1 /* POSIX spinlock implementation. AM33 version.
2 Copyright 2001 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
21 #include "internals.h"
24 __pthread_spin_lock (pthread_spinlock_t
*lock
)
26 __asm__
__volatile__("1: bset %1, (%0); beq 1b"
27 : : "a" (lock
), "d" (1) : "memory");
30 weak_alias (__pthread_spin_lock
, pthread_spin_lock
)
34 __pthread_spin_trylock (pthread_spinlock_t
*lock
)
38 __asm__
__volatile__ ("bset %0, (%1); beq 1f; clr %0; 1:" :
39 "+d" (oldval
) : "a" (lock
) : "memory");
41 return oldval
? EBUSY
: 0;
43 weak_alias (__pthread_spin_trylock
, pthread_spin_trylock
)
47 __pthread_spin_unlock (pthread_spinlock_t
*lock
)
52 weak_alias (__pthread_spin_unlock
, pthread_spin_unlock
)
56 __pthread_spin_init (pthread_spinlock_t
*lock
, int pshared
)
58 /* We can ignore the `pshared' parameter. Since we are busy-waiting
59 all processes which can access the memory location `lock' points
60 to can use the spinlock. */
64 weak_alias (__pthread_spin_init
, pthread_spin_init
)
68 __pthread_spin_destroy (pthread_spinlock_t
*lock
)
73 weak_alias (__pthread_spin_destroy
, pthread_spin_destroy
)