mirror of
git://sourceware.org/git/glibc.git
synced 2025-01-12 12:07:12 +08:00
5d3b4a7723
* sysdeps/hppa/linuxthreads/pspinlock.c: New file. * sysdeps/hppa/linuxthreads/pt-machine.h: Likewise. * sysdeps/hppa/linuxthreads/tls.h: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/aio_cancel.c: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/malloc-machine.h: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/pt-initfini.c: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/sysdep-cancel.h: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/bits/initspin.h: Likewise. * sysdeps/unix/sysv/linux/hppa/linuxthreads/bits/pthreadtypes.h: Likewise.
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* POSIX spinlock implementation. hppa 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 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; 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>
|
|
#include "internals.h"
|
|
|
|
int
|
|
__pthread_spin_lock (pthread_spinlock_t *lock)
|
|
{
|
|
volatile unsigned int *addr = __ldcw_align (lock);
|
|
|
|
while (__ldcw (addr) == 0)
|
|
while (*addr == 0) ;
|
|
|
|
return 0;
|
|
}
|
|
weak_alias (__pthread_spin_lock, pthread_spin_lock)
|
|
|
|
|
|
int
|
|
__pthread_spin_trylock (pthread_spinlock_t *lock)
|
|
{
|
|
volatile unsigned int *a = __ldcw_align (lock);
|
|
|
|
return __ldcw (a) ? 0 : EBUSY;
|
|
}
|
|
weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
|
|
|
|
|
|
int
|
|
__pthread_spin_unlock (pthread_spinlock_t *lock)
|
|
{
|
|
volatile unsigned int *a = __ldcw_align (lock);
|
|
int tmp = 1;
|
|
/* This should be a memory barrier to newer compilers */
|
|
__asm__ __volatile__ ("stw,ma %1,0(%0)"
|
|
: : "r" (a), "r" (tmp) : "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. */
|
|
volatile unsigned int *a = __ldcw_align (lock);
|
|
int tmp = 1;
|
|
/* This should be a memory barrier to newer compilers */
|
|
__asm__ __volatile__ ("stw,ma %1,0(%0)"
|
|
: : "r" (a), "r" (tmp) : "memory");
|
|
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)
|