| 1 |
/* |
| 2 |
* libev event processing core, watcher management |
| 3 |
* |
| 4 |
* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
| 8 |
* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* * Redistributions in binary form must reproduce the above |
| 15 |
* copyright notice, this list of conditions and the following |
| 16 |
* disclaimer in the documentation and/or other materials provided |
| 17 |
* with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#if EV_USE_CONFIG_H |
| 32 |
# include "config.h" |
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#endif |
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|
| 35 |
#include <math.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
| 38 |
#include <fcntl.h> |
| 39 |
#include <signal.h> |
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#include <stddef.h> |
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|
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#include <stdio.h> |
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|
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#include <assert.h> |
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#include <errno.h> |
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#include <sys/types.h> |
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#ifndef WIN32 |
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# include <sys/wait.h> |
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#endif |
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#include <sys/time.h> |
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#include <time.h> |
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|
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/**/ |
| 54 |
|
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#ifndef EV_USE_MONOTONIC |
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# define EV_USE_MONOTONIC 1 |
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#endif |
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|
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#ifndef EV_USE_SELECT |
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# define EV_USE_SELECT 1 |
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#endif |
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|
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#ifndef EV_USE_POLL |
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# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */ |
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#endif |
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|
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#ifndef EV_USE_EPOLL |
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# define EV_USE_EPOLL 0 |
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#endif |
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|
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#ifndef EV_USE_KQUEUE |
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# define EV_USE_KQUEUE 0 |
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#endif |
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|
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#ifndef EV_USE_REALTIME |
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# define EV_USE_REALTIME 1 |
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#endif |
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|
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/**/ |
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|
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#ifndef CLOCK_MONOTONIC |
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# undef EV_USE_MONOTONIC |
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# define EV_USE_MONOTONIC 0 |
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#endif |
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|
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#ifndef CLOCK_REALTIME |
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# undef EV_USE_REALTIME |
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# define EV_USE_REALTIME 0 |
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#endif |
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|
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/**/ |
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|
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#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ |
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#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */ |
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#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */ |
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/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */ |
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|
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#include "ev.h" |
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|
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#if __GNUC__ >= 3 |
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# define expect(expr,value) __builtin_expect ((expr),(value)) |
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# define inline inline |
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#else |
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# define expect(expr,value) (expr) |
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# define inline static |
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#endif |
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|
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#define expect_false(expr) expect ((expr) != 0, 0) |
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#define expect_true(expr) expect ((expr) != 0, 1) |
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|
