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root |
1.1 |
#include <math.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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1.4 |
#include <assert.h> |
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1.1 |
#include <errno.h> |
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#include <sys/time.h> |
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#include <time.h> |
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#ifdef CLOCK_MONOTONIC |
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# define HAVE_MONOTONIC 1 |
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#endif |
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#define HAVE_EPOLL 1 |
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#define HAVE_REALTIME 1 |
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#define HAVE_SELECT 0 |
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root |
1.4 |
#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ |
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1.1 |
#define MAX_BLOCKTIME 60. |
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#include "ev.h" |
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struct ev_watcher { |
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EV_WATCHER (ev_watcher); |
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}; |
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struct ev_watcher_list { |
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EV_WATCHER_LIST (ev_watcher_list); |
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}; |
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1.4 |
static ev_tstamp now, diff; /* monotonic clock */ |
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root |
1.1 |
ev_tstamp ev_now; |
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int ev_method; |
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static int have_monotonic; /* runtime */ |
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static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */ |
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static void (*method_reify)(void); |
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static void (*method_poll)(ev_tstamp timeout); |
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ev_tstamp |
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ev_time (void) |
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{ |
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#if HAVE_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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static ev_tstamp |
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get_clock (void) |
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{ |
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#if HAVE_MONOTONIC |
60 |
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if (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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return ev_time (); |
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} |
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#define array_needsize(base,cur,cnt,init) \ |
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if ((cnt) > cur) \ |
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{ \ |
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1.2 |
int newcnt = cur ? cur << 1 : 16; \ |
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1.1 |
fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\ |
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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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typedef struct |
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{ |
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struct ev_io *head; |
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unsigned char wev, rev; /* want, received event set */ |
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} ANFD; |
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static ANFD *anfds; |
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static int anfdmax; |
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static int *fdchanges; |
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static int fdchangemax, fdchangecnt; |
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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->wev = base->rev = EV_NONE; |
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++base; |
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} |
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} |
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typedef struct |
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{ |
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struct ev_watcher *w; |
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int events; |
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} ANPENDING; |
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static ANPENDING *pendings; |
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static int pendingmax, pendingcnt; |
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static void |
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event (struct ev_watcher *w, int events) |
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{ |
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w->pending = ++pendingcnt; |
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array_needsize (pendings, pendingmax, pendingcnt, ); |
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pendings [pendingcnt - 1].w = w; |
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pendings [pendingcnt - 1].events = events; |
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} |
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122 |
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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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128 |
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for (w = anfd->head; w; w = w->next) |
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{ |
130 |
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int ev = w->events & events; |
