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) 2003-2006 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 | |
… | |
… | |
24 | // - a vector template like simplevec or stl's vector |
26 | // - a vector template like simplevec or stl's vector |
25 | // - defines for all watcher types required in your app |
27 | // - defines for all watcher types required in your app |
26 | // edit iom_conf.h as appropriate. |
28 | // edit iom_conf.h as appropriate. |
27 | #include "iom_conf.h" |
29 | #include "iom_conf.h" |
28 | |
30 | |
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31 | #if IOM_CHILD |
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32 | # undef IOM_SIG |
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33 | # define IOM_SIG 1 |
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34 | #endif |
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35 | |
29 | #include "callback.h" |
36 | #include "callback.h" |
30 | |
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31 | #ifndef IOM_IO |
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32 | # define IOM_IO 0 |
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33 | #endif |
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34 | #ifndef IOM_TIME |
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35 | # define IOM_TIME 0 |
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36 | #endif |
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37 | #ifndef IOM_CHECK |
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38 | # define IOM_CHECK 0 |
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39 | #endif |
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40 | #ifndef IOM_IDLE |
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41 | # define IOM_IDLE 0 |
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42 | #endif |
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43 | |
37 | |
44 | typedef double tstamp; |
38 | typedef double tstamp; |
45 | extern tstamp NOW; |
39 | extern tstamp NOW; |
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40 | |
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41 | // TSTAMP_MAX must still fit into a positive struct timeval |
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42 | #define TSTAMP_MAX (double)(1UL<<31) |
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43 | |
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44 | //#define IOM_LIBEVENT "event.h" *NOT* a supported feature |
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45 | #ifdef IOM_LIBEVENT |
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46 | # include <sys/time.h> |
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47 | # include IOM_LIBEVENT |
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48 | # undef IOM_IO |
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49 | # define IOM_IO 1 |
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50 | # undef IOM_TIME |
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51 | # define IOM_TIME 1 |
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52 | # undef IOM_IDLE // NYI |
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53 | # undef IOM_SIG // NYI |
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54 | # undef IOM_CHILD // NYI |
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55 | #endif |
46 | |
56 | |
47 | struct watcher; |
57 | struct watcher; |
48 | #if IOM_IO |
58 | #if IOM_IO |
49 | struct io_watcher; |
59 | struct io_watcher; |
50 | #endif |
60 | #endif |
… | |
… | |
55 | struct check_watcher; |
65 | struct check_watcher; |
56 | #endif |
66 | #endif |
57 | #if IOM_IDLE |
67 | #if IOM_IDLE |
58 | struct idle_watcher; |
68 | struct idle_watcher; |
59 | #endif |
69 | #endif |
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70 | #if IOM_SIG |
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71 | struct sig_watcher; |
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72 | #endif |
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73 | #if IOM_CHILD |
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74 | struct child_watcher; |
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75 | #endif |
60 | |
76 | |
61 | template<class watcher> |
77 | template<class watcher> |
62 | struct io_manager_vec : vector<watcher *> { |
78 | struct io_manager_vec : vector<watcher *> { |
63 | #if IOM_CHECK |
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64 | bool activity; |
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65 | #endif |
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66 | |
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67 | void erase_unordered (unsigned int pos) |
79 | void erase_unordered (unsigned int pos) |
68 | { |
80 | { |
69 | watcher *w = (*this)[size () - 1]; |
81 | watcher *w = (*this)[this->size () - 1]; |
70 | pop_back (); |
82 | this->pop_back (); |
71 | |
83 | |
72 | if (size ()) |
84 | if (!this->empty ()) |
73 | if ((*this)[pos] = w) |
85 | if (((*this)[pos] = w)) // '=' is correct! |
74 | w->active = pos + 1; |
86 | w->active = pos + 1; |
75 | } |
87 | } |
76 | }; |
88 | }; |
77 | |
89 | |
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90 | // only used as a namespace, and for initialisation purposes |
78 | class io_manager { |
91 | class io_manager { |
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92 | template<class watcher> |
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93 | static void reg (watcher &w, io_manager_vec<watcher> &queue); |
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94 | |
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95 | template<class watcher> |
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96 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
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97 | |
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98 | public: |
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99 | #if IOM_TIME |
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100 | // fetch time only |
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101 | static tstamp now (); |
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102 | |
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103 | // set NOW |
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104 | static void set_now (); |
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105 | #endif |
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106 | |
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107 | // register a watcher |
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108 | #ifndef IOM_LIBEVENT |
79 | #if IOM_IO |
109 | #if IOM_IO |
80 | io_manager_vec<io_watcher> iow; |
110 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
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111 | #endif |
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112 | #if IOM_TIME |
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113 | static void reg (time_watcher &w); static void unreg (time_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); |
81 | #endif |
117 | #endif |
82 | #if IOM_CHECK |
118 | #if IOM_CHECK |
83 | io_manager_vec<check_watcher> cw; |
119 | static void reg (check_watcher &w); static void unreg (check_watcher &w); |
84 | #endif |
120 | #endif |
85 | #if IOM_TIME |
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86 | io_manager_vec<time_watcher> tw; |
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87 | #endif |
