Xpoll.rar

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  • 2015-09-07 10:15
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we have to pay the price of having an array here, unlike with bitmasks calling twice FD_SET with the same fd is not transparent, so be careful.
Xpoll.rar
  • Xpoll.c
    6.9KB
内容介绍
/* Copyright 1994, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. */ /* * Copyright © 2005 Daniel Stone * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that * copyright notice and this permission notice appear in supporting * documentation, and that the name of Daniel Stone not be used in advertising * or publicity pertaining to distribution of the software without specific, * written prior permission. Daniel Stone makes no representations about the * suitability of this software for any purpose. It is provided "as is" * without express or implied warranty. * * DANIEL STONE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL * DANIEL STONE BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef _XPOLL_H_ #define _XPOLL_H_ #ifndef WIN32 #ifndef USE_POLL #include <X11/Xos.h> #include <sys/select.h> /* Get the FD_* macros. */ #include <X11/Xmd.h> #ifdef CSRG_BASED #include <sys/param.h> # if BSD < 199103 typedef long fd_mask; # endif #endif #define XFD_SETSIZE 256 #ifndef FD_SETSIZE #define FD_SETSIZE XFD_SETSIZE #endif #ifndef NBBY #define NBBY 8 /* number of bits in a byte */ #endif #ifndef NFDBITS #define NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */ #endif #ifndef howmany #define howmany(x,y) (((x)+((y)-1))/(y)) #endif #if defined(BSD) && BSD < 198911 typedef struct fd_set { fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)]; } fd_set; #endif # define Select(n,r,w,e,t) select(n,(fd_set*)r,(fd_set*)w,(fd_set*)e,(struct timeval*)t) #define __X_FDS_BITS __fds_bits #ifndef __FDS_BITS # define __FDS_BITS(p) ((p)->__X_FDS_BITS) #endif #define __XFDS_BITS(p, n) (__FDS_BITS(p))[n] #ifndef FD_SET #define FD_SET(n, p) (__XFDS_BITS(p, ((n)/NFDBITS)) |= ((fd_mask)1 << ((n) % NFDBITS))) #endif #ifndef FD_CLR #define FD_CLR(n, p) (__XFDS_BITS((p), ((n)/NFDBITS)) &= ~((fd_mask)1 << ((n) % NFDBITS))) #endif #ifndef FD_ISSET #define FD_ISSET(n, p) ((__XFDS_BITS((p), ((n)/NFDBITS))) & ((fd_mask)1 << ((n) % NFDBITS))) #endif #ifndef FD_ZERO #define FD_ZERO(p) bzero((char *)(p), sizeof(*(p))) #endif /* * The howmany(FD_SETSIZE, NFDBITS) computes the number of elements in the * array. before accessing an element in the array we check it exists. * If it does not exist then the compiler discards the code to access it. */ #define XFD_ANYSET(p) \ ((howmany(FD_SETSIZE, NFDBITS) > 0 && (__XFDS_BITS(p, 0))) || \ (howmany(FD_SETSIZE, NFDBITS) > 1 && (__XFDS_BITS(p, 1))) || \ (howmany(FD_SETSIZE, NFDBITS) > 2 && (__XFDS_BITS(p, 2))) || \ (howmany(FD_SETSIZE, NFDBITS) > 3 && (__XFDS_BITS(p, 3))) || \ (howmany(FD_SETSIZE, NFDBITS) > 4 && (__XFDS_BITS(p, 4))) || \ (howmany(FD_SETSIZE, NFDBITS) > 5 && (__XFDS_BITS(p, 5))) || \ (howmany(FD_SETSIZE, NFDBITS) > 6 && (__XFDS_BITS(p, 6))) || \ (howmany(FD_SETSIZE, NFDBITS) > 7 && (__XFDS_BITS(p, 7)))) #define XFD_COPYSET(src,dst) { \ int __i__; \ for (__i__ = 0; __i__ < howmany(FD_SETSIZE, NFDBITS); __i__++) \ __XFDS_BITS((dst), __i__) = __XFDS_BITS((src), __i__); \ } #define XFD_ANDSET(dst,b1,b2) { \ int __i__; \ for (__i__ = 0; __i__ < howmany(FD_SETSIZE, NFDBITS); __i__++) \ __XFDS_BITS((dst), __i__) = ((__XFDS_BITS((b1), __i__)) & (__XFDS_BITS((b2), __i__))); \ } #define XFD_ORSET(dst,b1,b2) { \ int __i__; \ for (__i__ = 0; __i__ < howmany(FD_SETSIZE, NFDBITS); __i__++) \ __XFDS_BITS((dst), __i__) = ((__XFDS_BITS((b1), __i__)) | (__XFDS_BITS((b2), __i__))); \ } #define XFD_UNSET(dst,b1) { \ int __i__; \ for (__i__ = 0; __i__ < howmany(FD_SETSIZE, NFDBITS); __i__++) \ __XFDS_BITS((dst), __i__) &= ~(__XFDS_BITS((b1), __i__)); \ } #else /* USE_POLL */ #include <sys/poll.h> #endif /* USE_POLL */ #else /* WIN32 */ #define XFD_SETSIZE 256 #ifndef FD_SETSIZE #define FD_SETSIZE XFD_SETSIZE #endif #include <X11/Xwinsock.h> #define Select(n,r,w,e,t) select(0,(fd_set*)r,(fd_set*)w,(fd_set*)e,(struct timeval*)t) #define XFD_SETCOUNT(p) (((fd_set FAR *)(p))->fd_count) #define XFD_FD(p,i) (((fd_set FAR *)(p))->fd_array[i]) #define XFD_ANYSET(p) XFD_SETCOUNT(p) #define XFD_COPYSET(src,dst) { \ u_int __i; \ FD_ZERO(dst); \ for (__i = 0; __i < XFD_SETCOUNT(src) ; __i++) { \ XFD_FD(dst,__i) = XFD_FD(src,__i); \ } \ XFD_SETCOUNT(dst) = XFD_SETCOUNT(src); \ } #define XFD_ANDSET(dst,b1,b2) { \ u_int __i; \ FD_ZERO(dst); \ for (__i = 0; __i < XFD_SETCOUNT(b1) ; __i++) { \ if (FD_ISSET(XFD_FD(b1,__i), b2)) \ FD_SET(XFD_FD(b1,__i), dst); \ } \ } #define XFD_ORSET(dst,b1,b2) { \ u_int __i; \ if (dst != b1) XFD_COPYSET(b1,dst); \ for (__i = 0; __i < XFD_SETCOUNT(b2) ; __i++) { \ if (!FD_ISSET(XFD_FD(b2,__i), dst)) \ FD_SET(XFD_FD(b2,__i), dst); \ } \ } /* this one is really sub-optimal */ #define XFD_UNSET(dst,b1) { \ u_int __i; \ for (__i = 0; __i < XFD_SETCOUNT(b1) ; __i++) { \ FD_CLR(XFD_FD(b1,__i), dst); \ } \ } /* we have to pay the price of having an array here, unlike with bitmasks calling twice FD_SET with the same fd is not transparent, so be careful */ #undef FD_SET #define FD_SET(fd,set) do { \ if (XFD_SETCOUNT(set) < FD_SETSIZE && !FD_ISSET(fd,set)) \ XFD_FD(set,XFD_SETCOUNT(set)++)=(fd); \ } while(0) #define getdtablesize() FD_SETSIZE #endif /* WIN32 */ #endif /* _XPOLL_H_ */
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