diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/lowlevellock-futex.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/lowlevellock-futex.h | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/sysdeps/unix/sysv/linux/lowlevellock-futex.h b/sysdeps/unix/sysv/linux/lowlevellock-futex.h deleted file mode 100644 index b423673ed4..0000000000 --- a/sysdeps/unix/sysv/linux/lowlevellock-futex.h +++ /dev/null @@ -1,168 +0,0 @@ -/* Low-level locking access to futex facilities. Linux version. - Copyright (C) 2005-2019 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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 - <https://www.gnu.org/licenses/>. */ - -#ifndef _LOWLEVELLOCK_FUTEX_H -#define _LOWLEVELLOCK_FUTEX_H 1 - -#ifndef __ASSEMBLER__ -#include <sysdep.h> -#include <sysdep-cancel.h> -#include <kernel-features.h> -#endif - -#define FUTEX_WAIT 0 -#define FUTEX_WAKE 1 -#define FUTEX_REQUEUE 3 -#define FUTEX_CMP_REQUEUE 4 -#define FUTEX_WAKE_OP 5 -#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1) -#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 - -/* 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 IS_IN (libc) || IS_IN (rtld) -/* In libc.so or ld.so all futexes are private. */ -# define __lll_private_flag(fl, private) \ - ({ \ - /* Prevent warnings in callers of this macro. */ \ - int __lll_private_flag_priv __attribute__ ((unused)); \ - __lll_private_flag_priv = (private); \ - ((fl) | FUTEX_PRIVATE_FLAG); \ - }) -#else -# define __lll_private_flag(fl, private) \ - (((fl) | FUTEX_PRIVATE_FLAG) ^ (private)) -#endif - -#define lll_futex_syscall(nargs, futexp, op, ...) \ - ({ \ - INTERNAL_SYSCALL_DECL (__err); \ - long int __ret = INTERNAL_SYSCALL (futex, __err, nargs, futexp, op, \ - __VA_ARGS__); \ - (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (__ret, __err)) \ - ? -INTERNAL_SYSCALL_ERRNO (__ret, __err) : 0); \ - }) - -#define lll_futex_wait(futexp, val, private) \ - lll_futex_timed_wait (futexp, val, NULL, private) - -#define lll_futex_timed_wait(futexp, val, timeout, private) \ - lll_futex_syscall (4, futexp, \ - __lll_private_flag (FUTEX_WAIT, private), \ - val, timeout) - -/* Verify whether the supplied clockid is supported by - lll_futex_clock_wait_bitset. */ -#define lll_futex_supported_clockid(clockid) \ - ((clockid) == CLOCK_REALTIME || (clockid) == CLOCK_MONOTONIC) - -/* The kernel currently only supports CLOCK_MONOTONIC or - CLOCK_REALTIME timeouts for FUTEX_WAIT_BITSET. We could attempt to - convert others here but currently do not. */ -#define lll_futex_clock_wait_bitset(futexp, val, clockid, timeout, private) \ - ({ \ - long int __ret; \ - if (lll_futex_supported_clockid (clockid)) \ - { \ - const unsigned int clockbit = \ - (clockid == CLOCK_REALTIME) ? FUTEX_CLOCK_REALTIME : 0; \ - const int op = \ - __lll_private_flag (FUTEX_WAIT_BITSET | clockbit, private); \ - \ - __ret = lll_futex_syscall (6, futexp, op, val, \ - timeout, NULL /* Unused. */, \ - FUTEX_BITSET_MATCH_ANY); \ - } \ - else \ - __ret = -EINVAL; \ - __ret; \ - }) - -#define lll_futex_wake(futexp, nr, private) \ - lll_futex_syscall (4, futexp, \ - __lll_private_flag (FUTEX_WAKE, private), nr, 0) - -/* Returns non-zero if error happened, zero if success. */ -#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \ - lll_futex_syscall (6, futexp, \ - __lll_private_flag (FUTEX_CMP_REQUEUE, private), \ - nr_wake, nr_move, mutex, val) - -/* Returns non-zero if error happened, zero if success. */ -#define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \ - lll_futex_syscall (6, futexp, \ - __lll_private_flag (FUTEX_WAKE_OP, private), \ - nr_wake, nr_wake2, futexp2, \ - FUTEX_OP_CLEAR_WAKE_IF_GT_ONE) - -/* Priority Inheritance support. */ -#define lll_futex_wait_requeue_pi(futexp, val, mutex, private) \ - lll_futex_timed_wait_requeue_pi (futexp, val, NULL, 0, mutex, private) - -#define lll_futex_timed_wait_requeue_pi(futexp, val, timeout, clockbit, \ - mutex, private) \ - lll_futex_syscall (5, futexp, \ - __lll_private_flag (FUTEX_WAIT_REQUEUE_PI \ - | (clockbit), private), \ - val, timeout, mutex) - - -#define lll_futex_cmp_requeue_pi(futexp, nr_wake, nr_move, mutex, \ - val, private) \ - lll_futex_syscall (6, futexp, \ - __lll_private_flag (FUTEX_CMP_REQUEUE_PI, \ - private), \ - nr_wake, nr_move, mutex, val) - - -/* Cancellable futex macros. */ -#define lll_futex_wait_cancel(futexp, val, private) \ - ({ \ - int __oldtype = CANCEL_ASYNC (); \ - long int __err = lll_futex_wait (futexp, val, LLL_SHARED); \ - CANCEL_RESET (__oldtype); \ - __err; \ - }) - -#define lll_futex_timed_wait_cancel(futexp, val, timeout, private) \ - ({ \ - int __oldtype = CANCEL_ASYNC (); \ - long int __err = lll_futex_timed_wait (futexp, val, timeout, private); \ - CANCEL_RESET (__oldtype); \ - __err; \ - }) - -#endif /* !__ASSEMBLER__ */ - -#endif /* lowlevellock-futex.h */ |