X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/6c9b968485dc8690f81ae6626c07a82a4e085eb1..85e9d898522a460b8dcf57f1781f6acc3d2f3ee5:/ev.c?ds=sidebyside diff --git a/ev.c b/ev.c index 5b59ae1..e3e7e57 100644 --- a/ev.c +++ b/ev.c @@ -1,53 +1,244 @@ +/* + * libev event processing core, watcher management + * + * 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. + */ +#ifndef EV_STANDALONE +# include "config.h" + +# if HAVE_CLOCK_GETTIME +# define EV_USE_MONOTONIC 1 +# define EV_USE_REALTIME 1 +# endif + +# if HAVE_SELECT && HAVE_SYS_SELECT_H +# define EV_USE_SELECT 1 +# endif + +# if HAVE_POLL && HAVE_POLL_H +# define EV_USE_POLL 1 +# endif + +# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H +# define EV_USE_EPOLL 1 +# endif + +# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H +# define EV_USE_KQUEUE 1 +# endif + +#endif + #include #include -#include #include -#include +#include #include #include #include -#include +#include #include -#ifdef CLOCK_MONOTONIC -# define HAVE_MONOTONIC 1 +#include + +#ifndef WIN32 +# include +# include +# include +#endif +/**/ + +#ifndef EV_USE_MONOTONIC +# define EV_USE_MONOTONIC 1 #endif -#define HAVE_REALTIME 1 -#define HAVE_EPOLL 1 -#define HAVE_SELECT 1 +#ifndef EV_USE_SELECT +# define EV_USE_SELECT 1 +#endif + +#ifndef EV_USE_POLL +# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */ +#endif + +#ifndef EV_USE_EPOLL +# define EV_USE_EPOLL 0 +#endif + +#ifndef EV_USE_KQUEUE +# define EV_USE_KQUEUE 0 +#endif + +#ifndef EV_USE_WIN32 +# ifdef WIN32 +# define EV_USE_WIN32 0 /* it does not exist, use select */ +# undef EV_USE_SELECT +# define EV_USE_SELECT 1 +# else +# define EV_USE_WIN32 0 +# endif +#endif + +#ifndef EV_USE_REALTIME +# define EV_USE_REALTIME 1 +#endif + +/**/ + +#ifndef CLOCK_MONOTONIC +# undef EV_USE_MONOTONIC +# define EV_USE_MONOTONIC 0 +#endif + +#ifndef CLOCK_REALTIME +# undef EV_USE_REALTIME +# define EV_USE_REALTIME 0 +#endif + +/**/ #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ -#define MAX_BLOCKTIME 60. +#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */ +#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */ +/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */ #include "ev.h" -struct ev_watcher { - EV_WATCHER (ev_watcher); -}; +#if __GNUC__ >= 3 +# define expect(expr,value) __builtin_expect ((expr),(value)) +# define inline inline +#else +# define expect(expr,value) (expr) +# define inline static +#endif + +#define expect_false(expr) expect ((expr) != 0, 0) +#define expect_true(expr) expect ((expr) != 0, 1) + +#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1) +#define ABSPRI(w) ((w)->priority - EV_MINPRI) + +typedef struct ev_watcher *W; +typedef struct ev_watcher_list *WL; +typedef struct ev_watcher_time *WT; -struct ev_watcher_list { - EV_WATCHER_LIST (ev_watcher_list); +static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */ + +#include "ev_win32.c" + +/*****************************************************************************/ + +static void (*syserr_cb)(const char *msg); + +void ev_set_syserr_cb (void (*cb)(const char *msg)) +{ + syserr_cb = cb; +} + +static void +syserr (const char *msg) +{ + if (!msg) + msg = "(libev) system error"; + + if (syserr_cb) + syserr_cb (msg); + else + { + perror (msg); + abort (); + } +} + +static void *(*alloc)(void *ptr, long size); + +void ev_set_allocator (void *(*cb)(void *ptr, long size)) +{ + alloc = cb; +} + +static void * +ev_realloc (void *ptr, long size) +{ + ptr = alloc ? alloc (ptr, size) : realloc (ptr, size); + + if (!ptr && size) + { + fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size); + abort (); + } + + return ptr; +} + +#define ev_malloc(size) ev_realloc (0, (size)) +#define ev_free(ptr) ev_realloc ((ptr), 0) + +/*****************************************************************************/ + +typedef struct +{ + WL head; + unsigned char events; + unsigned char reify; +} ANFD; + +typedef struct +{ + W w; + int events; +} ANPENDING; + +#if EV_MULTIPLICITY + +struct ev_loop +{ +# define VAR(name,decl) decl; +# include "ev_vars.h" }; +# undef VAR +# include "ev_wrap.h" -static ev_tstamp now, diff; /* monotonic clock */ -ev_tstamp ev_now; -int ev_method; +#else -static int have_monotonic; /* runtime */ +# define VAR(name,decl) static decl; +# include "ev_vars.h" +# undef VAR -static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ -static void (*method_modify)(int fd, int oev, int nev); -static void (*method_poll)(ev_tstamp timeout); +#endif /*****************************************************************************/ -ev_tstamp +inline 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; @@ -58,11 +249,11 @@ ev_time (void) #endif } -static ev_tstamp +inline ev_tstamp