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ev.c
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ev.c
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/*
* libev event processing core, watcher management
*
* Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libev@schmorp.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License ("GPL") version 2 or any later version,
* in which case the provisions of the GPL are applicable instead of
* the above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use your
* version of this file under the BSD license, indicate your decision
* by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete the
* provisions above, a recipient may use your version of this file under
* either the BSD or the GPL.
*/
/* this big block deduces configuration from config.h */
#ifndef EV_STANDALONE
# ifdef EV_CONFIG_H
# include EV_CONFIG_H
# else
# include "config.h"
# endif
# if HAVE_CLOCK_SYSCALL
# ifndef EV_USE_CLOCK_SYSCALL
# define EV_USE_CLOCK_SYSCALL 1
# ifndef EV_USE_REALTIME
# define EV_USE_REALTIME 0
# endif
# ifndef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 1
# endif
# endif
# elif !defined(EV_USE_CLOCK_SYSCALL)
# define EV_USE_CLOCK_SYSCALL 0
# endif
# if HAVE_CLOCK_GETTIME
# ifndef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 1
# endif
# ifndef EV_USE_REALTIME
# define EV_USE_REALTIME 0
# endif
# else
# ifndef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 0
# endif
# ifndef EV_USE_REALTIME
# define EV_USE_REALTIME 0
# endif
# endif
# if HAVE_NANOSLEEP
# ifndef EV_USE_NANOSLEEP
# define EV_USE_NANOSLEEP EV_FEATURE_OS
# endif
# else
# undef EV_USE_NANOSLEEP
# define EV_USE_NANOSLEEP 0
# endif
# if HAVE_SELECT && HAVE_SYS_SELECT_H
# ifndef EV_USE_SELECT
# define EV_USE_SELECT EV_FEATURE_BACKENDS
# endif
# else
# undef EV_USE_SELECT
# define EV_USE_SELECT 0
# endif
# if HAVE_POLL && HAVE_POLL_H
# ifndef EV_USE_POLL
# define EV_USE_POLL EV_FEATURE_BACKENDS
# endif
# else
# undef EV_USE_POLL
# define EV_USE_POLL 0
# endif
# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
# ifndef EV_USE_EPOLL
# define EV_USE_EPOLL EV_FEATURE_BACKENDS
# endif
# else
# undef EV_USE_EPOLL
# define EV_USE_EPOLL 0
# endif
# if HAVE_KQUEUE && HAVE_SYS_EVENT_H
# ifndef EV_USE_KQUEUE
# define EV_USE_KQUEUE EV_FEATURE_BACKENDS
# endif
# else
# undef EV_USE_KQUEUE
# define EV_USE_KQUEUE 0
# endif
# if HAVE_PORT_H && HAVE_PORT_CREATE
# ifndef EV_USE_PORT
# define EV_USE_PORT EV_FEATURE_BACKENDS
# endif
# else
# undef EV_USE_PORT
# define EV_USE_PORT 0
# endif
# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
# ifndef EV_USE_INOTIFY
# define EV_USE_INOTIFY EV_FEATURE_OS
# endif
# else
# undef EV_USE_INOTIFY
# define EV_USE_INOTIFY 0
# endif
# if HAVE_SIGNALFD && HAVE_SYS_SIGNALFD_H
# ifndef EV_USE_SIGNALFD
# define EV_USE_SIGNALFD EV_FEATURE_OS
# endif
# else
# undef EV_USE_SIGNALFD
# define EV_USE_SIGNALFD 0
# endif
# if HAVE_EVENTFD
# ifndef EV_USE_EVENTFD
# define EV_USE_EVENTFD EV_FEATURE_OS
# endif
# else
# undef EV_USE_EVENTFD
# define EV_USE_EVENTFD 0
# endif
#endif
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <sys/types.h>
#include <time.h>
#include <limits.h>
#include <signal.h>
#ifdef EV_H
# include EV_H
#else
# include "ev.h"
#endif
EV_CPP(extern "C" {)
#ifndef _WIN32
# include <sys/time.h>
# include <sys/wait.h>
# include <unistd.h>
#else
# include <io.h>
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
# ifndef EV_SELECT_IS_WINSOCKET
# define EV_SELECT_IS_WINSOCKET 1
# endif
# undef EV_AVOID_STDIO
#endif
/* OS X, in its infinite idiocy, actually HARDCODES
* a limit of 1024 into their select. Where people have brains,
* OS X engineers apparently have a vacuum. Or maybe they were
* ordered to have a vacuum, or they do anything for money.