121 | #endif |
88 | #if IOM_IDLE |
122 | #if IOM_IDLE |
89 | io_manager_vec<idle_watcher> iw; |
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90 | #endif |
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91 | |
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92 | template<class watcher> |
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93 | void reg (watcher *w, io_manager_vec<watcher> &queue); |
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94 | |
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95 | template<class watcher> |
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96 | void unreg (watcher *w, io_manager_vec<watcher> &queue); |
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97 | |
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98 | public: |
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99 | // register a watcher |
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100 | #if IOM_IO |
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101 | void reg (io_watcher *w); void unreg (io_watcher *w); |
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102 | #endif |
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103 | #if IOM_TIME |
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104 | void reg (time_watcher *w); void unreg (time_watcher *w); |
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105 | #endif |
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106 | #if IOM_CHECK |
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107 | void reg (check_watcher *w); void unreg (check_watcher *w); |
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108 | #endif |
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109 | #if IOM_IDLE |
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110 | void reg (idle_watcher *w); void unreg (idle_watcher *w); |
123 | static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
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124 | #endif |
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125 | #if IOM_CHILD |
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126 | static void reg (child_watcher &w); static void unreg (child_watcher &w); |
111 | #endif |
127 | #endif |
112 | |
128 | |
113 | void loop (); |
129 | static void loop (); |
114 | |
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115 | io_manager (); |
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116 | ~io_manager (); |
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117 | }; |
130 | }; |
118 | |
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119 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
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120 | |
131 | |
121 | struct watcher { |
132 | struct watcher { |
122 | int active; /* 0 == inactive, else index into respective vector */ |
133 | int active; /* 0 == inactive, else index into respective vector */ |
123 | |
134 | |
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135 | bool is_active () { return active; } |
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136 | |
124 | watcher () : active (0) { } |
137 | watcher () : active (0) { } |
125 | }; |
138 | }; |
126 | |
139 | |
127 | #if IOM_IO |
140 | #if IOM_IO |
128 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
141 | #ifdef IOM_LIBEVENT |
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142 | enum { EVENT_UNDEF = -1, EVENT_NONE = 0, EVENT_READ = EV_READ, EVENT_WRITE = EV_WRITE }; |
129 | |
143 | |
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144 | void iom_io_c_callback (int fd, short events, void *data); |
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145 | |
130 | struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
146 | struct io_watcher : watcher, callback<void (io_watcher &, short)> { |
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147 | struct event ev; |
131 | int fd; |
148 | int fd; |
132 | short events; |
149 | short events; |
133 | |
150 | |
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151 | void set (int fd_, short events_); |
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152 | void set (short events_) { set (fd, events_); } |
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153 | void start () { if (!active) event_add (&ev, 0); active = 1; } |
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154 | void start (int fd_, short events_) { set (fd_, events_); start (); } |
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155 | void stop () { if (active) event_del (&ev); active = 0; } |
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156 | |
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157 | template<class O, class M> |
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158 | io_watcher (O object, M method) |
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159 | : callback<void (io_watcher &, short)> (object, method) |
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160 | { } |
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161 | ~io_watcher () { stop (); } |
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162 | }; |
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163 | #else |
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164 | enum { EVENT_UNDEF = -1, EVENT_NONE = 0, EVENT_READ = 1, EVENT_WRITE = 2 }; |
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165 | |
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166 | struct io_watcher : watcher, callback<void (io_watcher &, short)> { |
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167 | int fd; |
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168 | short events; |
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169 | |
134 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
170 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
135 | |
171 | |
136 | void set (short events_) { set (fd, events_); } |
172 | void set (short events_) { set (fd, events_); } |
137 | void start () { iom.reg (this); } |
173 | void start () { io_manager::reg (*this); } |
138 | void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); } |
174 | void start (int fd_, short events_) { set (fd_, events_); start (); } |
139 | void stop () { iom.unreg (this); } |
175 | void stop () { io_manager::unreg (*this); } |
140 | |
176 | |
141 | template<class O1, class O2> |
177 | template<class O, class M> |
142 | io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
178 | io_watcher (O object, M method) |
143 | : callback2<void, io_watcher &, short> (object,method) |
179 | : callback<void (io_watcher &, short)> (object, method) |
144 | { } |
180 | { } |
145 | ~io_watcher () { stop (); } |
181 | ~io_watcher () { stop (); } |
146 | }; |
182 | }; |
147 | #endif |
183 | #endif |
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184 | #endif |
148 | |
185 | |
149 | #if IOM_TIME |
186 | #if IOM_TIME |
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187 | #ifdef IOM_LIBEVENT |
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188 | void iom_time_c_callback (int fd, short events, void *data); |
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189 | |
150 | struct time_watcher : watcher, callback1<void, time_watcher &> { |
190 | struct time_watcher : watcher, callback<void (time_watcher &)> { |
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191 | struct event ev; |
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192 | tstamp at; |
