mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/* Low-level lock implementation. Mach gsync-based version.
|
|
Copyright (C) 1994-2022 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 _MACH_LOWLEVELLOCK_H
|
|
#define _MACH_LOWLEVELLOCK_H 1
|
|
|
|
#include <mach/gnumach.h>
|
|
#include <atomic.h>
|
|
|
|
/* Gsync flags. */
|
|
#ifndef GSYNC_SHARED
|
|
# define GSYNC_SHARED 0x01
|
|
# define GSYNC_QUAD 0x02
|
|
# define GSYNC_TIMED 0x04
|
|
# define GSYNC_BROADCAST 0x08
|
|
# define GSYNC_MUTATE 0x10
|
|
#endif
|
|
|
|
/* Static initializer for low-level locks. */
|
|
#define LLL_LOCK_INITIALIZER 0
|
|
|
|
#define LLL_PRIVATE 0
|
|
#define LLL_SHARED SYNC_SHARED
|
|
|
|
/* Interruptible version of __gsync_wait. */
|
|
extern kern_return_t __gsync_wait_intr
|
|
(
|
|
mach_port_t task,
|
|
vm_offset_t addr,
|
|
unsigned val1,
|
|
unsigned val2,
|
|
natural_t msec,
|
|
int flags
|
|
);
|
|
|
|
/* Wait on address PTR, without blocking if its contents
|
|
* are different from VAL. */
|
|
#define __lll_wait(ptr, val, flags) \
|
|
__gsync_wait (__mach_task_self (), \
|
|
(vm_offset_t)(ptr), (val), 0, 0, (flags))
|
|
#define lll_wait(var, val, flags) \
|
|
__lll_wait (&(var), val, flags)
|
|
|
|
/* Interruptible version. */
|
|
#define __lll_wait_intr(ptr, val, flags) \
|
|
__gsync_wait_intr (__mach_task_self (), \
|
|
(vm_offset_t)(ptr), (val), 0, 0, (flags))
|
|
#define lll_wait_intr(var, val, flags) \
|
|
__lll_wait_intr ((&var), val, flags)
|
|
|
|
/* Wake one or more threads waiting on address PTR. */
|
|
#define __lll_wake(ptr, flags) \
|
|
__gsync_wake (__mach_task_self (), (vm_offset_t)(ptr), 0, (flags))
|
|
#define lll_wake(var, flags) \
|
|
__lll_wake (&(var), flags)
|
|
|
|
/* Acquire the lock at PTR. */
|
|
#define __lll_lock(ptr, flags) \
|
|
({ \
|
|
int *__iptr = (int *)(ptr); \
|
|
int __flags = (flags); \
|
|
if (*__iptr != 0 \
|
|
|| atomic_compare_and_exchange_bool_acq (__iptr, 1, 0) != 0) \
|
|
while (1) \
|
|
{ \
|
|
if (atomic_exchange_acq (__iptr, 2) == 0) \
|
|
break; \
|
|
__lll_wait (__iptr, 2, __flags); \
|
|
} \
|
|
(void)0; \
|
|
})
|
|
#define lll_lock(var, flags) \
|
|
__lll_lock (&(var), flags)
|
|
|
|
/* Try to acquire the lock at PTR, without blocking.
|
|
Evaluates to zero on success. */
|
|
#define __lll_trylock(ptr) \
|
|
({ \
|
|
int *__iptr = (int *)(ptr); \
|
|
*__iptr == 0 \
|
|
&& atomic_compare_and_exchange_bool_acq (__iptr, 1, 0) == 0 ? 0 : -1; \
|
|
})
|
|
#define lll_trylock(var) \
|
|
__lll_trylock (&(var))
|
|
|
|
/* Release the lock at PTR. */
|
|
#define __lll_unlock(ptr, flags) \
|
|
({ \
|
|
int *__iptr = (int *)(ptr); \
|
|
if (atomic_exchange_rel (__iptr, 0) == 2) \
|
|
__lll_wake (__iptr, (flags)); \
|
|
(void)0; \
|
|
})
|
|
#define lll_unlock(var, flags) \
|
|
__lll_unlock (&(var), flags)
|
|
|
|
#endif
|