* This might help. Or not.
*/
#define _DARWIN_UNLIMITED_SELECT 1
/* this block tries to deduce configuration from header-defined symbols and defaults */
/* try to deduce the maximum number of signals on this platform */
#if defined (EV_NSIG)
/* use what's provided */
#elif defined (NSIG)
# define EV_NSIG (NSIG)
#elif defined(_NSIG)
# define EV_NSIG (_NSIG)
#elif defined (SIGMAX)
# define EV_NSIG (SIGMAX+1)
#elif defined (SIG_MAX)
# define EV_NSIG (SIG_MAX+1)
#elif defined (_SIG_MAX)
# define EV_NSIG (_SIG_MAX+1)
#elif defined (MAXSIG)
# define EV_NSIG (MAXSIG+1)
#elif defined (MAX_SIG)
# define EV_NSIG (MAX_SIG+1)
#elif defined (SIGARRAYSIZE)
# define EV_NSIG (SIGARRAYSIZE) /* Assume ary[SIGARRAYSIZE] */
#elif defined (_sys_nsig)
# define EV_NSIG (_sys_nsig) /* Solaris 2.5 */
#else
# error "unable to find value for NSIG, please report"
/* to make it compile regardless, just remove the above line, */
/* but consider reporting it, too! :) */
# define EV_NSIG 65
#endif
#ifndef EV_USE_CLOCK_SYSCALL
# if __linux && __GLIBC__ >= 2
# define EV_USE_CLOCK_SYSCALL EV_FEATURE_OS
# else
# define EV_USE_CLOCK_SYSCALL 0
# endif
#endif
#ifndef EV_USE_MONOTONIC
# if defined (_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0
# define EV_USE_MONOTONIC EV_FEATURE_OS
# else
# define EV_USE_MONOTONIC 0
# endif
#endif
#ifndef EV_USE_REALTIME
# define EV_USE_REALTIME !EV_USE_CLOCK_SYSCALL
#endif
#ifndef EV_USE_NANOSLEEP
# if _POSIX_C_SOURCE >= 199309L
# define EV_USE_NANOSLEEP EV_FEATURE_OS
# else
# define EV_USE_NANOSLEEP 0
# endif
#endif
#ifndef EV_USE_SELECT
# define EV_USE_SELECT EV_FEATURE_BACKENDS
#endif
#ifndef EV_USE_POLL
# ifdef _WIN32
# define EV_USE_POLL 0
# else
# define EV_USE_POLL EV_FEATURE_BACKENDS
# endif
#endif
#ifndef EV_USE_EPOLL
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
# define EV_USE_EPOLL EV_FEATURE_BACKENDS
# else
# define EV_USE_EPOLL 0
# endif
#endif
#ifndef EV_USE_KQUEUE
# define EV_USE_KQUEUE 0
#endif
#ifndef EV_USE_PORT
# define EV_USE_PORT 0
#endif
#ifndef EV_USE_INOTIFY
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
# define EV_USE_INOTIFY EV_FEATURE_OS
# else
# define EV_USE_INOTIFY 0
# endif
#endif
#ifndef EV_PID_HASHSIZE
# define EV_PID_HASHSIZE EV_FEATURE_DATA ? 16 : 1
#endif
#ifndef EV_INOTIFY_HASHSIZE
# define EV_INOTIFY_HASHSIZE EV_FEATURE_DATA ? 16 : 1
#endif
#ifndef EV_USE_EVENTFD
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
# define EV_USE_EVENTFD EV_FEATURE_OS
# else
# define EV_USE_EVENTFD 0
# endif
#endif
#ifndef EV_USE_SIGNALFD
# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
# define EV_USE_SIGNALFD EV_FEATURE_OS
# else
# define EV_USE_SIGNALFD 0
# endif
#endif
#if 0 /* debugging */
# define EV_VERIFY 3
# define EV_USE_4HEAP 1
# define EV_HEAP_CACHE_AT 1
#endif
