1 | /* |
1 | /* |
2 | iom.h -- generic I/O multiplexor |
2 | iom.h -- generic I/O multiplexor |
3 | Copyright (C) 2003 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 |
8 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
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. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
18 | */ |
19 | |
19 | |
20 | #ifndef VPE_IOM_H__ |
20 | #ifndef IOM_H__ |
21 | #define VPE_IOM_H__ |
21 | #define IOM_H__ |
22 | |
22 | |
23 | #include <vector> |
23 | // required: |
24 | |
24 | // - a vector template like simplevec or stl's vector |
25 | #include <cassert> |
25 | // - defines for all watcher types required in your app |
26 | |
26 | // edit iom_conf.h as appropriate. |
27 | #include "poll.h" |
27 | #include "iom_conf.h" |
28 | |
28 | |
29 | #include "callback.h" |
29 | #include "callback.h" |
30 | #include "slog.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 |
31 | |
43 | |
32 | typedef double tstamp; |
44 | typedef double tstamp; |
33 | |
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34 | extern tstamp NOW; |
45 | extern tstamp NOW; |
35 | |
46 | |
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47 | struct watcher; |
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48 | #if IOM_IO |
36 | struct io_watcher; |
49 | struct io_watcher; |
|
|
50 | #endif |
|
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51 | #if IOM_TIME |
37 | struct time_watcher; |
52 | struct time_watcher; |
|
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53 | #endif |
|
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54 | #if IOM_CHECK |
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55 | struct check_watcher; |
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56 | #endif |
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57 | #if IOM_IDLE |
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58 | struct idle_watcher; |
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59 | #endif |
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60 | |
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61 | template<class watcher> |
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62 | struct io_manager_vec : protected vector<watcher *> { |
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63 | friend class io_manager; |
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64 | protected: |
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65 | void erase_unordered (unsigned int pos) |
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66 | { |
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67 | watcher *w = (*this)[size () - 1]; |
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68 | pop_back (); |
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69 | |
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70 | if (size ()) |
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71 | if ((*this)[pos] = w) |
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72 | w->active = pos + 1; |
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73 | } |
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74 | }; |
38 | |
75 | |
39 | class io_manager { |
76 | class io_manager { |
40 | vector<pollfd> pfs; |
77 | #if IOM_IO |
41 | vector<io_watcher *> iow; |
78 | io_manager_vec<io_watcher> iow; |
42 | vector<time_watcher *> tw; // actually a heap |
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 |
43 | |
89 | |
44 | void idle_cb (time_watcher &w); time_watcher *idle; |
90 | template<class watcher> |
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91 | void reg (watcher *w, io_manager_vec<watcher> &queue); |
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92 | |
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93 | template<class watcher> |
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94 | void unreg (watcher *w, io_manager_vec<watcher> &queue); |
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95 | |
45 | public: |
96 | public: |
46 | |
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47 | void reschedule_time_watchers (); |
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48 | |
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49 | // register a watcher |
97 | // register a watcher |
50 | void reg (io_watcher *w); |
98 | #if IOM_IO |
51 | void unreg (io_watcher *w); |
99 | void reg (io_watcher *w); void unreg (io_watcher *w); |
52 | void reg (time_watcher *w); |
100 | #endif |
53 | void unreg (time_watcher *w); |
101 | #if IOM_TIME |
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102 | void reg (time_watcher *w); void unreg (time_watcher *w); |
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103 | #endif |
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104 | #if IOM_CHECK |
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105 | void reg (check_watcher *w); void unreg (check_watcher *w); |
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106 | #endif |
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107 | #if IOM_IDLE |
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108 | void reg (idle_watcher *w); void unreg (idle_watcher *w); |
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109 | #endif |
54 | |
110 | |
55 | void loop (); |
111 | void loop (); |
56 | |
112 | |
57 | io_manager (); |
113 | io_manager (); |
58 | ~io_manager (); |
114 | ~io_manager (); |
59 | }; |
115 | }; |
60 | |
116 | |
61 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
117 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
62 | |
118 | |
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119 | struct watcher { |
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120 | int active; /* 0 == inactive, else index into respective vector */ |
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121 | |
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122 | watcher() : active(0) { } |
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123 | }; |
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124 | |
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125 | #if IOM_IO |
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126 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
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127 | |
63 | struct io_watcher : callback2<void, io_watcher &, short> { |
128 | struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
64 | bool registered; // already registered? |
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65 | int fd; |
129 | int fd; |
66 | short events; |
130 | short events; |
67 | |
131 | |
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132 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
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133 | |
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134 | void set (short events_) { set (fd, events_); } |
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135 | void start () { iom.reg (this); } |
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136 | void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); } |
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137 | void stop () { iom.unreg (this); } |
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138 | |
68 | template<class O1, class O2> |
139 | template<class O1, class O2> |
69 | io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) |
140 | io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) |