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#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1) |
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#define ABSPRI(w) ((w)->priority - EV_MINPRI) |
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|
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typedef struct ev_watcher *W; |
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typedef struct ev_watcher_list *WL; |
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typedef struct ev_watcher_time *WT; |
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|
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static ev_tstamp now_floor, now, diff; /* monotonic clock */ |
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ev_tstamp ev_now; |
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int ev_method; |
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|
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static int have_monotonic; /* runtime */ |
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|
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static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ |
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static void (*method_modify)(int fd, int oev, int nev); |
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static void (*method_poll)(ev_tstamp timeout); |
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|
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/*****************************************************************************/ |
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|
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ev_tstamp |
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ev_time (void) |
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{ |
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#if EV_USE_REALTIME |
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struct timespec ts; |
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clock_gettime (CLOCK_REALTIME, &ts); |
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return ts.tv_sec + ts.tv_nsec * 1e-9; |
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#else |
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struct timeval tv; |
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gettimeofday (&tv, 0); |
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return tv.tv_sec + tv.tv_usec * 1e-6; |
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#endif |
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} |
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|
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static ev_tstamp |
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get_clock (void) |
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{ |
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#if EV_USE_MONOTONIC |
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if (expect_true (have_monotonic)) |
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{ |
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struct timespec ts; |
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clock_gettime (CLOCK_MONOTONIC, &ts); |
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return ts.tv_sec + ts.tv_nsec * 1e-9; |
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} |
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#endif |
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|
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return ev_time (); |
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} |
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|
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#define array_roundsize(base,n) ((n) | 4 & ~3) |
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|
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#define array_needsize(base,cur,cnt,init) \ |
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if (expect_false ((cnt) > cur)) \ |
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{ \ |
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int newcnt = cur; \ |
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do \ |
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{ \ |
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newcnt = array_roundsize (base, newcnt << 1); \ |
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} \ |
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while ((cnt) > newcnt); \ |
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\ |
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base = realloc (base, sizeof (*base) * (newcnt)); \ |
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init (base + cur, newcnt - cur); \ |
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cur = newcnt; \ |
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} |
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|
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/*****************************************************************************/ |
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|
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typedef struct |
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{ |
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struct ev_io *head; |
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unsigned char events; |
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unsigned char reify; |
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} ANFD; |
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|
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static ANFD *anfds; |
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static int anfdmax; |
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|
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static void |
