X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/89c65248d571a6a0ba88e2e0290db2c03f1e992c..34ce8134fec96758f92d4b5a47d151081c6b74d6:/ev.c?ds=sidebyside diff --git a/ev.c b/ev.c index 0ab2670..7995b34 100644 --- a/ev.c +++ b/ev.c @@ -1,4 +1,6 @@ /* + * libev event processing core, watcher management + * * Copyright (c) 2007 Marc Alexander Lehmann * All rights reserved. * @@ -26,6 +28,9 @@ * (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 @@ -43,27 +48,31 @@ #include #include -#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 CLOCK_REALTIME +# define EV_USE_REALTIME 0 +#endif +#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 PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */ +#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detetc time jumps) */ +#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */ +#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */ #include "ev.h" @@ -86,7 +95,7 @@ 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; @@ -100,7 +109,7 @@ ev_time (void) static ev_tstamp get_clock (void) { -#if HAVE_MONOTONIC +#if EV_USE_MONOTONIC if (have_monotonic) { struct timespec ts; @@ -112,13 +121,15 @@ get_clock (void) return ev_time (); } +#define array_roundsize(base,n) ((n) | 4 & ~3) + #define array_needsize(base,cur,cnt,init) \ if ((cnt) > cur) \ { \ int newcnt = cur; \ do \ { \ - newcnt = (newcnt << 1) | 4 & ~3; \ + newcnt = array_roundsize (base, newcnt << 1); \ } \ while ((cnt) > newcnt); \ \ @@ -132,7 +143,8 @@ get_clock (void) typedef struct { struct ev_io *head; - int events; + unsigned char events; + unsigned char reify; } ANFD; static ANFD *anfds; @@ -145,6 +157,8 @@ anfds_init (ANFD *base, int count) { base->head = 0; base->events = EV_NONE; + base->reify = 0; + ++base; } } @@ -161,13 +175,16 @@ static int pendingmax, pendingcnt; static void event (W w, int events) { - if (w->active) + if (w->pending) { - w->pending = ++pendingcnt; - array_needsize (pendings, pendingmax, pendingcnt, ); - pendings [pendingcnt - 1].w = w; - pendings [pendingcnt - 1].events = events; + pendings [w->pending - 1].events |= events; + return; } + + w->pending = ++pendingcnt; + array_needsize (pendings, pendingmax, pendingcnt, ); + pendings [pendingcnt - 1].w = w; + pendings [pendingcnt - 1].events = events; } static void @@ -215,7 +232,7 @@ fd_reify (void) for (w = anfd->head; w; w = w->next) events |= w->events; - anfd->events &= ~EV_REIFY; + anfd->reify = 0; if (anfd->events != events) { @@ -230,10 +247,10 @@ fd_reify (void) static void fd_change (int fd) { - if (anfds [fd].events & EV_REIFY) + if (anfds [fd].reify || fdchangecnt < 0) return; - anfds [fd].events |= EV_REIFY; + anfds [fd].reify = 1; ++fdchangecnt; array_needsize (fdchanges, fdchangemax, fdchangecnt, ); @@ -251,8 +268,8 @@ fd_recheck (void) if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) while (anfds [fd].head) { - event ((W)anfds [fd].head, EV_ERROR); ev_io_stop (anfds [fd].head); + event ((W)anfds [fd].head, EV_ERROR | EV_READ | EV_WRITE); } } @@ -310,14 +327,14 @@ downheap (WT *timers, int N, int k) typedef struct { struct ev_signal *head; - sig_atomic_t gotsig; + 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 @@ -327,6 +344,7 @@ signals_init (ANSIG *base, int count) { base->head = 0; base->gotsig = 0; + ++base; } } @@ -339,7 +357,7 @@ sighandler (int signum) if (!gotsig) { gotsig = 1; - write (sigpipe [1], &gotsig, 1); + write (sigpipe [1], &signum, 1); } } @@ -349,8 +367,8 @@ sigcb (struct ev_io *iow, int revents) struct ev_signal *w; int sig; - gotsig = 0; read (sigpipe [0], &revents, 1); + gotsig = 0; for (sig = signalmax; sig--; ) if (signals [sig].gotsig) @@ -413,10 +431,10 @@ childcb (struct ev_signal *sw, int revents) /*****************************************************************************/ -#if HAVE_EPOLL +#if EV_USE_EPOLL # include "ev_epoll.c" #endif -#if HAVE_SELECT +#if EV_USE_SELECT # include "ev_select.c" #endif @@ -436,7 +454,7 @@ int ev_init (int flags) { if (!ev_method) { -#if HAVE_MONOTONIC +#if EV_USE_MONOTONIC { struct timespec ts; if (!clock_gettime (CLOCK_MONOTONIC, &ts)) @@ -452,10 +470,10 @@ int ev_init (int flags) return 0; ev_method = EVMETHOD_NONE; -#if HAVE_EPOLL +#if EV_USE_EPOLL if (ev_method == EVMETHOD_NONE) epoll_init (flags); #endif -#if HAVE_SELECT +#if EV_USE_SELECT if (ev_method == EVMETHOD_NONE) select_init (flags); #endif @@ -475,21 +493,21 @@ int ev_init (int