X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/a29fb691be0c199fb643de22a7969a410c3b1e31..d0d4f6a5ab9ce9be2753919a7fe70983f8c48725:/ev.c diff --git a/ev.c b/ev.c index 67d0368..5df23b6 100644 --- a/ev.c +++ b/ev.c @@ -1,5 +1,8 @@ #include #include +#include +#include +#include #include @@ -8,13 +11,23 @@ #include #include -#ifdef CLOCK_MONOTONIC -# define HAVE_MONOTONIC 1 +#ifndef HAVE_MONOTONIC +# ifdef CLOCK_MONOTONIC +# define HAVE_MONOTONIC 1 +# endif #endif -#define HAVE_EPOLL 1 -#define HAVE_REALTIME 1 -#define HAVE_SELECT 0 +#ifndef HAVE_SELECT +# define HAVE_SELECT 1 +#endif + +#ifndef HAVE_EPOLL +# define HAVE_EPOLL 0 +#endif + +#ifndef HAVE_REALTIME +# define HAVE_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. @@ -29,6 +42,9 @@ struct ev_watcher_list { EV_WATCHER_LIST (ev_watcher_list); }; +typedef struct ev_watcher *W; +typedef struct ev_watcher_list *WL; + static ev_tstamp now, diff; /* monotonic clock */ ev_tstamp ev_now; int ev_method; @@ -36,9 +52,11 @@ int ev_method; static int have_monotonic; /* runtime */ static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ -static void (*method_reify)(void); +static void (*method_modify)(int fd, int oev, int nev); static void (*method_poll)(ev_tstamp timeout); +/*****************************************************************************/ + ev_tstamp ev_time (void) { @@ -78,6 +96,8 @@ get_clock (void) cur = newcnt; \ } +/*****************************************************************************/ + typedef struct { struct ev_io *head; @@ -103,7 +123,7 @@ anfds_init (ANFD *base, int count) typedef struct { - struct ev_watcher *w; + W w; int events; } ANPENDING; @@ -111,7 +131,7 @@ static ANPENDING *pendings; static int pendingmax, pendingcnt; static void -event (struct ev_watcher *w, int events) +event (W w, int events) { w->pending = ++pendingcnt; array_needsize (pendings, pendingmax, pendingcnt, ); @@ -130,10 +150,21 @@ fd_event (int fd, int events) int ev = w->events & events; if (ev) - event ((struct ev_watcher *)w, ev); + event ((W)w, ev); } } +static void +queue_events (W *events, int eventcnt, int type) +{ + int i; + + for (i = 0; i < eventcnt; ++i) + event (events [i], type); +} + +/*****************************************************************************/ + static struct ev_timer **atimers; static int atimermax, atimercnt; @@ -181,16 +212,87 @@ downheap (struct ev_timer **timers, int N, int k) timers [k]->active = k + 1; } -static struct ev_signal **signals; +/*****************************************************************************/ + +typedef struct +{ + struct ev_signal *head; + sig_atomic_t gotsig; +} ANSIG; + +static ANSIG *signals; static int signalmax; +static int sigpipe [2]; +static sig_atomic_t gotsig; +static struct ev_io sigev; + static void -signals_init (struct ev_signal **base, int count) +signals_init (ANSIG *base, int count) { while (count--) - *base++ = 0; + { + base->head = 0; + base->gotsig = 0; + ++base; + } } +static void +sighandler (int signum) +{ + signals [signum - 1].gotsig = 1; + + if (!gotsig) + { + gotsig = 1; + write (sigpipe [1], &gotsig, 1); + } +} + +static void +sigcb (struct ev_io *iow, int revents) +{ + struct ev_signal *w; + int sig; + + gotsig = 0; + read (sigpipe [0], &revents, 1); + + for (sig = signalmax; sig--; ) + if (signals [sig].gotsig) + { + signals [sig].gotsig = 0; + + for (w = signals [sig].head; w; w = w->next) + event ((W)w, EV_SIGNAL); + } +} + +static void +siginit (void) +{ + 