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132 |
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if (ev) |
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event ((struct ev_watcher *)w, ev); |
134 |
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} |
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} |
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root |
1.4 |
static struct ev_timer **atimers; |
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static int atimermax, atimercnt; |
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static struct ev_timer **rtimers; |
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static int rtimermax, rtimercnt; |
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root |
1.1 |
|
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static void |
144 |
root |
1.4 |
upheap (struct ev_timer **timers, int k) |
145 |
root |
1.1 |
{ |
146 |
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struct ev_timer *w = timers [k]; |
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148 |
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while (k && timers [k >> 1]->at > w->at) |
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{ |
150 |
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timers [k] = timers [k >> 1]; |
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timers [k]->active = k + 1; |
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k >>= 1; |
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} |
154 |
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timers [k] = w; |
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timers [k]->active = k + 1; |
157 |
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158 |
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} |
159 |
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160 |
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static void |
161 |
root |
1.4 |
downheap (struct ev_timer **timers, int N, int k) |
162 |
root |
1.1 |
{ |
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struct ev_timer *w = timers [k]; |
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165 |
root |
1.4 |
while (k < (N >> 1)) |
166 |
root |
1.1 |
{ |
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int j = k << 1; |
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169 |
root |
1.4 |
if (j + 1 < N && timers [j]->at > timers [j + 1]->at) |
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root |
1.1 |
++j; |
171 |
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172 |
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if (w->at <= timers [j]->at) |
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break; |
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timers [k] = timers [j]; |
176 |
root |
1.2 |
timers [k]->active = k + 1; |
177 |
root |
1.1 |
k = j; |
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} |
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timers [k] = w; |
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timers [k]->active = k + 1; |
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} |
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184 |
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static struct ev_signal **signals; |
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root |
1.4 |
static int signalmax; |
186 |
root |
1.1 |
|
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static void |
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signals_init (struct ev_signal **base, int count) |
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{ |
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while (count--) |
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*base++ = 0; |
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} |
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#if HAVE_EPOLL |
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# include "ev_epoll.c" |
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#endif |
197 |
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#if HAVE_SELECT |
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# include "ev_select.c" |
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#endif |
200 |
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201 |
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int ev_init (int flags) |
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{ |
203 |
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#if HAVE_MONOTONIC |
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{ |
205 |
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struct timespec ts; |
206 |
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if (!clock_gettime (CLOCK_MONOTONIC, &ts)) |
207 |
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have_monotonic = 1; |
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} |
209 |
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#endif |
210 |
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211 |
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ev_now = ev_time (); |
212 |
root |
1.4 |
now = get_clock (); |
213 |
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diff = ev_now - now; |
214 |
root |
1.1 |
|
215 |
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#if HAVE_EPOLL |
216 |
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if (epoll_init (flags)) |
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return ev_method; |
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#endif |
219 |
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#if HAVE_SELECT |
220 |
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if (select_init (flags)) |
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return ev_method; |
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#endif |
223 |
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224 |
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ev_method = EVMETHOD_NONE; |
225 |
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return ev_method; |
226 |
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} |
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228 |
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void ev_prefork (void) |
