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-rw-r--r--libc/sysdeps/linux/mips/sys/tas.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/mips/sys/tas.h b/libc/sysdeps/linux/mips/sys/tas.h
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index 000000000..0c81dc2de
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+++ b/libc/sysdeps/linux/mips/sys/tas.h
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+/* Copyright (C) 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000.
+
+ 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; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _SYS_TAS_H
+#define _SYS_TAS_H 1
+
+#include <features.h>
+#include <sgidefs.h>
+#include <sys/sysmips.h>
+
+__BEGIN_DECLS
+
+extern int _test_and_set (int *p, int v) __THROW;
+
+#ifdef __USE_EXTERN_INLINES
+
+# ifndef _EXTERN_INLINE
+# define _EXTERN_INLINE extern __inline
+# endif
+
+# if (_MIPS_ISA >= _MIPS_ISA_MIPS2)
+
+_EXTERN_INLINE int
+_test_and_set (int *p, int v) __THROW
+{
+ int r, t;
+
+ __asm__ __volatile__
+ ("1:\n\t"
+ "ll %0,%3\n\t"
+ ".set push\n\t"
+ ".set noreorder\n\t"
+ "beq %0,%4,2f\n\t"
+ " move %1,%4\n\t"
+ ".set pop\n\t"
+ "sc %1,%2\n\t"
+ "beqz %1,1b\n"
+ "2:\n"
+ : "=&r" (r), "=&r" (t), "=m" (*p)
+ : "m" (*p), "r" (v)
+ : "memory");
+
+ return r;
+}
+
+# else /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
+
+_EXTERN_INLINE int
+_test_and_set (int *p, int v) __THROW
+{
+ return sysmips (MIPS_ATOMIC_SET, (int) p, v, 0);
+}
+
+# endif /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
+
+#endif /* __USE_EXTERN_INLINES */
+
+__END_DECLS
+
+#endif /* sys/tas.h */