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602 lines
21 KiB
C
602 lines
21 KiB
C
/* Copyright (C) 2002-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _LOWLEVELLOCK_H
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#define _LOWLEVELLOCK_H 1
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#include <stap-probe.h>
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#ifndef __ASSEMBLER__
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# include <time.h>
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# include <sys/param.h>
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# include <bits/pthreadtypes.h>
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# include <kernel-features.h>
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# include <tcb-offsets.h>
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# ifndef LOCK_INSTR
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# ifdef UP
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# define LOCK_INSTR /* nothing */
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# else
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# define LOCK_INSTR "lock;"
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# endif
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# endif
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#else
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# ifndef LOCK
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# ifdef UP
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# define LOCK
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# else
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# define LOCK lock
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# endif
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# endif
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#endif
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#define SYS_futex __NR_futex
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_CMP_REQUEUE 4
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#define FUTEX_WAKE_OP 5
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#define FUTEX_LOCK_PI 6
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#define FUTEX_UNLOCK_PI 7
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#define FUTEX_TRYLOCK_PI 8
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#define FUTEX_WAIT_BITSET 9
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#define FUTEX_WAKE_BITSET 10
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#define FUTEX_WAIT_REQUEUE_PI 11
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#define FUTEX_CMP_REQUEUE_PI 12
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#define FUTEX_PRIVATE_FLAG 128
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#define FUTEX_CLOCK_REALTIME 256
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#define FUTEX_BITSET_MATCH_ANY 0xffffffff
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#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
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/* Values for 'private' parameter of locking macros. Yes, the
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definition seems to be backwards. But it is not. The bit will be
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reversed before passing to the system call. */
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#define LLL_PRIVATE 0
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#define LLL_SHARED FUTEX_PRIVATE_FLAG
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#ifndef __ASSEMBLER__
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#if !defined NOT_IN_libc || defined IS_IN_rtld
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/* In libc.so or ld.so all futexes are private. */
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# ifdef __ASSUME_PRIVATE_FUTEX
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# define __lll_private_flag(fl, private) \
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((fl) | FUTEX_PRIVATE_FLAG)
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# else
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# define __lll_private_flag(fl, private) \
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((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
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# endif
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#else
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# ifdef __ASSUME_PRIVATE_FUTEX
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# define __lll_private_flag(fl, private) \
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(((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
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# else
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# define __lll_private_flag(fl, private) \
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(__builtin_constant_p (private) \
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? ((private) == 0 \
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? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \
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: (fl)) \
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: ({ unsigned int __fl = ((private) ^ FUTEX_PRIVATE_FLAG); \
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asm ("andl %%fs:%P1, %0" : "+r" (__fl) \
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: "i" (offsetof (struct pthread, header.private_futex))); \
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__fl | (fl); }))
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# endif
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#endif
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/* Initializer for lock. */
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#define LLL_LOCK_INITIALIZER (0)
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#define LLL_LOCK_INITIALIZER_LOCKED (1)
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#define LLL_LOCK_INITIALIZER_WAITERS (2)
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/* Delay in spinlock loop. */
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#define BUSY_WAIT_NOP asm ("rep; nop")
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#define LLL_STUB_UNWIND_INFO_START \
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".section .eh_frame,\"a\",@progbits\n" \
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"7:\t" ".long 9f-8f # Length of Common Information Entry\n" \