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{ |
230 |
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} |
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void ev_postfork_parent (void) |
233 |
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{ |
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} |
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void ev_postfork_child (void) |
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{ |
238 |
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#if HAVE_EPOLL |
239 |
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epoll_postfork_child (); |
240 |
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#endif |
241 |
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} |
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243 |
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static void |
244 |
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call_pending () |
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{ |
246 |
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int i; |
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248 |
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for (i = 0; i < pendingcnt; ++i) |
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{ |
250 |
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ANPENDING *p = pendings + i; |
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252 |
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if (p->w) |
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{ |
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p->w->pending = 0; |
255 |
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p->w->cb (p->w, p->events); |
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} |
257 |
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} |
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259 |
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pendingcnt = 0; |
260 |
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} |
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262 |
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static void |
263 |
root |
1.4 |
timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) |
264 |
root |
1.1 |
{ |
265 |
root |
1.4 |
while (timercnt && timers [0]->at <= now) |
266 |
root |
1.1 |
{ |
267 |
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struct ev_timer *w = timers [0]; |
268 |
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269 |
root |
1.4 |
/* first reschedule or stop timer */ |
270 |
root |
1.1 |
if (w->repeat) |
271 |
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{ |
272 |
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if (w->is_abs) |
273 |
root |
1.4 |
w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat; |
274 |
root |
1.1 |
else |
275 |
root |
1.4 |
w->at = now + w->repeat; |
276 |
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277 |
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assert (w->at > now); |
278 |
root |
1.1 |
|
279 |
root |
1.4 |
downheap (timers, timercnt, 0); |
280 |
root |
1.1 |
} |
281 |
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else |
282 |
root |
1.4 |
{ |
283 |
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evtimer_stop (w); /* nonrepeating: stop timer */ |
284 |
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--timercnt; /* maybe pass by reference instead? */ |
285 |
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} |
286 |
root |
1.1 |
|
287 |
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event ((struct ev_watcher *)w, EV_TIMEOUT); |
288 |
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} |
289 |
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} |
290 |
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291 |
root |
1.4 |
static void |
292 |
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time_update () |
293 |
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{ |
294 |
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int i; |
295 |
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ev_now = ev_time (); |
296 |
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297 |
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if (have_monotonic) |
298 |
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{ |
299 |
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ev_tstamp odiff = diff; |
300 |
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301 |
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/* detecting time jumps is much more difficult */ |
302 |
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for (i = 2; --i; ) /* loop a few times, before making important decisions */ |
303 |
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{ |
304 |
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now = get_clock (); |
305 |
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diff = ev_now - now; |
306 |
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307 |
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if (fabs (odiff - diff) < MIN_TIMEJUMP) |
308 |
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return; /* all is well */ |
309 |
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310 |
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ev_now = ev_time (); |
311 |
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} |
312 |
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313 |
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/* time jump detected, reschedule atimers */ |
314 |
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for (i = 0; i < atimercnt; ++i) |
315 |
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{ |
316 |
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struct ev_timer *w = atimers [i]; |
317 |
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w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat; |
318 |
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} |
319 |
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} |
320 |
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else |
321 |
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{ |
322 |