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193 | |
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194 | void trigger (); |
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195 | |
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196 | void set (tstamp when) |
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197 | { |
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198 | at = when; |
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199 | if (active) |
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200 | start (); |
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201 | } |
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202 | void operator () () { trigger (); } |
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203 | void start (); |
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204 | void start (tstamp when) { at = when; start (); } |
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205 | void stop () { if (active) evtimer_del (&ev); active = 0; } |
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206 | |
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207 | template<class O, class M> |
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208 | time_watcher (O object, M method) |
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209 | : callback<void (time_watcher &)> (object, method), at (0) |
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210 | { } |
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211 | ~time_watcher () { stop (); } |
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212 | }; |
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213 | #else |
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214 | struct time_watcher : watcher, callback<void (time_watcher &)> { |
151 | tstamp at; |
215 | tstamp at; |
152 | |
216 | |
153 | void trigger (); |
217 | void trigger (); |
154 | |
218 | |
155 | void set (tstamp when) { at = when; } |
219 | void set (tstamp when) { at = when; } |
156 | void operator () () { trigger (); } |
220 | void operator () () { trigger (); } |
157 | void start () { iom.reg (this); } |
221 | void start () { io_manager::reg (*this); } |
158 | void start (tstamp when) { set (when); iom.reg (this); } |
222 | void start (tstamp when) { set (when); start (); } |
159 | void stop () { iom.unreg (this); } |
223 | void stop () { io_manager::unreg (*this); } |
160 | |
224 | |
161 | template<class O1, class O2> |
225 | template<class O, class M> |
162 | time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
226 | time_watcher (O object, M method) |
163 | : callback1<void, time_watcher &> (object,method), at (0) |
227 | : callback<void (time_watcher &)> (object, method), at (0) |
164 | { } |
228 | { } |
165 | ~time_watcher () { stop (); } |
229 | ~time_watcher () { stop (); } |
166 | }; |
230 | }; |
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231 | #endif |
167 | #endif |
232 | #endif |
168 | |
233 | |
169 | #if IOM_CHECK |
234 | #if IOM_CHECK |
170 | // run before checking for new events |
235 | // run before checking for new events |
171 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
236 | struct check_watcher : watcher, callback<void (check_watcher &)> { |
172 | void start () { iom.reg (this); } |
237 | void start () { io_manager::reg (*this); } |
173 | void stop () { iom.unreg (this); } |
238 | void stop () { io_manager::unreg (*this); } |
174 | |
239 | |
175 | template<class O1, class O2> |
240 | template<class O, class M> |
176 | check_watcher (O1 *object, void (O2::*method) (check_watcher &)) |
241 | check_watcher (O object, M method) |
177 | : callback1<void, check_watcher &> (object,method) |
242 | : callback<void (check_watcher &)> (object, method) |
178 | { } |
243 | { } |
179 | ~check_watcher () { stop (); } |
244 | ~check_watcher () { stop (); } |
180 | }; |
245 | }; |
181 | #endif |
246 | #endif |
182 | |
247 | |
183 | #if IOM_IDLE |
248 | #if IOM_IDLE |
184 | // run after checking for any i/o, but before waiting |
249 | // run after checking for any i/o, but before waiting |
185 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
250 | struct idle_watcher : watcher, callback<void (idle_watcher &)> { |
186 | void start () { iom.reg (this); } |
251 | void start () { io_manager::reg (*this); } |
187 | void stop () { iom.unreg (this); } |
252 | void stop () { io_manager::unreg (*this); } |
188 | |
253 | |
189 | template<class O1, class O2> |
254 | template<class O, class M> |
190 | idle_watcher (O1 *object, void (O2::*method) (idle_watcher &)) |
255 | idle_watcher (O object, M method) |
191 | : callback1<void, idle_watcher &> (object,method) |
256 | : callback<void (idle_watcher &)> (object, method) |
192 | { } |
257 | { } |
193 | ~idle_watcher () { stop (); } |
258 | ~idle_watcher () { stop (); } |
194 | }; |
259 | }; |
195 | #endif |
260 | #endif |
196 | |
261 | |
197 | #endif |
262 | #if IOM_SIG |
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263 | struct sig_watcher : watcher, callback<void (sig_watcher &)> { |
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264 | int signum; |
198 | |
265 | |
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266 | void start (int signum); |
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267 | void stop () { io_manager::unreg (*this); } |
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268 | |
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269 | template<class O, class M> |
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270 | sig_watcher (O object, M method) |
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271 | : callback<void(sig_watcher &)> (object, method), signum (0) |
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272 | { } |
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273 | ~sig_watcher () { stop (); } |
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274 | }; |
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275 | #endif |
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276 | |
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277 | #if IOM_CHILD |
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278 | struct child_watcher : watcher, callback<void (child_watcher &, int)> { |
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279 | int /*pid_t*/ pid; |
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280 | |
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281 | void start (int pid) { this->pid = pid; io_manager::reg (*this); } |
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282 | void stop () { io_manager::unreg (*this); } |
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283 | |
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284 | template<class O, class M> |
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285 | child_watcher (O object, M method) |
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286 | : callback<void (child_watcher &, int)> (object, method), pid (0) |
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287 | { } |
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288 | ~child_watcher () { stop (); } |
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289 | }; |
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290 | #endif |
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291 | |
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292 | #endif |
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293 | |