| 1 |
/* |
| 2 |
iom.h -- generic I/O multiplexer |
| 3 |
Copyright (C) 2003, 2004 Marc Lehmann <gvpe@schmorp.de> |
| 4 |
|
| 5 |
This file is part of GVPE. |
| 6 |
|
| 7 |
GVPE is free software; you can redistribute it and/or modify |
| 8 |
it under the terms of the GNU General Public License as published by |
| 9 |
the Free Software Foundation; either version 2 of the License, or |
| 10 |
(at your option) any later version. |
| 11 |
|
| 12 |
This program is distributed in the hope that it will be useful, |
| 13 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 |
GNU General Public License for more details. |
| 16 |
|
| 17 |
You should have received a copy of the GNU General Public License |
| 18 |
along with gvpe; if not, write to the Free Software |
| 19 |
Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 |
*/ |
| 21 |
|
| 22 |
#ifndef IOM_H__ |
| 23 |
#define IOM_H__ |
| 24 |
|
| 25 |
// required: |
| 26 |
// - a vector template like simplevec or stl's vector |
| 27 |
// - defines for all watcher types required in your app |
| 28 |
// edit iom_conf.h as appropriate. |
| 29 |
#include "iom_conf.h" |
| 30 |
|
| 31 |
#include "callback.h" |
| 32 |
|
| 33 |
#ifndef IOM_IO |
| 34 |
# define IOM_IO 0 |
| 35 |
#endif |
| 36 |
#ifndef IOM_TIME |
| 37 |
# define IOM_TIME 0 |
| 38 |
#endif |
| 39 |
#ifndef IOM_CHECK |
| 40 |
# define IOM_CHECK 0 |
| 41 |
#endif |
| 42 |
#ifndef IOM_IDLE |
| 43 |
# define IOM_IDLE 0 |
| 44 |
#endif |
| 45 |
#ifndef IOM_SIG |
| 46 |
# define IOM_SIG 0 |
| 47 |
#endif |
| 48 |
|
| 49 |
typedef double tstamp; |
| 50 |
extern tstamp NOW; |
| 51 |
|
| 52 |
struct watcher; |
| 53 |
#if IOM_IO |
| 54 |
struct io_watcher; |
| 55 |
#endif |
| 56 |
#if IOM_TIME |
| 57 |
struct time_watcher; |
| 58 |
#endif |
| 59 |
#if IOM_CHECK |
| 60 |
struct check_watcher; |
| 61 |
#endif |
| 62 |
#if IOM_IDLE |
| 63 |
struct idle_watcher; |
| 64 |
#endif |
| 65 |
#if IOM_SIG |
| 66 |
struct sig_watcher; |
| 67 |
#endif |
| 68 |
|
| 69 |
template<class watcher> |
| 70 |
struct io_manager_vec : vector<watcher *> { |
| 71 |
void erase_unordered (unsigned int pos) |
| 72 |
{ |
| 73 |
watcher *w = (*this)[this->size () - 1]; |
| 74 |
this->pop_back (); |
| 75 |
|
| 76 |
if (!this->empty ()) |
| 77 |
if (((*this)[pos] = w)) // '=' is correct! |
| 78 |
w->active = pos + 1; |
| 79 |
} |
| 80 |
}; |
| 81 |
|
| 82 |
// only used as a namespace, and for initialisation purposes |
| 83 |
class io_manager { |
| 84 |
template<class watcher> |
| 85 |
static void reg (watcher &w, io_manager_vec<watcher> &queue); |
| 86 |
|
| 87 |
template<class watcher> |
| 88 |
static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
| 89 |
|
| 90 |
public: |
| 91 |
#if IOM_TIME |
| 92 |
// fetch time only |
| 93 |
static tstamp now (); |
| 94 |
|
| 95 |
// set NOW |
| 96 |
static void set_now (); |
| 97 |
#endif |
| 98 |
|
| 99 |
// register a watcher |
| 100 |
#if IOM_IO |
| 101 |
static void reg (io_watcher &w); static void unreg (io_watcher &w); |
| 102 |
#endif |
| 103 |
#if IOM_TIME |
| 104 |
static void reg (time_watcher &w); static void unreg (time_watcher &w); |
| 105 |
#endif |
| 106 |
#if IOM_CHECK |
| 107 |
static void reg (check_watcher &w); static void unreg (check_watcher &w); |
| 108 |
#endif |
| 109 |
#if IOM_IDLE |
| 110 |
static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
| 111 |
#endif |
| 112 |
#if IOM_SIG |
| 113 |