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if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP) |
323 |
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/* time jump detected, adjust rtimers */ |
324 |
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for (i = 0; i < rtimercnt; ++i) |
325 |
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rtimers [i]->at += ev_now - now; |
326 |
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327 |
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now = ev_now; |
328 |
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} |
329 |
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} |
330 |
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331 |
root |
1.1 |
int ev_loop_done; |
332 |
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|
333 |
root |
1.4 |
void ev_loop (int flags) |
334 |
root |
1.1 |
{ |
335 |
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double block; |
336 |
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ev_loop_done = flags & EVLOOP_ONESHOT; |
337 |
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338 |
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do |
339 |
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{ |
340 |
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/* update fd-related kernel structures */ |
341 |
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method_reify (); fdchangecnt = 0; |
342 |
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343 |
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/* calculate blocking time */ |
344 |
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if (flags & EVLOOP_NONBLOCK) |
345 |
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block = 0.; |
346 |
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else |
347 |
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{ |
348 |
root |
1.4 |
block = MAX_BLOCKTIME; |
349 |
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350 |
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if (rtimercnt) |
351 |
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{ |
352 |
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ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge; |
353 |
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if (block > to) block = to; |
354 |
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} |
355 |
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356 |
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if (atimercnt) |
357 |
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{ |
358 |
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ev_tstamp to = atimers [0]->at - ev_time () + method_fudge; |
359 |
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if (block > to) block = to; |
360 |
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} |
361 |
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362 |
root |
1.1 |
if (block < 0.) block = 0.; |
363 |
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} |
364 |
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365 |
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method_poll (block); |
366 |
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367 |
root |
1.4 |
/* update ev_now, do magic */ |
368 |
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time_update (); |
369 |
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|
370 |
root |
1.1 |
/* put pending timers into pendign queue and reschedule them */ |
371 |
root |
1.4 |
/* absolute timers first */ |
372 |
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timers_reify (atimers, atimercnt, ev_now); |
373 |
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/* relative timers second */ |
374 |
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timers_reify (rtimers, rtimercnt, now); |
375 |
root |
1.1 |
|
376 |
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call_pending (); |
377 |
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} |
378 |
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while (!ev_loop_done); |
379 |
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} |
380 |
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381 |
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static void |
382 |
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wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem) |
383 |
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{ |
384 |
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elem->next = *head; |
385 |
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*head = elem; |
386 |
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} |
387 |
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388 |
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static void |
389 |
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wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) |
390 |
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{ |
391 |
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while (*head) |
392 |
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{ |
393 |
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if (*head == elem) |
394 |
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{ |
395 |
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*head = elem->next; |
396 |
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return; |
397 |
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} |
398 |
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399 |
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head = &(*head)->next; |
400 |
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} |
401 |
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} |
402 |
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403 |
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static void |
404 |
|
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ev_start (struct ev_watcher *w, int active) |
405 |
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{ |
406 |
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w->pending = 0; |
407 |
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w->active = active; |
408 |
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} |
409 |