#ifndef EV_VERIFY
# define EV_VERIFY (EV_FEATURE_API ? 1 : 0)
#endif
#ifndef EV_USE_4HEAP
# define EV_USE_4HEAP EV_FEATURE_DATA
#endif
#ifndef EV_HEAP_CACHE_AT
# define EV_HEAP_CACHE_AT EV_FEATURE_DATA
#endif
/* on linux, we can use a (slow) syscall to avoid a dependency on pthread, */
/* which makes programs even slower. might work on other unices, too. */
#if EV_USE_CLOCK_SYSCALL
# include <syscall.h>
# ifdef SYS_clock_gettime
# define clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
# undef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 1
# else
# undef EV_USE_CLOCK_SYSCALL
# define EV_USE_CLOCK_SYSCALL 0
# endif
#endif
/* this block fixes any misconfiguration where we know we run into trouble otherwise */
#ifdef _AIX
/* AIX has a completely broken poll.h header */
# undef EV_USE_POLL
# define EV_USE_POLL 0
#endif
#ifndef CLOCK_MONOTONIC
# undef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 0
#endif
#ifndef CLOCK_REALTIME
# undef EV_USE_REALTIME
# define EV_USE_REALTIME 0
#endif
#if !EV_STAT_ENABLE
# undef EV_USE_INOTIFY
# define EV_USE_INOTIFY 0
#endif
#if !EV_USE_NANOSLEEP
/* hp-ux has it in sys/time.h, which we unconditionally include above */
# if !defined(_WIN32) && !defined(__hpux)
# include <sys/select.h>
# endif
#endif
#if EV_USE_INOTIFY
# include <sys/statfs.h>
# include <sys/inotify.h>
/* some very old inotify.h headers don't have IN_DONT_FOLLOW */
# ifndef IN_DONT_FOLLOW
# undef EV_USE_INOTIFY
# define EV_USE_INOTIFY 0
# endif
#endif
#if EV_SELECT_IS_WINSOCKET
# include <winsock.h>
#endif
#if EV_USE_EVENTFD
/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
# include <stdint.h>
# ifndef EFD_NONBLOCK
# define EFD_NONBLOCK O_NONBLOCK
# endif
# ifndef EFD_CLOEXEC
# ifdef O_CLOEXEC
# define EFD_CLOEXEC O_CLOEXEC
# else
# define EFD_CLOEXEC 02000000
# endif
# endif
EV_CPP(extern "C") int (eventfd) (unsigned int initval, int flags);
#endif
#if EV_USE_SIGNALFD
/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
# include <stdint.h>
# ifndef SFD_NONBLOCK
# define SFD_NONBLOCK O_NONBLOCK
# endif
# ifndef SFD_CLOEXEC
# ifdef O_CLOEXEC
# define SFD_CLOEXEC O_CLOEXEC
# else
# define SFD_CLOEXEC 02000000
# endif
# endif
EV_CPP (extern "C") int signalfd (int fd, const sigset_t *mask, int flags);
struct signalfd_siginfo
{
uint32_t ssi_signo;
char pad[128 - sizeof (uint32_t)];
};
#endif
/**/
#if EV_VERIFY >= 3
# define EV_FREQUENT_CHECK ev_verify (EV_A)
#else
# define EV_FREQUENT_CHECK do { } while (0)
#endif
/*
* This is used to avoid floating point rounding problems.
* It is added to ev_rt_now when scheduling periodics
* to ensure progress, time-wise, even when rounding
* errors are against us.
* This value is good at least till the year 4000.
* Better solutions welcome.
