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* sysdeps/x86_64/bits/select.h: New file.
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Ulrich Drepper
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Dec 29, 2008
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/* Copyright (C) 1997, 1998, 1999, 2001, 2008 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 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. */ | ||
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#ifndef _SYS_SELECT_H | ||
# error "Never use <bits/select.h> directly; include <sys/select.h> instead." | ||
#endif | ||
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#if defined __GNUC__ && __GNUC__ >= 2 | ||
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# if __WORDSIZE == 64 | ||
# define __FD_ZERO_STOS "stosq" | ||
# else | ||
# define __FD_ZERO_STOS "stosl" | ||
# endif | ||
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# define __FD_ZERO(fdsp) \ | ||
do { \ | ||
int __d0, __d1; \ | ||
__asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS \ | ||
: "=c" (__d0), "=D" (__d1) \ | ||
: "a" (0), "0" (sizeof (fd_set) \ | ||
/ sizeof (__fd_mask)), \ | ||
"1" (&__FDS_BITS (fdsp)[0]) \ | ||
: "memory"); \ | ||
} while (0) | ||
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# define __FD_SET(fd, fdsp) \ | ||
__asm__ __volatile__ ("btsl %1,%0" \ | ||
: "=m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \ | ||
: "r" (((int) (fd)) % __NFDBITS) \ | ||
: "cc","memory") | ||
# define __FD_CLR(fd, fdsp) \ | ||
__asm__ __volatile__ ("btrl %1,%0" \ | ||
: "=m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \ | ||
: "r" (((int) (fd)) % __NFDBITS) \ | ||
: "cc","memory") | ||
# define __FD_ISSET(fd, fdsp) \ | ||
(__extension__ \ | ||
({register char __result; \ | ||
__asm__ __volatile__ ("btl %1,%2 ; setcb %b0" \ | ||
: "=q" (__result) \ | ||
: "r" (((int) (fd)) % __NFDBITS), \ | ||
"m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \ | ||
: "cc"); \ | ||
__result; })) | ||
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#else /* ! GNU CC */ | ||
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/* We don't use `memset' because this would require a prototype and | ||
the array isn't too big. */ | ||
# define __FD_ZERO(set) \ | ||
do { \ | ||
unsigned int __i; \ | ||
fd_set *__arr = (set); \ | ||
for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \ | ||
__FDS_BITS (__arr)[__i] = 0; \ | ||
} while (0) | ||
# define __FD_SET(d, set) (__FDS_BITS (set)[__FDELT (d)] |= __FDMASK (d)) | ||
# define __FD_CLR(d, set) (__FDS_BITS (set)[__FDELT (d)] &= ~__FDMASK (d)) | ||
# define __FD_ISSET(d, set) (__FDS_BITS (set)[__FDELT (d)] & __FDMASK (d)) | ||
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#endif /* GNU CC */ |