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|
410 |
|
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static void |
411 |
|
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ev_stop (struct ev_watcher *w) |
412 |
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{ |
413 |
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if (w->pending) |
414 |
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pendings [w->pending - 1].w = 0; |
415 |
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416 |
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w->active = 0; |
417 |
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/* nop */ |
418 |
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} |
419 |
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|
420 |
|
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void |
421 |
|
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evio_start (struct ev_io *w) |
422 |
|
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{ |
423 |
|
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if (ev_is_active (w)) |
424 |
|
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return; |
425 |
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|
426 |
|
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int fd = w->fd; |
427 |
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|
428 |
|
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ev_start ((struct ev_watcher *)w, 1); |
429 |
|
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array_needsize (anfds, anfdmax, fd + 1, anfds_init); |
430 |
|
|
wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w); |
431 |
|
|
|
432 |
|
|
++fdchangecnt; |
433 |
|
|
array_needsize (fdchanges, fdchangemax, fdchangecnt, ); |
434 |
|
|
fdchanges [fdchangecnt - 1] = fd; |
435 |
|
|
} |
436 |
|
|
|
437 |
|
|
void |
438 |
|
|
evio_stop (struct ev_io *w) |
439 |
|
|
{ |
440 |
|
|
if (!ev_is_active (w)) |
441 |
|
|
return; |
442 |
|
|
|
443 |
|
|
wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w); |
444 |
|
|
ev_stop ((struct ev_watcher *)w); |
445 |
|
|
|
446 |
|
|
++fdchangecnt; |
447 |
|
|
array_needsize (fdchanges, fdchangemax, fdchangecnt, ); |
448 |
|
|
fdchanges [fdchangecnt - 1] = w->fd; |
449 |
|
|
} |
450 |
|
|
|
451 |
|
|
void |
452 |
|
|
evtimer_start (struct ev_timer *w) |
453 |
|
|
{ |
454 |
|
|
if (ev_is_active (w)) |
455 |
|
|
return; |
456 |
|
|
|
457 |
|
|
if (w->is_abs) |
458 |
|
|
{ |
459 |
root |
1.2 |
/* this formula differs from the one in timer_reify becuse we do not round up */ |
460 |
root |
1.1 |
if (w->repeat) |
461 |
|
|
w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat; |
462 |
root |
1.4 |
|
463 |
|
|
ev_start ((struct ev_watcher *)w, ++atimercnt); |
464 |
|
|
array_needsize (atimers, atimermax, atimercnt, ); |
465 |
|
|
atimers [atimercnt - 1] = w; |
466 |
|
|
upheap (atimers, atimercnt - 1); |
467 |
root |
1.1 |
} |
468 |
|
|
else |
469 |
root |
1.4 |
{ |
470 |
|
|
w->at += now; |
471 |
|
|
|
472 |
|
|
ev_start ((struct ev_watcher *)w, ++rtimercnt); |
473 |
|
|
array_needsize (rtimers, rtimermax, rtimercnt, ); |
474 |
|
|
rtimers [rtimercnt - 1] = w; |
475 |
|
|
upheap (rtimers, rtimercnt - 1); |
476 |
|
|
} |
477 |
root |
1.1 |
|
478 |
|
|
} |
479 |
|
|
|
480 |
|
|
void |
481 |
|
|
evtimer_stop (struct ev_timer *w) |
482 |
|
|
{ |
483 |
|
|
if (!ev_is_active (w)) |
484 |
|
|
return; |
485 |
|
|
|
486 |
root |
1.4 |
if (w->is_abs) |
487 |
root |
1.2 |
{ |
488 |
root |
1.4 |
if (w->active < atimercnt--) |
489 |
|
|
{ |
490 |
|
|
atimers [w->active - 1] = atimers [atimercnt]; |
491 |
|
|
downheap (atimers, atimercnt, w->active - 1); |
492 |
|
|
} |
493 |
|
|
} |
494 |
|
|
else |
495 |
|
|
{ |
496 |
|
|
if (w->active < rtimercnt--) |
497 |
|
|
{ |
498 |
|
|
rtimers [w->active - 1] = rtimers [rtimercnt]; |
499 |
|
|
downheap (rtimers, rtimercnt, w->active - 1); |
500 |
|
|
} |
501 |
root |
1.2 |
} |
502 |
|
|
|
503 |
root |
1.1 |
ev_stop ((struct ev_watcher *)w); |
504 |
|
|
} |
505 |
|
|
|
506 |
|
|
void |
507 |
|
|
evsignal_start (struct ev_signal *w) |
508 |
|
|
{ |
509 |
|
|
if (ev_is_active (w)) |
510 |
|
|
return; |
511 |
|
|
|
512 |
|
|
ev_start ((struct ev_watcher *)w, 1); |
513 |
|
|
array_needsize (signals, signalmax, w->signum, signals_init); |
514 |
|
|
wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w); |
515 |
|
|
} |
516 |
|
|
|
517 |
|
|
void |
518 |
|
|
evsignal_stop (struct ev_signal *w) |
519 |
|
|
{ |
520 |
|
|
if (!ev_is_active (w)) |
521 |
|
|
return; |
522 |
|
|
|
523 |
|
|
wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w); |
524 |
|
|
ev_stop ((struct ev_watcher *)w); |
525 |
|
|
} |
526 |
|
|
|
527 |
|
|
/*****************************************************************************/ |
528 |
|
|
#if 1 |
529 |
|
|
|
530 |
|
|
static void |
531 |
|
|
sin_cb (struct ev_io *w, int revents) |
532 |
|
|
{ |
533 |
|
|
fprintf (stderr, "sin %d, revents %d\n", w->fd, revents); |
534 |
|
|
} |
535 |
|
|
|
536 |
|
|
static void |
537 |
|
|
ocb (struct ev_timer *w, int revents) |
538 |
|
|
{ |
539 |
root |
1.4 |
//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data); |
540 |
|
|
evtimer_stop (w); |
541 |
|
|
evtimer_start (w); |
542 |
root |
1.1 |
} |
543 |
|
|
|
544 |
|
|
int main (void) |
545 |
|
|
{ |
546 |
|
|
struct ev_io sin; |
547 |
|
|
|
548 |
|
|
ev_init (0); |
549 |
|
|
|
550 |
|
|
evw_init (&sin, sin_cb, 55); |
551 |
|
|
evio_set (&sin, 0, EV_READ); |
552 |
|
|
evio_start (&sin); |
553 |
|
|
|
554 |
root |
1.4 |
struct ev_timer t[10000]; |
555 |
root |
1.2 |
|
556 |
root |
1.4 |
#if 1 |
557 |
root |
1.2 |
int i; |
558 |
root |
1.4 |
for (i = 0; i < 10000; ++i) |
559 |
root |
1.2 |
{ |
560 |
|
|
struct ev_timer *w = t + i; |
561 |
|
|
evw_init (w, ocb, i); |
562 |
root |
1.4 |
evtimer_set_abs (w, drand48 (), 0.99775533); |
563 |
root |
1.2 |
evtimer_start (w); |
564 |
|
|
if (drand48 () < 0.5) |
565 |
|
|
evtimer_stop (w); |
566 |
|
|
} |
567 |
root |
1.4 |
#endif |
568 |
|
|
|
569 |
|
|
struct ev_timer t1; |
570 |
|
|
evw_init (&t1, ocb, 0); |
571 |
|
|
evtimer_set_abs (&t1, 5, 10); |
572 |
|
|
evtimer_start (&t1); |
573 |
root |
1.1 |
|
574 |
|
|
ev_loop (0); |
575 |
|
|
|
576 |
|
|
return 0; |
577 |
|
|
} |
578 |
|
|
|
579 |
|
|
#endif |
580 |
|
|
|
581 |
|
|
|
582 |
|
|
|
583 |
|
|
|