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"8:\t" ".long 0x0 # CIE Identifier Tag\n\t" \
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".byte 0x1 # CIE Version\n\t" \
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".ascii \"zR\\0\" # CIE Augmentation\n\t" \
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".uleb128 0x1 # CIE Code Alignment Factor\n\t" \
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".sleb128 -8 # CIE Data Alignment Factor\n\t" \
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".byte 0x10 # CIE RA Column\n\t" \
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".uleb128 0x1 # Augmentation size\n\t" \
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".byte 0x1b # FDE Encoding (pcrel sdata4)\n\t" \
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".byte 0x12 # DW_CFA_def_cfa_sf\n\t" \
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".uleb128 0x7\n\t" \
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".sleb128 16\n\t" \
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".align " LP_SIZE "\n" \
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"9:\t" ".long 23f-10f # FDE Length\n" \
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"10:\t" ".long 10b-7b # FDE CIE offset\n\t" \
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".long 1b-. # FDE initial location\n\t" \
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".long 6b-1b # FDE address range\n\t" \
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".uleb128 0x0 # Augmentation size\n\t" \
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".byte 0x16 # DW_CFA_val_expression\n\t" \
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".uleb128 0x10\n\t" \
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".uleb128 12f-11f\n" \
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"11:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
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".sleb128 4b-1b\n"
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#define LLL_STUB_UNWIND_INFO_END \
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".byte 0x16 # DW_CFA_val_expression\n\t" \
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".uleb128 0x10\n\t" \
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".uleb128 14f-13f\n" \
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"13:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
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".sleb128 4b-2b\n" \
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"14:\t" ".byte 0x40 + (3b-2b) # DW_CFA_advance_loc\n\t" \
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".byte 0x0e # DW_CFA_def_cfa_offset\n\t" \
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".uleb128 0\n\t" \
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".byte 0x16 # DW_CFA_val_expression\n\t" \
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".uleb128 0x10\n\t" \
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".uleb128 16f-15f\n" \
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"15:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
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".sleb128 4b-3b\n" \
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"16:\t" ".byte 0x40 + (4b-3b-1) # DW_CFA_advance_loc\n\t" \
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".byte 0x0e # DW_CFA_def_cfa_offset\n\t" \
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".uleb128 128\n\t" \
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".byte 0x16 # DW_CFA_val_expression\n\t" \
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".uleb128 0x10\n\t" \
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".uleb128 20f-17f\n" \
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"17:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
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".sleb128 19f-18f\n\t" \
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".byte 0x0d # DW_OP_const4s\n" \
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"18:\t" ".4byte 4b-.\n\t" \
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".byte 0x1c # DW_OP_minus\n\t" \
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".byte 0x0d # DW_OP_const4s\n" \
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"19:\t" ".4byte 24f-.\n\t" \
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".byte 0x22 # DW_OP_plus\n" \
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"20:\t" ".byte 0x40 + (5b-4b+1) # DW_CFA_advance_loc\n\t" \
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".byte 0x13 # DW_CFA_def_cfa_offset_sf\n\t" \
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".sleb128 16\n\t" \
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".byte 0x16 # DW_CFA_val_expression\n\t" \
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".uleb128 0x10\n\t" \
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".uleb128 22f-21f\n" \
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"21:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
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".sleb128 4b-5b\n" \
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"22:\t" ".align " LP_SIZE "\n" \
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"23:\t" ".previous\n"
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/* Unwind info for
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1: leaq ..., %rdi
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2: subq $128, %rsp
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3: callq ...
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4: addq $128, %rsp
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5: jmp 24f
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6:
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snippet. */
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#define LLL_STUB_UNWIND_INFO_5 \
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LLL_STUB_UNWIND_INFO_START \
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"12:\t" ".byte 0x40 + (2b-1b) # DW_CFA_advance_loc\n\t" \
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LLL_STUB_UNWIND_INFO_END
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/* Unwind info for
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1: leaq ..., %rdi
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0: movq ..., %rdx
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2: subq $128, %rsp
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3: callq ...
