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authorAndreas Jaeger <aj@suse.de>2001-05-27 17:16:16 +0000
committerAndreas Jaeger <aj@suse.de>2001-05-27 17:16:16 +0000
commit417d6b34b405dd56eab12fab6803216d60e572f0 (patch)
tree7dfff7cb9c0195cf689cde908fdf4960c6437854 /sysdeps/mips/atomicity.h
parentdbbf07d057cc57daec7067b43fc3802fb2a1c342 (diff)
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Update.
2001-05-27 Andreas Jaeger <aj@suse.de> * manual/stdio.texi (String Streams): Fix fmemopen description. Reported by Michal Kochanowicz <michal@michal.waw.pl>.
Diffstat (limited to 'sysdeps/mips/atomicity.h')
-rw-r--r--sysdeps/mips/atomicity.h128
1 files changed, 128 insertions, 0 deletions
diff --git a/sysdeps/mips/atomicity.h b/sysdeps/mips/atomicity.h
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+++ b/sysdeps/mips/atomicity.h
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+/* Low-level functions for atomic operations. Mips version.
+
+ Copyright (C) 2001 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 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.,
+ 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#ifndef _MIPS_ATOMICITY_H
+#define _MIPS_ATOMICITY_H 1
+
+#include <sgidefs.h>
+#include <inttypes.h>
+
+#if (_MIPS_ISA >= _MIPS_ISA_MIPS2)
+
+static inline int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+ int result, tmp;
+
+ __asm__ __volatile__
+ ("/* Inline exchange & add */\n\t"
+ "1:\n\t"
+ "ll %0,%3\n\t"
+ "addu %1,%4,%0\n\t"
+ "sc %1,%2\n\t"
+ "beqz %1,1b\n\t"
+ "/* End exchange & add */"
+ : "=&r"(result), "=&r"(tmp), "=m"(*mem)
+ : "m" (*mem), "r"(val)
+ : "memory");
+
+ return result;
+}
+
+static inline void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+ int result;
+
+ __asm__ __volatile__
+ ("/* Inline atomic add */\n\t"
+ "1:\n\t"
+ "ll %0,%2\n\t"
+ "addu %0,%3,%0\n\t"
+ "sc %0,%1\n\t"
+ "beqz %0,1b\n\t"
+ "/* End atomic add */"
+ : "=&r"(result), "=m"(*mem)
+ : "m" (*mem), "r"(val)
+ : "memory");
+}
+
+static inline int
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+ long int ret;
+
+ __asm__ __volatile__
+ ("/* Inline compare & swap */\n\t"
+ "1:\n\t"
+ "ll %0,%4\n\t"
+ ".set push\n"
+ ".set noreorder\n\t"
+ "bne %0,%2,2f\n\t"
+ "move %0,%3\n\t"
+ ".set pop\n\t"
+ "sc %0,%1\n\t"
+ "beqz %0,1b\n"
+ "2:\n\t"
+ "/* End compare & swap */"
+ : "=&r" (ret), "=m" (*p)
+ : "r" (oldval), "r" (newval), "m" (*p)
+ : "memory");
+
+ return ret;
+}
+
+#else /* (_MIPS_ISA >= _MIPS_ISA_MIPS2) */
+
+#warning MIPS I atomicity functions are not atomic
+
+static inline int
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, int val)
+{
+ int result = *mem;
+ *mem += val;
+ return result;
+}
+
+static inline void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+ *mem += val;
+}
+
+static inline int
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+ if (*p != oldval)
+ return 0;
+
+ *p = newval;
+ return 1;
+}
+
+#endif /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
+
+#endif /* atomicity.h */