X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/91c2e643914a5e26e943053c60055bb839204d38..f279f2b7372a6523b4055dea41bc75e0a3d7b253:/ev.c diff --git a/ev.c b/ev.c index 8a92fb0..d024017 100644 --- a/ev.c +++ b/ev.c @@ -4,29 +4,37 @@ * Copyright (c) 2007 Marc Alexander Lehmann * All rights reserved. * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: + * 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. * - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * * 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 COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, 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 OTHERWISE) 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. */ #ifdef __cplusplus @@ -56,6 +64,14 @@ extern "C" { # endif # endif +# ifndef EV_USE_NANOSLEEP +# if HAVE_NANOSLEEP +# define EV_USE_NANOSLEEP 1 +# else +# define EV_USE_NANOSLEEP 0 +# endif +# endif + # ifndef EV_USE_SELECT # if HAVE_SELECT && HAVE_SYS_SELECT_H # define EV_USE_SELECT 1 @@ -148,6 +164,10 @@ extern "C" { # define EV_USE_REALTIME 0 #endif +#ifndef EV_USE_NANOSLEEP +# define EV_USE_NANOSLEEP 0 +#endif + #ifndef EV_USE_SELECT # define EV_USE_SELECT 1 #endif @@ -209,6 +229,12 @@ extern "C" { # define EV_USE_INOTIFY 0 #endif +#if !EV_USE_NANOSLEEP +# ifndef _WIN32 +# include +# endif +#endif + #if EV_USE_INOTIFY # include #endif @@ -264,7 +290,11 @@ typedef ev_watcher *W; typedef ev_watcher_list *WL; typedef ev_watcher_time *WT; -static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */ +#if EV_USE_MONOTONIC +/* sig_atomic_t is used to avoid per-thread variables or locking but still */ +/* giving it a reasonably high chance of working on typical architetcures */ +static sig_atomic_t have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */ +#endif #ifdef _WIN32 # include "ev_win32.c" @@ -410,6 +440,33 @@ ev_now (EV_P) } #endif +void +ev_sleep (ev_tstamp delay) +{ + if (delay > 0.) + { +#if EV_USE_NANOSLEEP + struct timespec ts; + + ts.tv_sec = (time_t)delay; + ts.tv_nsec = (long)((delay - (ev_tstamp)(ts.tv_sec)) * 1e9); + + nanosleep (&ts, 0); +#elif defined(_WIN32) + Sleep (delay * 1e3); +#else + struct timeval tv; + + tv.tv_sec = (time_t)delay; + tv.tv_usec = (long)((delay - (ev_tstamp)(tv.tv_sec)) * 1e6); + + select (0, 0, 0, 0, &tv); +#endif + } +} + +/*****************************************************************************/ + int inline_size array_nextsize (int elem, int cur, int cnt) { @@ -545,7 +602,11 @@ fd_reify (EV_P) if (events) { unsigned long argp; - anfd->handle = _get_osfhandle (fd); + #ifdef EV_FD_TO_WIN32_HANDLE + anfd->handle = EV_FD_TO_WIN32_HANDLE (fd); + #else + anfd->handle = _get_osfhandle (fd); + #endif assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0)); } #endif @@ -927,9 +988,13 @@ ev_recommended_backends (void) unsigned int ev_embeddable_backends (void) { - return EVBACKEND_EPOLL - | EVBACKEND_KQUEUE - | EVBACKEND_PORT; + int flags = EVBACKEND_EPOLL | EVBACKEND_KQUEUE | EVBACKEND_PORT; + + /* epoll embeddability broken on all linux versions up to at least 2.6.23 */ + /* please fix it and tell me how to detect the fix */ + flags &= ~EVBACKEND_EPOLL; + + return flags; } unsigned int @@ -944,6 +1009,18 @@ ev_loop_count (EV_P) return loop_count; } +void +ev_set_io_collect_interval (EV_P_ ev_tstamp interval) +{ + io_blocktime = interval; +} + +void +ev_set_timeout_collect_interval (EV_P_ ev_tstamp