*/
#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
#define EV_TV_SET(tv,t) do { tv.tv_sec = (long)t; tv.tv_usec = (long)((t - tv.tv_sec) * 1e6); } while (0)
#define EV_TS_SET(ts,t) do { ts.tv_sec = (long)t; ts.tv_nsec = (long)((t - ts.tv_sec) * 1e9); } while (0)
#if __GNUC__ >= 4
# define expect(expr,value) __builtin_expect ((expr),(value))
# define noinline __attribute__ ((noinline))
#else
# define expect(expr,value) (expr)
# define noinline
# if __STDC_VERSION__ < 199901L && __GNUC__ < 2
# define inline
# endif
#endif
#define expect_false(expr) expect ((expr) != 0, 0)
#define expect_true(expr) expect ((expr) != 0, 1)
#define inline_size static inline
#if EV_FEATURE_CODE
# define inline_speed static inline
#else
# define inline_speed static noinline
#endif
#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
#if EV_MINPRI == EV_MAXPRI
# define ABSPRI(w) (((W)w), 0)
#else
# define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
#endif
#define EMPTY /* required for microsofts broken pseudo-c compiler */
#define EMPTY2(a,b) /* used to suppress some warnings */
typedef ev_watcher *W;
typedef ev_watcher_list *WL;
typedef ev_watcher_time *WT;
#define ev_active(w) ((W)(w))->active
#define ev_at(w) ((WT)(w))->at
#if EV_USE_REALTIME
/* sig_atomic_t is used to avoid per-thread variables or locking but still */
/* giving it a reasonably high chance of working on typical architectures */
static EV_ATOMIC_T have_realtime; /* did clock_gettime (CLOCK_REALTIME) work? */
#endif
#if EV_USE_MONOTONIC
static EV_ATOMIC_T have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
#endif
#ifndef EV_FD_TO_WIN32_HANDLE
# define EV_FD_TO_WIN32_HANDLE(fd) _get_osfhandle (fd)
#endif
#ifndef EV_WIN32_HANDLE_TO_FD
# define EV_WIN32_HANDLE_TO_FD(handle) _open_osfhandle (handle, 0)
#endif
#ifndef EV_WIN32_CLOSE_FD
# define EV_WIN32_CLOSE_FD(fd) close (fd)
#endif
#ifdef _WIN32
# include "ev_win32.c"
#endif
/*****************************************************************************/
#ifdef __linux
# include <sys/utsname.h>
#endif
static unsigned int noinline
ev_linux_version (void)
{
#ifdef __linux
unsigned int v = 0;
struct utsname buf;
int i;
char *p = buf.release;
if (uname (&buf))
return 0;
for (i = 3+1; --i; )
{
unsigned int c = 0;
for (;;)
{
if (*p >= '0' && *p <= '9')
c = c * 10 + *p++ - '0';
else
{
p += *p == '.';
break;
}
}
v = (v << 8) | c;
}
return v;
#else
return 0;
#endif
}
/*****************************************************************************/
#if EV_AVOID_STDIO
static void noinline
ev_printerr (const char *msg)
{
write (STDERR_FILENO, msg, strlen (msg));
}
#endif
static void (*syserr_cb)(const char *msg);
void
ev_set_syserr_cb (void (*cb)(const char *msg))
{
syserr_cb = cb;
}
static void noinline
ev_syserr (const char *msg)
{
if (!msg)
msg = "(libev) system error";
if (syserr_cb)
syserr_cb (msg);
else
{
#if EV_AVOID_STDIO
ev_printerr (msg);
ev_printerr (": ");
ev_printerr (strerror (errno));
ev_printerr ("\n");
#else
perror (msg);
#endif
abort ();
}
}
static void *
ev_realloc_emul (void *ptr, long size)
{
/* some systems, notably openbsd and darwin, fail to properly
* implement realloc (x, 0) (as required by both ansi c-89 and
* the single unix specification, so work around them here.