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); + + evio_set (&sigev, sigpipe [0], EV_READ); + evio_start (&sigev); +} + +/*****************************************************************************/ + +static struct ev_idle **idles; +static int idlemax, idlecnt; + +static struct ev_check **checks; +static int checkmax, checkcnt; + +/*****************************************************************************/ + #if HAVE_EPOLL # include "ev_epoll.c" #endif @@ -212,32 +314,78 @@ int ev_init (int flags) now = get_clock (); diff = ev_now - now; + if (pipe (sigpipe)) + return 0; + + ev_method = EVMETHOD_NONE; #if HAVE_EPOLL - if (epoll_init (flags)) - return ev_method; + if (ev_method == EVMETHOD_NONE) epoll_init (flags); #endif #if HAVE_SELECT - if (select_init (flags)) - return ev_method; + if (ev_method == EVMETHOD_NONE) select_init (flags); #endif - ev_method = EVMETHOD_NONE; + if (ev_method) + { + evw_init (&sigev, sigcb, 0); + siginit (); + } + return ev_method; } +/*****************************************************************************/ + void ev_prefork (void) { + /* nop */ } void ev_postfork_parent (void) { + /* nop */ } void ev_postfork_child (void) { #if HAVE_EPOLL - epoll_postfork_child (); + if (ev_method == EVMETHOD_EPOLL) + epoll_postfork_child (); #endif + + evio_stop (&sigev); + close (sigpipe [0]); + close (sigpipe [1]); + pipe (sigpipe); + siginit (); +} + +/*****************************************************************************/ + +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 @@ -284,7 +432,7 @@ timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) --timercnt; /* maybe pass by reference instead? */ } - event ((struct ev_watcher *)w, EV_TIMEOUT); + event ((W)w, EV_TIMEOUT); } } @@ -335,13 +483,19 @@ void ev_loop (int flags) double block; ev_loop_done = flags & EVLOOP_ONESHOT; + if (checkcnt) + { + queue_events ((W *)checks, checkcnt, EV_CHECK); + call_pending (); + } + do { /* update fd-related kernel structures */ - method_reify (); fdchangecnt = 0; + fd_reify (); /* calculate blocking time */ - if (flags & EVLOOP_NONBLOCK) + if (flags & EVLOOP_NONBLOCK || idlecnt) block = 0.; else { @@ -367,26 +521,35 @@ void ev_loop (int flags) /* update ev_now, do magic */ time_update (); - /* put pending timers into pendign queue and reschedule them */ + /* queue pending timers and reschedule them */ /* absolute timers first */ timers_reify (atimers, atimercnt, ev_now); /* relative timers second */ timers_reify (rtimers, rtimercnt, now); + /* 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); + call_pending (); } while (!ev_loop_done); } +/*****************************************************************************/ + static void -wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem) +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) +wlist_del (WL *head, WL elem) { while (*head) { @@ -401,22 +564,23 @@ wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) } static void -ev_start (struct ev_watcher *w, int active) +ev_start (W w, int active) { w->pending = 0; w->active = active; } static void -ev_stop (struct ev_watcher *w) +ev_stop (W w) { if (w->pending) pendings [w->pending - 1].w = 0; w->active = 0; - /* nop */ } +/*****************************************************************************/ + void evio_start (struct ev_io *w) { @@ -425,9 +589,9 @@ evio_start (struct ev_io *w) int fd = w->fd; - ev_start ((struct ev_watcher *)w, 1); + ev_start ((W)w, 1); array_needsize (anfds, anfdmax, fd + 1, anfds_init); - wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w); + wlist_add ((WL *)&anfds[fd].head, (WL)w); ++fdchangecnt; array_needsize (fdchanges, fdchangemax, fdchangecnt, ); @@ -440,8 +604,8 @@ evio_stop (struct ev_io *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 ((W)w); ++fdchangecnt; array_needsize (fdchanges, fdchangemax, fdchangecnt, ); @@ -460,7 +624,7 @@ evtimer_start (struct ev_timer *w) if (w->repeat) w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat; - ev_start ((struct ev_watcher *)w, ++atimercnt); + ev_start ((W)w, ++atimercnt); array_needsize (atimers, atimermax, atimercnt, ); atimers [atimercnt - 1] = w; upheap (atimers, atimercnt - 1); @@ -469,7 +633,7 @@ evtimer_start (struct ev_timer *w) { w->at += now; - ev_start ((struct ev_watcher *)w, ++rtimercnt); + ev_start ((W)w, ++rtimercnt); array_needsize (rtimers, rtimermax, rtimercnt, ); rtimers [rtimercnt - 1] = w; upheap (rtimers, rtimercnt - 1); @@ -500,7 +664,7 @@ evtimer_stop (struct ev_timer *w) } } - ev_stop ((struct ev_watcher *)w); + ev_stop ((W)w); } void @@ -509,9 +673,18 @@ evsignal_start (struct ev_signal *w) if (ev_is_active (w)) return; - ev_start ((struct ev_watcher *)w, 1); + ev_start ((W)w, 1); array_needsize (signals, signalmax, w->signum, signals_init); - wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w); + wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); + + if (!w->next) + { + struct sigaction sa; + sa.sa_handler = sighandler; + sigfillset (&sa.sa_mask); + sa.sa_flags = 0; + sigaction (w->signum, &sa, 0); + } } void @@ -520,12 +693,48 @@ evsignal_stop (struct ev_signal *w) if (!ev_is_active (w)) return; - wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w); - ev_stop ((struct ev_watcher *)w); + wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w); + ev_stop ((W)w); + + if (!signals [w->signum - 1].head) + signal (w->signum, SIG_DFL); +} + +void evidle_start (struct ev_idle *w) +{ + if (ev_is_active (w)) + return; + + ev_start ((W)w, ++idlecnt); + array_needsize (idles, idlemax, idlecnt, ); + idles [idlecnt - 1] = w; +} + +void evidle_stop (struct ev_idle *w) +{ + idles [w->active - 1] = idles [--idlecnt]; + ev_stop ((W)w); +} + +void evcheck_start (struct ev_check *w) +{ + if (ev_is_active (w)) + return; + + ev_start ((W)w, ++checkcnt); + array_needsize (checks, checkmax, checkcnt, ); + checks [checkcnt - 1] = w; +} + +void evcheck_stop (struct ev_check *w) +{ + checks [w->active - 1] = checks [--checkcnt]; + ev_stop ((W)w); } /*****************************************************************************/ -#if 1 + +#if 0 static void sin_cb (struct ev_io *w, int revents) @@ -541,6 +750,18 @@ ocb (struct ev_timer *w, int revents) evtimer_start (w); } +static void +scb (struct ev_signal *w, int revents) +{ + fprintf (stderr, "signal %x,%d\n", revents, w->signum); +} + +static void +gcb (struct ev_signal *w, int revents) +{ + fprintf (stderr, "generic %x\n", revents); +} + int main (void) { struct ev_io sin; @@ -553,7 +774,7 @@ int main (void) struct ev_timer t[10000]; -#if 1 +#if 0 int i; for (i = 0; i < 10000; ++i) { @@ -571,6 +792,19 @@ int main (void) evtimer_set_abs (&t1, 5, 10); evtimer_start (&t1); + struct ev_signal sig; + evw_init (&sig, scb, 65535); + evsignal_set (&sig, SIGQUIT); + evsignal_start (&sig); + + struct ev_check cw; + evw_init (&cw, gcb, 0); + evcheck_start (&cw); + + struct ev_idle iw; + evw_init (&iw, gcb, 0); + evidle_start (&iw); + ev_loop (0); return 0;