X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/e24bed5d59f88b90093005921b5338267ed65ea2..c20764a666b81af46b955c75eef0f6b088c821b0:/ev.c diff --git a/ev.c b/ev.c index 255bb84..20ad7e4 100644 --- a/ev.c +++ b/ev.c @@ -56,9 +56,7 @@ #include #include -#include #include -#include #include #include @@ -66,12 +64,15 @@ #include #include #include +#include + +#include + #ifndef WIN32 +# include +# include # include #endif -#include -#include - /**/ #ifndef EV_USE_MONOTONIC @@ -96,7 +97,9 @@ #ifndef EV_USE_WIN32 # ifdef WIN32 -# define EV_USE_WIN32 1 +# 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 @@ -125,7 +128,11 @@ #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" +#ifdef EV_H +# include EV_H +#else +# include "ev.h" +#endif #if __GNUC__ >= 3 # define expect(expr,value) __builtin_expect ((expr),(value)) @@ -147,11 +154,61 @@ typedef struct ev_watcher_time *WT; 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 { - struct ev_watcher_list *head; + WL head; unsigned char events; unsigned char reify; } ANFD; @@ -164,19 +221,24 @@ typedef struct #if EV_MULTIPLICITY -struct ev_loop -{ -# define VAR(name,decl) decl; -# include "ev_vars.h" -}; -# undef VAR -# include "ev_wrap.h" + struct ev_loop + { + #define VAR(name,decl) decl; + #include "ev_vars.h" + #undef VAR + }; + #include "ev_wrap.h" + + struct ev_loop default_loop_struct; + static struct ev_loop *default_loop; #else -# define VAR(name,decl) static decl; -# include "ev_vars.h" -# undef VAR + #define VAR(name,decl) static decl; + #include "ev_vars.h" + #undef VAR + + static int default_loop; #endif @@ -217,25 +279,38 @@ ev_now (EV_P) return rt_now; } -#define array_roundsize(base,n) ((n) | 4 & ~3) - -#define array_needsize(base,cur,cnt,init) \ - if (expect_false ((cnt) > cur)) \ - { \ - int newcnt = cur; \ - do \ - { \ - newcnt = array_roundsize (base, newcnt << 1); \ - } \ - while ((cnt) > newcnt); \ - \ - base = realloc (base, sizeof (*base) * (newcnt)); \ - init (base + cur, newcnt - cur); \ - cur = newcnt; \ +#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*/\ } +/* 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; + #define array_free(stem, idx) \ - free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; + ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; /*****************************************************************************/ @@ -252,19 +327,21 @@ anfds_init (ANFD *base, int count) } } -static void -event (EV_P_ W w, int events) +void +ev_feed_event (EV_P_ void *w, int revents) { - if (w->pending) + W w_ = (W)w; + + if (w_->pending) { - pendings [ABSPRI (w)][w->pending - 1].events |= events; + pendings [ABSPRI (w_)][w_->pending - 1].events |= revents; return; } - w->pending = ++pendingcnt [ABSPRI (w)]; - array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], ); - pendings [ABSPRI (w)][w->pending - 1].w = w; - pendings [ABSPRI (w)][w->pending - 1].events = events; + 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 = revents; } static void @@ -273,24 +350,30 @@ queue_events (EV_P_ W *events, int eventcnt, int type) int i; for (i = 0; i < eventcnt; ++i) - event (EV_A_ events [i], type); + ev_feed_event (EV_A_ events [i], type); } -static void -fd_event (EV_P_ int fd, int events) +inline void +fd_event (EV_P_ int fd, int revents) { ANFD *anfd = anfds + fd; struct ev_io *w; for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next) { - int ev = w->events & events; + int ev = w->events & revents; if (ev) - event (EV_A_ (W)w, ev); + ev_feed_event (EV_A_ (W)w, ev); } } +void +ev_feed_fd_event (EV_P_ int fd, int revents) +{ + fd_event (EV_A_ fd, revents); +} + /*****************************************************************************/ static void @@ -321,13 +404,13 @@ fd_reify (EV_P) static void fd_change (EV_P_ int fd) { - if (anfds [fd].reify || fdchangecnt < 0) + if (anfds [fd].reify) return; anfds [fd].reify = 1; ++fdchangecnt; - array_needsize (fdchanges, fdchangemax, fdchangecnt, ); + array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void)); fdchanges [fdchangecnt - 1] = fd; } @@ -339,10 +422,20 @@ fd_kill (EV_P_ int fd) 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); + ev_feed_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 +} + /* called on EBADF to verify fds */ static void fd_ebadf (EV_P) @@ -351,7 +444,7 @@ fd_ebadf (EV_P) for (fd = 0; fd < anfdmax; ++fd) if (anfds [fd].events) - if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) + if (!fd_valid (fd) == -1 && errno == EBADF) fd_kill (EV_A_ fd); } @@ -364,13 +457,12 @@ fd_enomem (EV_P) for (fd = anfdmax; fd--; ) if (anfds [fd].events) { - close (fd); fd_kill (EV_A_ fd); return; } } -/* susually called after fork if method needs to re-arm all fds from scratch */ +/* usually called after fork if method needs to re-arm all fds from scratch */ static void fd_rearm_all (EV_P) { @@ -432,7 +524,7 @@ downheap (WT *heap, int N, int k) typedef struct { - struct ev_watcher_list *head; + WL head; sig_atomic_t volatile gotsig; } ANSIG; @@ -458,34 +550,60 @@ 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; +#ifdef WIN32 + send (sigpipe [1], &signum, 1, MSG_DONTWAIT); +#else write (sigpipe [1], &signum, 1); +#endif errno = old_errno; } } +void +ev_feed_signal_event (EV_P_ int signum) +{ + WL w; + +#if EV_MULTIPLICITY + assert (("feeding signal events is only supported in the default loop", loop == default_loop)); +#endif + + --signum; + + if (signum < 0 || signum >= signalmax) + return; + + signals [signum].gotsig = 0; + + for (w = signals [signum].head; w; w = w->next) + ev_feed_event (EV_A_ (W)w, EV_SIGNAL); +} + static void sigcb (EV_P_ struct ev_io *iow, int revents) { - struct ev_watcher_list *w; int signum; +#ifdef WIN32 + recv (sigpipe [0], &revents, 1, MSG_DONTWAIT); +#else read (sigpipe [0], &revents, 1); +#endif gotsig = 0; for (signum = signalmax; signum--; ) if (signals [signum].gotsig) - { - signals [signum].gotsig = 0; - - for (w = signals [signum].head; w; w = w->next) - event (EV_A_ (W)w, EV_SIGNAL); - } + ev_feed_signal_event (EV_A_ signum + 1); } static void @@ -507,9 +625,10 @@ siginit (EV_P) /*****************************************************************************/ +static struct ev_child *childs [PID_HASHSIZE]; + #ifndef WIN32 -static struct ev_child *childs [PID_HASHSIZE]; static struct ev_signal childev; #ifndef WCONTINUED @@ -527,7 +646,7 @@ child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status) ev_priority (w) = ev_priority (sw); /* need to do it *now* */ w->rpid = pid; w->rstatus = status; - event (EV_A_ (W)w, EV_CHILD); + ev_feed_event (EV_A_ (W)w, EV_CHILD); } } @@ -539,7 +658,7 @@ childcb (EV_P_ struct ev_signal *sw, int revents) 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); + ev_feed_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 */ @@ -633,6 +752,9 @@ loop_init (EV_P_ int methods) #if EV_USE_SELECT if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods); #endif + + ev_watcher_init (&sigev, sigcb); + ev_set_priority (&sigev, EV_MAXPRI); } } @@ -660,34 +782,52 @@ loop_destroy (EV_P) for (i = NUMPRI; i--; ) array_free (pending, [i]); - array_free (fdchange, ); - array_free (timer, ); - array_free (periodic, ); - array_free (idle, ); - array_free (prepare, ); - array_free (check, ); + /* 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; - /*TODO*/ } -void +static void loop_fork (EV_P) { - /*TODO*/ #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; } #if EV_MULTIPLICITY struct ev_loop * ev_loop_new (int methods) { - struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop)); + 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); @@ -701,25 +841,20 @@ void ev_loop_destroy (EV_P) { loop_destroy (EV_A); - free (loop); + ev_free (loop); } void ev_loop_fork (EV_P) { - loop_fork (EV_A); + postfork = 1; } #endif #if EV_MULTIPLICITY -struct ev_loop default_loop_struct; -static struct ev_loop *default_loop; - struct ev_loop * #else -static int default_loop; - int #endif ev_default_loop (int methods) @@ -740,8 +875,6 @@ ev_default_loop (int methods) if (ev_method (EV_A)) { - ev_watcher_init (&sigev, sigcb); - ev_set_priority (&sigev, EV_MAXPRI); siginit (EV_A); #ifndef WIN32 @@ -765,8 +898,10 @@ ev_default_destroy (void) struct ev_loop *loop = default_loop; #endif +#ifndef WIN32 ev_ref (EV_A); /* child watcher */ ev_signal_stop (EV_A_ &childev); +#endif ev_ref (EV_A); /* signal watcher */ ev_io_stop (EV_A_ &sigev); @@ -784,19 +919,24 @@ ev_default_fork (void) struct ev_loop *loop = default_loop; #endif - loop_fork (EV_A); - - ev_io_stop (EV_A_ &sigev); - close (sigpipe [0]); - close (sigpipe [1]); - pipe (sigpipe); - - ev_ref (EV_A); /* signal watcher */ - siginit (EV_A); + if (method) + postfork = 1; } /*****************************************************************************/ +static int +any_pending (EV_P) +{ + int pri; + + for (pri = NUMPRI; pri--; ) + if (pendingcnt [pri]) + return 1; + + return 0; +} + static void call_pending (EV_P) { @@ -834,7 +974,7 @@ timers_reify (EV_P) else ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */ - event (EV_A_ (W)w, EV_TIMEOUT); + ev_feed_event (EV_A_ (W)w, EV_TIMEOUT); } } @@ -848,7 +988,14 @@ periodics_reify (EV_P) assert (("inactive timer on periodic heap detected", ev_is_active (w))); /* first reschedule or stop timer */ - if (w->interval) + if (w->reschedule_cb) + { + ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001); + + assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now)); + downheap ((WT *)periodics, periodiccnt, 0); + } + else if (w->interval) { ((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)); @@ -857,7 +1004,7 @@ periodics_reify (EV_P) else ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */ - event (EV_A_ (W)w, EV_PERIODIC); + ev_feed_event (EV_A_ (W)w, EV_PERIODIC); } } @@ -871,19 +1018,15 @@ periodics_reschedule (EV_P) { struct ev_periodic *w = periodics [i]; - if (w->interval) - { - ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval; - - if (fabs (diff) >= 1e-4) - { - ev_periodic_stop (EV_A_ w); - ev_periodic_start (EV_A_ w); - - i = 0; /* restart loop, inefficient, but time jumps should be rare */ - } - } + if (w->reschedule_cb) + ((WT)w)->at = w->reschedule_cb (w, rt_now); + else if (w->interval) + ((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval; } + + /* now rebuild the heap */ + for (i = periodiccnt >> 1; i--; ) + downheap ((WT *)periodics, periodiccnt, i); } inline int @@ -980,12 +1123,16 @@ ev_loop (EV_P_ int flags) 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 (EV_A); /* calculate blocking time */ - /* we only need this for !monotonic clockor timers, but as we basically + /* we only need this for !monotonic clock or timers, but as we