1 | /* |
1 | /* |
2 | iom.h -- I/O multiplexor |
2 | iom.h -- generic I/O multiplexor |
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3 | Copyright (C) 2003, 2004 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | 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 |
5 | 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 |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
14 | 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 |
15 | along with this program; if not, write to the Free Software |
16 | along with this program; if not, write to the Free Software |
16 | 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 |
17 | */ |
18 | */ |
18 | |
19 | |
19 | #ifndef VPE_IOM_H__ |
20 | #ifndef IOM_H__ |
20 | #define VPE_IOM_H__ |
21 | #define IOM_H__ |
21 | |
22 | |
22 | #include <vector> |
23 | // required: |
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24 | // - a vector template like simplevec or stl's vector |
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25 | // - defines for all watcher types required in your app |
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26 | // edit iom_conf.h as appropriate. |
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27 | #include "iom_conf.h" |
23 | |
28 | |
24 | #include <sys/poll.h> |
29 | #include "callback.h" |
25 | |
30 | |
26 | #include "slog.h" |
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 |
27 | |
43 | |
28 | typedef double tstamp; |
44 | typedef double tstamp; |
29 | |
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30 | extern tstamp NOW; |
45 | extern tstamp NOW; |
31 | |
46 | |
32 | template<class R, class A> class callback; |
47 | struct watcher; |
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48 | #if IOM_IO |
33 | struct io_watcher; |
49 | struct io_watcher; |
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50 | #endif |
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51 | #if IOM_TIME |
34 | 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 | #if IOM_CHECK |
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66 | bool activity; |
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67 | #endif |
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68 | |
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69 | void erase_unordered (unsigned int pos) |
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70 | { |
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71 | watcher *w = (*this)[size () - 1]; |
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72 | pop_back (); |
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73 | |
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74 | if (size ()) |
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75 | if ((*this)[pos] = w) |
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76 | w->active = pos + 1; |
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77 | } |
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78 | }; |
35 | |
79 | |
36 | class io_manager { |
80 | class io_manager { |
37 | vector<pollfd> pfs; |
81 | #if IOM_IO |
38 | vector<const io_watcher *> iow; |
82 | io_manager_vec<io_watcher> iow; |
39 | vector<time_watcher *> tw; // actually a heap |
83 | #endif |
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84 | #if IOM_CHECK |
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85 | io_manager_vec<check_watcher> cw; |
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86 | #endif |
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87 | #if IOM_TIME |
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88 | io_manager_vec<time_watcher> tw; |
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89 | #endif |
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90 | #if IOM_IDLE |
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91 | io_manager_vec<idle_watcher> iw; |
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92 | #endif |
40 | |
93 | |
41 | void idle_cb (tstamp &ts); time_watcher *idle; |
94 | template<class watcher> |
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95 | void reg (watcher *w, io_manager_vec<watcher> &queue); |
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96 | |
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97 | template<class watcher> |
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98 | void unreg (watcher *w, io_manager_vec<watcher> &queue); |
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99 | |
42 | public: |
100 | public: |
43 | |
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44 | void reschedule_time_watchers (); |
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45 | |
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46 | // register a watcher |
101 | // register a watcher |
47 | void reg (int fd, short events, io_watcher *w); |
102 | #if IOM_IO |
48 | void unreg (const io_watcher *w); |
103 | void reg (io_watcher *w); void unreg (io_watcher *w); |
49 | void reg (time_watcher *w); |
104 | #endif |
50 | void unreg (const time_watcher *w); |
105 | #if IOM_TIME |
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106 | void reg (time_watcher *w); void unreg (time_watcher *w); |
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107 | #endif |
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108 | #if IOM_CHECK |
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109 | void reg (check_watcher *w); void unreg (check_watcher *w); |
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110 | #endif |
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111 | #if IOM_IDLE |
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112 | void reg (idle_watcher *w); void unreg (idle_watcher *w); |
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113 | #endif |
51 | |
114 | |
52 | void loop (); |
115 | void loop (); |
53 | |
116 | |
54 | io_manager (); |
117 | io_manager (); |
55 | ~io_manager (); |
118 | ~io_manager (); |
56 | }; |
119 | }; |
57 | |
120 | |
58 | extern io_manager iom; |
121 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
59 | |
122 | |
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123 | struct watcher { |
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124 | int active; /* 0 == inactive, else index into respective vector */ |
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125 | |
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126 | watcher() : active(0) { } |
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127 | }; |
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128 | |
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129 | #if IOM_IO |
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130 | enum { EVENT_READ = 1, EVENT_WRITE = 2 }; |
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131 | |
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132 | struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
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133 | int fd; |
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134 | short events; |
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135 | |
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136 | void set (int fd_, short events_) { fd = fd_; events = events_; } |
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137 | |
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138 | void set (short events_) { set (fd, events_); } |
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139 | void start () { iom.reg (this); } |
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140 | void start (int fd_, short events_) { set (fd_, events_); iom.reg (this); } |
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141 | void stop () { iom.unreg (this); } |
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142 | |
60 | template<class R, class A> |
143 | template<class O1, class O2> |
61 | class callback { |
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62 | struct object { }; |
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63 | |
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64 | void *obj; |
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65 | R (object::*meth)(A arg); |
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66 | |
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67 | // a proxy is a kind of recipe on how to call a specific class method |
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68 | struct proxy_base { |
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69 | virtual R call (void *obj, R (object::*meth)(A), A arg) = 0; |
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70 | }; |
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71 | template<class O1, class O2> |
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72 | struct proxy : proxy_base { |
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73 | virtual R call (void *obj, R (object::*meth)(A), A arg) |
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74 | { |
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75 | ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<R (O2::*)(A)>(meth))) |
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76 | (arg); |
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77 | } |
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78 | }; |
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79 | |
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80 | proxy_base *prxy; |
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81 | |
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82 | public: |
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83 | template<class O1, class O2> |
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84 | callback (O1 *object, R (O2::*method)(A)) |
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85 | { |
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86 | static proxy<O1,O2> p; |
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87 | obj = reinterpret_cast<void *>(object); |
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88 | meth = reinterpret_cast<R (object::*)(A)>(method); |
