1 | /* |
1 | /* |
2 | iom.h -- generic I/O multiplexor |
2 | iom.h -- generic I/O multiplexer |
3 | Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com> |
4 | |
4 | |
5 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
6 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
… | |
… | |
41 | # define IOM_IDLE 0 |
41 | # define IOM_IDLE 0 |
42 | #endif |
42 | #endif |
43 | #ifndef IOM_SIG |
43 | #ifndef IOM_SIG |
44 | # define IOM_SIG 0 |
44 | # define IOM_SIG 0 |
45 | #endif |
45 | #endif |
|
|
46 | #ifndef IOM_ACCURACY |
|
|
47 | # define IOM_ACCURACY 0.001 // start timers at most this much earlier (can be 0) |
|
|
48 | #endif |
46 | |
49 | |
47 | typedef double tstamp; |
50 | typedef double tstamp; |
48 | extern tstamp NOW; |
51 | extern tstamp NOW; |
49 | |
52 | |
50 | struct watcher; |
53 | struct watcher; |
… | |
… | |
64 | struct sig_watcher; |
67 | struct sig_watcher; |
65 | #endif |
68 | #endif |
66 | |
69 | |
67 | template<class watcher> |
70 | template<class watcher> |
68 | struct io_manager_vec : vector<watcher *> { |
71 | struct io_manager_vec : vector<watcher *> { |
69 | #if IOM_CHECK |
|
|
70 | bool activity; |
|
|
71 | #endif |
|
|
72 | |
|
|
73 | void erase_unordered (unsigned int pos) |
72 | void erase_unordered (unsigned int pos) |
74 | { |
73 | { |
75 | watcher *w = (*this)[this->size () - 1]; |
74 | watcher *w = (*this)[this->size () - 1]; |
76 | this->pop_back (); |
75 | this->pop_back (); |
77 | |
76 | |
78 | if (this->size ()) |
77 | if (!this->empty ()) |
79 | if ((*this)[pos] = w) |
78 | if (((*this)[pos] = w)) // '=' is correct! |
80 | w->active = pos + 1; |
79 | w->active = pos + 1; |
81 | } |
80 | } |
82 | }; |
81 | }; |
83 | |
82 | |
|
|
83 | // only used as a namespace, and for initialisation purposes |
84 | class io_manager { |
84 | class io_manager { |
85 | #if IOM_IO |
|
|
86 | io_manager_vec<io_watcher> iow; |
|
|
87 | #endif |
|
|
88 | #if IOM_CHECK |
|
|
89 | io_manager_vec<check_watcher> cw; |
|
|
90 | #endif |
|
|
91 | #if IOM_TIME |
|
|
92 | io_manager_vec<time_watcher> tw; |
|
|
93 | #endif |
|
|
94 | #if IOM_IDLE |
|
|
95 | io_manager_vec<idle_watcher> iw; |
|
|
96 | #endif |
|
|
97 | #if IOM_SIG |
|
|
98 | typedef io_manager_vec<sig_watcher> sig_vec; |
|
|
99 | vector<sig_vec *> sw; |
|
|
100 | static void sighandler (int signum); |
|
|
101 | #endif |
|
|
102 | |
|
|
103 | template<class watcher> |
85 | template<class watcher> |
104 | void reg (watcher *w, io_manager_vec<watcher> &queue); |
86 | static void reg (watcher &w, io_manager_vec<watcher> &queue); |
105 | |
87 | |
106 | template<class watcher> |
88 | template<class watcher> |
107 | void unreg (watcher *w, io_manager_vec<watcher> &queue); |
89 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
108 | |
90 | |
109 | public: |
91 | public: |
110 | // register a watcher |
92 | // register a watcher |
111 | #if IOM_IO |
93 | #if IOM_IO |
112 | void reg (io_watcher *w); void unreg (io_watcher *w); |
94 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
113 | #endif |
95 | #endif |
114 | #if IOM_TIME |
96 | #if IOM_TIME |
115 | void reg (time_watcher *w); void unreg (time_watcher *w); |
97 | static void reg (time_watcher &w); static void unreg (time_watcher &w); |
116 | #endif |
98 | #endif |
117 | #if IOM_CHECK |
99 | #if IOM_CHECK |
118 | void reg (check_watcher *w); void unreg (check_watcher *w); |
100 | static void reg (check_watcher &w); static void unreg (check_watcher &w); |
119 | #endif |
101 | #endif |
120 | #if IOM_IDLE |
102 | #if IOM_IDLE |
121 | void reg (idle_watcher *w); void unreg (idle_watcher *w); |
103 | static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
122 | #endif |
104 | #endif |
123 | #if IOM_SIG |
105 | #if IOM_SIG |
124 | void reg (sig_watcher *w); void unreg (sig_watcher *w); |
106 | static void reg (sig_watcher &w); static void unreg (sig_watcher &w); |
125 | #endif |
107 | #endif |
126 | |
108 | |
127 | void loop (); |
109 | static void loop (); |
128 | |
|
|
129 | io_manager (); |
|
|
130 | ~io_manager (); |
|
|
131 | }; |
110 | }; |
132 | |
|
|
133 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
|
|
134 | |
111 | |
135 | struct watcher { |
112 | struct watcher { |
136 | int active; /* 0 == inactive, else index into respective vector */ |
113 | int active; /* 0 == inactive, else index into respective vector */ |
137 | |
114 | |
138 | watcher () : active (0) { } |
115 | watcher () : active (0) { } |
… | |
… | |
146 | short events; |