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4: addq $128, %rsp
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5: jmp 24f
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6:
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snippet. */
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#define LLL_STUB_UNWIND_INFO_6 \
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LLL_STUB_UNWIND_INFO_START \
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"12:\t" ".byte 0x40 + (0b-1b) # DW_CFA_advance_loc\n\t" \
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".byte 0x16 # DW_CFA_val_expression\n\t" \
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".uleb128 0x10\n\t" \
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".uleb128 26f-25f\n" \
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"25:\t" ".byte 0x80 # DW_OP_breg16\n\t" \
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".sleb128 4b-0b\n" \
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"26:\t" ".byte 0x40 + (2b-0b) # DW_CFA_advance_loc\n\t" \
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LLL_STUB_UNWIND_INFO_END
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#define lll_futex_wait(futex, val, private) \
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lll_futex_timed_wait(futex, val, NULL, private)
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#define lll_futex_timed_wait(futex, val, timeout, private) \
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({ \
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register const struct timespec *__to __asm ("r10") = timeout; \
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int __status; \
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register __typeof (val) _val __asm ("edx") = (val); \
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__asm __volatile ("syscall" \
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: "=a" (__status) \
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: "0" (SYS_futex), "D" (futex), \
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"S" (__lll_private_flag (FUTEX_WAIT, private)), \
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"d" (_val), "r" (__to) \
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: "memory", "cc", "r11", "cx"); \
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__status; \
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})
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#define lll_futex_wake(futex, nr, private) \
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do { \
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int __ignore; \
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register __typeof (nr) _nr __asm ("edx") = (nr); \
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LIBC_PROBE (lll_futex_wake, 3, futex, nr, private); \
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__asm __volatile ("syscall" \
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: "=a" (__ignore) \
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: "0" (SYS_futex), "D" (futex), \
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"S" (__lll_private_flag (FUTEX_WAKE, private)), \
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"d" (_nr) \
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: "memory", "cc", "r10", "r11", "cx"); \
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} while (0)
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/* NB: in the lll_trylock macro we simply return the value in %eax
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after the cmpxchg instruction. In case the operation succeded this
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value is zero. In case the operation failed, the cmpxchg instruction
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has loaded the current value of the memory work which is guaranteed
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to be nonzero. */
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#if defined NOT_IN_libc || defined UP
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# define __lll_trylock_asm LOCK_INSTR "cmpxchgl %2, %1"
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#else
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# define __lll_trylock_asm "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
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"je 0f\n\t" \
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"lock; cmpxchgl %2, %1\n\t" \
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"jmp 1f\n\t" \
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"0:\tcmpxchgl %2, %1\n\t" \
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"1:"
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#endif
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#define lll_trylock(futex) \
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({ int ret; \
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__asm __volatile (__lll_trylock_asm \
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: "=a" (ret), "=m" (futex) \
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: "r" (LLL_LOCK_INITIALIZER_LOCKED), "m" (futex), \
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"0" (LLL_LOCK_INITIALIZER) \
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: "memory"); \
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ret; })
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#define lll_robust_trylock(futex, id) \
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({ int ret; \
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__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
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: "=a" (ret), "=m" (futex) \
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: "r" (id), "m" (futex), "0" (LLL_LOCK_INITIALIZER) \
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: "memory"); \
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ret; })
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#define lll_cond_trylock(futex) \