interval) +{ + timeout_blocktime = interval; +} + static void noinline loop_init (EV_P_ unsigned int flags) { @@ -962,6 +1039,9 @@ loop_init (EV_P_ unsigned int flags) now_floor = mn_now; rtmn_diff = ev_rt_now - mn_now; + io_blocktime = 0.; + timeout_blocktime = 0.; + /* pid check not overridable via env */ #ifndef _WIN32 if (flags & EVFLAG_FORKCHECK) @@ -1088,6 +1168,7 @@ loop_fork (EV_P) syserr ("(libev) error creating pipe"); siginit (EV_A); + sigcb (EV_A_ &sigev, EV_READ); } postfork = 0; @@ -1119,7 +1200,7 @@ ev_loop_destroy (EV_P) void ev_loop_fork (EV_P) { - postfork = 1; + postfork = 1; // must be in line with ev_default_fork } #endif @@ -1193,7 +1274,7 @@ ev_default_fork (void) #endif if (backend) - postfork = 1; + postfork = 1; // must be in line with ev_loop_fork } /*****************************************************************************/ @@ -1458,39 +1539,50 @@ ev_loop (EV_P_ int flags) /* calculate blocking time */ { - ev_tstamp block; + ev_tstamp waittime = 0.; + ev_tstamp sleeptime = 0.; - if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt)) - block = 0.; /* do not block at all */ - else + if (expect_true (!(flags & EVLOOP_NONBLOCK || idleall || !activecnt))) { /* update time to cancel out callback processing overhead */ time_update (EV_A_ 1e100); - block = MAX_BLOCKTIME; + waittime = MAX_BLOCKTIME; if (timercnt) { ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge; - if (block > to) block = to; + if (waittime > to) waittime = to; } #if EV_PERIODIC_ENABLE if (periodiccnt) { ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge; - if (block > to) block = to; + if (waittime > to) waittime = to; } #endif - if (expect_false (block < 0.)) block = 0.; + if (expect_false (waittime < timeout_blocktime)) + waittime = timeout_blocktime; + + sleeptime = waittime - backend_fudge; + + if (expect_true (sleeptime > io_blocktime)) + sleeptime = io_blocktime; + + if (sleeptime) + { + ev_sleep (sleeptime); + waittime -= sleeptime; + } } ++loop_count; - backend_poll (EV_A_ block); + backend_poll (EV_A_ waittime); /* update ev_rt_now, do magic */ - time_update (EV_A_ block); + time_update (EV_A_ waittime + sleeptime); } /* queue pending timers and reschedule them */ @@ -2195,7 +2287,7 @@ embed_io_cb (EV_P_ ev_io *io, int revents) if (ev_cb (w)) ev_feed_event (EV_A_ (W)w, EV_EMBED); else - ev_embed_sweep (loop, w); + ev_loop (w->other, EVLOOP_NONBLOCK); } static void @@ -2203,8 +2295,24 @@ embed_prepare_cb (EV_P_ ev_prepare *prepare, int revents) { ev_embed *w = (ev_embed *)(((char *)prepare) - offsetof (ev_embed, prepare)); - fd_reify (w->other); + { + struct ev_loop *loop = w->other; + + while (fdchangecnt) + { + fd_reify (EV_A); + ev_loop (EV_A_ EVLOOP_NONBLOCK); + } + } +} + +#if 0 +static void +embed_idle_cb (EV_P_ ev_idle *idle, int revents) +{ + ev_idle_stop (EV_A_ idle); } +#endif void ev_embed_start (EV_P_ ev_embed *w) @@ -2215,7 +2323,7 @@ ev_embed_start (EV_P_ ev_embed *w) { struct ev_loop *loop = w->other; assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ())); - ev_io_init (&w->io, embed_io_cb, backend_fd, EV_WRITE); + ev_io_init (&w->io, embed_io_cb, backend_fd, EV_READ); } ev_set_priority (&w->io, ev_priority (w)); @@ -2225,6 +2333,8 @@ ev_embed_start (EV_P_ ev_embed *w) ev_set_priority (&w->prepare, EV_MINPRI); ev_prepare_start (EV_A_ &w->prepare); + /*ev_idle_init (&w->idle, e,bed_idle_cb);*/ + ev_start (EV_A_ (W)w, 1); }