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anfds_init (ANFD *base, int count) |
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{ |
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while (count--) |
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{ |
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base->head = 0; |
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base->events = EV_NONE; |
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base->reify = 0; |
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|
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++base; |
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} |
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} |
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|
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typedef struct |
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{ |
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W w; |
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int events; |
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} ANPENDING; |
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|
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static ANPENDING *pendings [NUMPRI]; |
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static int pendingmax [NUMPRI], pendingcnt [NUMPRI]; |
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|
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static void |
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event (W w, int events) |
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{ |
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if (w->pending) |
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{ |
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pendings [ABSPRI (w)][w->pending - 1].events |= events; |
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return; |
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} |
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|
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w->pending = ++pendingcnt [ABSPRI (w)]; |
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array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], ); |
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pendings [ABSPRI (w)][w->pending - 1].w = w; |
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pendings [ABSPRI (w)][w->pending - 1].events = events; |
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} |
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|
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static void |
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queue_events (W *events, int eventcnt, int type) |
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{ |
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int i; |
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|
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for (i = 0; i < eventcnt; ++i) |
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event (events [i], type); |
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} |
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|
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static void |
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fd_event (int fd, int events) |
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{ |
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ANFD *anfd = anfds + fd; |
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struct ev_io *w; |
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|
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for (w = anfd->head; w; w = w->next) |
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{ |
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int ev = w->events & events; |
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|
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if (ev) |
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event ((W)w, ev); |
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} |
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} |
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|
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/*****************************************************************************/ |
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|
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static int *fdchanges; |
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static int fdchangemax, fdchangecnt; |
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|
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static void |
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fd_reify (void) |
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{ |
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int i; |
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|
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for (i = 0; i < fdchangecnt; ++i) |
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{ |
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int fd = fdchanges [i]; |
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ANFD *anfd = anfds + fd; |
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struct ev_io *w; |
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|
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int events = 0; |
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|
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for (w = anfd->head; w; w = w->next) |
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events |= w->events; |
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|
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anfd->reify = 0; |
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|
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if (anfd->events != events) |
