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 <gvpe@schmorp.de> |
4 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
8 | 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 |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #ifndef IOM_H__ |
22 | #ifndef IOM_H__ |
21 | #define IOM_H__ |
23 | #define IOM_H__ |
22 | |
24 | |
… | |
… | |
38 | # define IOM_CHECK 0 |
40 | # define IOM_CHECK 0 |
39 | #endif |
41 | #endif |
40 | #ifndef IOM_IDLE |
42 | #ifndef IOM_IDLE |
41 | # define IOM_IDLE 0 |
43 | # define IOM_IDLE 0 |
42 | #endif |
44 | #endif |
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45 | #ifndef IOM_SIG |
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46 | # define IOM_SIG 0 |
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47 | #endif |
43 | |
48 | |
44 | typedef double tstamp; |
49 | typedef double tstamp; |
45 | extern tstamp NOW; |
50 | extern tstamp NOW; |
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51 | |
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52 | // TSTAMP_MAX must still fit into a positive struct timeval |
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53 | #define TSTAMP_MAX (double)(1UL<<31) |
46 | |
54 | |
47 | struct watcher; |
55 | struct watcher; |
48 | #if IOM_IO |
56 | #if IOM_IO |
49 | struct io_watcher; |
57 | struct io_watcher; |
50 | #endif |
58 | #endif |
… | |
… | |
55 | struct check_watcher; |
63 | struct check_watcher; |
56 | #endif |
64 | #endif |
57 | #if IOM_IDLE |
65 | #if IOM_IDLE |
58 | struct idle_watcher; |
66 | struct idle_watcher; |
59 | #endif |
67 | #endif |
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68 | #if IOM_SIG |
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69 | struct sig_watcher; |
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70 | #endif |
60 | |
71 | |
61 | template<class watcher> |
72 | template<class watcher> |
62 | struct io_manager_vec : protected vector<watcher *> { |
73 | 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) |
74 | void erase_unordered (unsigned int pos) |
66 | { |
75 | { |
67 | watcher *w = (*this)[size () - 1]; |
76 | watcher *w = (*this)[this->size () - 1]; |
68 | pop_back (); |
77 | this->pop_back (); |
69 | |
78 | |
70 | if (size ()) |
79 | if (!this->empty ()) |
71 | if ((*this)[pos] = w) |
80 | if (((*this)[pos] = w)) // '=' is correct! |
72 | w->active = pos + 1; |
81 | w->active = pos + 1; |
73 | } |
82 | } |
74 | }; |
83 | }; |
75 | |
84 | |
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85 | // only used as a namespace, and for initialisation purposes |
76 | class io_manager { |
86 | 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> |
87 | template<class watcher> |
91 | void reg (watcher *w, io_manager_vec<watcher> &queue); |
88 | static void reg (watcher &w, io_manager_vec<watcher> &queue); |
92 | |
89 | |
93 | template<class watcher> |
90 | template<class watcher> |
94 | void unreg (watcher *w, io_manager_vec<watcher> &queue); |
91 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
95 | |
92 | |
96 | public: |
93 | public: |
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94 | #if IOM_TIME |
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95 | // fetch time only |
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96 | static tstamp now (); |
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97 | |
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98 | // set NOW |
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99 | static void set_now (); |
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100 | #endif |
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101 | |
97 | // register a watcher |
102 | // register a watcher |
98 | #if IOM_IO |
103 | #if IOM_IO |
99 | void reg (io_watcher *w); void unreg (io_watcher *w); |
104 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
100 | #endif |
105 | #endif |
101 | #if IOM_TIME |
106 | #if IOM_TIME |
102 | void reg (time_watcher *w); void unreg (time_watcher *w); |
107 | static void reg (time_watcher &w); static void unreg (time_watcher &w); |
103 | #endif |
108 | #endif |
104 | #if IOM_CHECK |
109 | #if IOM_CHECK |
105 | void reg (check_watcher *w); void unreg (check_watcher *w); |
110 | static void reg (check_watcher &w); static void unreg (check_watcher &w); |
106 | #endif |
111 | #endif |
107 | #if IOM_IDLE |
112 | #if IOM_IDLE |
108 | void reg (idle_watcher *w); void unreg (idle_watcher *w); |
113 | static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
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114 | #endif |
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115 | #if IOM_SIG |
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116 | static void reg (sig_watcher &w); static void unreg (sig_watcher &w); |
109 | #endif |
117 | #endif |
110 | |
118 | |
111 | void loop (); |
119 | static void loop (); |
112 | |
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113 | io_manager (); |
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114 | ~io_manager (); |
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115 | }; |
120 | }; |
116 | |
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117 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
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118 | |
121 | |
119 | struct watcher { |
122 | struct watcher { |
120 | int active; /* 0 == inactive, else index into respective vector */ |
123 | int active; /* 0 == inactive, else index into respective vector */ |
121 | |
124 | |
122 | watcher() : active(0) { } |
125 | watcher () : active (0) { } |
123 | }; |
126 | }; |
124 | |
127 | |
125 | #if IOM_IO |
128 | #if IOM_IO |