*/
if (size)
return realloc (ptr, size);
free (ptr);
return 0;
}
static void *(*alloc)(void *ptr, long size) = ev_realloc_emul;
void
ev_set_allocator (void *(*cb)(void *ptr, long size))
{
alloc = cb;
}
inline_speed void *
ev_realloc (void *ptr, long size)
{
ptr = alloc (ptr, size);
if (!ptr && size)
{
#if EV_AVOID_STDIO
ev_printerr ("(libev) memory allocation failed, aborting.\n");
#else
fprintf (stderr, "(libev) cannot allocate %ld bytes, aborting.", size);
#endif
abort ();
}
return ptr;
}
#define ev_malloc(size) ev_realloc (0, (size))
#define ev_free(ptr) ev_realloc ((ptr), 0)
/*****************************************************************************/
/* set in reify when reification needed */
#define EV_ANFD_REIFY 1
/* file descriptor info structure */
typedef struct
{
WL head;
unsigned char events; /* the events watched for */
unsigned char reify; /* flag set when this ANFD needs reification (EV_ANFD_REIFY, EV__IOFDSET) */
unsigned char emask; /* the epoll backend stores the actual kernel mask in here */
unsigned char unused;
#if EV_USE_EPOLL
unsigned int egen; /* generation counter to counter epoll bugs */
#endif
#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
SOCKET handle;
#endif
#if EV_USE_IOCP
OVERLAPPED or, ow;
#endif
} ANFD;
/* stores the pending event set for a given watcher */
typedef struct
{
W w;
int events; /* the pending event set for the given watcher */
} ANPENDING;
#if EV_USE_INOTIFY
/* hash table entry per inotify-id */
typedef struct
{
WL head;
} ANFS;
#endif
/* Heap Entry */
#if EV_HEAP_CACHE_AT
/* a heap element */
typedef struct {
ev_tstamp at;
WT w;
} ANHE;
#define ANHE_w(he) (he).w /* access watcher, read-write */
#define ANHE_at(he) (he).at /* access cached at, read-only */
#define ANHE_at_cache(he) (he).at = (he).w->at /* update at from watcher */
#else
/* a heap element */
typedef WT ANHE;
#define ANHE_w(he) (he)
#define ANHE_at(he) (he)->at
#define ANHE_at_cache(he)
#endif
#if EV_MULTIPLICITY
struct ev_loop
{
ev_tstamp ev_rt_now;
#define ev_rt_now ((loop)->ev_rt_now)
#define VAR(name,decl) decl;
#include "ev_vars.h"
#undef VAR
};
#include "ev_wrap.h"
static struct ev_loop default_loop_struct;
struct ev_loop *ev_default_loop_ptr;
#else
ev_tstamp ev_rt_now;
#define VAR(name,decl) static decl;
#include "ev_vars.h"
#undef VAR
static int ev_default_loop_ptr;
#endif
#if EV_FEATURE_API
# define EV_RELEASE_CB if (expect_false (release_cb)) release_cb (EV_A)
# define EV_ACQUIRE_CB if (expect_false (acquire_cb)) acquire_cb (EV_A)
# define EV_INVOKE_PENDING invoke_cb (EV_A)
#else
# define EV_RELEASE_CB (void)0
# define EV_ACQUIRE_CB (void)0
# define EV_INVOKE_PENDING ev_invoke_pending (EV_A)
#endif
#define EVBREAK_RECURSE 0x80
/*****************************************************************************/
#ifndef EV_HAVE_EV_TIME
ev_tstamp
ev_time (void)
{
#if EV_USE_REALTIME
if (expect_true (have_realtime))
{
struct timespec ts;
clock_gettime (CLOCK_REALTIME, &ts);
return ts.tv_sec + ts.tv_nsec * 1e-9;
}
#endif
struct timeval tv;
gettimeofday (&tv, 0);
return tv.tv_sec + tv.tv_usec * 1e-6;
}
#endif
inline_size ev_tstamp
get_clock (void)
{
#if EV_USE_MONOTONIC
if (expect_true (have_monotonic))
{
struct timespec ts;
clock_gettime (CLOCK_MONOTONIC, &ts);
return ts.tv_sec + ts.tv_nsec * 1e-9;
}
#endif
return ev_time ();
}
#if EV_MULTIPLICITY
ev_tstamp
ev_now (EV_P)
{
return ev_rt_now;
}
#endif
void
ev_sleep (ev_tstamp delay)
{
if (delay > 0.)
