP_breg8\n\t" \ |
| ".sleb128 3b-0b\n" \ |
| "20:\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) \ |
| ({ \ |
| int __status; \ |
| register __typeof (val) _val asm ("edx") = (val); \ |
| __asm __volatile (LLL_EBX_LOAD \ |
| LLL_ENTER_KERNEL \ |
| LLL_EBX_LOAD \ |
| : "=a" (__status) \ |
| : "0" (SYS_futex), LLL_EBX_REG (futex), "S" (timeout), \ |
| "c" (__lll_private_flag (FUTEX_WAIT, private)), \ |
| "d" (_val), "i" (offsetof (tcbhead_t, sysinfo)) \ |
| : "memory"); \ |
| __status; \ |
| }) |
| |
| |
| #define lll_futex_wake(futex, nr, private) \ |
| ({ \ |
| int __status; \ |
| register __typeof (nr) _nr asm ("edx") = (nr); \ |
| LIBC_PROBE (lll_futex_wake, 3, futex, nr, private); \ |
| __asm __volatile (LLL_EBX_LOAD \ |
| LLL_ENTER_KERNEL \ |
| LLL_EBX_LOAD \ |
| : "=a" (__status) \ |
| : "0" (SYS_futex), LLL_EBX_REG (futex), \ |
| "c" (__lll_private_flag (FUTEX_WAKE, private)), \ |
| "d" (_nr), \ |
| "i" (0) /* phony, to align next arg's number */, \ |
| "i" (offsetof (tcbhead_t, sysinfo))); \ |
| __status; \ |
| }) |
| |
| |
| /* 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, %%gs:%P5\n\t" \ |
| "je 0f\n\t" \ |
| "lock\n" \ |
| "0:\tcmpxchgl %2, %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), \ |
| "i" (MULTIPLE_THREADS_OFFSET) \ |
| : "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 %1, %2\n\t" |
| #else |
| # define __lll_lock_asm_start "cmpl $0, %%gs:%P6\n\t" \ |
| "je 0f\n\t" \ |
| "lock\n" \ |
| "0:\tcmpxchgl %1, %2\n\t" |
| #endif |
| |
| #define lll_lock(futex, private) \ |
| (void) \ |
| ({ int ignore1, ignore2; \ |
| if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ |
| __asm __volatile (__lll_lock_asm_start \ |
| "jnz _L_lock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_lock_%=,@function\n" \ |
| "_L_lock_%=:\n" \ |
| "1:\tleal %2, %%ecx\n" \ |
| "2:\tcall __lll_lock_wait_private\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_lock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_3 \ |
| "18:" \ |
| : "=a" (ignore1), "=c" (ignore2), "=m" (futex) \ |
| : "0" (0), "1" (1), "m" (futex), \ |
| "i" (MULTIPLE_THREADS_OFFSET) \ |
| : "memory"); \ |
| else \ |
| { \ |
| int ignore3; \ |
| __asm __volatile (__lll_lock_asm_start \ |
| "jnz _L_lock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_lock_%=,@function\n" \ |
| "_L_lock_%=:\n" \ |
| "1:\tleal %2, %%edx\n" \ |
| "0:\tmovl %8, %%ecx\n" \ |
| "2:\tcall __lll_lock_wait\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_lock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_4 \ |
| "18:" \ |
| : "=a" (ignore1), "=c" (ignore2), \ |
| "=m" (futex), "=&d" (ignore3) \ |
| : "1" (1), "m" (futex), \ |
| "i" (MULTIPLE_THREADS_OFFSET), "0" (0), \ |
| "g" ((int) (private)) \ |
| : "memory"); \ |
| } \ |
| }) |
| |
| #define lll_robust_lock(futex, id, private) \ |
| ({ int result, ignore1, ignore2; \ |
| __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \ |
| "jnz _L_robust_lock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_robust_lock_%=,@function\n" \ |
| "_L_robust_lock_%=:\n" \ |
| "1:\tleal %2, %%edx\n" \ |
| "0:\tmovl %7, %%ecx\n" \ |
| "2:\tcall __lll_robust_lock_wait\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_robust_lock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_4 \ |
| "18:" \ |
| : "=a" (result), "=c" (ignore1), "=m" (futex), \ |
| "=&d" (ignore2) \ |
| : "0" (0), "1" (id), "m" (futex), "g" ((int) (private))\ |
| : "memory"); \ |
| result; }) |
| |
| |
| /* Special version of lll_lock which causes the unlock function to |
| always wakeup waiters. */ |
| #define lll_cond_lock(futex, private) \ |
| (void) \ |
| ({ int ignore1, ignore2, ignore3; \ |