static void reg (sig_watcher &w); static void unreg (sig_watcher &w); |
| 114 |
#endif |
| 115 |
|
| 116 |
static void loop (); |
| 117 |
}; |
| 118 |
|
| 119 |
struct watcher { |
| 120 |
int active; /* 0 == inactive, else index into respective vector */ |
| 121 |
|
| 122 |
watcher () : active (0) { } |
| 123 |
}; |
| 124 |
|
| 125 |
#if IOM_IO |
| 126 |
enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
| 127 |
|
| 128 |
struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
| 129 |
int fd; |
| 130 |
short events; |
| 131 |
|
| 132 |
void set (int fd_, short events_) { fd = fd_; events = events_; } |
| 133 |
|
| 134 |
void set (short events_) { set (fd, events_); } |
| 135 |
void start () { io_manager::reg (*this); } |
| 136 |
void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); } |
| 137 |
void stop () { io_manager::unreg (*this); } |
| 138 |
|
| 139 |
template<class O1, class O2> |
| 140 |
io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
| 141 |
: callback2<void, io_watcher &, short> (object,method) |
| 142 |
{ } |
| 143 |
~io_watcher () { stop (); } |
| 144 |
}; |
| 145 |
#endif |
| 146 |
|
| 147 |
#if IOM_TIME |
| 148 |
struct time_watcher : watcher, callback1<void, time_watcher &> { |
| 149 |
tstamp at; |
| 150 |
|
| 151 |
void trigger (); |
| 152 |
|
| 153 |
void set (tstamp when) { at = when; } |
| 154 |
void operator () () { trigger (); } |
| 155 |
void start () { io_manager::reg (*this); } |
| 156 |
void start (tstamp when) { set (when); io_manager::reg (*this); } |
| 157 |
void stop () { io_manager::unreg (*this); } |
| 158 |
|
| 159 |
template<class O1, class O2> |
| 160 |
time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
| 161 |
: callback1<void, time_watcher &> (object,method), at (0) |
| 162 |
{ } |
| 163 |
~time_watcher () { stop (); } |
| 164 |
}; |
| 165 |
#endif |
| 166 |
|
| 167 |
#if IOM_CHECK |
| 168 |
// run before checking for new events |
| 169 |
struct check_watcher : watcher, callback1<void, check_watcher &> { |
| 170 |
void start () { io_manager::reg (*this); } |
| 171 |
void stop () { io_manager::unreg (*this); } |
| 172 |
|
| 173 |
template<class O1, class O2> |
| 174 |
check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
| 175 |
: callback1<void, check_watcher &> (object,method) |
| 176 |
{ } |
| 177 |
~check_watcher () { stop (); } |
| 178 |
}; |
| 179 |
#endif |
| 180 |
|
| 181 |
#if IOM_IDLE |
| 182 |
// run after checking for any i/o, but before waiting |
| 183 |
struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
| 184 |
void start () { io_manager::reg (*this); } |
| 185 |
void stop () { io_manager::unreg (*this); } |
| 186 |
|
| 187 |
template<class O1, class O2> |
| 188 |
idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
| 189 |
: callback1<void, idle_watcher &> (object,method) |
| 190 |
{ } |
| 191 |
~idle_watcher () { stop (); } |
| 192 |
}; |
| 193 |
#endif |
| 194 |
|
| 195 |
#if IOM_SIG |
| 196 |
struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
| 197 |
int signum; |
| 198 |
|
| 199 |
void start (int signum); |
| 200 |
void stop () { io_manager::unreg (*this); } |
| 201 |
|
| 202 |
template<class O1, class O2> |
| 203 |
sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
| 204 |
: callback1<void, sig_watcher &> (object,method), signum (-1) |
| 205 |
{ } |
| 206 |
~sig_watcher () { stop (); } |
| 207 |
}; |
| 208 |
#endif |
| 209 |
|
| 210 |
#endif |
| 211 |
|