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{ |
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method_modify (fd, anfd->events, events); |
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anfd->events = events; |
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} |
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} |
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|
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fdchangecnt = 0; |
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} |
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|
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static void |
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fd_change (int fd) |
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{ |
| 285 |
if (anfds [fd].reify || fdchangecnt < 0) |
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return; |
| 287 |
|
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anfds [fd].reify = 1; |
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|
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++fdchangecnt; |
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array_needsize (fdchanges, fdchangemax, fdchangecnt, ); |
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fdchanges [fdchangecnt - 1] = fd; |
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} |
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|
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static void |
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fd_kill (int fd) |
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{ |
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struct ev_io *w; |
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|
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printf ("killing fd %d\n", fd);//D |
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while ((w = anfds [fd].head)) |
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{ |
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ev_io_stop (w); |
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event ((W)w, EV_ERROR | EV_READ | EV_WRITE); |
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} |
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} |
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|
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/* called on EBADF to verify fds */ |
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static void |
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fd_ebadf (void) |
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{ |
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int fd; |
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|
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for (fd = 0; fd < anfdmax; ++fd) |
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if (anfds [fd].events) |
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if (fcntl (fd, F_GETFD) == -1 && errno == EBADF) |
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fd_kill (fd); |
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} |
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|
| 320 |
/* called on ENOMEM in select/poll to kill some fds and retry */ |
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static void |
| 322 |
fd_enomem (void) |
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{ |
| 324 |
int fd = anfdmax; |
| 325 |
|
| 326 |
while (fd--) |
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if (anfds [fd].events) |
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{ |
| 329 |
close (fd); |
| 330 |
fd_kill (fd); |
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return; |
| 332 |
} |
| 333 |
} |
| 334 |
|
| 335 |
/*****************************************************************************/ |
| 336 |
|
| 337 |
static struct ev_timer **timers; |
| 338 |
static int timermax, timercnt; |
| 339 |
|
| 340 |
static struct ev_periodic **periodics; |
| 341 |
static int periodicmax, periodiccnt; |
| 342 |
|
| 343 |
static void |
| 344 |
upheap (WT *timers, int k) |
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{ |
| 346 |
WT w = timers [k]; |
| 347 |
|
| 348 |
while (k && timers [k >> 1]->at > w->at) |
| 349 |
{ |
| 350 |
timers [k] = timers [k >> 1]; |
| 351 |
timers [k]->active = k + 1; |
| 352 |
k >>= 1; |
| 353 |
} |
| 354 |
|
| 355 |
timers [k] = w; |
| 356 |
timers [k]->active = k + 1; |
| 357 |
|
| 358 |
} |
| 359 |
|
| 360 |
static void |
| 361 |
downheap (WT *timers, int N, int k) |
| 362 |
{ |
| 363 |
WT w = timers [k]; |
| 364 |
|
| 365 |
while (k < (N >> 1)) |
| 366 |
{ |
| 367 |
int j = k << 1; |
| 368 |
|
| 369 |
if (j + 1 < N && timers [j]->at > timers [j + 1]->at) |
| 370 |
++j; |
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|
| 372 |
if (w->at <= timers [j]->at) |
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break; |
| 374 |
|
| 375 |
timers [k] = timers [j]; |
| 376 |
timers [k]->active = k + 1; |
| 377 |
k = j; |
| 378 |
} |
| 379 |
|
| 380 |
timers [k] = w; |
| 381 |
timers [k]->active = k + 1; |
| 382 |
} |
| 383 |
|
| 384 |
/*****************************************************************************/ |
| 385 |
|
| 386 |
typedef struct |
| 387 |
{ |
| 388 |
struct ev_signal *head; |
| 389 |
sig_atomic_t volatile gotsig; |
| 390 |
} ANSIG; |
| 391 |
|
| 392 |
static ANSIG *signals; |
| 393 |
static int signalmax; |
| 394 |
|
| 395 |
static int sigpipe [2]; |
| 396 |
static sig_atomic_t volatile gotsig; |
| 397 |
static struct ev_io sigev; |
| 398 |
|
| 399 |
static void |
| 400 |
signals_init (ANSIG *base, int count) |
| 401 |
{ |
| 402 |
while (count--) |
| 403 |
{ |
| 404 |
base->head = 0; |
| 405 |
base->gotsig = 0; |
| 406 |
|
| 407 |
++base; |
| 408 |
} |
| 409 |
} |
| 410 |
|
| 411 |
static void |
| 412 |
sighandler (int signum) |
