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 | |
… | |
… | |
45 | #endif |
47 | #endif |
46 | |
48 | |
47 | typedef double tstamp; |
49 | typedef double tstamp; |
48 | extern tstamp NOW; |
50 | extern tstamp NOW; |
49 | |
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) |
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54 | |
50 | struct watcher; |
55 | struct watcher; |
51 | #if IOM_IO |
56 | #if IOM_IO |
52 | struct io_watcher; |
57 | struct io_watcher; |
53 | #endif |
58 | #endif |
54 | #if IOM_TIME |
59 | #if IOM_TIME |
… | |
… | |
64 | struct sig_watcher; |
69 | struct sig_watcher; |
65 | #endif |
70 | #endif |
66 | |
71 | |
67 | template<class watcher> |
72 | template<class watcher> |
68 | struct io_manager_vec : vector<watcher *> { |
73 | 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) |
74 | void erase_unordered (unsigned int pos) |
74 | { |
75 | { |
75 | watcher *w = (*this)[this->size () - 1]; |
76 | watcher *w = (*this)[this->size () - 1]; |
76 | this->pop_back (); |
77 | this->pop_back (); |
77 | |
78 | |
78 | if (this->size ()) |
79 | if (!this->empty ()) |
79 | if ((*this)[pos] = w) |
80 | if (((*this)[pos] = w)) // '=' is correct! |
80 | w->active = pos + 1; |
81 | w->active = pos + 1; |
81 | } |
82 | } |
82 | }; |
83 | }; |
83 | |
84 | |
84 | // only used as a namespace, and for initialisation purposes |
85 | // only used as a namespace, and for initialisation purposes |
… | |
… | |
88 | |
89 | |
89 | template<class watcher> |
90 | template<class watcher> |
90 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
91 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
91 | |
92 | |
92 | 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 | |
93 | // register a watcher |
102 | // register a watcher |
94 | #if IOM_IO |
103 | #if IOM_IO |
95 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
104 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
96 | #endif |
105 | #endif |
97 | #if IOM_TIME |
106 | #if IOM_TIME |
… | |
… | |
115 | |
124 | |
116 | watcher () : active (0) { } |
125 | watcher () : active (0) { } |
117 | }; |
126 | }; |
118 | |
127 | |
119 | #if IOM_IO |
128 | #if IOM_IO |
120 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
129 | enum { EVENT_UNDEF = -1, EVENT_NONE = 0, EVENT_READ = 1, EVENT_WRITE = 2 }; |
121 | |
130 | |
122 | struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
131 | struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
123 | int fd; |
132 | int fd; |
124 | short events; |
133 | short events; |
125 | |
134 | |