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({ int ret; \
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__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
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: "=a" (ret), "=m" (futex) \
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: "r" (LLL_LOCK_INITIALIZER_WAITERS), \
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"m" (futex), "0" (LLL_LOCK_INITIALIZER) \
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: "memory"); \
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ret; })
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#if defined NOT_IN_libc || defined UP
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# define __lll_lock_asm_start LOCK_INSTR "cmpxchgl %4, %2\n\t" \
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"jnz 1f\n\t"
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#else
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# define __lll_lock_asm_start "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
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"je 0f\n\t" \
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"lock; cmpxchgl %4, %2\n\t" \
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"jnz 1f\n\t" \
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"jmp 24f\n" \
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"0:\tcmpxchgl %4, %2\n\t" \
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"jnz 1f\n\t"
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#endif
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#define lll_lock(futex, private) \
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(void) \
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({ int ignore1, ignore2, ignore3; \
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if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \
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__asm __volatile (__lll_lock_asm_start \
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".subsection 1\n\t" \
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".type _L_lock_%=, @function\n" \
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"_L_lock_%=:\n" \
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"1:\tlea %2, %%" RDI_LP "\n" \
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"2:\tsub $128, %%" RSP_LP "\n" \
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"3:\tcallq __lll_lock_wait_private\n" \
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"4:\tadd $128, %%" RSP_LP "\n" \
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"5:\tjmp 24f\n" \
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"6:\t.size _L_lock_%=, 6b-1b\n\t" \
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".previous\n" \
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LLL_STUB_UNWIND_INFO_5 \
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"24:" \
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: "=S" (ignore1), "=&D" (ignore2), "=m" (futex), \
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"=a" (ignore3) \
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: "0" (1), "m" (futex), "3" (0) \
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: "cx", "r11", "cc", "memory"); \
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else \
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__asm __volatile (__lll_lock_asm_start \
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".subsection 1\n\t" \
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".type _L_lock_%=, @function\n" \
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"_L_lock_%=:\n" \
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"1:\tlea %2, %%" RDI_LP "\n" \
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"2:\tsub $128, %%" RSP_LP "\n" \
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"3:\tcallq __lll_lock_wait\n" \
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"4:\tadd $128, %%" RSP_LP "\n" \
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"5:\tjmp 24f\n" \
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"6:\t.size _L_lock_%=, 6b-1b\n\t" \
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".previous\n" \
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LLL_STUB_UNWIND_INFO_5 \
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"24:" \
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: "=S" (ignore1), "=D" (ignore2), "=m" (futex), \
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"=a" (ignore3) \
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: "1" (1), "m" (futex), "3" (0), "0" (private) \
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: "cx", "r11", "cc", "memory"); \
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}) \
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#define lll_robust_lock(futex, id, private) \
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({ int result, ignore1, ignore2; \
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__asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \
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"jnz 1f\n\t" \
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".subsection 1\n\t" \
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".type _L_robust_lock_%=, @function\n" \
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"_L_robust_lock_%=:\n" \
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"1:\tlea %2, %%" RDI_LP "\n" \
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"2:\tsub $128, %%" RSP_LP "\n" \
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"3:\tcallq __lll_robust_lock_wait\n" \
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"4:\tadd $128, %%" RSP_LP "\n" \
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"5:\tjmp 24f\n" \
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"6:\t.size _L_robust_lock_%=, 6b-1b\n\t" \
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".previous\n" \
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LLL_STUB_UNWIND_INFO_5 \
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"24:" \