| 413 |
{ |
| 414 |
signals [signum - 1].gotsig = 1; |
| 415 |
|
| 416 |
if (!gotsig) |
| 417 |
{ |
| 418 |
gotsig = 1; |
| 419 |
write (sigpipe [1], &signum, 1); |
| 420 |
} |
| 421 |
} |
| 422 |
|
| 423 |
static void |
| 424 |
sigcb (struct ev_io *iow, int revents) |
| 425 |
{ |
| 426 |
struct ev_signal *w; |
| 427 |
int signum; |
| 428 |
|
| 429 |
read (sigpipe [0], &revents, 1); |
| 430 |
gotsig = 0; |
| 431 |
|
| 432 |
for (signum = signalmax; signum--; ) |
| 433 |
if (signals [signum].gotsig) |
| 434 |
{ |
| 435 |
signals [signum].gotsig = 0; |
| 436 |
|
| 437 |
for (w = signals [signum].head; w; w = w->next) |
| 438 |
event ((W)w, EV_SIGNAL); |
| 439 |
} |
| 440 |
} |
| 441 |
|
| 442 |
static void |
| 443 |
siginit (void) |
| 444 |
{ |
| 445 |
#ifndef WIN32 |
| 446 |
fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC); |
| 447 |
fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC); |
| 448 |
|
| 449 |
/* rather than sort out wether we really need nb, set it */ |
| 450 |
fcntl (sigpipe [0], F_SETFL, O_NONBLOCK); |
| 451 |
fcntl (sigpipe [1], F_SETFL, O_NONBLOCK); |
| 452 |
#endif |
| 453 |
|
| 454 |
ev_io_set (&sigev, sigpipe [0], EV_READ); |
| 455 |
ev_io_start (&sigev); |
| 456 |
} |
| 457 |
|
| 458 |
/*****************************************************************************/ |
| 459 |
|
| 460 |
static struct ev_idle **idles; |
| 461 |
static int idlemax, idlecnt; |
| 462 |
|
| 463 |
static struct ev_prepare **prepares; |
| 464 |
static int preparemax, preparecnt; |
| 465 |
|
| 466 |
static struct ev_check **checks; |
| 467 |
static int checkmax, checkcnt; |
| 468 |
|
| 469 |
/*****************************************************************************/ |
| 470 |
|
| 471 |
static struct ev_child *childs [PID_HASHSIZE]; |
| 472 |
static struct ev_signal childev; |
| 473 |
|
| 474 |
#ifndef WIN32 |
| 475 |
|
| 476 |
#ifndef WCONTINUED |
| 477 |
# define WCONTINUED 0 |
| 478 |
#endif |
| 479 |
|
| 480 |
static void |
| 481 |
childcb (struct ev_signal *sw, int revents) |
| 482 |
{ |
| 483 |
struct ev_child *w; |
| 484 |
int pid, status; |
| 485 |
|
| 486 |
while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1) |
| 487 |
for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next) |
| 488 |
if (w->pid == pid || !w->pid) |
| 489 |
{ |
| 490 |
w->status = status; |
| 491 |
event ((W)w, EV_CHILD); |
| 492 |
} |
| 493 |
} |
| 494 |
|
| 495 |
#endif |
| 496 |
|
| 497 |
/*****************************************************************************/ |
| 498 |
|
| 499 |
#if EV_USE_KQUEUE |
| 500 |
# include "ev_kqueue.c" |
| 501 |
#endif |
| 502 |
#if EV_USE_EPOLL |
| 503 |
# include "ev_epoll.c" |
| 504 |
#endif |
| 505 |
#if EV_USE_POLL |
| 506 |
# include "ev_poll.c" |
| 507 |
#endif |
| 508 |
#if EV_USE_SELECT |
| 509 |
# include "ev_select.c" |
| 510 |
#endif |
| 511 |
|
| 512 |
int |
| 513 |
ev_version_major (void) |
| 514 |
{ |
| 515 |
return EV_VERSION_MAJOR; |
| 516 |
} |
| 517 |
|
| 518 |
int |
| 519 |
ev_version_minor (void) |
| 520 |
{ |
| 521 |
return EV_VERSION_MINOR; |
| 522 |
} |
| 523 |
|
| 524 |
/* return true if we are running with elevated privileges and ignore env variables */ |
| 525 |
static int |
| 526 |
enable_secure () |
| 527 |
{ |
| 528 |
return getuid () != geteuid () |
| 529 |
|| getgid () != getegid (); |
| 530 |
} |
| 531 |
|
| 532 |
int ev_init (int methods) |
| 533 |
{ |
| 534 |
if (!ev_method) |
| 535 |
{ |
| 536 |
#if EV_USE_MONOTONIC |
| 537 |
{ |
| 538 |
struct timespec ts; |
| 539 |
if (!clock_gettime (CLOCK_MONOTONIC, &ts)) |
| 540 |
have_monotonic = 1; |
| 541 |
} |
| 542 |
#endif |
| 543 |
|
| 544 |
ev_now = ev_time (); |
| 545 |
now = get_clock (); |
| 546 |
now_floor = now; |
| 547 |
diff = ev_now - now; |
| 548 |
|
| 549 |
if (pipe (sigpipe)) |
| 550 |
return 0; |
| 551 |
|
| 552 |
if (methods == EVMETHOD_AUTO) |
| 553 |
if (!enable_secure () && getenv ("LIBEV_METHODS")) |
| 554 |
methods = atoi (getenv ("LIBEV_METHODS")); |
| 555 |
else |
| 556 |
methods = EVMETHOD_ANY; |
| 557 |
|
| 558 |
ev_method = 0; |
| 559 |
#if EV_USE_KQUEUE |
| 560 |
if (!ev_method && (methods & EVMETHOD_KQUEUE)) kqueue_init (methods); |
| 561 |
#endif |
| 562 |
#if EV_USE_EPOLL |
| 563 |
if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods); |
| 564 |
#endif |
| 565 |
#if EV_USE_POLL |
| 566 |
if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods); |
| 567 |
#endif |
| 568 |
#if EV_USE_SELECT |
| 569 |
if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods); |
| 570 |
#endif |
| 571 |
|
| 572 |
if (ev_method) |
| 573 |
{ |
| 574 |
ev_watcher_init (&sigev, sigcb); |
| 575 |
siginit (); |
| 576 |
|
| 577 |
#ifndef WIN32 |
| 578 |
ev_signal_init (&childev, childcb, SIGCHLD); |
| 579 |
ev_signal_start (&childev); |
| 580 |
#endif |
| 581 |
} |
| 582 |
} |
| 583 |
|
| 584 |
return ev_method; |
| 585 |
} |
| 586 |
|
| 587 |
/*****************************************************************************/ |
| 588 |
|
| 589 |
void |
| 590 |
ev_fork_prepare (void) |
| 591 |
{ |
| 592 |
/* nop */ |
| 593 |
} |
| 594 |
|
| 595 |
void |
| 596 |
ev_fork_parent (void) |
| 597 |
{ |
| 598 |
/* nop */ |
| 599 |
} |
| 600 |
|
| 601 |
void |
| 602 |
ev_fork_child (void) |
| 603 |
{ |
| 604 |
#if EV_USE_EPOLL |
| 605 |
if (ev_method == EVMETHOD_EPOLL) |
| 606 |
epoll_postfork_child (); |
| 607 |
#endif |
| 608 |
|
| 609 |
ev_io_stop (&sigev); |
| 610 |
close (sigpipe [0]); |
| 611 |
close (sigpipe [1]); |
| 612 |
pipe (sigpipe); |
| 613 |
siginit (); |
| 614 |
} |
| 615 |
|
| 616 |
/*****************************************************************************/ |
| 617 |
|
| 618 |
static void |
| 619 |
call_pending (void) |
| 620 |
{ |
| 621 |
int pri; |
| 622 |
|
| 623 |
for (pri = NUMPRI; pri--; ) |
| 624 |
while (pendingcnt [pri]) |
| 625 |
{ |
| 626 |
ANPENDING *p = pendings [pri] + --pendingcnt [pri]; |
| 627 |
|
| 628 |
if (p->w) |
| 629 |
