X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/efb07571c1a235448b70212dc46467214da4bb92..4f776fde71f96363bbbb7ac6570a0db2f0cfb8ba:/ev_select.c diff --git a/ev_select.c b/ev_select.c index 5ce1db8..b52a88d 100644 --- a/ev_select.c +++ b/ev_select.c @@ -1,90 +1,244 @@ -/* for broken bsd's */ -#include -#include -#include - +/* + * libev select fd activity backend + * + * Copyright (c) 2007 Marc Alexander Lehmann + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modifica- + * tion, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- + * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO + * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- + * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- + * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. + */ + +#ifndef _WIN32 /* for unix systems */ -#include +# include +# include +#endif + +#ifndef EV_SELECT_USE_FD_SET +# ifdef NFDBITS +# define EV_SELECT_USE_FD_SET 0 +# else +# define EV_SELECT_USE_FD_SET 1 +# endif +#endif + +#if EV_SELECT_IS_WINSOCKET +# undef EV_SELECT_USE_FD_SET +# define EV_SELECT_USE_FD_SET 1 +# undef EINTR +# define EINTR WSAEINTR +# undef EBADF +# define EBADF WSAENOTSOCK +# undef ENOMEM +# define ENOMEM (errno + 1) +#endif + +#if !EV_SELECT_USE_FD_SET +# define NFDBYTES (NFDBITS / 8) +#endif #include -#include - -static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo; -static int vec_max; static void -select_modify (int fd, int oev, int nev) +select_modify (EV_P_ int fd, int oev, int nev) { - int offs = fd >> 3; - int mask = 1 << (fd & 7); - - if (vec_max < (fd >> 5) + 1) - { - vec_max = (fd >> 5) + 1; - - vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); - vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ - vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); - vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ - } - - vec_ri [offs] |= mask; - if (!(nev & EV_READ)) - vec_ri [offs] &= ~mask; - - vec_wi [offs] |= mask; - if (!(nev & EV_WRITE)) - vec_wi [offs] &= ~mask; + if (oev == nev) + return; + + { +#if EV_SELECT_USE_FD_SET + + #if EV_SELECT_IS_WINSOCKET + SOCKET handle = anfds [fd].handle; + #else + int handle = fd; + #endif + + if (nev & EV_READ) + FD_SET (handle, (fd_set *)vec_ri); + else + FD_CLR (handle, (fd_set *)vec_ri); + + if (nev & EV_WRITE) + FD_SET (handle, (fd_set *)vec_wi); + else + FD_CLR (handle, (fd_set *)vec_wi); + +#else + + int word = fd / NFDBITS; + int mask = 1UL << (fd % NFDBITS); + + if (expect_false (vec_max < word + 1)) + { + int new_max = word + 1; + + vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); + vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ + vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); + vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ + + for (; vec_max < new_max; ++vec_max) + ((fd_mask *)vec_ri)[vec_max] = + ((fd_mask *)vec_wi)[vec_max] = 0; + } + + ((fd_mask *)vec_ri) [word] |= mask; + if (!(nev & EV_READ)) + ((fd_mask *)vec_ri) [word] &= ~mask; + + ((fd_mask *)vec_wi) [word] |= mask; + if (!(nev & EV_WRITE)) + ((fd_mask *)vec_wi) [word] &= ~mask; +#endif + } } -static void select_poll (ev_tstamp timeout) +static void +select_poll (EV_P_ ev_tstamp timeout) { struct timeval tv; int res; - memcpy (vec_ro, vec_ri, vec_max * 4); - memcpy (vec_wo, vec_wi, vec_max * 4); +#if EV_SELECT_USE_FD_SET + memcpy (vec_ro, vec_ri, sizeof (fd_set)); + memcpy (vec_wo, vec_wi, sizeof (fd_set)); +#else + memcpy (vec_ro, vec_ri, vec_max * NFDBYTES); + memcpy (vec_wo, vec_wi, vec_max * NFDBYTES); +#endif tv.tv_sec = (long)timeout; tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); - res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); + res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); - if (res > 0) + if (expect_false (res < 0)) { - int word, offs; + #if EV_SELECT_IS_WINSOCKET + errno = WSAGetLastError (); + #endif + + if (errno == EBADF) + fd_ebadf (EV_A); + else if (errno == ENOMEM && !syserr_cb) + fd_enomem (EV_A); + else if (errno != EINTR) + syserr ("(libev) select"); + + return; + } + +#if EV_SELECT_USE_FD_SET - for (word = vec_max; word--; ) + { + int fd; + + for (fd = 0; fd < anfdmax; ++fd) + if (anfds [fd].events) { - if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) - for (offs = 4; offs--; ) - { - int idx = word * 4 + offs; - unsigned char byte_r = vec_ro [idx]; - unsigned char byte_w = vec_wo [idx]; - int bit; - - if (byte_r | byte_w) - for (bit = 8; bit--; ) - { - int events = 0; - events |= byte_r & (1 << bit) ? EV_READ : 0; - events |= byte_w & (1 << bit) ? EV_WRITE : 0; - - if (events) - fd_event (idx * 8 + bit, events); - } - } + int events = 0; + #if EV_SELECT_IS_WINSOCKET + SOCKET handle = anfds [fd].handle; + #else + int handle = fd; + #endif + + if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; + if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; + + if (expect_true (events)) + fd_event (EV_A_ fd, events); } - } + } + +#else + + { + int word, bit; + for (word = vec_max; word--; ) + { + fd_mask word_r = ((fd_mask *)vec_ro) [word]; + fd_mask word_w = ((fd_mask *)vec_wo) [word]; + + if (word_r || word_w) + for (bit = NFDBITS; bit--; ) + { + fd_mask mask = 1UL << bit; + int events = 0; + + events |= word_r & mask ? EV_READ : 0; + events |= word_w & mask ? EV_WRITE : 0; + + if (expect_true (events)) + fd_event (EV_A_ word * NFDBITS + bit, events); + } + } + } + +#endif +} + +int inline_size +select_init (EV_P_ int flags) +{ + backend_fudge = 0.; /* posix says this is zero */ + backend_modify = select_modify; + backend_poll = select_poll; + +#if EV_SELECT_USE_FD_SET + vec_max = FD_SETSIZE / 32; + vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); + vec_ro = ev_malloc (sizeof (fd_set)); + vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); + vec_wo = ev_malloc (sizeof (fd_set)); +#else + vec_max = 0; + vec_ri = 0; + vec_ri = 0; + vec_wo = 0; + vec_wo = 0; +#endif + + return EVBACKEND_SELECT; } -void select_init (int flags) +void inline_size +select_destroy (EV_P) { - ev_method = EVMETHOD_SELECT; - method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ - method_modify = select_modify; - method_poll = select_poll; + ev_free (vec_ri); + ev_free (vec_ro); + ev_free (vec_wi); + ev_free (vec_wo); }