flags) /*****************************************************************************/ void -ev_prefork (void) +ev_fork_prepare (void) { /* nop */ } void -ev_postfork_parent (void) +ev_fork_parent (void) { /* nop */ } void -ev_postfork_child (void) +ev_fork_child (void) { -#if HAVE_EPOLL +#if EV_USE_EPOLL if (ev_method == EVMETHOD_EPOLL) epoll_postfork_child (); #endif @@ -525,17 +543,17 @@ timers_reify (void) { struct ev_timer *w = timers [0]; - event ((W)w, EV_TIMEOUT); - /* first reschedule or stop timer */ if (w->repeat) { + assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.)); w->at = now + w->repeat; - assert (("timer timeout in the past, negative repeat?", w->at > now)); downheap ((WT *)timers, timercnt, 0); } else ev_timer_stop (w); /* nonrepeating: stop timer */ + + event ((W)w, EV_TIMEOUT); } } @@ -550,13 +568,13 @@ periodics_reify (void) if (w->interval) { w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; - assert (("periodic timeout in the past, negative interval?", w->at > ev_now)); + assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now)); downheap ((WT *)periodics, periodiccnt, 0); } else ev_periodic_stop (w); /* nonrepeating: stop timer */ - event ((W)w, EV_TIMEOUT); + event ((W)w, EV_PERIODIC); } } @@ -721,7 +739,7 @@ wlist_del (WL *head, WL elem) } static void -ev_clear (W w) +ev_clear_pending (W w) { if (w->pending) { @@ -752,6 +770,8 @@ ev_io_start (struct ev_io *w) int fd = w->fd; + assert (("ev_io_start called with negative fd", fd >= 0)); + ev_start ((W)w, 1); array_needsize (anfds, anfdmax, fd + 1, anfds_init); wlist_add ((WL *)&anfds[fd].head, (WL)w); @@ -762,7 +782,7 @@ ev_io_start (struct ev_io *w) void ev_io_stop (struct ev_io *w) { - ev_clear ((W)w); + ev_clear_pending ((W)w); if (!ev_is_active (w)) return; @@ -780,7 +800,7 @@ ev_timer_start (struct ev_timer *w) w->at += now; - assert (("timer repeat value less than zero not allowed", w->repeat >= 0.)); + assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.)); ev_start ((W)w, ++timercnt); array_needsize (timers, timermax, timercnt, ); @@ -791,7 +811,7 @@ ev_timer_start (struct ev_timer *w) void ev_timer_stop (struct ev_timer *w) { - ev_clear ((W)w); + ev_clear_pending ((W)w); if (!ev_is_active (w)) return; @@ -829,7 +849,7 @@ ev_periodic_start (struct ev_periodic *w) if (ev_is_active (w)) return; - assert (("periodic interval value less than zero not allowed", w->interval >= 0.)); + assert (("ev_periodic_start called with negative interval value", w->interval >= 0.)); /* this formula differs from the one in periodic_reify because we do not always round up */ if (w->interval) @@ -844,7 +864,7 @@ ev_periodic_start (struct ev_periodic *w) void ev_periodic_stop (struct ev_periodic *w) { - ev_clear ((W)w); + ev_clear_pending ((W)w); if (!ev_is_active (w)) return; @@ -863,6 +883,8 @@ ev_signal_start (struct ev_signal *w) if (ev_is_active (w)) return; + assert (("ev_signal_start called with illegal signal number", w->signum > 0)); + ev_start ((W)w, 1); array_needsize (signals, signalmax, w->signum, signals_init); wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); @@ -880,7 +902,7 @@ ev_signal_start (struct ev_signal *w) void ev_signal_stop (struct ev_signal *w) { - ev_clear ((W)w); + ev_clear_pending ((W)w); if (!ev_is_active (w)) return; @@ -905,7 +927,7 @@ ev_idle_start (struct ev_idle *w) void ev_idle_stop (struct ev_idle *w) { - ev_clear ((W)w); + ev_clear_pending ((W)w); if (ev_is_active (w)) return; @@ -927,7 +949,7 @@ ev_prepare_start (struct ev_prepare *w) void ev_prepare_stop (struct ev_prepare *w) { - ev_clear ((W)w); + ev_clear_pending ((W)w); if (ev_is_active (w)) return; @@ -949,7 +971,7 @@ ev_check_start (struct ev_check *w) void ev_check_stop (struct ev_check *w) { - ev_clear ((W)w); + ev_clear_pending ((W)w); if (ev_is_active (w)) return; @@ -970,7 +992,7 @@ ev_child_start (struct ev_child *w) void ev_child_stop (struct ev_child *w) { - ev_clear ((W)w); + ev_clear_pending ((W)w); if (ev_is_active (w)) return; @@ -1019,14 +1041,13 @@ ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *ar struct ev_once *once = malloc (sizeof (struct ev_once)); if (!once) - cb (EV_ERROR, arg); + 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); @@ -1034,7 +1055,6 @@ ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *ar } ev_watcher_init (&once->to, once_cb_to); - if (timeout >= 0.) { ev_timer_set (&once->to, timeout, 0.);