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a99bfa85d8
2002-07-02 H.J. Lu <hjl@gnu.org> * sysdeps/mips/atomicity.h: Don't include <sgidefs.h>. Always use ll/sc. * sysdeps/unix/sysv/linux/mips/sys/tas.h: Likewise. * sysdeps/unix/sysv/linux/configure.in: Set arch_minimum_kernel to 2.4.0 for mips. TLS fail if USE_TLS is not defined.
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/* Copyright (C) 2000, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _SYS_TAS_H
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#define _SYS_TAS_H 1
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#include <features.h>
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__BEGIN_DECLS
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extern int _test_and_set (int *p, int v) __THROW;
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#ifdef __USE_EXTERN_INLINES
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# ifndef _EXTERN_INLINE
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# define _EXTERN_INLINE extern __inline
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# endif
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_EXTERN_INLINE int
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_test_and_set (int *p, int v) __THROW
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{
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int r, t;
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__asm__ __volatile__
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("/* Inline test and set */\n"
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"1:\n\t"
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".set push\n\t"
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".set mips2\n\t"
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"ll %0,%3\n\t"
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"move %1,%4\n\t"
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"beq %0,%4,2f\n\t"
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"sc %1,%2\n\t"
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".set pop\n\t"
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"beqz %1,1b\n"
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"2:\n\t"
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"/* End test and set */"
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: "=&r" (r), "=&r" (t), "=m" (*p)
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: "m" (*p), "r" (v)
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: "memory");
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return r;
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}
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#endif /* __USE_EXTERN_INLINES */
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__END_DECLS
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#endif /* sys/tas.h */
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