123 | short events; |
147 | |
124 | |
148 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
125 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
149 | |
126 | |
150 | void set (short events_) { set (fd, events_); } |
127 | void set (short events_) { set (fd, events_); } |
151 | void start () { iom.reg (this); } |
128 | void start () { io_manager::reg (*this); } |
152 | void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); } |
129 | void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); } |
153 | void stop () { iom.unreg (this); } |
130 | void stop () { io_manager::unreg (*this); } |
154 | |
131 | |
155 | template<class O1, class O2> |
132 | template<class O1, class O2> |
156 | io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
133 | io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
157 | : callback2<void, io_watcher &, short> (object,method) |
134 | : callback2<void, io_watcher &, short> (object,method) |
158 | { } |
135 | { } |
… | |
… | |
166 | |
143 | |
167 | void trigger (); |
144 | void trigger (); |
168 | |
145 | |
169 | void set (tstamp when) { at = when; } |
146 | void set (tstamp when) { at = when; } |
170 | void operator () () { trigger (); } |
147 | void operator () () { trigger (); } |
171 | void start () { iom.reg (this); } |
148 | void start () { io_manager::reg (*this); } |
172 | void start (tstamp when) { set (when); iom.reg (this); } |
149 | void start (tstamp when) { set (when); io_manager::reg (*this); } |
173 | void stop () { iom.unreg (this); } |
150 | void stop () { io_manager::unreg (*this); } |
174 | |
151 | |
175 | template<class O1, class O2> |
152 | template<class O1, class O2> |
176 | time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
153 | time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
177 | : callback1<void, time_watcher &> (object,method), at (0) |
154 | : callback1<void, time_watcher &> (object,method), at (0) |
178 | { } |
155 | { } |
… | |
… | |
181 | #endif |
158 | #endif |
182 | |
159 | |
183 | #if IOM_CHECK |
160 | #if IOM_CHECK |
184 | // run before checking for new events |
161 | // run before checking for new events |
185 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
162 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
186 | void start () { iom.reg (this); } |
163 | void start () { io_manager::reg (*this); } |
187 | void stop () { iom.unreg (this); } |
164 | void stop () { io_manager::unreg (*this); } |
188 | |
165 | |
189 | template<class O1, class O2> |
166 | template<class O1, class O2> |
190 | check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
167 | check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
191 | : callback1<void, check_watcher &> (object,method) |
168 | : callback1<void, check_watcher &> (object,method) |
192 | { } |
169 | { } |
… | |
… | |
195 | #endif |
172 | #endif |
196 | |
173 | |
197 | #if IOM_IDLE |
174 | #if IOM_IDLE |
198 | // run after checking for any i/o, but before waiting |
175 | // run after checking for any i/o, but before waiting |
199 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
176 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
200 | void start () { iom.reg (this); } |
177 | void start () { io_manager::reg (*this); } |
201 | void stop () { iom.unreg (this); } |
178 | void stop () { io_manager::unreg (*this); } |
202 | |
179 | |
203 | template<class O1, class O2> |
180 | template<class O1, class O2> |
204 | idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
181 | idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
205 | : callback1<void, idle_watcher &> (object,method) |
182 | : callback1<void, idle_watcher &> (object,method) |
206 | { } |
183 | { } |
… | |
… | |
211 | #if IOM_SIG |
188 | #if IOM_SIG |
212 | struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
189 | struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
213 | int signum; |
190 | int signum; |
214 | |
191 | |
215 | void start (int signum); |
192 | void start (int signum); |
216 | void stop () { iom.unreg (this); } |
193 | void stop () { io_manager::unreg (*this); } |
217 | |
194 | |
218 | template<class O1, class O2> |
195 | template<class O1, class O2> |
219 | sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
196 | sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
220 | : callback1<void, sig_watcher &> (object,method), signum (-1) |
197 | : callback1<void, sig_watcher &> (object,method), signum (-1) |
221 | { } |
198 | { } |