X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/487c8aa2bb79f45c17a479dd48d8dc45948d2527..fa5f32e568e5e1f7bcb548b108379c434d253731:/ev.c?ds=sidebyside diff --git a/ev.c b/ev.c index a038613..8c3bf01 100644 --- a/ev.c +++ b/ev.c @@ -1,38 +1,72 @@ +/* + * 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. + */ +#if EV_USE_CONFIG_H +# include "config.h" +#endif + #include #include #include #include #include +#include #include #include #include +#include +#include #include #include -#define HAVE_EPOLL 1 - -#ifndef HAVE_MONOTONIC +#ifndef EV_USE_MONOTONIC # ifdef CLOCK_MONOTONIC -# define HAVE_MONOTONIC 1 +# define EV_USE_MONOTONIC 1 # endif #endif -#ifndef HAVE_SELECT -# define HAVE_SELECT 1 +#ifndef EV_USE_SELECT +# define EV_USE_SELECT 1 #endif -#ifndef HAVE_EPOLL -# define HAVE_EPOLL 0 +#ifndef EV_USE_EPOLL +# define EV_USE_EPOLL 0 #endif -#ifndef HAVE_REALTIME -# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ +#ifndef EV_USE_REALTIME +# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */ #endif #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ -#define MAX_BLOCKTIME 60. +#define MAX_BLOCKTIME 59.731 +#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */ #include "ev.h" @@ -55,7 +89,7 @@ static void (*method_poll)(ev_tstamp timeout); ev_tstamp ev_time (void) { -#if HAVE_REALTIME +#if EV_USE_REALTIME struct timespec ts; clock_gettime (CLOCK_REALTIME, &ts); return ts.tv_sec + ts.tv_nsec * 1e-9; @@ -69,7 +103,7 @@ ev_time (void) static ev_tstamp get_clock (void) { -#if HAVE_MONOTONIC +#if EV_USE_MONOTONIC if (have_monotonic) { struct timespec ts; @@ -81,11 +115,19 @@ get_clock (void) return ev_time (); } +#define array_nextsize(n) (((n) << 1) | 4 & ~3) +#define array_prevsize(n) (((n) >> 1) | 4 & ~3) + #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 = array_nextsize (newcnt); \ + } \ + while ((cnt) > newcnt); \ + \ base = realloc (base, sizeof (*base) * (newcnt)); \ init (base + cur, newcnt - cur); \ cur = newcnt; \ @@ -96,22 +138,19 @@ get_clock (void) typedef struct { struct ev_io *head; - unsigned char wev, rev; /* want, received event set */ + int events; } ANFD; static ANFD *anfds; static int anfdmax; -static int *fdchanges; -static int fdchangemax, fdchangecnt; - static void anfds_init (ANFD *base, int count) { while (count--) { - base->head = 0; - base->wev = base->rev = EV_NONE; + base->head = 0; + base->events = EV_NONE; ++base; } } @@ -128,10 +167,22 @@ 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 +queue_events (W *events, int eventcnt, int type) +{ + int i; + + for (i = 0; i < eventcnt; ++i) + event (events [i], type); } static void @@ -149,13 +200,66 @@ fd_event (int fd, int events) } } +/*****************************************************************************/ + +static int *fdchanges; +static int fdchangemax, fdchangecnt; + static void -queue_events (W *events, int eventcnt, int type) +fd_reify (void) { int i; - for (i = 0; i < eventcnt; ++i) - event (events [i], type); + for (i = 0; i < fdchangecnt; ++i) + { + int fd = fdchanges [i]; + ANFD *anfd = anfds + fd; + struct ev_io *w; + + int events = 0; + + for (w = anfd->head; w; w = w->next) + events |= w->events; + + anfd->events &= ~EV_REIFY; + + if (anfd->events != events) + { + method_modify (fd, anfd->events, events); + anfd->events = events; + } + } + + fdchangecnt = 0; +} + +static void +fd_change (int fd) +{ + if (anfds [fd].events & EV_REIFY || fdchangecnt < 0) + return; + + anfds [fd].events |= EV_REIFY; + + ++fdchangecnt; + array_needsize (fdchanges, fdchangemax, fdchangecnt, ); + fdchanges [fdchangecnt - 1] = fd; +} + +/* called on EBADF to verify fds */ +static void +fd_recheck (void) +{ + int fd; + + for (fd = 0; fd < anfdmax; ++fd) + if (anfds [fd].events) + if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) + while (anfds [fd].head) + { + event ((W)anfds [fd].head, EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT); + ev_io_stop (anfds [fd].head); + } } /*****************************************************************************/ @@ -274,8 +378,8 @@ siginit (void) fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); fcntl (sigpipe [1], F_SETFL, O_NONBLOCK); - evio_set (&sigev, sigpipe [0], EV_READ); - evio_start (&sigev); + ev_io_set (&sigev, sigpipe [0], EV_READ); + ev_io_start (&sigev); } /*****************************************************************************/ @@ -283,47 +387,92 @@ 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; /*****************************************************************************/ -#if HAVE_EPOLL +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 EV_USE_EPOLL # include "ev_epoll.c" #endif -#if HAVE_SELECT +#if EV_USE_SELECT # 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 HAVE_MONOTONIC - { - struct timespec ts; - if (!clock_gettime (CLOCK_MONOTONIC, &ts)) - have_monotonic = 1; - } + if (!ev_method) + { +#if EV_USE_MONOTONIC + { + 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; -#if HAVE_EPOLL - if (ev_method == EVMETHOD_NONE) epoll_init (flags); + ev_method = EVMETHOD_NONE; +#if EV_USE_EPOLL + if (ev_method == EVMETHOD_NONE) epoll_init (flags); #endif -#if HAVE_SELECT - if (ev_method == EVMETHOD_NONE) select_init (flags); +#if EV_USE_SELECT + if (ev_method == EVMETHOD_NONE) select_init (flags); #endif - if (ev_method) - { - evw_init (&sigev, sigcb); - siginit (); + if (ev_method) + { + ev_watcher_init (&sigev, sigcb); + siginit (); + + ev_signal_init (&childev, childcb, SIGCHLD); + ev_signal_start (&childev); + } } return ev_method; @@ -331,24 +480,27 @@ 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_USE_EPOLL if (ev_method == EVMETHOD_EPOLL) epoll_postfork_child (); #endif - evio_stop (&sigev); + ev_io_stop (&sigev); close (sigpipe [0]); close (sigpipe [1]); pipe (sigpipe); @@ -358,39 +510,11 @@ void ev_postfork_child (void) /*****************************************************************************/ static void -fd_reify (void) -{ - int i; - - for (i = 0; i < fdchangecnt; ++i) - { - int fd = fdchanges [i]; - ANFD *anfd = anfds + fd; - struct ev_io *w; - - int wev = 0; - - for (w = anfd->head; w; w = w->next) - wev |= w->events; - - if (anfd->wev != wev) - { - method_modify (fd, anfd->wev, wev); - anfd->wev = wev; - } - } - - fdchangecnt = 0; -} - -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 +522,17 @@ 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) { @@ -417,14 +541,12 @@ timers_reify () downheap ((WT *)timers, timercnt, 0); } else - evtimer_stop (w); /* nonrepeating: stop timer */ - - event ((W)w, EV_TIMEOUT); + ev_timer_stop (w); /* nonrepeating: stop timer */ } } static void -periodics_reify () +periodics_reify (void) { while (periodiccnt && periodics [0]->at <= ev_now) { @@ -438,7 +560,7 @@ periodics_reify () downheap ((WT *)periodics, periodiccnt, 0); } else - evperiodic_stop (w); /* nonrepeating: stop timer */ + ev_periodic_stop (w); /* nonrepeating: stop timer */ event ((W)w, EV_TIMEOUT); } @@ -460,8 +582,8 @@ periodics_reschedule (ev_tstamp diff) if (fabs (diff) >= 1e-4) { - evperiodic_stop (w); - evperiodic_start (w); + ev_periodic_stop (w); + ev_periodic_start (w); i = 0; /* restart loop, inefficient, but time jumps should be rare */ } @@ -470,7 +592,7 @@ periodics_reschedule (ev_tstamp diff) } static void -time_update () +time_update (void) { int i; @@ -514,22 +636,24 @@ int ev_loop_done; 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 (); - } + ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0; 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 +664,7 @@ 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 +683,16 @@ 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 (); } @@ -601,26 +726,32 @@ 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; } /*****************************************************************************/ void -evio_start (struct ev_io *w) +ev_io_start (struct ev_io *w) { if (ev_is_active (w)) return; @@ -631,28 +762,24 @@ evio_start (struct ev_io *w) array_needsize (anfds, anfdmax, fd + 1, anfds_init); wlist_add ((WL *)&anfds[fd].head, (WL)w); - ++fdchangecnt; - array_needsize (fdchanges, fdchangemax, fdchangecnt, ); - fdchanges [fdchangecnt - 1] = fd; + fd_change (fd); } void -evio_stop (struct ev_io *w) +ev_io_stop (struct ev_io *w) { + ev_clear ((W)w); if (!ev_is_active (w)) return; wlist_del ((WL *)&anfds[w->fd].head, (WL)w); ev_stop ((W)w); - ++fdchangecnt; - array_needsize (fdchanges, fdchangemax, fdchangecnt, ); - fdchanges [fdchangecnt - 1] = w->fd; + fd_change (w->fd); } - void -evtimer_start (struct ev_timer *w) +ev_timer_start (struct ev_timer *w) { if (ev_is_active (w)) return; @@ -668,8 +795,9 @@ evtimer_start (struct ev_timer *w) } void -evtimer_stop (struct ev_timer *w) +ev_timer_stop (struct ev_timer *w) { + ev_clear ((W)w); if (!ev_is_active (w)) return; @@ -679,11 +807,30 @@ evtimer_stop (struct ev_timer *w) downheap ((WT *)timers, timercnt, w->active - 1); } + w->at = w->repeat; + ev_stop ((W)w); } void -evperiodic_start (struct ev_periodic *w) +ev_timer_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 + ev_timer_stop (w); + } + else if (w->repeat) + ev_timer_start (w); +} + +void +ev_periodic_start (struct ev_periodic *w) { if (ev_is_active (w)) return; @@ -701,8 +848,9 @@ evperiodic_start (struct ev_periodic *w) } void -evperiodic_stop (struct ev_periodic *w) +ev_periodic_stop (struct ev_periodic *w) { + ev_clear ((W)w); if (!ev_is_active (w)) return; @@ -716,7 +864,7 @@ evperiodic_stop (struct ev_periodic *w) } void -evsignal_start (struct ev_signal *w) +ev_signal_start (struct ev_signal *w) { if (ev_is_active (w)) return; @@ -736,8 +884,9 @@ evsignal_start (struct ev_signal *w) } void -evsignal_stop (struct ev_signal *w) +ev_signal_stop (struct ev_signal *w) { + ev_clear ((W)w); if (!ev_is_active (w)) return; @@ -748,7 +897,8 @@ evsignal_stop (struct ev_signal *w) signal (w->signum, SIG_DFL); } -void evidle_start (struct ev_idle *w) +void +ev_idle_start (struct ev_idle *w) { if (ev_is_active (w)) return; @@ -758,13 +908,41 @@ void evidle_start (struct ev_idle *w) idles [idlecnt - 1] = w; } -void evidle_stop (struct ev_idle *w) +void +ev_idle_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 evcheck_start (struct ev_check *w) +void +ev_prepare_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 +ev_prepare_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 +ev_check_start (struct ev_check *w) { if (ev_is_active (w)) return; @@ -774,12 +952,101 @@ void evcheck_start (struct ev_check *w) checks [checkcnt - 1] = w; } -void evcheck_stop (struct ev_check *w) +void +ev_check_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 +ev_child_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 +ev_child_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; + + ev_io_stop (&once->io); + ev_timer_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 | EV_READ | EV_WRITE | EV_TIMEOUT, arg); + else + { + once->cb = cb; + once->arg = arg; + + ev_watcher_init (&once->io, once_cb_io); + if (fd >= 0) + { + ev_io_set (&once->io, fd, events); + ev_io_start (&once->io); + } + + ev_watcher_init (&once->to, once_cb_to); + if (timeout >= 0.) + { + ev_timer_set (&once->to, timeout, 0.); + ev_timer_start (&once->to); + } + } +} + /*****************************************************************************/ #if 0 @@ -796,16 +1063,16 @@ static void ocb (struct ev_timer *w, int revents) { //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); - evtimer_stop (w); - evtimer_start (w); + ev_timer_stop (w); + ev_timer_start (w); } static void scb (struct ev_signal *w, int revents) { fprintf (stderr, "signal %x,%d\n", revents, w->signum); - evio_stop (&wio); - evio_start (&wio); + ev_io_stop (&wio); + ev_io_start (&wio); } static void @@ -819,8 +1086,8 @@ int main (void) { ev_init (0); - evio_init (&wio, sin_cb, 0, EV_READ); - evio_start (&wio); + ev_io_init (&wio, sin_cb, 0, EV_READ); + ev_io_start (&wio); struct ev_timer t[10000]; @@ -829,29 +1096,29 @@ int main (void) for (i = 0; i < 10000; ++i) { struct ev_timer *w = t + i; - evw_init (w, ocb, i); - evtimer_init_abs (w, ocb, drand48 (), 0.99775533); - evtimer_start (w); + ev_watcher_init (w, ocb, i); + ev_timer_init_abs (w, ocb, drand48 (), 0.99775533); + ev_timer_start (w); if (drand48 () < 0.5) - evtimer_stop (w); + ev_timer_stop (w); } #endif struct ev_timer t1; - evtimer_init (&t1, ocb, 5, 10); - evtimer_start (&t1); + ev_timer_init (&t1, ocb, 5, 10); + ev_timer_start (&t1); struct ev_signal sig; - evsignal_init (&sig, scb, SIGQUIT); - evsignal_start (&sig); + ev_signal_init (&sig, scb, SIGQUIT); + ev_signal_start (&sig); struct ev_check cw; - evcheck_init (&cw, gcb); - evcheck_start (&cw); + ev_check_init (&cw, gcb); + ev_check_start (&cw); struct ev_idle iw; - evidle_init (&iw, gcb); - evidle_start (&iw); + ev_idle_init (&iw, gcb); + ev_idle_start (&iw); ev_loop (0);