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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38 | # define IOM_CHECK 0 |
38 | # define IOM_CHECK 0 |
39 | #endif |
39 | #endif |
40 | #ifndef IOM_IDLE |
40 | #ifndef IOM_IDLE |
41 | # define IOM_IDLE 0 |
41 | # define IOM_IDLE 0 |
42 | #endif |
42 | #endif |
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43 | #ifndef IOM_SIG |
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44 | # define IOM_SIG 0 |
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45 | #endif |
43 | |
46 | |
44 | typedef double tstamp; |
47 | typedef double tstamp; |
45 | extern tstamp NOW; |
48 | extern tstamp NOW; |
46 | |
49 | |
47 | struct watcher; |
50 | struct watcher; |
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55 | struct check_watcher; |
58 | struct check_watcher; |
56 | #endif |
59 | #endif |
57 | #if IOM_IDLE |
60 | #if IOM_IDLE |
58 | struct idle_watcher; |
61 | struct idle_watcher; |
59 | #endif |
62 | #endif |
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63 | #if IOM_SIG |
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64 | struct sig_watcher; |
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65 | #endif |
60 | |
66 | |
61 | template<class watcher> |
67 | template<class watcher> |
62 | struct io_manager_vec : protected vector<watcher *> { |
68 | struct io_manager_vec : vector<watcher *> { |
63 | friend class io_manager; |
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64 | protected: |
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65 | void erase_unordered (unsigned int pos) |
69 | void erase_unordered (unsigned int pos) |
66 | { |
70 | { |
67 | watcher *w = (*this)[size () - 1]; |
71 | watcher *w = (*this)[this->size () - 1]; |
68 | pop_back (); |
72 | this->pop_back (); |
69 | |
73 | |
70 | if (size ()) |
74 | if (!this->empty ()) |
71 | if ((*this)[pos] = w) |
75 | if (((*this)[pos] = w)) // '=' is correct! |
72 | w->active = pos + 1; |
76 | w->active = pos + 1; |
73 | } |
77 | } |
74 | }; |
78 | }; |
75 | |
79 | |
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80 | // only used as a namespace, and for initialisation purposes |
76 | class io_manager { |
81 | class io_manager { |
77 | #if IOM_IO |
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78 | io_manager_vec<io_watcher> iow; |
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79 | #endif |
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80 | #if IOM_CHECK |
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81 | io_manager_vec<check_watcher> cw; |
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82 | #endif |
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83 | #if IOM_TIME |
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84 | io_manager_vec<time_watcher> tw; |
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85 | #endif |
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86 | #if IOM_IDLE |
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87 | io_manager_vec<idle_watcher> iw; |
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88 | #endif |
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89 | |
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90 | template<class watcher> |
82 | template<class watcher> |
91 | void reg (watcher *w, io_manager_vec<watcher> &queue); |
83 | static void reg (watcher &w, io_manager_vec<watcher> &queue); |
92 | |
84 | |
93 | template<class watcher> |
85 | template<class watcher> |
94 | void unreg (watcher *w, io_manager_vec<watcher> &queue); |
86 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
95 | |
87 | |
96 | 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 | |
97 | // register a watcher |
97 | // register a watcher |
98 | #if IOM_IO |
98 | #if IOM_IO |
99 | void reg (io_watcher *w); void unreg (io_watcher *w); |
99 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
100 | #endif |
100 | #endif |
101 | #if IOM_TIME |
101 | #if IOM_TIME |
102 | void reg (time_watcher *w); void unreg (time_watcher *w); |
102 | static void reg (time_watcher &w); static void unreg (time_watcher &w); |
103 | #endif |
103 | #endif |
104 | #if IOM_CHECK |
104 | #if IOM_CHECK |
105 | void reg (check_watcher *w); void unreg (check_watcher *w); |
105 | static void reg (check_watcher &w); static void unreg (check_watcher &w); |
106 | #endif |
106 | #endif |
107 | #if IOM_IDLE |
107 | #if IOM_IDLE |
108 | void reg (idle_watcher *w); void unreg (idle_watcher *w); |
108 | static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
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109 | #endif |
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110 | #if IOM_SIG |
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111 | static void reg (sig_watcher &w); static void unreg (sig_watcher &w); |
109 | #endif |
112 | #endif |
110 | |
113 | |
111 | void loop (); |
114 | static void loop (); |
112 | |
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113 | io_manager (); |
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114 | ~io_manager (); |
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115 | }; |
115 | }; |
116 | |
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117 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
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118 | |
116 | |
119 | struct watcher { |
117 | struct watcher { |
120 | int active; /* 0 == inactive, else index into respective vector */ |
118 | int active; /* 0 == inactive, else index into respective vector */ |
121 | |
119 | |
122 | watcher() : active(0) { } |
120 | watcher () : active (0) { } |
123 | }; |
121 | }; |
124 | |
122 | |
125 | #if IOM_IO |