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89 | prxy = &p; |
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90 | } |
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91 | |
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92 | R call(A arg) const |
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93 | { |
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94 | return prxy->call (obj, meth, arg); |
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95 | } |
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96 | |
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97 | R operator ()(A arg) const |
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98 | { |
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99 | return call (arg); |
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100 | } |
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101 | }; |
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102 | |
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103 | struct io_watcher : callback<void, short> { |
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104 | template<class O1, class O2> |
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105 | io_watcher (O1 *object, void (O2::*method)(short revents)) |
144 | io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) |
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145 | : callback2<void, io_watcher &, short>(object,method) |
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146 | { } |
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147 | ~io_watcher () { stop (); } |
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148 | }; |
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149 | #endif |
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150 | |
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151 | #if IOM_TIME |
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152 | struct time_watcher : watcher, callback1<void, time_watcher &> { |
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153 | tstamp at; |
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154 | |
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155 | void trigger (); |
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156 | |
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157 | void set (tstamp when) { at = when; } |
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158 | void operator ()() { trigger (); } |
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159 | void start () { iom.reg (this); } |
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160 | void start (tstamp when) { set (when); iom.reg (this); } |
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161 | void stop () { iom.unreg (this); } |
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162 | |
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163 | template<class O1, class O2> |
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164 | time_watcher (O1 *object, void (O2::*method)(time_watcher &)) |
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165 | : callback1<void, time_watcher &>(object,method), at(0) |
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166 | { } |
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167 | ~time_watcher () { stop (); } |
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168 | }; |
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169 | #endif |
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170 | |
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171 | #if IOM_CHECK |
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172 | // run before checking for new events |
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173 | struct check_watcher : watcher, callback1<void, check_watcher &> { |
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174 | void start () { iom.reg (this); } |
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175 | void stop () { iom.unreg (this); } |
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176 | |
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177 | template<class O1, class O2> |
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178 | check_watcher (O1 *object, void (O2::*method)(check_watcher &)) |
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179 | : callback1<void, check_watcher &>(object,method) |
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180 | { } |
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181 | ~check_watcher () { stop (); } |
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182 | }; |
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183 | #endif |
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184 | |
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185 | #if IOM_IDLE |
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186 | // run after checking for any i/o, but before waiting |
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187 | struct idle_watcher : watcher, callback1<void, idle_watcher &> { |
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188 | void start () { iom.reg (this); } |
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189 | void stop () { iom.unreg (this); } |
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190 | |
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191 | template<class O1, class O2> |
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192 | idle_watcher (O1 *object, void (O2::*method)(idle_watcher &)) |
106 | : callback<void, short>(object,method) |
193 | : callback1<void, idle_watcher &>(object,method) |
107 | { } |
194 | { } |
108 | |
195 | ~idle_watcher () { stop (); } |
109 | ~io_watcher () |
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110 | { |
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111 | iom.unreg (this); |
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112 | } |
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113 | |
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114 | void start (int fd, short events) |
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115 | { |
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116 | iom.reg (fd, events, this); |
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117 | } |
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118 | |
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119 | void stop () const |
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120 | { |
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121 | iom.unreg (this); |
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122 | } |
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123 | }; |
196 | }; |
124 | |
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125 | #define TSTAMP_CANCEL -1. |
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126 | |
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127 | struct time_watcher : callback<void, tstamp &> { |
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128 | bool registered; // already registered? |
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129 | tstamp at; |
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130 | |
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131 | template<class O1, class O2> |
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132 | time_watcher (O1 *object, void (O2::*method)(tstamp &)) |
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133 | : callback<void, tstamp &>(object,method) |
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134 | , registered(false) |
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135 | { } |
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136 | |
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137 | ~time_watcher () |
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138 | { |
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139 | iom.unreg (this); |
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140 | } |
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141 | |
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142 | void set (tstamp when); |
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143 | void trigger (); |
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144 | |
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145 | void operator ()() |
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146 | { |
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147 | trigger (); |
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148 | } |
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149 | |
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150 | void start (); |
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151 | void start (tstamp when) |
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152 | { |
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153 | set (when); |
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154 | } |
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155 | |
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156 | void stop () const |
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157 | { |
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158 | iom.unreg (this); |
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159 | } |
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160 | |
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161 | void reset (tstamp when = TSTAMP_CANCEL) |
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162 | { |
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163 | stop (); |
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164 | at = when; |
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165 | } |
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166 | }; |
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167 | |
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168 | #endif |
197 | #endif |
169 | |
198 | |
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199 | #endif |
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200 | |