| __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \ |
| "jnz _L_cond_lock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_cond_lock_%=,@function\n" \ |
| "_L_cond_lock_%=:\n" \ |
| "1:\tleal %2, %%edx\n" \ |
| "0:\tmovl %7, %%ecx\n" \ |
| "2:\tcall __lll_lock_wait\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_cond_lock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_4 \ |
| "18:" \ |
| : "=a" (ignore1), "=c" (ignore2), "=m" (futex), \ |
| "=&d" (ignore3) \ |
| : "0" (0), "1" (2), "m" (futex), "g" ((int) (private))\ |
| : "memory"); \ |
| }) |
| |
| |
| #define lll_robust_cond_lock(futex, id, private) \ |
| ({ int result, ignore1, ignore2; \ |
| __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \ |
| "jnz _L_robust_cond_lock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_robust_cond_lock_%=,@function\n" \ |
| "_L_robust_cond_lock_%=:\n" \ |
| "1:\tleal %2, %%edx\n" \ |
| "0:\tmovl %7, %%ecx\n" \ |
| "2:\tcall __lll_robust_lock_wait\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_robust_cond_lock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_4 \ |
| "18:" \ |
| : "=a" (result), "=c" (ignore1), "=m" (futex), \ |
| "=&d" (ignore2) \ |
| : "0" (0), "1" (id | FUTEX_WAITERS), "m" (futex), \ |
| "g" ((int) (private)) \ |
| : "memory"); \ |
| result; }) |
| |
| |
| #define lll_timedlock(futex, timeout, private) \ |
| ({ int result, ignore1, ignore2, ignore3; \ |
| __asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \ |
| "jnz _L_timedlock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_timedlock_%=,@function\n" \ |
| "_L_timedlock_%=:\n" \ |
| "1:\tleal %3, %%ecx\n" \ |
| "0:\tmovl %8, %%edx\n" \ |
| "2:\tcall __lll_timedlock_wait\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_timedlock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_4 \ |
| "18:" \ |
| : "=a" (result), "=c" (ignore1), "=&d" (ignore2), \ |
| "=m" (futex), "=S" (ignore3) \ |
| : "0" (0), "1" (1), "m" (futex), "m" (timeout), \ |
| "4" ((int) (private)) \ |
| : "memory"); \ |
| result; }) |
| |
| extern int __lll_timedlock_elision (int *futex, short *adapt_count, |
| const struct timespec *timeout, |
| int private) attribute_hidden; |
| |
| #define lll_timedlock_elision(futex, adapt_count, timeout, private) \ |
| __lll_timedlock_elision(&(futex), &(adapt_count), timeout, private) |
| |
| #define lll_robust_timedlock(futex, timeout, id, private) \ |
| ({ int result, ignore1, ignore2, ignore3; \ |
| __asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \ |
| "jnz _L_robust_timedlock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_robust_timedlock_%=,@function\n" \ |
| "_L_robust_timedlock_%=:\n" \ |
| "1:\tleal %3, %%ecx\n" \ |
| "0:\tmovl %8, %%edx\n" \ |
| "2:\tcall __lll_robust_timedlock_wait\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_robust_timedlock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_4 \ |
| "18:" \ |
| : "=a" (result), "=c" (ignore1), "=&d" (ignore2), \ |
| "=m" (futex), "=S" (ignore3) \ |
| : "0" (0), "1" (id), "m" (futex), "m" (timeout), \ |
| "4" ((int) (private)) \ |
| : "memory"); \ |
| result; }) |
| |
| #if defined NOT_IN_libc || defined UP |
| # define __lll_unlock_asm LOCK_INSTR "subl $1, %0\n\t" |
| #else |
| # define __lll_unlock_asm "cmpl $0, %%gs:%P3\n\t" \ |
| "je 0f\n\t" \ |
| "lock\n" \ |
| "0:\tsubl $1,%0\n\t" |
| #endif |
| |
| #define lll_unlock(futex, private) \ |
| (void) \ |
| ({ int ignore; \ |
| if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ |
| __asm __volatile (__lll_unlock_asm \ |
| "jne _L_unlock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_unlock_%=,@function\n" \ |