123 | #if IOM_IO |
126 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
124 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
127 | |
125 | |
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130 | short events; |
128 | short events; |
131 | |
129 | |
132 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
130 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
133 | |
131 | |
134 | void set (short events_) { set (fd, events_); } |
132 | void set (short events_) { set (fd, events_); } |
135 | void start () { iom.reg (this); } |
133 | void start () { io_manager::reg (*this); } |
136 | 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); } |
137 | void stop () { iom.unreg (this); } |
135 | void stop () { io_manager::unreg (*this); } |
138 | |
136 | |
139 | template<class O1, class O2> |
137 | template<class O1, class O2> |
140 | io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) |
138 | io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
141 | : callback2<void, io_watcher &, short>(object,method) |
139 | : callback2<void, io_watcher &, short> (object,method) |
142 | { } |
140 | { } |
143 | ~io_watcher () { stop (); } |
141 | ~io_watcher () { stop (); } |
144 | }; |
142 | }; |
145 | #endif |
143 | #endif |
146 | |
144 | |
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149 | tstamp at; |
147 | tstamp at; |
150 | |
148 | |
151 | void trigger (); |
149 | void trigger (); |
152 | |
150 | |
153 | void set (tstamp when) { at = when; } |
151 | void set (tstamp when) { at = when; } |
154 | void operator ()() { trigger (); } |
152 | void operator () () { trigger (); } |
155 | void start () { iom.reg (this); } |
153 | void start () { io_manager::reg (*this); } |
156 | void start (tstamp when) { set (when); iom.reg (this); } |
154 | void start (tstamp when) { set (when); io_manager::reg (*this); } |
157 | void stop () { iom.unreg (this); } |
155 | void stop () { io_manager::unreg (*this); } |
158 | |
156 | |
159 | template<class O1, class O2> |
157 | template<class O1, class O2> |
160 | time_watcher (O1 *object, void (O2::*method)(time_watcher &)) |
158 | time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
161 | : callback1<void, time_watcher &>(object,method) |
159 | : callback1<void, time_watcher &> (object,method), at (0) |
162 | { } |
160 | { } |
163 | ~time_watcher () { stop (); } |
161 | ~time_watcher () { stop (); } |
164 | }; |
162 | }; |
165 | #endif |
163 | #endif |
166 | |
164 | |
167 | #if IOM_CHECK |
165 | #if IOM_CHECK |
168 | // run before checking for new events |
166 | // run before checking for new events |
169 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
167 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
170 | void start () { iom.reg (this); } |
168 | void start () { io_manager::reg (*this); } |
171 | void stop () { iom.unreg (this); } |
169 | void stop () { io_manager::unreg (*this); } |
172 | |
170 | |
173 | template<class O1, class O2> |
171 | template<class O1, class O2> |
174 | check_watcher (O1 *object, void (O2::*method)(check_watcher &)) |
172 | check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
175 | : callback1<void, check_watcher &>(object,method) |
173 | : callback1<void, check_watcher &> (object,method) |
176 | { } |
174 | { } |
177 | ~check_watcher () { stop (); } |
175 | ~check_watcher () { stop (); } |
178 | }; |
176 | }; |
179 | #endif |
177 | #endif |
180 | |
178 | |
181 | #if IOM_IDLE |
179 | #if IOM_IDLE |
182 | // run after checking for any i/o, but before waiting |
180 | // run after checking for any i/o, but before waiting |
183 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
181 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
184 | void start () { iom.reg (this); } |
182 | void start () { io_manager::reg (*this); } |
185 | void stop () { iom.unreg (this); } |
183 | void stop () { io_manager::unreg (*this); } |
186 | |
184 | |
187 | template<class O1, class O2> |
185 | template<class O1, class O2> |
188 | idle_watcher (O1 *object, void (O2::*method)(idle_watcher &)) |
186 | idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
189 | : callback1<void, idle_watcher &>(object,method) |
187 | : callback1<void, idle_watcher &> (object,method) |
190 | { } |
188 | { } |
191 | ~idle_watcher () { stop (); } |
189 | ~idle_watcher () { stop (); } |
192 | }; |
190 | }; |
193 | #endif |
191 | #endif |
194 | |
192 | |
195 | #endif |
193 | #if IOM_SIG |
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194 | struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
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195 | int signum; |
196 | |
196 | |
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197 | void start (int signum); |
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198 | void stop () { io_manager::unreg (*this); } |
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199 | |
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200 | template<class O1, class O2> |
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201 | sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
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202 | : callback1<void, sig_watcher &> (object,method), signum (-1) |
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203 | { } |
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204 | ~sig_watcher () { stop (); } |
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205 | }; |
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206 | #endif |
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207 | |
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208 | #endif |
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209 | |