pt-machine.h

linux 下的线程库源码

/* Machine-dependent pthreads configuration and inline functions.
   sparc version.
Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson <[e-mail]>.

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., 675 Mass Ave,
Cambridge, MA 02139, USA.  */


/* Spinlock implementation; required.  */
static inline int testandset(int *spinlock)
{
  int ret;

  __asm__ __volatile__("ldstub %1,%0"
	: "=r"(ret), "=m"(*spinlock)
	: "m"(*spinlock));

  return ret;
}


/* Spinlock release; default is just set to zero.  */
#define RELEASE(spinlock) \
  __asm__ __volatile__("stbar; stb %1,%0" : "=m"(*(spinlock)) : "r"(0));


/* Get some notion of the current stack.  Need not be exactly the top
   of the stack, just something somewhere in the current frame.  */
#define CURRENT_STACK_FRAME  stack_pointer
register char * stack_pointer __asm__("%sp");