{ |
| 630 |
p->w->pending = 0; |
| 631 |
p->w->cb (p->w, p->events); |
| 632 |
} |
| 633 |
} |
| 634 |
} |
| 635 |
|
| 636 |
static void |
| 637 |
timers_reify (void) |
| 638 |
{ |
| 639 |
while (timercnt && timers [0]->at <= now) |
| 640 |
{ |
| 641 |
struct ev_timer *w = timers [0]; |
| 642 |
|
| 643 |
/* first reschedule or stop timer */ |
| 644 |
if (w->repeat) |
| 645 |
{ |
| 646 |
assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.)); |
| 647 |
w->at = now + w->repeat; |
| 648 |
downheap ((WT *)timers, timercnt, 0); |
| 649 |
} |
| 650 |
else |
| 651 |
ev_timer_stop (w); /* nonrepeating: stop timer */ |
| 652 |
|
| 653 |
event ((W)w, EV_TIMEOUT); |
| 654 |
} |
| 655 |
} |
| 656 |
|
| 657 |
static void |
| 658 |
periodics_reify (void) |
| 659 |
{ |
| 660 |
while (periodiccnt && periodics [0]->at <= ev_now) |
| 661 |
{ |
| 662 |
struct ev_periodic *w = periodics [0]; |
| 663 |
|
| 664 |
/* first reschedule or stop timer */ |
| 665 |
if (w->interval) |
| 666 |
{ |
| 667 |
w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval; |
| 668 |
assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now)); |
| 669 |
downheap ((WT *)periodics, periodiccnt, 0); |
| 670 |
} |
| 671 |
else |
| 672 |
ev_periodic_stop (w); /* nonrepeating: stop timer */ |
| 673 |
|
| 674 |
event ((W)w, EV_PERIODIC); |
| 675 |
} |
| 676 |
} |
| 677 |
|
| 678 |
static void |
| 679 |
periodics_reschedule (ev_tstamp diff) |
| 680 |
{ |
| 681 |
int i; |
| 682 |
|
| 683 |
/* adjust periodics after time jump */ |
| 684 |
for (i = 0; i < periodiccnt; ++i) |
| 685 |
{ |
| 686 |
struct ev_periodic *w = periodics [i]; |
| 687 |
|
| 688 |
if (w->interval) |
| 689 |
{ |
| 690 |
ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; |
| 691 |
|
| 692 |
if (fabs (diff) >= 1e-4) |
| 693 |
{ |
| 694 |
ev_periodic_stop (w); |
| 695 |
ev_periodic_start (w); |
| 696 |
|
| 697 |
i = 0; /* restart loop, inefficient, but time jumps should be rare */ |
| 698 |
} |
| 699 |
} |
| 700 |
} |
| 701 |
} |
| 702 |
|
| 703 |
static int |
| 704 |
time_update_monotonic (void) |
| 705 |
{ |
| 706 |
now = get_clock (); |
| 707 |
|
| 708 |
if (expect_true (now - now_floor < MIN_TIMEJUMP * .5)) |
| 709 |
{ |
| 710 |
ev_now = now + diff; |
| 711 |
return 0; |
| 712 |
} |
| 713 |
else |
| 714 |
{ |
| 715 |
now_floor = now; |
| 716 |
ev_now = ev_time (); |
| 717 |
return 1; |
| 718 |
} |
| 719 |
} |
| 720 |
|
| 721 |
static void |
| 722 |
time_update (void) |
| 723 |
{ |
| 724 |
int i; |
| 725 |
|
| 726 |
#if EV_USE_MONOTONIC |
| 727 |
if (expect_true (have_monotonic)) |
| 728 |
{ |
| 729 |
if (time_update_monotonic ()) |
| 730 |
{ |
| 731 |
ev_tstamp odiff = diff; |
| 732 |
|
| 733 |
for (i = 4; --i; ) /* loop a few times, before making important decisions */ |
| 734 |
{ |
| 735 |
diff = ev_now - now; |
| 736 |
|
| 737 |
if (fabs (odiff - diff) < MIN_TIMEJUMP) |
| 738 |
return; /* all is well */ |
| 739 |
|
| 740 |
ev_now = ev_time (); |
| 741 |
now = get_clock (); |
| 742 |
now_floor = now; |
| 743 |
} |
| 744 |
|
| 745 |
periodics_reschedule (diff - odiff); |
| 746 |
/* no timer adjustment, as the monotonic clock doesn't jump */ |
| 747 |
} |
| 748 |
} |
| 749 |
else |
| 750 |
#endif |
| 751 |
{ |
| 752 |
ev_now = ev_time (); |
| 753 |
|
| 754 |
if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)) |
| 755 |
{ |
| 756 |
periodics_reschedule (ev_now - now); |
| 757 |
|
| 758 |
/* adjust timers. this is easy, as the offset is the same for all */ |
| 759 |
for (i = 0; i < timercnt; ++i) |
| 760 |
timers [i]->at += diff; |
| 761 |
} |
| 762 |
|
| 763 |
now = ev_now; |
| 764 |
} |
| 765 |
} |
| 766 |
|
| 767 |
int ev_loop_done; |
| 768 |
|
| 769 |
void ev_loop (int flags) |
| 770 |
{ |
| 771 |
double block; |
| 772 |
ev_loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0; |
| 773 |
|
| 774 |
do |
| 775 |
{ |
| 776 |
/* queue check watchers (and execute them) */ |
| 777 |
if (expect_false (preparecnt)) |
| 778 |
{ |
| 779 |
queue_events ((W *)prepares, preparecnt, EV_PREPARE); |
| 780 |
call_pending (); |
| 781 |
} |
| 782 |
|
| 783 |
/* update fd-related kernel structures */ |
| 784 |
fd_reify (); |
| 785 |
|
| 786 |
/* calculate blocking time */ |
| 787 |
|
| 788 |
/* we only need this for !monotonic clockor timers, but as we basically |
| 789 |
always have timers, we just calculate it always */ |
| 790 |
#if EV_USE_MONOTONIC |
| 791 |
if (expect_true (have_monotonic)) |
| 792 |
time_update_monotonic (); |
| 793 |
else |
| 794 |
#endif |
| 795 |
{ |
| 796 |
ev_now = ev_time (); |
| 797 |
now = ev_now; |
| 798 |
} |
| 799 |
|
| 800 |
if (flags & EVLOOP_NONBLOCK || idlecnt) |
| 801 |
block = 0.; |
| 802 |
else |
| 803 |
{ |
| 804 |
block = MAX_BLOCKTIME; |
| 805 |
|
| 806 |
if (timercnt) |
| 807 |
{ |
| 808 |
ev_tstamp to = timers [0]->at - now + method_fudge; |
| 809 |
if (block > to) block = to; |
| 810 |
} |
| 811 |
|
| 812 |
if (periodiccnt) |
| 813 |
{ |
| 814 |
ev_tstamp to = periodics [0]->at - ev_now + method_fudge; |
| 815 |
if (block > to) block = to; |
| 816 |
} |
| 817 |
|
| 818 |
if (block < 0.) block = 0.; |
| 819 |
} |
| 820 |
|
| 821 |
method_poll (block); |
| 822 |
|
| 823 |
/* update ev_now, do magic */ |
| 824 |
time_update (); |
| 825 |
|
| 826 |
/* queue pending timers and reschedule them */ |
| 827 |
timers_reify (); /* relative timers called last */ |
| 828 |
periodics_reify (); /* absolute timers called first */ |
| 829 |
|
| 830 |
/* queue idle watchers unless io or timers are pending */ |
| 831 |
if (!pendingcnt) |
| 832 |
queue_events ((W *)idles, idlecnt, EV_IDLE); |
| 833 |
|
| 834 |
/* queue check watchers, to be executed first */ |
| 835 |
if (checkcnt) |
| 836 |
queue_events ((W *)checks, checkcnt, EV_CHECK); |
| 837 |
|
| 838 |
call_pending (); |
| 839 |
} |
| 840 |
while (!ev_loop_done); |
| 841 |
|
| 842 |
if (ev_loop_done != 2) |
| 843 |
ev_loop_done = 0; |
| 844 |
} |
| 845 |
|
| 846 |