{
#if EV_USE_NANOSLEEP
struct timespec ts;
EV_TS_SET (ts, delay);
nanosleep (&ts, 0);
#elif defined(_WIN32)
Sleep ((unsigned long)(delay * 1e3));
#else
struct timeval tv;
/* here we rely on sys/time.h + sys/types.h + unistd.h providing select */
/* something not guaranteed by newer posix versions, but guaranteed */
/* by older ones */
EV_TV_SET (tv, delay);
select (0, 0, 0, 0, &tv);
#endif
}
}
inline_speed int
ev_timeout_to_ms (ev_tstamp timeout)
{
int ms = timeout * 1000. + .999999;
return expect_true (ms) ? ms : timeout < 1e-6 ? 0 : 1;
}
/*****************************************************************************/
#define MALLOC_ROUND 4096 /* prefer to allocate in chunks of this size, must be 2**n and >> 4 longs */
/* find a suitable new size for the given array, */
/* hopefully by rounding to a nice-to-malloc size */
inline_size int
array_nextsize (int elem, int cur, int cnt)
{
int ncur = cur + 1;
do
ncur <<= 1;
while (cnt > ncur);
/* if size is large, round to MALLOC_ROUND - 4 * longs to accomodate malloc overhead */
if (elem * ncur > MALLOC_ROUND - sizeof (void *) * 4)
{
ncur *= elem;
ncur = (ncur + elem + (MALLOC_ROUND - 1) + sizeof (void *) * 4) & ~(MALLOC_ROUND - 1);
ncur = ncur - sizeof (void *) * 4;
ncur /= elem;
}
return ncur;
}
static noinline void *
array_realloc (int elem, void *base, int *cur, int cnt)
{
*cur = array_nextsize (elem, *cur, cnt);
return ev_realloc (base, elem * *cur);
}
#define array_init_zero(base,count) \
memset ((void *)(base), 0, sizeof (*(base)) * (count))
#define array_needsize(type,base,cur,cnt,init) \
if (expect_false ((cnt) > (cur))) \
{ \
int ocur_ = (cur); \
(base) = (type *)array_realloc \
(sizeof (type), (base), &(cur), (cnt)); \
init ((base) + (ocur_), (cur) - ocur_); \
}
#if 0
#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*/\
}
#endif
#define array_free(stem, idx) \
ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0; stem ## s idx = 0
/*****************************************************************************/
/* dummy callback for pending events */
static void noinline
pendingcb (EV_P_ ev_prepare *w, int revents)
{
}
void noinline
ev_feed_event (EV_P_ void *w, int revents)
{
W w_ = (W)w;
int pri = ABSPRI (w_);
if (expect_false (w_->pending))
pendings [pri][w_->pending - 1].events |= revents;
else
{
w_->pending = ++pendingcnt [pri];
array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
pendings [pri][w_->pending - 1].w = w_;
pendings [pri][w_->pending - 1].events = revents;
}
}
inline_speed void
feed_reverse (EV_P_ W w)
{
array_needsize (W, rfeeds, rfeedmax, rfeedcnt + 1, EMPTY2);
rfeeds [rfeedcnt++] = w;
}
inline_size void
feed_reverse_done (EV_P_ int revents)
{
do
ev_feed_event (EV_A_ rfeeds [--rfeedcnt], revents);
while (rfeedcnt);
}
inline_speed void
queue_events (EV_P_ W *events, int eventcnt, int type)
{
int i;
for (i = 0; i < eventcnt; ++i)
ev_feed_event (EV_A_ events [i], type);
}
/*****************************************************************************/
inline_speed void
fd_event_nocheck (EV_P_ int fd, int revents)
{
ANFD *anfd = anfds + fd;
ev_io *w;
for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
{
int ev = w->events & revents;
if (ev)
ev_feed_event (EV_A_ (W)w, ev);
}
}
/* do not submit kernel events for fds that have reify set */
/* because that means they changed while we were polling for new events */
inline_speed void
fd_event (EV_P_ int fd, int revents)
{
ANFD *anfd = anfds + fd;
if (expect_true (!anfd->reify))
fd_event_nocheck (EV_A_ fd, revents);
}
void
ev_feed_fd_event (EV_P_ int fd, int revents)
{
if (fd >= 0 && fd < anfdmax)
fd_event_nocheck (EV_A_ fd, revents);
}
/* make sure the external fd watch events are in-sync */
/* with the kernel/libev internal state */
inline_size void
fd_reify (EV_P)
{
int i;
#if EV_SELECT_IS_WINSOCKET || EV_USE_IOCP
for (i = 0; i < fdchangecnt; ++i)
{
int fd = fdchanges [i];
ANFD *anfd = anfds + fd;
if (anfd->reify & EV__IOFDSET)
{
SOCKET handle = EV_FD_TO_WIN32_HANDLE (fd);
if (handle != anfd->handle)
{
unsigned long arg;
assert (("libev: only socket fds supported in this configuration", ioctlsocket (handle, FIONREAD, &arg) == 0));
/* handle changed, but fd didn't - we need to do it in two steps */
backend_modify (EV_A_ fd, anfd->events, 0);
anfd->events = 0;
anfd->handle = handle;
}
}
}
#endif
for (i = 0; i < fdchangecnt; ++i)