get_clock (void) { -#if HAVE_MONOTONIC - if (have_monotonic) +#if EV_USE_MONOTONIC + if (expect_true (have_monotonic)) { struct timespec ts; clock_gettime (CLOCK_MONOTONIC, &ts); @@ -73,145 +264,258 @@ get_clock (void) return ev_time (); } -#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);\ - base = realloc (base, sizeof (*base) * (newcnt)); \ - init (base + cur, newcnt - cur); \ - cur = newcnt; \ +ev_tstamp +ev_now (EV_P) +{ + return rt_now; +} + +#define array_roundsize(type,n) ((n) | 4 & ~3) + +#define array_needsize(type,base,cur,cnt,init) \ + if (expect_false ((cnt) > cur)) \ + { \ + int newcnt = cur; \ + do \ + { \ + newcnt = array_roundsize (type, newcnt << 1); \ + } \ + while ((cnt) > newcnt); \ + \ + base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\ + init (base + cur, newcnt - cur); \ + cur = newcnt; \ } -/*****************************************************************************/ +#define array_slim(type,stem) \ + if (stem ## max < array_roundsize (stem ## cnt >> 2)) \ + { \ + stem ## max = array_roundsize (stem ## cnt >> 1); \ + base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\ + fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\ + } -typedef struct -{ - struct ev_io *head; - unsigned char wev, rev; /* want, received event set */ -} ANFD; +/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */ +/* bringing us everlasting joy in form of stupid extra macros that are not required in C */ +#define array_free_microshit(stem) \ + ev_free (stem ## s); stem ## cnt = stem ## max = 0; -static ANFD *anfds; -static int anfdmax; +#define array_free(stem, idx) \ + ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; -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->reify = 0; + ++base; } } -typedef struct +static void +event (EV_P_ W w, int events) { - struct ev_watcher *w; - int events; -} ANPENDING; + if (w->pending) + { + pendings [ABSPRI (w)][w->pending - 1].events |= events; + return; + } -static ANPENDING *pendings; -static int pendingmax, pendingcnt; + w->pending = ++pendingcnt [ABSPRI (w)]; + array_needsize (ANPENDING, pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void)); + pendings [ABSPRI (w)][w->pending - 1].w = w; + pendings [ABSPRI (w)][w->pending - 1].events = events; +} static void -event (struct ev_watcher *w, int events) +queue_events (EV_P_ W *events, int eventcnt, int type) { - w->pending = ++pendingcnt; - array_needsize (pendings, pendingmax, pendingcnt, ); - pendings [pendingcnt - 1].w = w; - pendings [pendingcnt - 1].events = events; + int i; + + for (i = 0; i < eventcnt; ++i) + event (EV_A_ events [i], type); } static void -fd_event (int fd, int events) +fd_event (EV_P_ int fd, int events) { ANFD *anfd = anfds + fd; struct ev_io *w; - for (w = anfd->head; w; w = w->next) + for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next) { int ev = w->events & events; if (ev) - event ((struct ev_watcher *)w, ev); + event (EV_A_ (W)w, ev); } } +/*****************************************************************************/ + static void -queue_events (struct ev_watcher **events, int eventcnt, int type) +fd_reify (EV_P) { 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 = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next) + events |= w->events; + + anfd->reify = 0; + + method_modify (EV_A_ fd, anfd->events, events); + anfd->events = events; + } + + fdchangecnt = 0; } -/*****************************************************************************/ +static void +fd_change (EV_P_ int fd) +{ + if (anfds [fd].reify) + return; + + anfds [fd].reify = 1; + + ++fdchangecnt; + array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void)); + fdchanges [fdchangecnt - 1] = fd; +} + +static void +fd_kill (EV_P_ int fd) +{ + struct ev_io *w; + + while ((w = (struct ev_io *)anfds [fd].head)) + { + ev_io_stop (EV_A_ w); + event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE); + } +} + +static int +fd_valid (int fd) +{ +#ifdef WIN32 + return !!win32_get_osfhandle (fd); +#else + return fcntl (fd, F_GETFD) != -1; +#endif +} -static struct ev_timer **atimers; -static int atimermax, atimercnt; +/* called on EBADF to verify fds */ +static void +fd_ebadf (EV_P) +{ + int fd; + + for (fd = 0; fd < anfdmax; ++fd) + if (anfds [fd].events) + if (!fd_valid (fd) == -1 && errno == EBADF) + fd_kill (EV_A_ fd); +} -static struct ev_timer **rtimers; -static int rtimermax, rtimercnt; +/* called on ENOMEM in select/poll to kill some fds and retry */ +static void +fd_enomem (EV_P) +{ + int fd; + + for (fd = anfdmax; fd--; ) + if (anfds [fd].events) + { + fd_kill (EV_A_ fd); + return; + } +} + +/* usually called after fork if method needs to re-arm all fds from scratch */ +static void +fd_rearm_all (EV_P) +{ + int fd; + + /* this should be highly optimised to not do anything but set a flag */ + for (fd = 0; fd < anfdmax; ++fd) + if (anfds [fd].events) + { + anfds [fd].events = 0; + fd_change (EV_A_ fd); + } +} + +/*****************************************************************************/ static void -upheap (struct ev_timer **timers, int k) +upheap (WT *heap, int k) { - struct ev_timer *w = timers [k]; + WT w = heap [k]; - while (k && timers [k >> 1]->at > w->at) + while (k && heap [k >> 1]->at > w->at) { - timers [k] = timers [k >> 1]; - timers [k]->active = k + 1; + heap [k] = heap [k >> 1]; + ((W)heap [k])->active = k + 1; k >>= 1; } - timers [k] = w; - timers [k]->active = k + 1; + heap [k] = w; + ((W)heap [k])->active = k + 1; } static void -downheap (struct ev_timer **timers, int N, int k) +downheap (WT *heap, int N, int k) { - struct ev_timer *w = timers [k]; + WT w = heap [k]; while (k < (N >> 1)) { int j = k << 1; - if (j + 1 < N && timers [j]->at > timers [j + 1]->at) + if (j + 1 < N && heap [j]->at > heap [j + 1]->at) ++j; - if (w->at <= timers [j]->at) + if (w->at <= heap [j]->at) break; - timers [k] = timers [j]; - timers [k]->active = k + 1; + heap [k] = heap [j]; + ((W)heap [k])->active = k + 1; k = j; } - timers [k] = w; - timers [k]->active = k + 1; + heap [k] = w; + ((W)heap [k])->active = k + 1; } /*****************************************************************************/ typedef struct { - struct ev_signal *head; - sig_atomic_t gotsig; + WL head; + sig_atomic_t volatile gotsig; } ANSIG; static ANSIG *signals; static int signalmax; static int sigpipe [2]; -static sig_atomic_t gotsig; +static sig_atomic_t volatile gotsig; static struct ev_io sigev; static void @@ -221,6 +525,7 @@ signals_init (ANSIG *base, int count) { base->head = 0; base->gotsig = 0; + ++base; } } @@ -228,313 +533,631 @@ signals_init (ANSIG *base, int count) static void sighandler (int signum) { +#if WIN32 + signal (signum, sighandler); +#endif + signals [signum - 1].gotsig = 1; if (!gotsig) { + int old_errno = errno; gotsig = 1; - write (sigpipe [1], &gotsig, 1); + write (sigpipe [1], &signum, 1); + errno = old_errno; } } static void -sigcb (struct ev_io *iow, int revents) +sigcb (EV_P_ struct ev_io *iow, int revents) { - struct ev_signal *w; - int sig; + WL w; + int signum; - gotsig = 0; read (sigpipe [0], &revents, 1); + gotsig = 0; - for (sig = signalmax; sig--; ) - if (signals [sig].gotsig) + for (signum = signalmax; signum--; ) + if (signals [signum].gotsig) { - signals [sig].gotsig = 0; + signals [signum].gotsig = 0; - for (w = signals [sig].head; w; w = w->next) - event ((struct ev_watcher *)w, EV_SIGNAL); + for (w = signals [signum].head; w; w = w->next) + event (EV_A_ (W)w, EV_SIGNAL); } } static void -siginit (void) +siginit (EV_P) { +#ifndef WIN32 fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC); /* rather than sort out wether we really need nb, set it */ fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); fcntl (sigpipe [1], F_SETFL, O_NONBLOCK); +#endif - evio_set (&sigev, sigpipe [0], EV_READ); - evio_start (&sigev); + ev_io_set (&sigev, sigpipe [0], EV_READ); + ev_io_start (EV_A_ &sigev); + ev_unref (EV_A); /* child watcher should not keep loop alive */ } /*****************************************************************************/ -static struct ev_idle **idles; -static int idlemax, idlecnt; +static struct ev_child *childs [PID_HASHSIZE]; + +#ifndef WIN32 + +static struct ev_signal childev; -static struct ev_check **checks; -static int checkmax, checkcnt; +#ifndef WCONTINUED +# define WCONTINUED 0 +#endif + +static void +child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status) +{ + struct ev_child *w; + + for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next) + if (w->pid == pid || !w->pid) + { + ev_priority (w) = ev_priority (sw); /* need to do it *now* */ + w->rpid = pid; + w->rstatus = status; + event (EV_A_ (W)w, EV_CHILD); + } +} + +static void +childcb (EV_P_ struct ev_signal *sw, int revents) +{ + int pid, status; + + if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED))) + { + /* make sure we are called again until all childs have been reaped */ + event (EV_A_ (W)sw, EV_SIGNAL); + + child_reap (EV_A_ sw, pid, pid, status); + child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */ + } +} + +#endif /*****************************************************************************/ -#if HAVE_EPOLL +#if EV_USE_KQUEUE +# include "ev_kqueue.c" +#endif +#if EV_USE_EPOLL # include "ev_epoll.c" #endif -#if HAVE_SELECT +#if EV_USE_POLL +# include "ev_poll.c" +#endif +#if EV_USE_SELECT # include "ev_select.c" #endif -int ev_init (int flags) +int +ev_version_major (void) +{ + return EV_VERSION_MAJOR; +} + +int +ev_version_minor (void) { -#if HAVE_MONOTONIC - { - struct timespec ts; - if (!clock_gettime (CLOCK_MONOTONIC, &ts)) - have_monotonic = 1; - } + return EV_VERSION_MINOR; +} + +/* return true if we are running with elevated privileges and should ignore env variables */ +static int +enable_secure (void) +{ +#ifdef WIN32 + return 0; +#else + return getuid () != geteuid () + || getgid () != getegid (); +#endif +} + +int +ev_method (EV_P) +{ + return method; +} + +static void +loop_init (EV_P_ int methods) +{ + if (!