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Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h b/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h new file mode 100644 index 0000000000..cbf6597e00 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/x86_64/lowlevellock.h @@ -0,0 +1,278 @@ +/* Copyright (C) 2002-2017 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 + +#include <lowlevellock-futex.h> + +/* XXX Remove when no assembler code uses futexes anymore. */ +#define SYS_futex __NR_futex + +#ifndef __ASSEMBLER__ + +/* Initializer for lock. */ +#define LLL_LOCK_INITIALIZER (0) +#define LLL_LOCK_INITIALIZER_LOCKED (1) +#define LLL_LOCK_INITIALIZER_WAITERS (2) + + +/* 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 !IS_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_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 !IS_IN (libc) || defined UP +# define __lll_lock_asm_start LOCK_INSTR "cmpxchgl %4, %2\n\t" \ + "jz 24f\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" \ + "jz 24f\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 \ + "1:\tlea %2, %%" RDI_LP "\n" \ + "2:\tsub $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset 128\n" \ + "3:\tcallq __lll_lock_wait_private\n" \ + "4:\tadd $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset -128\n" \ + "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 \ + "1:\tlea %2, %%" RDI_LP "\n" \ + "2:\tsub $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset 128\n" \ + "3:\tcallq __lll_lock_wait\n" \ + "4:\tadd $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset -128\n" \ + "24:" \ + : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ + "=a" (ignore3) \ + : "1" (1), "m" (futex), "3" (0), "0" (private) \ + : "cx", "r11", "cc", "memory"); \ + }) \ + +#define lll_cond_lock(futex, private) \ + (void) \ + ({ int ignore1, ignore2, ignore3; \ + __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t" \ + "jz 24f\n" \ + "1:\tlea %2, %%" RDI_LP "\n" \ + "2:\tsub $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset 128\n" \ + "3:\tcallq __lll_lock_wait\n" \ + "4:\tadd $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset -128\n" \ + "24:" \ + : "=S" (ignore1), "=D" (ignore2), "=m" (futex), \ + "=a" (ignore3) \ + : "1" (2), "m" (futex), "3" (0), "0" (private) \ + : "cx", "r11", "cc", "memory"); \ + }) + +#define lll_timedlock(futex, timeout, private) \ + ({ int result, ignore1, ignore2, ignore3; \ + __asm __volatile (LOCK_INSTR "cmpxchgl %1, %4\n\t" \ + "jz 24f\n" \ + "1:\tlea %4, %%" RDI_LP "\n" \ + "0:\tmov %8, %%" RDX_LP "\n" \ + "2:\tsub $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset 128\n" \ + "3:\tcallq __lll_timedlock_wait\n" \ + "4:\tadd $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset -128\n" \ + "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; }) + +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) + +#if !IS_IN (libc) || defined UP +# define __lll_unlock_asm_start LOCK_INSTR "decl %0\n\t" \ + "je 24f\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" \ + "je 24f\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 \ + "1:\tlea %0, %%" RDI_LP "\n" \ + "2:\tsub $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset 128\n" \ + "3:\tcallq __lll_unlock_wake_private\n" \ + "4:\tadd $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset -128\n" \ + "24:" \ + : "=m" (futex), "=&D" (ignore) \ + : "m" (futex) \ + : "ax", "cx", "r11", "cc", "memory"); \ + else \ + __asm __volatile (__lll_unlock_asm_start \ + "1:\tlea %0, %%" RDI_LP "\n" \ + "2:\tsub $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset 128\n" \ + "3:\tcallq __lll_unlock_wake\n" \ + "4:\tadd $128, %%" RSP_LP "\n" \ + ".cfi_adjust_cfa_offset -128\n" \ + "24:" \ + : "=m" (futex), "=&D" (ignore) \ + : "m" (futex), "S" (private) \ + : "ax", "cx", "r11", "cc", "memory"); \ + }) + +#define lll_islocked(futex) \ + (futex != LLL_LOCK_INITIALIZER) + + +/* The kernel notifies a process which uses CLONE_CHILD_CLEARTID via futex + wake-up when the clone terminates. The memory location contains the + thread ID while the clone is running and is reset to zero by the kernel + afterwards. The kernel up to version 3.16.3 does not use the private futex + operations for futex wake-up when the clone terminates. */ +#define lll_wait_tid(tid) \ + do { \ + __typeof (tid) __tid; \ + while ((__tid = (tid)) != 0) \ + lll_futex_wait (&(tid), __tid, LLL_SHARED);\ + } while (0) + +extern int __lll_timedwait_tid (int *, const struct timespec *) + attribute_hidden; + +/* As lll_wait_tid, but with a timeout. If the timeout occurs then return + ETIMEDOUT. If ABSTIME is invalid, return EINVAL. + XXX Note that this differs from the generic version in that we do the + error checking here and not in __lll_timedwait_tid. */ +#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, adapt_count, private) \ + __lll_unlock_elision (&(futex), private) +#define lll_trylock_elision(futex, adapt_count) \ + __lll_trylock_elision (&(futex), &(adapt_count)) + +#endif /* !__ASSEMBLER__ */ + +#endif /* lowlevellock.h */ |