X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/487c8aa2bb79f45c17a479dd48d8dc45948d2527..2fde047707205b8d8f1c71482d2df57105217e17:/ev.c diff --git a/ev.c b/ev.c index a038613..8a09326 100644 --- a/ev.c +++ b/ev.c @@ -1,18 +1,48 @@ +/* + * 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: + * + * * 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. + */ + #include #include #include #include #include +#include #include #include #include +#include +#include #include #include -#define HAVE_EPOLL 1 - #ifndef HAVE_MONOTONIC # ifdef CLOCK_MONOTONIC # define HAVE_MONOTONIC 1 @@ -33,6 +63,7 @@ #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ #define MAX_BLOCKTIME 60. +#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */ #include "ev.h" @@ -84,8 +115,13 @@ get_clock (void) #define array_needsize(base,cur,cnt,init) \ if ((cnt) > cur) \ { \ - int newcnt = cur ? cur << 1 : 16; \ - fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ + int newcnt = cur; \ + do \ + { \ + newcnt = (newcnt << 1) | 4 & ~3; \ + } \ + while ((cnt) > newcnt); \ + \ base = realloc (base, sizeof (*base) * (newcnt)); \ init (base + cur, newcnt - cur); \ cur = newcnt; \ @@ -128,10 +164,13 @@ static int pendingmax, pendingcnt; static void event (W w, int events) { - w->pending = ++pendingcnt; - array_needsize (pendings, pendingmax, pendingcnt, ); - pendings [pendingcnt - 1].w = w; - pendings [pendingcnt - 1].events = events; + if (w->active) + { + w->pending = ++pendingcnt; + array_needsize (pendings, pendingmax, pendingcnt, ); + pendings [pendingcnt - 1].w = w; + pendings [pendingcnt - 1].events = events; + } } static void @@ -158,6 +197,22 @@ queue_events (W *events, int eventcnt, int type) event (events [i], type); } +/* called on EBADF to verify fds */ +static void +fd_recheck (void) +{ + int fd; + + for (fd = 0; fd < anfdmax; ++fd) + if (anfds [fd].wev) + if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) + while (anfds [fd].head) + { + event ((W)anfds [fd].head, EV_ERROR); + evio_stop (anfds [fd].head); + } +} + /*****************************************************************************/ static struct ev_timer **timers; @@ -283,11 +338,38 @@ siginit (void) static struct ev_idle **idles; static int idlemax, idlecnt; +static struct ev_prepare **prepares; +static int preparemax, preparecnt; + static struct ev_check **checks; static int checkmax, checkcnt; /*****************************************************************************/ +static struct ev_child *childs [PID_HASHSIZE]; +static struct ev_signal childev; + +#ifndef WCONTINUED +# define WCONTINUED 0 +#endif + +static void +childcb (struct ev_signal *sw, int revents) +{ + struct ev_child *w; + int pid, status; + + while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1) + for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next) + if (w->pid == pid || w->pid == -1) + { + w->status = status; + event ((W)w, EV_CHILD); + } +} + +/*****************************************************************************/ + #if HAVE_EPOLL # include "ev_epoll.c" #endif @@ -295,35 +377,53 @@ static int checkmax, checkcnt; # include "ev_select.c" #endif +int +ev_version_major (void) +{ + return EV_VERSION_MAJOR; +} + +int +ev_version_minor (void) +{ + return EV_VERSION_MINOR; +} + int ev_init (int flags) { + if (!ev_method) + { #if HAVE_MONOTONIC - { - struct timespec ts; - if (!clock_gettime (CLOCK_MONOTONIC, &ts)) - have_monotonic = 1; - } + { + struct timespec ts; + if (!clock_gettime (CLOCK_MONOTONIC, &ts)) + have_monotonic = 1; + } #endif - ev_now = ev_time (); - now = get_clock (); - diff = ev_now - now; + ev_now = ev_time (); + now = get_clock (); + diff = ev_now - now; - if (pipe (sigpipe)) - return 0; + if (pipe (sigpipe)) + return 0; - ev_method = EVMETHOD_NONE; + ev_method = EVMETHOD_NONE; #if HAVE_EPOLL - if (ev_method == EVMETHOD_NONE) epoll_init (flags); + if (ev_method == EVMETHOD_NONE) epoll_init (flags); #endif #if HAVE_SELECT - if (ev_method == EVMETHOD_NONE) select_init (flags); + if (ev_method == EVMETHOD_NONE) select_init (flags); #endif - if (ev_method) - { - evw_init (&sigev, sigcb); - siginit (); + if (ev_method) + { + evw_init (&sigev, sigcb); + siginit (); + + evsignal_init (&childev, childcb, SIGCHLD); + evsignal_start (&childev); + } } return ev_method; @@ -331,17 +431,20 @@ int ev_init (int flags) /*****************************************************************************/ -void ev_prefork (void) +void +ev_prefork (void) { /* nop */ } -void ev_postfork_parent (void) +void +ev_postfork_parent (void) { /* nop */ } -void ev_postfork_child (void) +void +ev_postfork_child (void) { #if HAVE_EPOLL if (ev_method == EVMETHOD_EPOLL) @@ -384,13 +487,11 @@ fd_reify (void) } static void -call_pending () +call_pending (void) { - int i; - - for (i = 0; i < pendingcnt; ++i) + while (pendingcnt) { - ANPENDING *p = pendings + i; + ANPENDING *p = pendings + --pendingcnt; if (p->w) { @@ -398,17 +499,17 @@ call_pending () p->w->cb (p->w, p->events); } } - - pendingcnt = 0; } static void -timers_reify () +timers_reify (void) { while (timercnt && timers [0]->at <= now) { struct ev_timer *w = timers [0]; + event ((W)w, EV_TIMEOUT); + /* first reschedule or stop timer */ if (w->repeat) { @@ -418,13 +519,11 @@ timers_reify () } else evtimer_stop (w); /* nonrepeating: stop timer */ - - event ((W)w, EV_TIMEOUT); } } static void -periodics_reify () +periodics_reify (void) { while (periodiccnt && periodics [0]->at <= ev_now) { @@ -470,7 +569,7 @@ periodics_reschedule (ev_tstamp diff) } static void -time_update () +time_update (void) { int i; @@ -516,20 +615,22 @@ void ev_loop (int flags) double block; ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0; - if (checkcnt) - { - queue_events ((W *)checks, checkcnt, EV_CHECK); - call_pending (); - } - do { + /* queue check watchers (and execute them) */ + if (preparecnt) + { + queue_events ((W *)prepares, preparecnt, EV_PREPARE); + call_pending (); + } + /* update fd-related kernel structures */ fd_reify (); /* calculate blocking time */ - /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */ + /* we only need this for !monotonic clockor timers, but as we basically + always have timers, we just calculate it always */ ev_now = ev_time (); if (flags & EVLOOP_NONBLOCK || idlecnt) @@ -540,7 +641,7 @@ void ev_loop (int flags) if (timercnt) { - ev_tstamp to = timers [0]->at - get_clock () + method_fudge; + ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge; if (block > to) block = to; } @@ -559,15 +660,16 @@ void ev_loop (int flags) time_update (); /* queue pending timers and reschedule them */ - periodics_reify (); /* absolute timers first */ - timers_reify (); /* relative timers second */ + timers_reify (); /* relative timers called last */ + periodics_reify (); /* absolute timers called first */ /* queue idle watchers unless io or timers are pending */ if (!pendingcnt) queue_events ((W *)idles, idlecnt, EV_IDLE); - /* queue check and possibly idle watchers */ - queue_events ((W *)checks, checkcnt, EV_CHECK); + /* queue check watchers, to be executed first */ + if (checkcnt) + queue_events ((W *)checks, checkcnt, EV_CHECK); call_pending (); } @@ -601,19 +703,25 @@ wlist_del (WL *head, WL elem) } } +static void +ev_clear (W w) +{ + if (w->pending) + { + pendings [w->pending - 1].w = 0; + w->pending = 0; + } +} + static void ev_start (W w, int active) { - w->pending = 0; w->active = active; } static void ev_stop (W w) { - if (w->pending) - pendings [w->pending - 1].w = 0; - w->active = 0; } @@ -639,6 +747,7 @@ evio_start (struct ev_io *w) void evio_stop (struct ev_io *w) { + ev_clear ((W)w); if (!ev_is_active (w)) return; @@ -650,7 +759,6 @@ evio_stop (struct ev_io *w) fdchanges [fdchangecnt - 1] = w->fd; } - void evtimer_start (struct ev_timer *w) { @@ -670,6 +778,7 @@ evtimer_start (struct ev_timer *w) void evtimer_stop (struct ev_timer *w) { + ev_clear ((W)w); if (!ev_is_active (w)) return; @@ -679,9 +788,28 @@ evtimer_stop (struct ev_timer *w) downheap ((WT *)timers, timercnt, w->active - 1); } + w->at = w->repeat; + ev_stop ((W)w); } +void +evtimer_again (struct ev_timer *w) +{ + if (ev_is_active (w)) + { + if (w->repeat) + { + w->at = now + w->repeat; + downheap ((WT *)timers, timercnt, w->active - 1); + } + else + evtimer_stop (w); + } + else if (w->repeat) + evtimer_start (w); +} + void evperiodic_start (struct ev_periodic *w) { @@ -703,6 +831,7 @@ evperiodic_start (struct ev_periodic *w) void evperiodic_stop (struct ev_periodic *w) { + ev_clear ((W)w); if (!ev_is_active (w)) return; @@ -738,6 +867,7 @@ evsignal_start (struct ev_signal *w) void evsignal_stop (struct ev_signal *w) { + ev_clear ((W)w); if (!ev_is_active (w)) return; @@ -760,10 +890,34 @@ void evidle_start (struct ev_idle *w) void evidle_stop (struct ev_idle *w) { + ev_clear ((W)w); + if (ev_is_active (w)) + return; + idles [w->active - 1] = idles [--idlecnt]; ev_stop ((W)w); } +void evprepare_start (struct ev_prepare *w) +{ + if (ev_is_active (w)) + return; + + ev_start ((W)w, ++preparecnt); + array_needsize (prepares, preparemax, preparecnt, ); + prepares [preparecnt - 1] = w; +} + +void evprepare_stop (struct ev_prepare *w) +{ + ev_clear ((W)w); + if (ev_is_active (w)) + return; + + prepares [w->active - 1] = prepares [--preparecnt]; + ev_stop ((W)w); +} + void evcheck_start (struct ev_check *w) { if (ev_is_active (w)) @@ -776,10 +930,98 @@ void evcheck_start (struct ev_check *w) void evcheck_stop (struct ev_check *w) { + ev_clear ((W)w); + if (ev_is_active (w)) + return; + checks [w->active - 1] = checks [--checkcnt]; ev_stop ((W)w); } +void evchild_start (struct ev_child *w) +{ + if (ev_is_active (w)) + return; + + ev_start ((W)w, 1); + wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w); +} + +void evchild_stop (struct ev_child *w) +{ + ev_clear ((W)w); + if (ev_is_active (w)) + return; + + wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w); + ev_stop ((W)w); +} + +/*****************************************************************************/ + +struct ev_once +{ + struct ev_io io; + struct ev_timer to; + void (*cb)(int revents, void *arg); + void *arg; +}; + +static void +once_cb (struct ev_once *once, int revents) +{ + void (*cb)(int revents, void *arg) = once->cb; + void *arg = once->arg; + + evio_stop (&once->io); + evtimer_stop (&once->to); + free (once); + + cb (revents, arg); +} + +static void +once_cb_io (struct ev_io *w, int revents) +{ + once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); +} + +static void +once_cb_to (struct ev_timer *w, int revents) +{ + once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); +} + +void +ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) +{ + struct ev_once *once = malloc (sizeof (struct ev_once)); + + if (!once) + cb (EV_ERROR, arg); + else + { + once->cb = cb; + once->arg = arg; + + evw_init (&once->io, once_cb_io); + + if (fd >= 0) + { + evio_set (&once->io, fd, events); + evio_start (&once->io); + } + + evw_init (&once->to, once_cb_to); + + if (timeout >= 0.) + { + evtimer_set (&once->to, timeout, 0.); + evtimer_start (&once->to); + } + } +} + /*****************************************************************************/ #if 0