/*****************************************************************************/ |
| 847 |
|
| 848 |
static void |
| 849 |
wlist_add (WL *head, WL elem) |
| 850 |
{ |
| 851 |
elem->next = *head; |
| 852 |
*head = elem; |
| 853 |
} |
| 854 |
|
| 855 |
static void |
| 856 |
wlist_del (WL *head, WL elem) |
| 857 |
{ |
| 858 |
while (*head) |
| 859 |
{ |
| 860 |
if (*head == elem) |
| 861 |
{ |
| 862 |
*head = elem->next; |
| 863 |
return; |
| 864 |
} |
| 865 |
|
| 866 |
head = &(*head)->next; |
| 867 |
} |
| 868 |
} |
| 869 |
|
| 870 |
static void |
| 871 |
ev_clear_pending (W w) |
| 872 |
{ |
| 873 |
if (w->pending) |
| 874 |
{ |
| 875 |
pendings [ABSPRI (w)][w->pending - 1].w = 0; |
| 876 |
w->pending = 0; |
| 877 |
} |
| 878 |
} |
| 879 |
|
| 880 |
static void |
| 881 |
ev_start (W w, int active) |
| 882 |
{ |
| 883 |
if (w->priority < EV_MINPRI) w->priority = EV_MINPRI; |
| 884 |
if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI; |
| 885 |
|
| 886 |
w->active = active; |
| 887 |
} |
| 888 |
|
| 889 |
static void |
| 890 |
ev_stop (W w) |
| 891 |
{ |
| 892 |
w->active = 0; |
| 893 |
} |
| 894 |
|
| 895 |
/*****************************************************************************/ |
| 896 |
|
| 897 |
void |
| 898 |
ev_io_start (struct ev_io *w) |
| 899 |
{ |
| 900 |
int fd = w->fd; |
| 901 |
|
| 902 |
if (ev_is_active (w)) |
| 903 |
return; |
| 904 |
|
| 905 |
assert (("ev_io_start called with negative fd", fd >= 0)); |
| 906 |
|
| 907 |
ev_start ((W)w, 1); |
| 908 |
array_needsize (anfds, anfdmax, fd + 1, anfds_init); |
| 909 |
wlist_add ((WL *)&anfds[fd].head, (WL)w); |
| 910 |
|
| 911 |
fd_change (fd); |
| 912 |
} |
| 913 |
|
| 914 |
void |
| 915 |
ev_io_stop (struct ev_io *w) |
| 916 |
{ |
| 917 |
ev_clear_pending ((W)w); |
| 918 |
if (!ev_is_active (w)) |
| 919 |
return; |
| 920 |
|
| 921 |
wlist_del ((WL *)&anfds[w->fd].head, (WL)w); |
| 922 |
ev_stop ((W)w); |
| 923 |
|
| 924 |
fd_change (w->fd); |
| 925 |
} |
| 926 |
|
| 927 |
void |
| 928 |
ev_timer_start (struct ev_timer *w) |
| 929 |
{ |
| 930 |
if (ev_is_active (w)) |
| 931 |
return; |
| 932 |
|
| 933 |
w->at += now; |
| 934 |
|
| 935 |
assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.)); |
| 936 |
|
| 937 |
ev_start ((W)w, ++timercnt); |
| 938 |
array_needsize (timers, timermax, timercnt, ); |
| 939 |
timers [timercnt - 1] = w; |
| 940 |
upheap ((WT *)timers, timercnt - 1); |
| 941 |
} |
| 942 |
|
| 943 |
void |
| 944 |
ev_timer_stop (struct ev_timer *w) |
| 945 |
{ |
| 946 |
ev_clear_pending ((W)w); |
| 947 |
if (!ev_is_active (w)) |
| 948 |
return; |
| 949 |
|
| 950 |
if (w->active < timercnt--) |
| 951 |
{ |
| 952 |
timers [w->active - 1] = timers [timercnt]; |
| 953 |
downheap ((WT *)timers, timercnt, w->active - 1); |
| 954 |
} |
| 955 |
|
| 956 |
w->at = w->repeat; |
| 957 |
|
| 958 |
ev_stop ((W)w); |
| 959 |
} |
| 960 |
|
| 961 |
void |
| 962 |
ev_timer_again (struct ev_timer *w) |
| 963 |
{ |
| 964 |
if (ev_is_active (w)) |
| 965 |
{ |
| 966 |
if (w->repeat) |
| 967 |
{ |
| 968 |
w->at = now + w->repeat; |
| 969 |
downheap ((WT *)timers, timercnt, w->active - 1); |
| 970 |
} |
| 971 |
else |
| 972 |
ev_timer_stop (w); |
| 973 |
} |
| 974 |
else if (w->repeat) |
| 975 |
ev_timer_start (w); |
| 976 |
} |
| 977 |
|
| 978 |
void |
| 979 |
ev_periodic_start (struct ev_periodic *w) |
| 980 |
{ |
| 981 |
if (ev_is_active (w)) |
| 982 |
return; |
| 983 |
|
| 984 |
assert (("ev_periodic_start called with negative interval value", w->interval >= 0.)); |
| 985 |
|
| 986 |
/* this formula differs from the one in periodic_reify because we do not always round up */ |
| 987 |
if (w->interval) |
| 988 |
w->at += ceil ((ev_now - w->at) / w->interval) * w->interval; |
| 989 |
|
| 990 |
ev_start ((W)w, ++periodiccnt); |
| 991 |
array_needsize (periodics, periodicmax, periodiccnt, ); |
| 992 |
periodics [periodiccnt - 1] = w; |
| 993 |
upheap ((WT *)periodics, periodiccnt - 1); |
| 994 |
} |
| 995 |
|
| 996 |
void |
| 997 |
ev_periodic_stop (struct ev_periodic *w) |
| 998 |
{ |
| 999 |
ev_clear_pending ((W)w); |
| 1000 |
if (!ev_is_active (w)) |
| 1001 |
return; |
| 1002 |
|
| 1003 |
if (w->active < periodiccnt--) |
| 1004 |
{ |
| 1005 |
periodics [w->active - 1] = periodics [periodiccnt]; |
| 1006 |
downheap ((WT *)periodics, periodiccnt, w->active - 1); |
| 1007 |
} |
| 1008 |
|
| 1009 |
ev_stop ((W)w); |
| 1010 |
} |
| 1011 |
|
| 1012 |
void |
| 1013 |
ev_signal_start (struct ev_signal *w) |
| 1014 |
{ |
| 1015 |
if (ev_is_active (w)) |
| 1016 |
return; |
| 1017 |
|
| 1018 |
assert (("ev_signal_start called with illegal signal number", w->signum > 0)); |
| 1019 |
|
| 1020 |
ev_start ((W)w, 1); |
| 1021 |
array_needsize (signals, signalmax, w->signum, signals_init); |
| 1022 |
wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); |
| 1023 |
|
| 1024 |
if (!w->next) |
| 1025 |
{ |
| 1026 |
struct sigaction sa; |
| 1027 |
sa.sa_handler = sighandler; |
| 1028 |
sigfillset (&sa.sa_mask); |
| 1029 |
sa.sa_flags = 0; |
| 1030 |
sigaction (w->signum, &sa, 0); |
| 1031 |
} |
| 1032 |
} |
| 1033 |
|
| 1034 |
void |
| 1035 |
ev_signal_stop (struct ev_signal *w) |
| 1036 |
{ |
| 1037 |
ev_clear_pending ((W)w); |
| 1038 |
if (!ev_is_active (w)) |
| 1039 |
return; |
| 1040 |
|
| 1041 |
wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w); |
| 1042 |
ev_stop ((W)w); |
| 1043 |
|
| 1044 |
if (!signals [w->signum - 1].head) |
| 1045 |
signal (w->signum, SIG_DFL); |
| 1046 |
} |
| 1047 |
|
| 1048 |
void |
| 1049 |
ev_idle_start (struct ev_idle *w) |
| 1050 |
{ |
| 1051 |
if (ev_is_active (w)) |
| 1052 |
return; |
| 1053 |
|
| 1054 |
ev_start ((W)w, ++idlecnt); |
| 1055 |
array_needsize (idles, idlemax, idlecnt, ); |
| 1056 |
idles [idlecnt - 1] = w; |
| 1057 |
} |
| 1058 |
|
| 1059 |
void |
| 1060 |
ev_idle_stop (struct ev_idle *w) |
| 1061 |
{ |
| 1062 |
ev_clear_pending ((W)w); |
| 1063 |
if (ev_is_active (w)) |