70 | : callback2<void, io_watcher &, short>(object,method) |
141 | : callback2<void, io_watcher &, short>(object,method) |
71 | , registered(false) |
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72 | { } |
142 | { } |
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143 | ~io_watcher () { stop (); } |
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144 | }; |
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145 | #endif |
73 | |
146 | |
74 | ~io_watcher (); |
147 | #if IOM_TIME |
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148 | struct time_watcher : watcher, callback1<void, time_watcher &> { |
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149 | tstamp at; |
75 | |
150 | |
76 | void set(int fd_, short events_); |
151 | void trigger (); |
77 | |
152 | |
78 | void set(short events_) |
153 | void set (tstamp when) { at = when; } |
79 | { |
154 | void operator ()() { trigger (); } |
80 | set (fd, events_); |
155 | void start () { iom.reg (this); } |
81 | } |
156 | void start (tstamp when) { set (when); iom.reg (this); } |
82 | |
157 | void stop () { iom.unreg (this); } |
83 | void start (int fd_, short events_) |
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84 | { |
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85 | set (fd_, events_); |
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86 | iom.reg (this); |
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87 | } |
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88 | |
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89 | void stop () |
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90 | { |
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91 | iom.unreg (this); |
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92 | } |
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93 | }; |
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94 | |
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95 | #define TSTAMP_CANCEL -1. |
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96 | |
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97 | struct time_watcher : callback1<void, time_watcher &> { |
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98 | bool registered; // already registered? |
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99 | tstamp at; |
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100 | |
158 | |
101 | template<class O1, class O2> |
159 | template<class O1, class O2> |
102 | time_watcher (O1 *object, void (O2::*method)(time_watcher &)) |
160 | time_watcher (O1 *object, void (O2::*method)(time_watcher &)) |
103 | : callback1<void, time_watcher &>(object,method) |
161 | : callback1<void, time_watcher &>(object,method) |
104 | , registered(false) |
162 | { } |
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163 | ~time_watcher () { stop (); } |
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164 | }; |
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165 | #endif |
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166 | |
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167 | #if IOM_CHECK |
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168 | // run before checking for new events |
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169 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
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170 | void start () { iom.reg (this); } |
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171 | void stop () { iom.unreg (this); } |
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172 | |
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173 | template<class O1, class O2> |
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174 | check_watcher (O1 *object, void (O2::*method)(check_watcher &)) |
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175 | : callback1<void, check_watcher &>(object,method) |
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176 | { } |
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177 | ~check_watcher () { stop (); } |
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178 | }; |
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179 | #endif |
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180 | |
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181 | #if IOM_IDLE |
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182 | // run after checking for any i/o, but before waiting |
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183 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
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184 | void start () { iom.reg (this); } |
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185 | void stop () { iom.unreg (this); } |
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186 | |
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187 | template<class O1, class O2> |
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188 | idle_watcher (O1 *object, void (O2::*method)(idle_watcher &)) |
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189 | : callback1<void, idle_watcher &>(object,method) |
105 | { } |
190 | { } |
106 | |
191 | ~idle_watcher () { stop (); } |
107 | ~time_watcher (); |
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108 | |
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109 | void set (tstamp when); |
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110 | void trigger (); |
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111 | |
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112 | void operator ()() |
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113 | { |
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114 | trigger (); |
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115 | } |
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116 | |
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117 | void start () |
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118 | { |
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119 | iom.reg (this); |
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120 | } |
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121 | |
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122 | void start (tstamp when) |
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123 | { |
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124 | set (when); |
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125 | iom.reg (this); |
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126 | } |
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127 | |
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128 | void stop () |
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129 | { |
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130 | iom.unreg (this); |
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131 | } |
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132 | |
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133 | void reset (tstamp when = TSTAMP_CANCEL) |
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134 | { |
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135 | stop (); |
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136 | at = when; |
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137 | } |
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138 | }; |
192 | }; |
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193 | #endif |
139 | |
194 | |
140 | #endif |
195 | #endif |
141 | |
196 | |