1 | /* |
1 | /* |
2 | iom.h -- I/O multiplexor |
2 | iom.h -- generic I/O multiplexer |
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3 | Copyright (C) 2003, 2004 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
5 | 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 |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your option) any later version. |
8 | |
11 | |
9 | 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, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
13 | |
16 | |
14 | 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 |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #ifndef VPE_IOM_H__ |
22 | #ifndef IOM_H__ |
20 | #define VPE_IOM_H__ |
23 | #define IOM_H__ |
21 | |
24 | |
22 | #include <vector> |
25 | // required: |
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26 | // - a vector template like simplevec or stl's vector |
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27 | // - defines for all watcher types required in your app |
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28 | // edit iom_conf.h as appropriate. |
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29 | #include "iom_conf.h" |
23 | |
30 | |
24 | #include <sys/poll.h> |
31 | #include "callback.h" |
25 | |
32 | |
26 | #include "slog.h" |
33 | #ifndef IOM_IO |
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34 | # define IOM_IO 0 |
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35 | #endif |
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36 | #ifndef IOM_TIME |
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37 | # define IOM_TIME 0 |
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38 | #endif |
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39 | #ifndef IOM_CHECK |
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40 | # define IOM_CHECK 0 |
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41 | #endif |
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42 | #ifndef IOM_IDLE |
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43 | # define IOM_IDLE 0 |
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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 |
27 | |
48 | |
28 | typedef double tstamp; |
49 | typedef double tstamp; |
29 | |
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30 | extern tstamp NOW; |
50 | extern tstamp NOW; |
31 | |
51 | |
32 | template<class R, class A> class callback; |
52 | struct watcher; |
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53 | #if IOM_IO |
33 | struct io_watcher; |
54 | struct io_watcher; |
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55 | #endif |
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56 | #if IOM_TIME |
34 | struct time_watcher; |
57 | struct time_watcher; |
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58 | #endif |
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59 | #if IOM_CHECK |
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60 | struct check_watcher; |
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61 | #endif |
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62 | #if IOM_IDLE |
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63 | struct idle_watcher; |
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64 | #endif |
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65 | #if IOM_SIG |
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66 | struct sig_watcher; |
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67 | #endif |
35 | |
68 | |
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69 | template<class watcher> |
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70 | struct io_manager_vec : vector<watcher *> { |
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71 | void erase_unordered (unsigned int pos) |
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72 | { |
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73 | watcher *w = (*this)[this->size () - 1]; |
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74 | this->pop_back (); |
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75 | |
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76 | if (!this->empty ()) |
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77 | if (((*this)[pos] = w)) // '=' is correct! |
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78 | w->active = pos + 1; |
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79 | } |
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80 | }; |
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81 | |
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82 | // only used as a namespace, and for initialisation purposes |
36 | class io_manager { |
83 | class io_manager { |
37 | vector<pollfd> pfs; |
84 | template<class watcher> |
38 | vector<const io_watcher *> iow; |
85 | static void reg (watcher &w, io_manager_vec<watcher> &queue); |
39 | vector<time_watcher *> tw; // actually a heap |
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40 | |
86 | |
41 | void idle_cb (tstamp &ts); time_watcher *idle; |
87 | template<class watcher> |
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88 | static void unreg (watcher &w, io_manager_vec<watcher> &queue); |
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89 | |
42 | public: |
90 | public: |
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91 | #if IOM_TIME |
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92 | // fetch time only |
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93 | static tstamp now (); |
43 | |
94 | |
44 | void reschedule_time_watchers (); |
95 | // set NOW |
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96 | static void set_now (); |
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97 | #endif |
45 | |
98 | |
46 | // register a watcher |
99 | // register a watcher |
47 | void reg (int fd, short events, io_watcher *w); |
100 | #if IOM_IO |
48 | void unreg (io_watcher *w); |
101 | static void reg (io_watcher &w); static void unreg (io_watcher &w); |
49 | void reg (time_watcher *w); |
102 | #endif |
50 | void unreg (time_watcher *w); |
103 | #if IOM_TIME |
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104 | static void reg (time_watcher &w); static void unreg (time_watcher &w); |
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105 | #endif |
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106 | #if IOM_CHECK |