| 1064 |
return; |
| 1065 |
|
| 1066 |
idles [w->active - 1] = idles [--idlecnt]; |
| 1067 |
ev_stop ((W)w); |
| 1068 |
} |
| 1069 |
|
| 1070 |
void |
| 1071 |
ev_prepare_start (struct ev_prepare *w) |
| 1072 |
{ |
| 1073 |
if (ev_is_active (w)) |
| 1074 |
return; |
| 1075 |
|
| 1076 |
ev_start ((W)w, ++preparecnt); |
| 1077 |
array_needsize (prepares, preparemax, preparecnt, ); |
| 1078 |
prepares [preparecnt - 1] = w; |
| 1079 |
} |
| 1080 |
|
| 1081 |
void |
| 1082 |
ev_prepare_stop (struct ev_prepare *w) |
| 1083 |
{ |
| 1084 |
ev_clear_pending ((W)w); |
| 1085 |
if (ev_is_active (w)) |
| 1086 |
return; |
| 1087 |
|
| 1088 |
prepares [w->active - 1] = prepares [--preparecnt]; |
| 1089 |
ev_stop ((W)w); |
| 1090 |
} |
| 1091 |
|
| 1092 |
void |
| 1093 |
ev_check_start (struct ev_check *w) |
| 1094 |
{ |
| 1095 |
if (ev_is_active (w)) |
| 1096 |
return; |
| 1097 |
|
| 1098 |
ev_start ((W)w, ++checkcnt); |
| 1099 |
array_needsize (checks, checkmax, checkcnt, ); |
| 1100 |
checks [checkcnt - 1] = w; |
| 1101 |
} |
| 1102 |
|
| 1103 |
void |
| 1104 |
ev_check_stop (struct ev_check *w) |
| 1105 |
{ |
| 1106 |
ev_clear_pending ((W)w); |
| 1107 |
if (ev_is_active (w)) |
| 1108 |
return; |
| 1109 |
|
| 1110 |
checks [w->active - 1] = checks [--checkcnt]; |
| 1111 |
ev_stop ((W)w); |
| 1112 |
} |
| 1113 |
|
| 1114 |
void |
| 1115 |
ev_child_start (struct ev_child *w) |
| 1116 |
{ |
| 1117 |
if (ev_is_active (w)) |
| 1118 |
return; |
| 1119 |
|
| 1120 |
ev_start ((W)w, 1); |
| 1121 |
wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w); |
| 1122 |
} |
| 1123 |
|
| 1124 |
void |
| 1125 |
ev_child_stop (struct ev_child *w) |
| 1126 |
{ |
| 1127 |
ev_clear_pending ((W)w); |
| 1128 |
if (ev_is_active (w)) |
| 1129 |
return; |
| 1130 |
|
| 1131 |
wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w); |
| 1132 |
ev_stop ((W)w); |
| 1133 |
} |
| 1134 |
|
| 1135 |
/*****************************************************************************/ |
| 1136 |
|
| 1137 |
struct ev_once |
| 1138 |
{ |
| 1139 |
struct ev_io io; |
| 1140 |
struct ev_timer to; |
| 1141 |
void (*cb)(int revents, void *arg); |
| 1142 |
void *arg; |
| 1143 |
}; |
| 1144 |
|
| 1145 |
static void |
| 1146 |
once_cb (struct ev_once *once, int revents) |
| 1147 |
{ |
| 1148 |
void (*cb)(int revents, void *arg) = once->cb; |
| 1149 |
void *arg = once->arg; |
| 1150 |
|
| 1151 |
ev_io_stop (&once->io); |
| 1152 |
ev_timer_stop (&once->to); |
| 1153 |
free (once); |
| 1154 |
|
| 1155 |
cb (revents, arg); |
| 1156 |
} |
| 1157 |
|
| 1158 |
static void |
| 1159 |
once_cb_io (struct ev_io *w, int revents) |
| 1160 |
{ |
| 1161 |
once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents); |
| 1162 |
} |
| 1163 |
|
| 1164 |
static void |
| 1165 |
once_cb_to (struct ev_timer *w, int revents) |
| 1166 |
{ |
| 1167 |
once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents); |
| 1168 |
} |
| 1169 |
|
| 1170 |
void |
| 1171 |
ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg) |
| 1172 |
{ |
| 1173 |
struct ev_once *once = malloc (sizeof (struct ev_once)); |
| 1174 |
|
| 1175 |
if (!once) |
| 1176 |
cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg); |
| 1177 |
else |
| 1178 |
{ |
| 1179 |
once->cb = cb; |
| 1180 |
once->arg = arg; |
| 1181 |
|
| 1182 |
ev_watcher_init (&once->io, once_cb_io); |
| 1183 |
if (fd >= 0) |
| 1184 |
{ |
| 1185 |
ev_io_set (&once->io, fd, events); |
| 1186 |
ev_io_start (&once->io); |
| 1187 |
} |
| 1188 |
|
| 1189 |
ev_watcher_init (&once->to, once_cb_to); |
| 1190 |
if (timeout >= 0.) |
| 1191 |
{ |
| 1192 |
ev_timer_set (&once->to, timeout, 0.); |
| 1193 |
ev_timer_start (&once->to); |
| 1194 |
} |
| 1195 |
} |
| 1196 |
} |
| 1197 |
|
| 1198 |
/*****************************************************************************/ |
| 1199 |
|
| 1200 |
#if 0 |
| 1201 |
|
| 1202 |
struct ev_io wio; |
| 1203 |
|
| 1204 |
static void |
| 1205 |
sin_cb (struct ev_io *w, int revents) |
| 1206 |
{ |
| 1207 |
fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); |
| 1208 |
} |
| 1209 |
|
| 1210 |
static void |
| 1211 |
ocb (struct ev_timer *w, int revents) |
| 1212 |
{ |
| 1213 |
//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); |
| 1214 |
ev_timer_stop (w); |
| 1215 |
ev_timer_start (w); |
| 1216 |
} |
| 1217 |
|
| 1218 |
static void |
| 1219 |
scb (struct ev_signal *w, int revents) |
| 1220 |
{ |
| 1221 |
fprintf (stderr, "signal %x,%d\n", revents, w->signum); |
| 1222 |
ev_io_stop (&wio); |
| 1223 |
ev_io_start (&wio); |
| 1224 |
} |
| 1225 |
|
| 1226 |
static void |
| 1227 |
gcb (struct ev_signal *w, int revents) |
| 1228 |
{ |
| 1229 |
fprintf (stderr, "generic %x\n", revents); |
| 1230 |
|
| 1231 |
} |
| 1232 |
|
| 1233 |
int main (void) |
| 1234 |
{ |
| 1235 |
ev_init (0); |
| 1236 |
|
| 1237 |
ev_io_init (&wio, sin_cb, 0, EV_READ); |
| 1238 |
ev_io_start (&wio); |
| 1239 |
|
| 1240 |
struct ev_timer t[10000]; |
| 1241 |
|
| 1242 |
#if 0 |
| 1243 |
int i; |
| 1244 |
for (i = 0; i < 10000; ++i) |
| 1245 |
{ |
| 1246 |
struct ev_timer *w = t + i; |
| 1247 |
ev_watcher_init (w, ocb, i); |
| 1248 |
ev_timer_init_abs (w, ocb, drand48 (), 0.99775533); |
| 1249 |
ev_timer_start (w); |
| 1250 |
if (drand48 () < 0.5) |
| 1251 |
ev_timer_stop (w); |
| 1252 |
} |
| 1253 |
#endif |
| 1254 |
|
| 1255 |
struct ev_timer t1; |
| 1256 |
ev_timer_init (&t1, ocb, 5, 10); |
| 1257 |
ev_timer_start (&t1); |
| 1258 |
|
| 1259 |
struct ev_signal sig; |
| 1260 |
ev_signal_init (&sig, scb, SIGQUIT); |
| 1261 |
ev_signal_start (&sig); |
| 1262 |
|
| 1263 |
struct ev_check cw; |
| 1264 |
ev_check_init (&cw, gcb); |
| 1265 |
ev_check_start (&cw); |
| 1266 |
|
| 1267 |
struct ev_idle iw; |
| 1268 |
ev_idle_init (&iw, gcb); |
| 1269 |
ev_idle_start (&iw); |
| 1270 |
|
| 1271 |
ev_loop (0); |
| 1272 |
|
| 1273 |
return 0; |
| 1274 |
} |
| 1275 |
|
| 1276 |
#endif |
| 1277 |
|
| 1278 |
|
| 1279 |
|
| 1280 |
|