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: "=S" (ignore1), "=D" (ignore2), "=m" (futex), \
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"=a" (result) \
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: "1" (id), "m" (futex), "3" (0), "0" (private) \
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: "cx", "r11", "cc", "memory"); \
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result; })
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#define lll_cond_lock(futex, private) \
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(void) \
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({ int ignore1, ignore2, ignore3; \
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__asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \
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"jnz 1f\n\t" \
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".subsection 1\n\t" \
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".type _L_cond_lock_%=, @function\n" \
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"_L_cond_lock_%=:\n" \
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"1:\tlea %2, %%" RDI_LP "\n" \
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"2:\tsub $128, %%" RSP_LP "\n" \
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"3:\tcallq __lll_lock_wait\n" \
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"4:\tadd $128, %%" RSP_LP "\n" \
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"5:\tjmp 24f\n" \
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"6:\t.size _L_cond_lock_%=, 6b-1b\n\t" \
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".previous\n" \
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LLL_STUB_UNWIND_INFO_5 \
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"24:" \
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: "=S" (ignore1), "=D" (ignore2), "=m" (futex), \
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"=a" (ignore3) \
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: "1" (2), "m" (futex), "3" (0), "0" (private) \
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: "cx", "r11", "cc", "memory"); \
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})
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#define lll_robust_cond_lock(futex, id, private) \
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({ int result, ignore1, ignore2; \
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__asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \
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"jnz 1f\n\t" \
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".subsection 1\n\t" \
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".type _L_robust_cond_lock_%=, @function\n" \
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"_L_robust_cond_lock_%=:\n" \
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"1:\tlea %2, %%" RDI_LP "\n" \
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"2:\tsub $128, %%" RSP_LP "\n" \
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"3:\tcallq __lll_robust_lock_wait\n" \
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"4:\tadd $128, %%" RSP_LP "\n" \
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"5:\tjmp 24f\n" \
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"6:\t.size _L_robust_cond_lock_%=, 6b-1b\n\t" \
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".previous\n" \
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LLL_STUB_UNWIND_INFO_5 \
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"24:" \
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: "=S" (ignore1), "=D" (ignore2), "=m" (futex), \
|
|
"=a" (result) \
|
|
: "1" (id | FUTEX_WAITERS), "m" (futex), "3" (0), \
|
|
"0" (private) \
|
|
: "cx", "r11", "cc", "memory"); \
|
|
result; })
|
|
|
|
#define lll_timedlock(futex, timeout, private) \
|
|
({ int result, 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:\tlea %4, %%" RDI_LP "\n" \
|
|
"0:\tmov %8, %%" RDX_LP "\n" \
|
|
"2:\tsub $128, %%" RSP_LP "\n" \
|
|
"3:\tcallq __lll_timedlock_wait\n" \
|
|
"4:\tadd $128, %%" RSP_LP "\n" \
|
|
"5:\tjmp 24f\n" \
|
|
"6:\t.size _L_timedlock_%=, 6b-1b\n\t" \
|
|
".previous\n" \
|
|
LLL_STUB_UNWIND_INFO_6 \
|
|
"24:" \
|
|
: "=a" (result), "=D" (ignore1), "=S" (ignore2), \
|
|
"=&d" (ignore3), "=m" (futex) \
|
|
: "0" (0), "1" (1), "m" (futex), "m" (timeout), \
|
|
"2" (private) \
|
|
: "memory", "cx", "cc", "r10", "r11"); \
|
|
result; })
|
|
|
|
#define lll_robust_timedlock(futex, timeout, id, private) \
|
|
({ int result, 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:\tlea %4, %%" RDI_LP "\n" \
|
|
"0:\tmov %8, %%" RDX_LP "\n" \
|
|
"2:\tsub $128, %%" RSP_LP "\n" \
|
|
"3:\tcallq __lll_robust_timedlock_wait\n" \
|
|
"4:\tadd $128, %%" RSP_LP "\n" \
|
|
"5:\tjmp 24f\n" \
|
|
"6:\t.size _L_robust_timedlock_%=, 6b-1b\n\t" \
|
|
".previous\n" \
|
|
LLL_STUB_UNWIND_INFO_6 \
|
|
"24:" \
|
|
: "=a" (result), "=D" (ignore1), "=S" (ignore2), \
|
|
"=&d" (ignore3), "=m" (futex) \
|
|
: "0" (0), "1" (id), "m" (futex), "m" (timeout), \
|
|
"2" (private) \
|
|
: "memory", "cx", "cc", "r10", "r11"); \
|
|
result; })
|
|
|
|
#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:\tlea %0, %%" RDI_LP "\n" \
|
|
"2:\tsub $128, %%" RSP_LP "\n" \
|
|
"3:\tcallq __lll_unlock_wake_private\n" \
|
|
"4:\tadd $128, %%" RSP_LP "\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:\tlea %0, %%" RDI_LP "\n" \
|
|
"2:\tsub $128, %%" RSP_LP "\n" \
|
|
"3:\tcallq __lll_unlock_wake\n" \
|
|
"4:\tadd $128, %%" RSP_LP "\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:\tlea %0, %%" RDI_LP "\n" \
|
|
"2:\tsub $128, %%" RSP_LP "\n" \
|
|
"3:\tcallq __lll_unlock_wake\n" \
|
|
"4:\tadd $128, %%" RSP_LP "\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 __result = 0; \
|
|
if (tid != 0) \
|
|
{ \
|
|
if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \
|
|
__result = EINVAL; \
|
|
else \
|
|
__result = __lll_timedwait_tid (&tid, abstime); \
|
|
} \
|
|
__result; })
|
|
|
|
#endif /* !__ASSEMBLER__ */
|
|
|
|
#endif /* lowlevellock.h */
|