77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* Machine-dependent pthreads configuration and inline functions.
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S390 version.
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Copyright (C) 1999 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef PT_EI
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# define PT_EI extern inline
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#endif
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/* Spinlock implementation; required. */
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PT_EI int
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testandset (int *spinlock)
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{
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int ret;
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__asm__ __volatile__(
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" lhi 0,1\n"
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" l %0,%1\n"
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"0: cs %0,0,%1\n"
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" jl 0b"
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: "=&d" (ret), "+m" (*spinlock)
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: : "0", "cc");
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return ret;
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}
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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#define CURRENT_STACK_FRAME stack_pointer
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register char * stack_pointer __asm__ ("15");
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/* Compare-and-swap for semaphores. */
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#define HAS_COMPARE_AND_SWAP
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PT_EI int
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__compare_and_swap(long int *p, long int oldval, long int newval)
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{
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int retval;
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__asm__ __volatile__(
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" lr 0,%2\n"
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" cs 0,%3,%1\n"
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" ipm %0\n"
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" srl %0,28\n"
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"0:"
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: "=&d" (retval), "+m" (*p)
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: "d" (oldval) , "d" (newval)
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: "cc", "0");
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return retval == 0;
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}
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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#define CURRENT_STACK_FRAME stack_pointer
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register char * stack_pointer __asm__ ("%r15");
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