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 |
… | |
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12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
13 | GNU General Public License for more details. |
14 | |
14 | |
15 | You should have received a copy of the GNU General Public License |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
16 | along with this program; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | */ |
18 | */ |
19 | |
19 | |
20 | #ifndef IOM_H__ |
20 | #ifndef IOM_H__ |
21 | #define IOM_H__ |
21 | #define IOM_H__ |
22 | |
22 | |
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64 | struct sig_watcher; |
64 | struct sig_watcher; |
65 | #endif |
65 | #endif |
66 | |
66 | |
67 | template<class watcher> |
67 | template<class watcher> |
68 | struct io_manager_vec : vector<watcher *> { |
68 | struct io_manager_vec : vector<watcher *> { |
69 | #if IOM_CHECK |
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70 | bool activity; |
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71 | #endif |
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72 | |
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73 | void erase_unordered (unsigned int pos) |
69 | void erase_unordered (unsigned int pos) |
74 | { |
70 | { |
75 | watcher *w = (*this)[size () - 1]; |
71 | watcher *w = (*this)[this->size () - 1]; |
76 | pop_back (); |
72 | this->pop_back (); |
77 | |
73 | |
78 | if (size ()) |
74 | if (!this->empty ()) |
79 | if ((*this)[pos] = w) |
75 | if (((*this)[pos] = w)) // '=' is correct! |
80 | w->active = pos + 1; |
76 | w->active = pos + 1; |
81 | } |
77 | } |
82 | }; |
78 | }; |
83 | |
79 | |
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80 | // only used as a namespace, and for initialisation purposes |
84 | class io_manager { |
81 | class io_manager { |
85 | #if IOM_IO |
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86 | io_manager_vec<io_watcher> iow; |
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87 | #endif |
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88 | #if IOM_CHECK |
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89 | io_manager_vec<check_watcher> cw; |
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90 | #endif |
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91 | #if IOM_TIME |
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92 | io_manager_vec<time_watcher> tw; |
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93 | #endif |
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94 | #if IOM_IDLE |
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95 | io_manager_vec<idle_watcher> iw; |
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96 | #endif |
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97 | #if IOM_SIG |
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98 | typedef io_manager_vec<sig_watcher> sig_vec; |
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99 | vector<sig_vec *> sw; |
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100 | static void sighandler (int signum); |
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101 | #endif |
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102 | |
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103 | template<class watcher> |
82 | template<class watcher> |
104 | void reg (watcher *w, io_manager_vec<watcher> &queue); |
83 | static void reg (watcher &w, io_manager_vec<watcher> &queue); |
105 | |
84 | |
106 | template<class watcher> |
85 | template<class watcher> |
107 | void unreg (watcher *w, io_manager_vec<watcher> &queue); |
86 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
108 | |
87 | |
109 | public: |
88 | public: |
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89 | #if IOM_TIME |
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90 | // fetch time only |
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91 | static tstamp now (); |
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92 | |
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93 | // set NOW |
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94 | static void set_now (); |
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95 | #endif |
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96 | |
110 | // register a watcher |
97 | // register a watcher |
111 | #if IOM_IO |
98 | #if IOM_IO |
112 | void reg (io_watcher *w); void unreg (io_watcher *w); |
99 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
113 | #endif |
100 | #endif |
114 | #if IOM_TIME |
101 | #if IOM_TIME |
115 | void reg (time_watcher *w); void unreg (time_watcher *w); |
102 | static void reg (time_watcher &w); static void unreg (time_watcher &w); |
116 | #endif |
103 | #endif |
117 | #if IOM_CHECK |
104 | #if IOM_CHECK |
118 | void reg (check_watcher *w); void unreg (check_watcher *w); |
105 | static void reg (check_watcher &w); static void unreg (check_watcher &w); |
119 | #endif |
106 | #endif |
120 | #if IOM_IDLE |
107 | #if IOM_IDLE |
121 | void reg (idle_watcher *w); void unreg (idle_watcher *w); |
108 | static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
122 | #endif |
109 | #endif |
123 | #if IOM_SIG |
110 | #if IOM_SIG |
124 | void reg (sig_watcher *w); void unreg (sig_watcher *w); |
111 | static void reg (sig_watcher &w); static void unreg (sig_watcher &w); |
125 | #endif |
112 | #endif |
126 | |
113 | |
127 | void loop (); |
114 | static void loop (); |
