mirror of
https://github.com/ziglang/zig.git
synced 2025-12-06 14:23:09 +00:00
553cb3ed46
sys/param.h was manually adjusted to not define __NetBSD_Version__ since it will be defined by the compiler.
184 lines
6.8 KiB
C
Vendored
184 lines
6.8 KiB
C
Vendored
/* $NetBSD: futex.h,v 1.5 2021/09/28 15:05:42 thorpej Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2018, 2019 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Taylor R. Campbell and Jason R. Thorpe.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 2005 Emmanuel Dreyfus, all rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Emmanuel Dreyfus
|
|
* 4. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS''
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
|
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _SYS_FUTEX_H_
|
|
#define _SYS_FUTEX_H_
|
|
|
|
/*
|
|
* Definitions for the __futex(2) synchronization primitive.
|
|
*
|
|
* These definitions are intended to be ABI-compatible with the
|
|
* Linux futex(2) system call.
|
|
*/
|
|
|
|
#include <sys/timespec.h>
|
|
|
|
#define FUTEX_WAIT 0
|
|
#define FUTEX_WAKE 1
|
|
#define FUTEX_FD 2
|
|
#define FUTEX_REQUEUE 3
|
|
#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 __BIT(7)
|
|
#define FUTEX_CLOCK_REALTIME __BIT(8)
|
|
|
|
#define FUTEX_CMD_MASK \
|
|
(~(FUTEX_PRIVATE_FLAG|FUTEX_CLOCK_REALTIME))
|
|
|
|
#define FUTEX_OP_OP_MASK __BITS(28,31)
|
|
#define FUTEX_OP_CMP_MASK __BITS(24,27)
|
|
#define FUTEX_OP_OPARG_MASK __BITS(12,23)
|
|
#define FUTEX_OP_CMPARG_MASK __BITS(0,11)
|
|
|
|
#define FUTEX_OP(op, oparg, cmp, cmparg) \
|
|
(__SHIFTIN(op, FUTEX_OP_OP_MASK) |\
|
|
__SHIFTIN(oparg, FUTEX_OP_OPARG_MASK) |\
|
|
__SHIFTIN(cmp, FUTEX_OP_CMP_MASK) |\
|
|
__SHIFTIN(cmparg, FUTEX_OP_CMPARG_MASK))
|
|
|
|
#define FUTEX_OP_SET 0
|
|
#define FUTEX_OP_ADD 1
|
|
#define FUTEX_OP_OR 2
|
|
#define FUTEX_OP_ANDN 3
|
|
#define FUTEX_OP_XOR 4
|
|
#define FUTEX_OP_OPARG_SHIFT 8
|
|
|
|
#define FUTEX_OP_CMP_EQ 0
|
|
#define FUTEX_OP_CMP_NE 1
|
|
#define FUTEX_OP_CMP_LT 2
|
|
#define FUTEX_OP_CMP_LE 3
|
|
#define FUTEX_OP_CMP_GT 4
|
|
#define FUTEX_OP_CMP_GE 5
|
|
|
|
/*
|
|
* FUTEX_SYNCOBJ_0 and FUTEX_SYNCOBJ_1 are extensions to the Linux
|
|
* futex API that are reserved for individual consumers of futexes
|
|
* to define information specific to that synchronzation object.
|
|
* Note that as a result there is a system-wide upper limit of
|
|
* 268,435,455 threads (as opposed to 1,073,741,823).
|
|
*/
|
|
#define FUTEX_WAITERS ((int)__BIT(31))
|
|
#define FUTEX_OWNER_DIED ((int)__BIT(30))
|
|
#define FUTEX_SYNCOBJ_1 ((int)__BIT(29))
|
|
#define FUTEX_SYNCOBJ_0 ((int)__BIT(28))
|
|
#define FUTEX_TID_MASK ((int)__BITS(0,27))
|
|
|
|
#define FUTEX_BITSET_MATCH_ANY ((int)__BITS(0,31))
|
|
|
|
/*
|
|
* The robust futex ABI consists of an array of 3 longwords, the address
|
|
* of which is registered with the kernel on a per-thread basis:
|
|
*
|
|
* 0: A pointer to a singly-linked list of "lock entries". If the
|
|
* list is empty, this points back to the list itself.
|
|
*
|
|
* 1: An offset from address of the "lock entry" to the 32-bit futex
|
|
* word associated with that lock entry (may be negative).
|
|
*
|
|
* 2: A "pending" pointer, for locks that are in the process of being
|
|
* acquired or released.
|
|
*
|
|
* PI futexes are handled slightly differently. User-space indicates
|
|
* an entry is for a PI futex by setting the last-significant bit.
|
|
*/
|
|
#define _FUTEX_ROBUST_HEAD_LIST 0
|
|
#define _FUTEX_ROBUST_HEAD_OFFSET 1
|
|
#define _FUTEX_ROBUST_HEAD_PENDING 2
|
|
#define _FUTEX_ROBUST_HEAD_NWORDS 3
|
|
#define _FUTEX_ROBUST_HEAD_SIZE (_FUTEX_ROBUST_HEAD_NWORDS * \
|
|
sizeof(u_long))
|
|
#define _FUTEX_ROBUST_HEAD_SIZE32 (_FUTEX_ROBUST_HEAD_NWORDS * \
|
|
sizeof(uint32_t))
|
|
#define _FUTEX_ROBUST_ENTRY_PI __BIT(0)
|
|
|
|
#ifdef __LIBC_FUTEX_PRIVATE
|
|
struct futex_robust_list {
|
|
struct futex_robust_list *next;
|
|
};
|
|
|
|
struct futex_robust_list_head {
|
|
struct futex_robust_list list;
|
|
long futex_offset;
|
|
struct futex_robust_list *pending_list;
|
|
};
|
|
#endif /* __LIBC_FUTEX_PRIVATE */
|
|
|
|
#ifdef _KERNEL
|
|
struct lwp;
|
|
|
|
int futex_robust_head_lookup(struct lwp *, lwpid_t, void **);
|
|
void futex_release_all_lwp(struct lwp *);
|
|
int do_futex(int *, int, int, const struct timespec *, int *, int,
|
|
int, register_t *);
|
|
void futex_sys_init(void);
|
|
void futex_sys_fini(void);
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* ! _SYS_FUTEX_H_ */ |