diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | manual/stdio.texi | 2 | ||||
| -rw-r--r-- | sysdeps/mips/atomicity.h | 128 |
3 files changed, 134 insertions, 1 deletions
@@ -1,3 +1,8 @@ +2001-05-27 Andreas Jaeger <aj@suse.de> + + * manual/stdio.texi (String Streams): Fix fmemopen description. + Reported by Michal Kochanowicz <michal@michal.waw.pl>. + 2001-05-26 H.J. Lu <hjl@gnu.org> * sysdeps/unix/sysv/linux/mips/syscalls.list: Change sigsuspend diff --git a/manual/stdio.texi b/manual/stdio.texi index 8b1f407..758a5d1 100644 --- a/manual/stdio.texi +++ b/manual/stdio.texi @@ -4798,7 +4798,7 @@ dynamically allocates an array @var{size} bytes long (as with @code{malloc}; if you are going to write things to the buffer and then read them back in again, because you have no way of actually getting a pointer to the buffer (for this, try @code{open_memstream}, below). The buffer is -freed when the stream is open. +freed when the stream is closed. The argument @var{opentype} is the same as in @code{fopen} (@pxref{Opening Streams}). If the @var{opentype} specifies diff --git a/sysdeps/mips/atomicity.h b/sysdeps/mips/atomicity.h new file mode 100644 index 0000000..d6e1767 --- /dev/null +++ b/sysdeps/mips/atomicity.h @@ -0,0 +1,128 @@ +/* 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 */ |