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; + rt_now = ev_time (); + mn_now = get_clock (); + now_floor = mn_now; + rtmn_diff = rt_now - mn_now; - if (pipe (sigpipe)) - return 0; + if (methods == EVMETHOD_AUTO) + if (!enable_secure () && getenv ("LIBEV_METHODS")) + methods = atoi (getenv ("LIBEV_METHODS")); + else + methods = EVMETHOD_ANY; - ev_method = EVMETHOD_NONE; -#if HAVE_EPOLL - if (ev_method == EVMETHOD_NONE) epoll_init (flags); + method = 0; +#if EV_USE_WIN32 + if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods); #endif -#if HAVE_SELECT - if (ev_method == EVMETHOD_NONE) select_init (flags); +#if EV_USE_KQUEUE + if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods); +#endif +#if EV_USE_EPOLL + if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods); +#endif +#if EV_USE_POLL + if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods); +#endif +#if EV_USE_SELECT + if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods); #endif - if (ev_method) - { - evw_init (&sigev, sigcb, 0); - siginit (); + ev_watcher_init (&sigev, sigcb); + ev_set_priority (&sigev, EV_MAXPRI); } +} + +void +loop_destroy (EV_P) +{ + int i; + +#if EV_USE_WIN32 + if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A); +#endif +#if EV_USE_KQUEUE + if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A); +#endif +#if EV_USE_EPOLL + if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A); +#endif +#if EV_USE_POLL + if (method == EVMETHOD_POLL ) poll_destroy (EV_A); +#endif +#if EV_USE_SELECT + if (method == EVMETHOD_SELECT) select_destroy (EV_A); +#endif - return ev_method; + for (i = NUMPRI; i--; ) + array_free (pending, [i]); + + /* have to use the microsoft-never-gets-it-right macro */ + array_free_microshit (fdchange); + array_free_microshit (timer); + array_free_microshit (periodic); + array_free_microshit (idle); + array_free_microshit (prepare); + array_free_microshit (check); + + method = 0; } -/*****************************************************************************/ +static void +loop_fork (EV_P) +{ +#if EV_USE_EPOLL + if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A); +#endif +#if EV_USE_KQUEUE + if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A); +#endif + + if (ev_is_active (&sigev)) + { + /* default loop */ + + ev_ref (EV_A); + ev_io_stop (EV_A_ &sigev); + close (sigpipe [0]); + close (sigpipe [1]); + + while (pipe (sigpipe)) + syserr ("(libev) error creating pipe"); + + siginit (EV_A); + } + + postfork = 0; +} -void ev_prefork (void) +#if EV_MULTIPLICITY +struct ev_loop * +ev_loop_new (int methods) { + struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop)); + + memset (loop, 0, sizeof (struct ev_loop)); + + loop_init (EV_A_ methods); + + if (ev_method (EV_A)) + return loop; + + return 0; } -void ev_postfork_parent (void) +void +ev_loop_destroy (EV_P) { + loop_destroy (EV_A); + ev_free (loop); } -void ev_postfork_child (void) +void +ev_loop_fork (EV_P) { -#if HAVE_EPOLL - if (ev_method == EVMETHOD_EPOLL) - epoll_postfork_child (); + postfork = 1; +} + #endif - evio_stop (&sigev); - close (sigpipe [0]); - close (sigpipe [1]); - pipe (sigpipe); - siginit (); -} +#if EV_MULTIPLICITY +struct ev_loop default_loop_struct; +static struct ev_loop *default_loop; -/*****************************************************************************/ +struct ev_loop * +#else +static int default_loop; -static void -fd_reify (void) +int +#endif +ev_default_loop (int methods) { - int i; + if (sigpipe [0] == sigpipe [1]) + if (pipe (sigpipe)) + return 0; - for (i = 0; i < fdchangecnt; ++i) + if (!default_loop) { - int fd = fdchanges [i]; - ANFD *anfd = anfds + fd; - struct ev_io *w; - - int wev = 0; +#if EV_MULTIPLICITY + struct ev_loop *loop = default_loop = &default_loop_struct; +#else + default_loop = 1; +#endif - for (w = anfd->head; w; w = w->next) - wev |= w->events; + loop_init (EV_A_ methods); - if (anfd->wev != wev) + if (ev_method (EV_A)) { - method_modify (fd, anfd->wev, wev); - anfd->wev = wev; + siginit (EV_A); + +#ifndef WIN32 + ev_signal_init (&childev, childcb, SIGCHLD); + ev_set_priority (&childev, EV_MAXPRI); + ev_signal_start (EV_A_ &childev); + ev_unref (EV_A); /* child watcher should not keep loop alive */ +#endif } + else + default_loop = 0; } - fdchangecnt = 0; + return default_loop; } -static void -call_pending () +void +ev_default_destroy (void) { - int i; +#if EV_MULTIPLICITY + struct ev_loop *loop = default_loop; +#endif - for (i = 0; i < pendingcnt; ++i) - { - ANPENDING *p = pendings + i; +#ifndef WIN32 + ev_ref (EV_A); /* child watcher */ + ev_signal_stop (EV_A_ &childev); +#endif - if (p->w) - { - p->w->pending = 0; - p->w->cb (p->w, p->events); - } - } + ev_ref (EV_A); /* signal watcher */ + ev_io_stop (EV_A_ &sigev); + + close (sigpipe [0]); sigpipe [0] = 0; + close (sigpipe [1]); sigpipe [1] = 0; + + loop_destroy (EV_A); +} + +void +ev_default_fork (void) +{ +#if EV_MULTIPLICITY + struct ev_loop *loop = default_loop; +#endif + + if (method) + postfork = 1; +} + +/*****************************************************************************/ - pendingcnt = 0; +static void +call_pending (EV_P) +{ + int pri; + + for (pri = NUMPRI; pri--; ) + while (pendingcnt [pri]) + { + ANPENDING *p = pendings [pri] + --pendingcnt [pri]; + + if (p->w) + { + p->w->pending = 0; + p->w->cb (EV_A_ p->w, p->events); + } + } } static void -timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) +timers_reify (EV_P) { - while (timercnt && timers [0]->at <= now) + while (timercnt && ((WT)timers [0])->at <= mn_now) { struct ev_timer *w = timers [0]; + assert (("inactive timer on timer heap detected", ev_is_active (w))); + /* first reschedule or stop timer */ if (w->repeat) { - if (w->is_abs) - w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat; - else - w->at = now + w->repeat; - - assert (w->at > now); - - downheap (timers, timercnt, 0); + assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.)); + ((WT)w)->at = mn_now + w->repeat; + downheap ((WT *)timers, timercnt, 0); } else + ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */ + + event (EV_A_ (W)w, EV_TIMEOUT); + } +} + +static void +periodics_reify (EV_P) +{ + while (periodiccnt && ((WT)periodics [0])->at <= rt_now) + { + struct ev_periodic *w = periodics [0]; + + assert (("inactive timer on periodic heap detected", ev_is_active (w))); + + /* first reschedule or stop timer */ + if (w->interval) { - evtimer_stop (w); /* nonrepeating: stop timer */ - --timercnt; /* maybe pass by reference instead? */ + ((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval; + assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now)); + downheap ((WT *)periodics, periodiccnt, 0); } + else + ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */ - event ((struct ev_watcher *)w, EV_TIMEOUT); + event (EV_A_ (W)w, EV_PERIODIC); } } static void -time_update () +periodics_reschedule (EV_P) { int i; - ev_now = ev_time (); - if (have_monotonic) + /* adjust periodics after time jump */ + for (i = 0; i < periodiccnt; ++i) { - ev_tstamp odiff = diff; + struct ev_periodic *w = periodics [i]; - /* detecting time jumps is much more difficult */ - for (i = 2; --i; ) /* loop a few times, before making important decisions */ + if (w->interval) { - now = get_clock (); - diff = ev_now - now; + ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval; - if (fabs (odiff - diff) < MIN_TIMEJUMP) - return; /* all is well */ + if (fabs (diff) >= 1e-4) + { + ev_periodic_stop (EV_A_ w); + ev_periodic_start (EV_A_ w); - ev_now = ev_time (); + i = 0; /* restart loop, inefficient, but time jumps should be rare */ + } } + } +} - /* time jump detected, reschedule atimers */ - for (i = 0; i < atimercnt; ++i) +inline int +time_update_monotonic (EV_P) +{ + mn_now = get_clock (); + + if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5)) + { + rt_now = rtmn_diff + mn_now; + return 0; + } + else + { + now_floor = mn_now; + rt_now = ev_time (); + return 1; + } +} + +static void +time_update (EV_P) +{ + int i; + +#if EV_USE_MONOTONIC + if (expect_true (have_monotonic)) + { + if (time_update_monotonic (EV_A)) { - struct ev_timer *w = atimers [i]; - w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; + ev_tstamp odiff = rtmn_diff; + + for (i = 4; --i; ) /* loop a few times, before making important decisions */ + { + rtmn_diff = rt_now - mn_now; + + if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP) + return; /* all is well */ + + rt_now = ev_time (); + mn_now = get_clock (); + now_floor = mn_now; + } + + periodics_reschedule (EV_A); + /* no timer adjustment, as the monotonic clock doesn't jump */ + /* timers_reschedule (EV_A_ rtmn_diff - odiff) */ } } else +#endif { - if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) - /* time jump detected, adjust rtimers */ - for (i = 0; i < rtimercnt; ++i) - rtimers [i]->at += ev_now - now; + rt_now = ev_time (); + + if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP)) + { + periodics_reschedule (EV_A); - now = ev_now; + /* adjust timers. this is easy, as the offset is the same for all */ + for (i = 0; i < timercnt; ++i) + ((WT)timers [i])->at += rt_now - mn_now; + } + + mn_now = rt_now; } } -int ev_loop_done; +void +ev_ref (EV_P) +{ + ++activecnt; +} -void ev_loop (int flags) +void +ev_unref (EV_P) { - double block; - ev_loop_done = flags & EVLOOP_ONESHOT; + --activecnt; +} - if (checkcnt) - { - queue_events (checks, checkcnt, EV_CHECK); - call_pending (); - } +static int loop_done; + +void +ev_loop (EV_P_ int flags) +{ + double block; + loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0; do { + /* queue check watchers (and execute them) */ + if (expect_false (preparecnt)) + { + queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE); + call_pending (EV_A); + } + + /* we might have forked, so reify kernel state if necessary */ + if (expect_false (postfork)) + loop_fork (EV_A); + /* update fd-related kernel structures */ - fd_reify (); + fd_reify (EV_A); /* calculate blocking time */ + + /* we only need this for !monotonic clockor timers, but as we basically + always have timers, we just calculate it always */ +#if EV_USE_MONOTONIC + if (expect_true (have_monotonic)) + time_update_monotonic (EV_A); + else +#endif + { + rt_now = ev_time (); + mn_now = rt_now; + } + if (flags & EVLOOP_NONBLOCK || idlecnt) block = 0.; else { block = MAX_BLOCKTIME; - if (rtimercnt) + if (timercnt) { - ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge; + ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge; if (block > to) block = to; } - if (atimercnt) + if (periodiccnt) { - ev_tstamp to = atimers [0]->at - ev_time () + method_fudge; + ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge; if (block > to) block = to; } if (block < 0.) block = 0.; } - method_poll (block); + method_poll (EV_A_ block); - /* update ev_now, do magic */ - time_update (); + /* update rt_now, do magic */ + time_update (EV_A); /* queue pending timers and reschedule them */ - /* absolute timers first */ - timers_reify (atimers, atimercnt, ev_now); - /* relative timers second */ - timers_reify (rtimers, rtimercnt, now); + timers_reify (EV_A); /* relative timers called last */ + periodics_reify (EV_A); /* absolute timers called first */ /* queue idle watchers unless io or timers are pending */ if (!pendingcnt) - queue_events (idles, idlecnt, EV_IDLE); + queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE); - /* queue check and possibly idle watchers */ - queue_events (checks, checkcnt, EV_CHECK); + /* queue check watchers, to be executed first */ + if (checkcnt) + queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK); - call_pending (); + call_pending (EV_A); } - while (!ev_loop_done); + while (activecnt && !loop_done); + + if (loop_done != 2) + loop_done = 0; +} + +void +ev_unloop (EV_P_ int how) +{ + loop_done = how; } /*****************************************************************************/ -static void -wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem) +inline void +wlist_add (WL *head, WL elem) { elem->next = *head; *head = elem; } -static void -wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) +inline void +wlist_del (WL *head, WL elem) { while (*head) { @@ -548,255 +1171,355 @@ wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) } } -static void -ev_start (struct ev_watcher *w, int active) +inline void +ev_clear_pending (EV_P_ W w) { - w->pending = 0; - w->active = active; + if (w->pending) + { + pendings [ABSPRI (w)][w->pending - 1].w = 0; + w->pending = 0; + } } -static void -ev_stop (struct ev_watcher *w) +inline void +ev_start (EV_P_ W w, int active) { - if (w->pending) - pendings [w->pending - 1].w = 0; + if (w->priority < EV_MINPRI) w->priority = EV_MINPRI; + if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI; + w->active = active; + ev_ref (EV_A); +} + +inline void +ev_stop (EV_P_ W w) +{ + ev_unref (EV_A); w->active = 0; - /* nop */ } /*****************************************************************************/ void -evio_start (struct ev_io *w) +ev_io_start (EV_P_ struct ev_io *w) { + int fd = w->fd; + if (ev_is_active (w)) return; - int fd = w->fd; + assert (("ev_io_start called with negative fd", fd >= 0)); - ev_start ((struct ev_watcher *)w, 1); - array_needsize (anfds, anfdmax, fd + 1, anfds_init); - wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w); + ev_start (EV_A_ (W)w, 1); + array_needsize (ANFD, 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 (EV_A_ fd); } void -evio_stop (struct ev_io *w) +ev_io_stop (EV_P_ struct ev_io *w) { + ev_clear_pending (EV_A_ (W)w); if (!ev_is_active (w)) return; - wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w); - ev_stop ((struct ev_watcher *)w); + wlist_del ((WL *)&anfds[w->fd].head, (WL)w); + ev_stop (EV_A_ (W)w); - ++fdchangecnt; - array_needsize (fdchanges, fdchangemax, fdchangecnt, ); - fdchanges [fdchangecnt - 1] = w->fd; + fd_change (EV_A_ w->fd); } void -evtimer_start (struct ev_timer *w) +ev_timer_start (EV_P_ struct ev_timer *w) { if (ev_is_active (w)) return; - if (w->is_abs) - { - /* this formula differs from the one in timer_reify becuse we do not round up */ - if (w->repeat) - w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat; + ((WT)w)->at += mn_now; - ev_start ((struct ev_watcher *)w, ++atimercnt); - array_needsize (atimers, atimermax, atimercnt, ); - atimers [atimercnt - 1] = w; - upheap (atimers, atimercnt - 1); - } - else - { - w->at += now; + assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.)); - ev_start ((struct ev_watcher *)w, ++rtimercnt); - array_needsize (rtimers, rtimermax, rtimercnt, ); - rtimers [rtimercnt - 1] = w; - upheap (rtimers, rtimercnt - 1); - } + ev_start (EV_A_ (W)w, ++timercnt); + array_needsize (struct ev_timer *, timers, timermax, timercnt, (void)); + timers [timercnt - 1] = w; + upheap ((WT *)timers, timercnt - 1); + assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w)); } void -evtimer_stop (struct ev_timer *w) +ev_timer_stop (EV_P_ struct ev_timer *w) { + ev_clear_pending (EV_A_ (W)w); if (!ev_is_active (w)) return; - if (w->is_abs) + assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w)); + + if (((W)w)->active < timercnt--) { - if (w->active < atimercnt--) - { - atimers [w->active - 1] = atimers [atimercnt]; - downheap (atimers, atimercnt, w->active - 1); - } + timers [((W)w)->active - 1] = timers [timercnt]; + downheap ((WT *)timers, timercnt, ((W)w)->active - 1); } - else + + ((WT)w)->at = w->repeat; + + ev_stop (EV_A_ (W)w); +} + +void +ev_timer_again (EV_P_ struct ev_timer *w) +{ + if (ev_is_active (w)) { - if (w->active < rtimercnt--) + if (w->repeat) { - rtimers [w->active - 1] = rtimers [rtimercnt]; - downheap (rtimers, rtimercnt, w->active - 1); + ((WT)w)->at = mn_now + w->repeat; + downheap ((WT *)timers, timercnt, ((W)w)->active - 1); } + else + ev_timer_stop (EV_A_ w); } - - ev_stop ((struct ev_watcher *)w); + else if (w->repeat) + ev_timer_start (EV_A_ w); } void -evsignal_start (struct ev_signal *w) +ev_periodic_start (EV_P_ struct ev_periodic *w) { if (ev_is_active (w)) return; - ev_start ((struct ev_watcher *)w, 1); - array_needsize (signals, signalmax, w->signum, signals_init); - wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w); + assert (("ev_periodic_start called with negative interval value", w->interval >= 0.)); - if (!w->next) - { - struct sigaction sa; - sa.sa_handler = sighandler; - sigfillset (&sa.sa_mask); - sa.sa_flags = 0; - sigaction (w->signum, &sa, 0); - } + /* this formula differs from the one in periodic_reify because we do not always round up */ + if (w->interval) + ((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval; + + ev_start (EV_A_ (W)w, ++periodiccnt); + array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void)); + periodics [periodiccnt - 1] = w; + upheap ((WT *)periodics, periodiccnt - 1); + + assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w)); } void -evsignal_stop (struct ev_signal *w) +ev_periodic_stop (EV_P_ struct ev_periodic *w) { + ev_clear_pending (EV_A_ (W)w); if (!ev_is_active (w)) return; - wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w); - ev_stop ((struct ev_watcher *)w); + assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w)); - if (!signals [w->signum - 1].head) - signal (w->signum, SIG_DFL); + if (((W)w)->active < periodiccnt--) + { + periodics [((W)w)->active - 1] = periodics [periodiccnt]; + downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1); + } + + ev_stop (EV_A_ (W)w); } -void evidle_start (struct ev_idle *w) +void +ev_idle_start (EV_P_ struct ev_idle *w) { if (ev_is_active (w)) return; - ev_start ((struct ev_watcher *)w, ++idlecnt); - array_needsize (idles, idlemax, idlecnt, ); + ev_start (EV_A_ (W)w, ++idlecnt); + array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void)); idles [idlecnt - 1] = w; } -void evidle_stop (struct ev_idle *w) +void +ev_idle_stop (EV_P_ struct ev_idle *w) { - idles [w->active - 1] = idles [--idlecnt]; - ev_stop ((struct ev_watcher *)w); + ev_clear_pending (EV_A_ (W)w); + if (ev_is_active (w)) + return; + + idles [((W)w)->active - 1] = idles [--idlecnt]; + ev_stop (EV_A_ (W)w); } -void evcheck_start (struct ev_check *w) +void +ev_prepare_start (EV_P_ struct ev_prepare *w) { if (ev_is_active (w)) return; - ev_start ((struct ev_watcher *)w, ++checkcnt); - array_needsize (checks, checkmax, checkcnt, ); - checks [checkcnt - 1] = w; + ev_start (EV_A_ (W)w, ++preparecnt); + array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void)); + prepares [preparecnt - 1] = w; } -void evcheck_stop (struct ev_check *w) +void +ev_prepare_stop (EV_P_ struct ev_prepare *w) { - checks [w->active - 1] = checks [--checkcnt]; - ev_stop ((struct ev_watcher *)w); -} + ev_clear_pending (EV_A_ (W)w); + if (ev_is_active (w)) + return; -/*****************************************************************************/ -#if 1 + prepares [((W)w)->active - 1] = prepares [--preparecnt]; + ev_stop (EV_A_ (W)w); +} -static void -sin_cb (struct ev_io *w, int revents) +void +ev_check_start (EV_P_ struct ev_check *w) { - fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); + if (ev_is_active (w)) + return; + + ev_start (EV_A_ (W)w, ++checkcnt); + array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void)); + checks [checkcnt - 1] = w; } -static void -ocb (struct ev_timer *w, int revents) +void +ev_check_stop (EV_P_ struct ev_check *w) { - //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_clear_pending (EV_A_ (W)w); + if (ev_is_active (w)) + return; + + checks [((W)w)->active - 1] = checks [--checkcnt]; + ev_stop (EV_A_ (W)w); } -static void -scb (struct ev_signal *w, int revents) +#ifndef SA_RESTART +# define SA_RESTART 0 +#endif + +void +ev_signal_start (EV_P_ struct ev_signal *w) { - fprintf (stderr, "signal %x,%d\n", revents, w->signum); +#if EV_MULTIPLICITY + assert (("signal watchers are only supported in the default loop", loop == default_loop)); +#endif + if (ev_is_active (w)) + return; + + assert (("ev_signal_start called with illegal signal number", w->signum > 0)); + + ev_start (EV_A_ (W)w, 1); + array_needsize (ANSIG, signals, signalmax, w->signum, signals_init); + wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); + + if (!((WL)w)->next) + { +#if WIN32 + signal (w->signum, sighandler); +#else + struct sigaction sa; + sa.sa_handler = sighandler; + sigfillset (&sa.sa_mask); + sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */ + sigaction (w->signum, &sa, 0); +#endif + } } -static void -gcb (struct ev_signal *w, int revents) +void +ev_signal_stop (EV_P_ struct ev_signal *w) { - fprintf (stderr, "generic %x\n", revents); + ev_clear_pending (EV_A_ (W)w); + if (!ev_is_active (w)) + return; + + wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w); + ev_stop (EV_A_ (W)w); + + if (!signals [w->signum - 1].head) + signal (w->signum, SIG_DFL); } -int main (void) +void +ev_child_start (EV_P_ struct ev_child *w) { - struct ev_io sin; +#if EV_MULTIPLICITY + assert (("child watchers are only supported in the default loop", loop == default_loop)); +#endif + if (ev_is_active (w)) + return; - ev_init (0); + ev_start (EV_A_ (W)w, 1); + wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w); +} - evw_init (&sin, sin_cb, 55); - evio_set (&sin, 0, EV_READ); - evio_start (&sin); +void +ev_child_stop (EV_P_ struct ev_child *w) +{ + ev_clear_pending (EV_A_ (W)w); + if (ev_is_active (w)) + return; - struct ev_timer t[10000]; + wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w); + ev_stop (EV_A_ (W)w); +} -#if 0 - int i; - for (i = 0; i < 10000; ++i) - { - struct ev_timer *w = t + i; - evw_init (w, ocb, i); - evtimer_set_abs (w, drand48 (), 0.99775533); - evtimer_start (w); - if (drand48 () < 0.5) - evtimer_stop (w); - } -#endif +/*****************************************************************************/ - struct ev_timer t1; - evw_init (&t1, ocb, 0); - evtimer_set_abs (&t1, 5, 10); - evtimer_start (&t1); +struct ev_once +{ + struct ev_io io; + struct ev_timer to; + void (*cb)(int revents, void *arg); + void *arg; +}; - struct ev_signal sig; - evw_init (&sig, scb, 65535); - evsignal_set (&sig, SIGQUIT); - evsignal_start (&sig); +static void +once_cb (EV_P_ struct ev_once *once, int revents) +{ + void (*cb)(int revents, void *arg) = once->cb; + void *arg = once->arg; - struct ev_check cw; - evw_init (&cw, gcb, 0); - evcheck_start (&cw); + ev_io_stop (EV_A_ &once->io); + ev_timer_stop (EV_A_ &once->to); + ev_free (once); - struct ev_idle iw; - evw_init (&iw, gcb, 0); - evidle_start (&iw); + cb (revents, arg); +} - ev_loop (0); +static void +once_cb_io (EV_P_ struct ev_io *w, int revents) +{ + once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); +} - return 0; +static void +once_cb_to (EV_P_ struct ev_timer *w, int revents) +{ + once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); } -#endif +void +ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) +{ + struct ev_once *once = (struct ev_once *)ev_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 (EV_A_ &once->io); + } + ev_watcher_init (&once->to, once_cb_to); + if (timeout >= 0.) + { + ev_timer_set (&once->to, timeout, 0.); + ev_timer_start (EV_A_ &once->to); + } + } +}