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87 lines
3.0 KiB
C
87 lines
3.0 KiB
C
/* Copyright (C) 1997, 1998, 1999, 2001, 2008 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _SYS_SELECT_H
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# error "Never use <bits/select.h> directly; include <sys/select.h> instead."
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#endif
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#include <bits/wordsize.h>
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#if defined __GNUC__ && __GNUC__ >= 2
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# if __WORDSIZE == 64
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# define __FD_ZERO_STOS "stosq"
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# define __FD_SET_BTS "btsq"
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# define __FD_CLR_BTR "btrq"
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# define __FD_ISSET_BT "btq"
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# else
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# define __FD_ZERO_STOS "stosl"
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# define __FD_SET_BTS "btsl"
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# define __FD_CLR_BTR "btrl"
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# define __FD_ISSET_BT "btl"
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# endif
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# define __FD_ZERO(fdsp) \
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do { \
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int __d0, __d1; \
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__asm__ __volatile__ ("cld; rep; " __FD_ZERO_STOS \
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: "=c" (__d0), "=D" (__d1) \
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: "a" (0), "0" (sizeof (fd_set) \
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/ sizeof (__fd_mask)), \
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"1" (&__FDS_BITS (fdsp)[0]) \
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: "memory"); \
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} while (0)
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# define __FD_SET(fd, fdsp) \
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__asm__ __volatile__ (__FD_SET_BTS " %1,%0" \
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: "=m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \
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: "r" (((int) (fd)) % __NFDBITS) \
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: "cc","memory")
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# define __FD_CLR(fd, fdsp) \
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__asm__ __volatile__ (__FD_CLR_BTR " %1,%0" \
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: "=m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \
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: "r" (((int) (fd)) % __NFDBITS) \
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: "cc","memory")
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# define __FD_ISSET(fd, fdsp) \
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(__extension__ \
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({register char __result; \
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__asm__ __volatile__ (__FD_ISSET_BT " %1,%2 ; setcb %b0" \
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: "=q" (__result) \
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: "r" (((int) (fd)) % __NFDBITS), \
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"m" (__FDS_BITS (fdsp)[__FDELT (fd)]) \
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: "cc"); \
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__result; }))
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#else /* ! GNU CC */
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/* We don't use `memset' because this would require a prototype and
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the array isn't too big. */
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# define __FD_ZERO(set) \
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do { \
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unsigned int __i; \
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fd_set *__arr = (set); \
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for (__i = 0; __i < sizeof (fd_set) / sizeof (__fd_mask); ++__i) \
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__FDS_BITS (__arr)[__i] = 0; \
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} while (0)
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# define __FD_SET(d, set) (__FDS_BITS (set)[__FDELT (d)] |= __FDMASK (d))
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# define __FD_CLR(d, set) (__FDS_BITS (set)[__FDELT (d)] &= ~__FDMASK (d))
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# define __FD_ISSET(d, set) (__FDS_BITS (set)[__FDELT (d)] & __FDMASK (d))
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#endif /* GNU CC */
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