128 | |
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129 | io_manager (); |
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130 | ~io_manager (); |
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131 | }; |
115 | }; |
132 | |
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133 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
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134 | |
116 | |
135 | struct watcher { |
117 | struct watcher { |
136 | int active; /* 0 == inactive, else index into respective vector */ |
118 | int active; /* 0 == inactive, else index into respective vector */ |
137 | |
119 | |
138 | watcher () : active (0) { } |
120 | watcher () : active (0) { } |
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146 | short events; |
128 | short events; |
147 | |
129 | |
148 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
130 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
149 | |
131 | |
150 | void set (short events_) { set (fd, events_); } |
132 | void set (short events_) { set (fd, events_); } |
151 | void start () { iom.reg (this); } |
133 | void start () { io_manager::reg (*this); } |
152 | void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); } |
134 | void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); } |
153 | void stop () { iom.unreg (this); } |
135 | void stop () { io_manager::unreg (*this); } |
154 | |
136 | |
155 | template<class O1, class O2> |
137 | template<class O1, class O2> |
156 | io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
138 | io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
157 | : callback2<void, io_watcher &, short> (object,method) |
139 | : callback2<void, io_watcher &, short> (object,method) |
158 | { } |
140 | { } |
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166 | |
148 | |
167 | void trigger (); |
149 | void trigger (); |
168 | |
150 | |
169 | void set (tstamp when) { at = when; } |
151 | void set (tstamp when) { at = when; } |
170 | void operator () () { trigger (); } |
152 | void operator () () { trigger (); } |
171 | void start () { iom.reg (this); } |
153 | void start () { io_manager::reg (*this); } |
172 | void start (tstamp when) { set (when); iom.reg (this); } |
154 | void start (tstamp when) { set (when); io_manager::reg (*this); } |
173 | void stop () { iom.unreg (this); } |
155 | void stop () { io_manager::unreg (*this); } |
174 | |
156 | |
175 | template<class O1, class O2> |
157 | template<class O1, class O2> |
176 | time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
158 | time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
177 | : callback1<void, time_watcher &> (object,method), at (0) |
159 | : callback1<void, time_watcher &> (object,method), at (0) |
178 | { } |
160 | { } |
… | |
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181 | #endif |
163 | #endif |
182 | |
164 | |
183 | #if IOM_CHECK |
165 | #if IOM_CHECK |
184 | // run before checking for new events |
166 | // run before checking for new events |
185 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
167 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
186 | void start () { iom.reg (this); } |
168 | void start () { io_manager::reg (*this); } |
187 | void stop () { iom.unreg (this); } |
169 | void stop () { io_manager::unreg (*this); } |
188 | |
170 | |
189 | template<class O1, class O2> |
171 | template<class O1, class O2> |
190 | check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
172 | check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
191 | : callback1<void, check_watcher &> (object,method) |
173 | : callback1<void, check_watcher &> (object,method) |
192 | { } |
174 | { } |
… | |
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195 | #endif |
177 | #endif |
196 | |
178 | |
197 | #if IOM_IDLE |
179 | #if IOM_IDLE |
198 | // run after checking for any i/o, but before waiting |
180 | // run after checking for any i/o, but before waiting |
199 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
181 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
200 | void start () { iom.reg (this); } |
182 | void start () { io_manager::reg (*this); } |
201 | void stop () { iom.unreg (this); } |
183 | void stop () { io_manager::unreg (*this); } |
202 | |
184 | |
203 | template<class O1, class O2> |
185 | template<class O1, class O2> |
204 | idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
186 | idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
205 | : callback1<void, idle_watcher &> (object,method) |
187 | : callback1<void, idle_watcher &> (object,method) |
206 | { } |
188 | { } |
… | |
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211 | #if IOM_SIG |
193 | #if IOM_SIG |
212 | struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
194 | struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
213 | int signum; |
195 | int signum; |
214 | |
196 | |
215 | void start (int signum); |
197 | void start (int signum); |
216 | void stop () { iom.unreg (this); } |
198 | void stop () { io_manager::unreg (*this); } |
217 | |
199 | |
218 | template<class O1, class O2> |
200 | template<class O1, class O2> |
219 | sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
201 | sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
220 | : callback1<void, sig_watcher &> (object,method), signum (-1) |
202 | : callback1<void, sig_watcher &> (object,method), signum (-1) |
221 | { } |
203 | { } |