126 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
129 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
127 | |
130 | |
… | |
… | |
130 | short events; |
133 | short events; |
131 | |
134 | |
132 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
135 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
133 | |
136 | |
134 | void set (short events_) { set (fd, events_); } |
137 | void set (short events_) { set (fd, events_); } |
135 | void start () { iom.reg (this); } |
138 | void start () { io_manager::reg (*this); } |
136 | void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); } |
139 | void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); } |
137 | void stop () { iom.unreg (this); } |
140 | void stop () { io_manager::unreg (*this); } |
138 | |
141 | |
139 | template<class O1, class O2> |
142 | template<class O1, class O2> |
140 | io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) |
143 | io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
141 | : callback2<void, io_watcher &, short>(object,method) |
144 | : callback2<void, io_watcher &, short> (object,method) |
142 | { } |
145 | { } |
143 | ~io_watcher () { stop (); } |
146 | ~io_watcher () { stop (); } |
144 | }; |
147 | }; |
145 | #endif |
148 | #endif |
146 | |
149 | |
… | |
… | |
149 | tstamp at; |
152 | tstamp at; |
150 | |
153 | |
151 | void trigger (); |
154 | void trigger (); |
152 | |
155 | |
153 | void set (tstamp when) { at = when; } |
156 | void set (tstamp when) { at = when; } |
154 | void operator ()() { trigger (); } |
157 | void operator () () { trigger (); } |
155 | void start () { iom.reg (this); } |
158 | void start () { io_manager::reg (*this); } |
156 | void start (tstamp when) { set (when); iom.reg (this); } |
159 | void start (tstamp when) { set (when); io_manager::reg (*this); } |
157 | void stop () { iom.unreg (this); } |
160 | void stop () { io_manager::unreg (*this); } |
158 | |
161 | |
159 | template<class O1, class O2> |
162 | template<class O1, class O2> |
160 | time_watcher (O1 *object, void (O2::*method)(time_watcher &)) |
163 | time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
161 | : callback1<void, time_watcher &>(object,method) |
164 | : callback1<void, time_watcher &> (object,method), at (0) |
162 | { } |
165 | { } |
163 | ~time_watcher () { stop (); } |
166 | ~time_watcher () { stop (); } |
164 | }; |
167 | }; |
165 | #endif |
168 | #endif |
166 | |
169 | |
167 | #if IOM_CHECK |
170 | #if IOM_CHECK |
168 | // run before checking for new events |
171 | // run before checking for new events |
169 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
172 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
170 | void start () { iom.reg (this); } |
173 | void start () { io_manager::reg (*this); } |
171 | void stop () { iom.unreg (this); } |
174 | void stop () { io_manager::unreg (*this); } |
172 | |
175 | |
173 | template<class O1, class O2> |
176 | template<class O1, class O2> |
174 | check_watcher (O1 *object, void (O2::*method)(check_watcher &)) |
177 | check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
175 | : callback1<void, check_watcher &>(object,method) |
178 | : callback1<void, check_watcher &> (object,method) |
176 | { } |
179 | { } |
177 | ~check_watcher () { stop (); } |
180 | ~check_watcher () { stop (); } |
178 | }; |
181 | }; |
179 | #endif |
182 | #endif |
180 | |
183 | |
181 | #if IOM_IDLE |
184 | #if IOM_IDLE |
182 | // run after checking for any i/o, but before waiting |
185 | // run after checking for any i/o, but before waiting |
183 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
186 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
184 | void start () { iom.reg (this); } |
187 | void start () { io_manager::reg (*this); } |
185 | void stop () { iom.unreg (this); } |
188 | void stop () { io_manager::unreg (*this); } |
186 | |
189 | |
187 | template<class O1, class O2> |
190 | template<class O1, class O2> |
188 | idle_watcher (O1 *object, void (O2::*method)(idle_watcher &)) |
191 | idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
189 | : callback1<void, idle_watcher &>(object,method) |
192 | : callback1<void, idle_watcher &> (object,method) |
190 | { } |
193 | { } |
191 | ~idle_watcher () { stop (); } |
194 | ~idle_watcher () { stop (); } |
192 | }; |
195 | }; |
193 | #endif |
196 | #endif |
194 | |
197 | |
195 | #endif |
198 | #if IOM_SIG |
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199 | struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
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200 | int signum; |
196 | |
201 | |
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202 | void start (int signum); |
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203 | void stop () { io_manager::unreg (*this); } |
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204 | |
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205 | template<class O1, class O2> |
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206 | sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
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207 | : callback1<void, sig_watcher &> (object,method), signum (-1) |
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208 | { } |
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209 | ~sig_watcher () { stop (); } |
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210 | }; |
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211 | #endif |
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212 | |
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213 | #endif |
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214 | |