mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-06 05:10:05 +00:00
1dd548500f
2000-06-04 Jakub Jelinek <jakub@redhat.com> * sysdeps/i386/fpu/bits/mathinline.h: Only inline sinh, cosh and tanh if -ffast-math.
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* POSIX spinlock implementation. SPARC64 version.
|
|
Copyright (C) 2000 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <errno.h>
|
|
#include <pthread.h>
|
|
|
|
|
|
/* This implementation is similar to the one used in the Linux kernel. */
|
|
int
|
|
__pthread_spin_lock (pthread_spinlock_t *lock)
|
|
{
|
|
asm volatile
|
|
("1: ldstub [%0], %%g5\n"
|
|
" brnz,pn %%g5, 2f\n"
|
|
" membar #StoreLoad | #StoreStore\n"
|
|
".subsection 2\n"
|
|
"2: ldub [%0], %%g5\n"
|
|
" brnz,pt %%g5, 2b\n"
|
|
" membar #LoadLoad\n"
|
|
" b,a,pt %%xcc, 1b\n"
|
|
".previous"
|
|
: /* no outputs */
|
|
: "r" (lock)
|
|
: "g5", "memory");
|
|
return 0;
|
|
}
|
|
weak_alias (__pthread_spin_lock, pthread_spin_lock)
|
|
|
|
|
|
int
|
|
__pthread_spin_trylock (pthread_spinlock_t *lock)
|
|
{
|
|
int result;
|
|
asm volatile
|
|
("ldstub [%1], %0\n"
|
|
"membar #StoreLoad | #StoreStore"
|
|
: "=r" (result)
|
|
: "r" (lock)
|
|
: "memory");
|
|
return result == 0 ? 0 : EBUSY;
|
|
}
|
|
weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
|
|
|
|
|
|
int
|
|
__pthread_spin_unlock (pthread_spinlock_t *lock)
|
|
{
|
|
asm volatile
|
|
("membar #StoreStore | #LoadStore\n"
|
|
"stb %%g0, [%0]"
|
|
:
|
|
: "r" (lock)
|
|
: "memory");
|
|
return 0;
|
|
}
|
|
weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
|
|
|
|
|
|
int
|
|
__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
|
|
{
|
|
/* We can ignore the `pshared' parameter. Since we are busy-waiting
|
|
all processes which can access the memory location `lock' points
|
|
to can use the spinlock. */
|
|
*lock = 0;
|
|
return 0;
|
|
}
|
|
weak_alias (__pthread_spin_init, pthread_spin_init)
|
|
|
|
|
|
int
|
|
__pthread_spin_destroy (pthread_spinlock_t *lock)
|
|
{
|
|
/* Nothing to do. */
|
|
return 0;
|
|
}
|
|
weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
|