| "_L_unlock_%=:\n" \ |
| "1:\tleal %0, %%eax\n" \ |
| "2:\tcall __lll_unlock_wake_private\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_unlock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_3 \ |
| "18:" \ |
| : "=m" (futex), "=&a" (ignore) \ |
| : "m" (futex), "i" (MULTIPLE_THREADS_OFFSET) \ |
| : "memory"); \ |
| else \ |
| { \ |
| int ignore2; \ |
| __asm __volatile (__lll_unlock_asm \ |
| "jne _L_unlock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_unlock_%=,@function\n" \ |
| "_L_unlock_%=:\n" \ |
| "1:\tleal %0, %%eax\n" \ |
| "0:\tmovl %5, %%ecx\n" \ |
| "2:\tcall __lll_unlock_wake\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_unlock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_4 \ |
| "18:" \ |
| : "=m" (futex), "=&a" (ignore), "=&c" (ignore2) \ |
| : "i" (MULTIPLE_THREADS_OFFSET), "m" (futex), \ |
| "g" ((int) (private)) \ |
| : "memory"); \ |
| } \ |
| }) |
| |
| #define lll_robust_unlock(futex, private) \ |
| (void) \ |
| ({ int ignore, ignore2; \ |
| __asm __volatile (LOCK_INSTR "andl %3, %0\n\t" \ |
| "jne _L_robust_unlock_%=\n\t" \ |
| ".subsection 1\n\t" \ |
| ".type _L_robust_unlock_%=,@function\n" \ |
| "_L_robust_unlock_%=:\n\t" \ |
| "1:\tleal %0, %%eax\n" \ |
| "0:\tmovl %5, %%ecx\n" \ |
| "2:\tcall __lll_unlock_wake\n" \ |
| "3:\tjmp 18f\n" \ |
| "4:\t.size _L_robust_unlock_%=, 4b-1b\n\t" \ |
| ".previous\n" \ |
| LLL_STUB_UNWIND_INFO_4 \ |
| "18:" \ |
| : "=m" (futex), "=&a" (ignore), "=&c" (ignore2) \ |
| : "i" (FUTEX_WAITERS), "m" (futex), \ |
| "g" ((int) (private)) \ |
| : "memory"); \ |
| }) |
| |
| |
| #define lll_robust_dead(futex, private) \ |
| (void) \ |
| ({ int __ignore; \ |
| register int _nr asm ("edx") = 1; \ |
| __asm __volatile (LOCK_INSTR "orl %5, (%2)\n\t" \ |
| LLL_EBX_LOAD \ |
| LLL_ENTER_KERNEL \ |
| LLL_EBX_LOAD \ |
| : "=a" (__ignore) \ |
| : "0" (SYS_futex), LLL_EBX_REG (&(futex)), \ |
| "c" (__lll_private_flag (FUTEX_WAKE, private)), \ |
| "d" (_nr), "i" (FUTEX_OWNER_DIED), \ |
| "i" (offsetof (tcbhead_t, sysinfo))); \ |
| }) |
| |
| #define lll_islocked(futex) \ |
| (futex != LLL_LOCK_INITIALIZER) |
| |
| /* The kernel notifies a process which uses CLONE_CHILD_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 (LLL_EBX_LOAD \ |
| "1:\tmovl %1, %%eax\n\t" \ |
| LLL_ENTER_KERNEL \ |
| "cmpl $0, (%%ebx)\n\t" \ |
| "jne 1b\n\t" \ |
| LLL_EBX_LOAD \ |
| : "=&a" (__ignore) \ |
| : "i" (SYS_futex), LLL_EBX_REG (&tid), "S" (0), \ |
| "c" (FUTEX_WAIT), "d" (_tid), \ |
| "i" (offsetof (tcbhead_t, sysinfo)) \ |
| : "memory"); \ |
| } while (0) |
| |
| extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime) |
| __attribute__ ((regparm (2))) attribute_hidden; |
| #define lll_timedwait_tid(tid, abstime) \ |
| ({ \ |
| int __result = 0; \ |
| if (tid != 0) \ |
| { \ |
| if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \ |
| __result = EINVAL; \ |
| else \ |
| __result = __lll_timedwait_tid (&tid, abstime); \ |
| } \ |
| __result; }) |
| |
| extern int __lll_lock_elision (int *futex, short *adapt_count, int private) |
| attribute_hidden; |
| |
| extern int __lll_unlock_elision(int *lock, int private) |
| attribute_hidden; |
| |
| extern int __lll_trylock_elision(int *lock, short *adapt_count) |
| attribute_hidden; |
| |
| #define lll_lock_elision(futex, adapt_count, private) \ |
| __lll_lock_elision (&(futex), &(adapt_count), private) |
| #define lll_unlock_elision(futex, private) \ |
| __lll_unlock_elision (&(futex), private) |
| #define lll_trylock_elision(futex, adapt_count) \ |
| __lll_trylock_elision(&(futex), &(adapt_count)) |
| |
| #endif /* !__ASSEMBLER__ */ |
| |
| #endif /* lowlevellock.h */ |