basically always have timers, we just calculate it always */ #if EV_USE_MONOTONIC if (expect_true (have_monotonic)) @@ -1028,7 +1175,7 @@ ev_loop (EV_P_ int flags) periodics_reify (EV_A); /* absolute timers called first */ /* queue idle watchers unless io or timers are pending */ - if (!pendingcnt) + if (idlecnt && !any_pending (EV_A)) queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE); /* queue check watchers, to be executed first */ @@ -1113,7 +1260,7 @@ ev_io_start (EV_P_ struct ev_io *w) assert (("ev_io_start called with negative fd", fd >= 0)); ev_start (EV_A_ (W)w, 1); - array_needsize (anfds, anfdmax, fd + 1, anfds_init); + array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init); wlist_add ((WL *)&anfds[fd].head, (WL)w); fd_change (EV_A_ fd); @@ -1143,7 +1290,7 @@ ev_timer_start (EV_P_ struct ev_timer *w) assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.)); ev_start (EV_A_ (W)w, ++timercnt); - array_needsize (timers, timermax, timercnt, ); + array_needsize (struct ev_timer *, timers, timermax, timercnt, (void)); timers [timercnt - 1] = w; upheap ((WT *)timers, timercnt - 1); @@ -1193,14 +1340,17 @@ ev_periodic_start (EV_P_ struct ev_periodic *w) if (ev_is_active (w)) return; - 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) - ((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval; + if (w->reschedule_cb) + ((WT)w)->at = w->reschedule_cb (w, rt_now); + else if (w->interval) + { + 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 */ + ((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval; + } ev_start (EV_A_ (W)w, ++periodiccnt); - array_needsize (periodics, periodicmax, periodiccnt, ); + array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void)); periodics [periodiccnt - 1] = w; upheap ((WT *)periodics, periodiccnt - 1); @@ -1225,6 +1375,13 @@ ev_periodic_stop (EV_P_ struct ev_periodic *w) ev_stop (EV_A_ (W)w); } +void +ev_periodic_again (EV_P_ struct ev_periodic *w) +{ + ev_periodic_stop (EV_A_ w); + ev_periodic_start (EV_A_ w); +} + void ev_idle_start (EV_P_ struct ev_idle *w) { @@ -1232,7 +1389,7 @@ ev_idle_start (EV_P_ struct ev_idle *w) return; ev_start (EV_A_ (W)w, ++idlecnt); - array_needsize (idles, idlemax, idlecnt, ); + array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void)); idles [idlecnt - 1] = w; } @@ -1254,7 +1411,7 @@ ev_prepare_start (EV_P_ struct ev_prepare *w) return; ev_start (EV_A_ (W)w, ++preparecnt); - array_needsize (prepares, preparemax, preparecnt, ); + array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void)); prepares [preparecnt - 1] = w; } @@ -1276,7 +1433,7 @@ ev_check_start (EV_P_ struct ev_check *w) return; ev_start (EV_A_ (W)w, ++checkcnt); - array_needsize (checks, checkmax, checkcnt, ); + array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void)); checks [checkcnt - 1] = w; } @@ -1307,16 +1464,20 @@ ev_signal_start (EV_P_ struct ev_signal *w) assert (("ev_signal_start called with illegal signal number", w->signum > 0)); ev_start (EV_A_ (W)w, 1); - array_needsize (signals, signalmax, w->signum, signals_init); + 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 } } @@ -1376,7 +1537,7 @@ once_cb (EV_P_ struct ev_once *once, int revents) ev_io_stop (EV_A_ &once->io); ev_timer_stop (EV_A_ &once->to); - free (once); + ev_free (once); cb (revents, arg); } @@ -1396,7 +1557,7 @@ once_cb_to (EV_P_ struct ev_timer *w, int revents) void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) { - struct ev_once *once = malloc (sizeof (struct ev_once)); + 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);