diff options
author | Ulrich Drepper <drepper@redhat.com> | 1999-01-29 16:58:13 +0000 |
---|---|---|
committer | Ulrich Drepper <drepper@redhat.com> | 1999-01-29 16:58:13 +0000 |
commit | 6eaccb759aff7e3fdd679d39aabaf773b18dfbd1 (patch) | |
tree | ba33932b592d55490b64f2c76ad367e0530ad170 /sysdeps/alpha/atomicity.h | |
parent | 21ab6fb6bc4c2eb2b3a9b533d11942b45865aca5 (diff) | |
download | glibc-6eaccb759aff7e3fdd679d39aabaf773b18dfbd1.tar.gz glibc-6eaccb759aff7e3fdd679d39aabaf773b18dfbd1.tar.xz glibc-6eaccb759aff7e3fdd679d39aabaf773b18dfbd1.zip |
Update. glibc-2.0.112 cvs/glibc-2_0_112
1999-01-29 Richard Henderson <rth@twiddle.net> * scripts/config.sub: Recognize alpha{pca5[67],ev[67]}. * sysdeps/generic/elf/backtracesyms.c (__backtrace_symbols): Format pointer differences as longs. * sysdeps/alpha/fpu/s_floor.c, sysdeps/alpha/fpu/s_floorf.c: Copy commentary from bits/mathinclude.h. Kill unused defines. * sysdeps/alpha/atomicity.h: New file.
Diffstat (limited to 'sysdeps/alpha/atomicity.h')
-rw-r--r-- | sysdeps/alpha/atomicity.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/sysdeps/alpha/atomicity.h b/sysdeps/alpha/atomicity.h new file mode 100644 index 0000000000..34a538f4c0 --- /dev/null +++ b/sysdeps/alpha/atomicity.h @@ -0,0 +1,102 @@ +/* Low-level functions for atomic operations. Alpha version. + Copyright (C) 1999 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 _ATOMICITY_H +#define _ATOMICITY_H 1 + +#include <inttypes.h> + + +static inline int +__attribute__ ((unused)) +exchange_and_add (volatile uint32_t *mem, int val) +{ + register int result, tmp; + + __asm__ __volatile__ ( + "/* Inline exchange & add */\n" + "1:\t" + "ldl_l %0,%3\n\t" + "addl %0,%4,%1\n\t" + "stl_c %1,%2\n\t" + "beq %1,2f\n" + ".subsection 2\n" + "2:\t" + "br 1b\n" + ".subsection 1\n\t" + "mb\n\t" + "/* End exchange & add */" + : "=&r"(result), "=&r"(tmp), "=m"(*mem) + : "m" (*mem), "r"(val)); + + return result; +} + +static inline void +__attribute__ ((unused)) +atomic_add (volatile uint32_t *mem, int val) +{ + register int result; + + __asm__ __volatile__ ( + "/* Inline exchange & add */\n" + "1:\t" + "ldl_l %0,%2\n\t" + "addl %0,%3,%0\n\t" + "stl_c %0,%1\n\t" + "beq %0,2f\n\t" + ".subsection 2\n" + "2:\t" + "br 1b\n" + ".subsection 1\n\t" + "mb\n\t" + "/* End exchange & add */" + : "=&r"(result), "=m"(*mem) + : "m" (*mem), "r"(val)); +} + +static inline long +__attribute__ ((unused)) +compare_and_swap (volatile long int *p, long int oldval, long int newval) +{ + long int ret; + + __asm__ __volatile__ ( + "/* Inline compare & swap */\n" + "1:\t" + "ldq_l %0,%4\n\t" + "cmpeq %0,%2,%0\n\t" + "beq %0,3f\n\t" + "mov %3,%0\n\t" + "stq_c %0,%1\n\t" + "beq %0,2f\n\t" + ".subsection 2\n" + "2:\t" + "br 1b\n" + ".subsection 1\n\t" + "3:\t" + "mb\n\t" + "/* End compare & swap */" + : "=&r"(ret), "=m"(*p) + : "r"(oldval), "r"(newval), "m"(*p)); + + return ret; +} + +#endif /* atomicity.h */ |