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107 | static void reg (check_watcher &w); static void unreg (check_watcher &w); |
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108 | #endif |
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109 | #if IOM_IDLE |
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110 | static void reg (idle_watcher &w); static void unreg (idle_watcher &w); |
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111 | #endif |
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112 | #if IOM_SIG |
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113 | static void reg (sig_watcher &w); static void unreg (sig_watcher &w); |
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114 | #endif |
51 | |
115 | |
52 | void loop (); |
116 | static void loop (); |
53 | |
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54 | io_manager (); |
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55 | ~io_manager (); |
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56 | }; |
117 | }; |
57 | |
118 | |
58 | extern io_manager iom; |
119 | struct watcher { |
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120 | int active; /* 0 == inactive, else index into respective vector */ |
59 | |
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 | |
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128 | struct io_watcher : watcher, callback2<void, io_watcher &, short> { |
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129 | int fd; |
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130 | short events; |
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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 () { io_manager::reg (*this); } |
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136 | void start (int fd_, short events_) { set (fd_, events_); io_manager::reg (*this); } |
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137 | void stop () { io_manager::unreg (*this); } |
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138 | |
60 | template<class R, class A> |
139 | 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)) |
140 | io_watcher (O1 *object, void (O2::*method) (io_watcher &, short)) |
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141 | : callback2<void, io_watcher &, short> (object,method) |
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142 | { } |
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143 | ~io_watcher () { stop (); } |
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144 | }; |
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145 | #endif |
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146 | |
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147 | #if IOM_TIME |
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148 | struct time_watcher : watcher, callback1<void, time_watcher &> { |
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149 | tstamp at; |
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150 | |
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151 | void trigger (); |
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152 | |
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153 | void set (tstamp when) { at = when; } |
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154 | void operator () () { trigger (); } |
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155 | void start () { io_manager::reg (*this); } |
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156 | void start (tstamp when) { set (when); io_manager::reg (*this); } |
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157 | void stop () { io_manager::unreg (*this); } |
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158 | |
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159 | template<class O1, class O2> |
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160 | time_watcher (O1 *object, void (O2::*method) (time_watcher &)) |
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161 | : callback1<void, time_watcher &> (object,method), at (0) |
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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 () { io_manager::reg (*this); } |
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171 | void stop () { io_manager::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 () { io_manager::reg (*this); } |
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185 | void stop () { io_manager::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 &)) |
106 | : callback<void, short>(object,method) |
189 | : callback1<void, idle_watcher &> (object,method) |
107 | { } |
190 | { } |
108 | |
191 | ~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 () |
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120 | { |
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121 | iom.unreg (this); |
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122 | } |
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123 | }; |
192 | }; |
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193 | #endif |
124 | |
194 | |
125 | #define TSTAMP_CANCEL -1. |
195 | #if IOM_SIG |
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196 | struct sig_watcher : watcher, callback1<void, sig_watcher &> { |
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197 | int signum; |
126 | |
198 | |
127 | struct time_watcher : callback<void, tstamp &> { |
199 | void start (int signum); |
128 | bool registered; // already registered? |
200 | void stop () { io_manager::unreg (*this); } |
129 | tstamp at; |
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130 | |
201 | |
131 | template<class O1, class O2> |
202 | template<class O1, class O2> |
132 | time_watcher (O1 *object, void (O2::*method)(tstamp &)) |
203 | sig_watcher (O1 *object, void (O2::*method) (sig_watcher &)) |
133 | : callback<void, tstamp &>(object,method) |
204 | : callback1<void, sig_watcher &> (object,method), signum (-1) |
134 | , registered(false) |
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135 | { } |
205 | { } |
136 | |
206 | ~sig_watcher () { stop (); } |
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 () |
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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 | }; |
207 | }; |
167 | |
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168 | #endif |
208 | #endif |
169 | |
209 | |
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210 | #endif |
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211 | |