1 | /* |
1 | /* |
2 | iom.h -- I/O multiplexor |
2 | iom.h -- generic I/O multiplexor |
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3 | Copyright (C) 2003 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. |
… | |
… | |
19 | #ifndef VPE_IOM_H__ |
20 | #ifndef VPE_IOM_H__ |
20 | #define VPE_IOM_H__ |
21 | #define VPE_IOM_H__ |
21 | |
22 | |
22 | #include <vector> |
23 | #include <vector> |
23 | |
24 | |
24 | #include <sys/poll.h> |
25 | #include <cassert> |
25 | |
26 | |
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27 | #include "poll.h" |
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28 | |
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29 | #include "callback.h" |
26 | #include "slog.h" |
30 | #include "slog.h" |
27 | |
31 | |
28 | typedef double tstamp; |
32 | typedef double tstamp; |
29 | |
33 | |
30 | extern tstamp NOW; |
34 | extern tstamp NOW; |
31 | |
35 | |
32 | template<class R, class A> class callback; |
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33 | struct io_watcher; |
36 | struct io_watcher; |
34 | struct time_watcher; |
37 | struct time_watcher; |
35 | |
38 | |
36 | class io_manager { |
39 | class io_manager { |
37 | vector<pollfd> pfs; |
40 | vector<pollfd> pfs; |
38 | vector<const io_watcher *> iow; |
41 | vector<io_watcher *> iow; |
39 | vector<time_watcher *> tw; // actually a heap |
42 | vector<time_watcher *> tw; // actually a heap |
40 | |
43 | |
41 | void idle_cb (tstamp &ts); time_watcher *idle; |
44 | void idle_cb (time_watcher &w); time_watcher *idle; |
42 | public: |
45 | public: |
43 | |
46 | |
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47 | void reschedule_time_watchers (); |
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48 | |
44 | // register a watcher |
49 | // register a watcher |
45 | void reg (int fd, short events, io_watcher *w); |
50 | void reg (io_watcher *w); |
46 | void unreg (const io_watcher *w); |
51 | void unreg (io_watcher *w); |
47 | void reg (time_watcher *w); |
52 | void reg (time_watcher *w); |
48 | void unreg (const time_watcher *w); |
53 | void unreg (time_watcher *w); |
49 | |
54 | |
50 | void loop (); |
55 | void loop (); |
51 | |
56 | |
52 | io_manager (); |
57 | io_manager (); |
53 | ~io_manager (); |
58 | ~io_manager (); |
54 | }; |
59 | }; |
55 | |
60 | |
56 | extern io_manager iom; |
61 | extern io_manager iom; // a singleton, together with it's construction/destruction problems. |
57 | |
62 | |
58 | template<class R, class A> |
63 | struct io_watcher : callback2<void, io_watcher &, short> { |
59 | class callback { |
64 | bool registered; // already registered? |
60 | struct object { }; |
65 | int fd; |
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66 | short events; |
61 | |
67 | |
62 | void *obj; |
68 | template<class O1, class O2> |
63 | R (object::*meth)(A arg); |
69 | io_watcher (O1 *object, void (O2::*method)(io_watcher &, short)) |
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70 | : callback2<void, io_watcher &, short>(object,method) |
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71 | , registered(false) |
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72 | { } |
64 | |
73 | |
65 | // a proxy is a kind of recipe on how to call a specific class method |
74 | ~io_watcher (); |
66 | struct proxy_base { |
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67 | virtual R call (void *obj, R (object::*meth)(A), A arg) = 0; |
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68 | }; |
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69 | template<class O1, class O2> |
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70 | struct proxy : proxy_base { |
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71 | virtual R call (void *obj, R (object::*meth)(A), A arg) |
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72 | { |
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73 | ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<R (O2::*)(A)>(meth))) |
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74 | (arg); |
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75 | } |
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76 | }; |
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77 | |
75 | |
78 | proxy_base *prxy; |
76 | void set(int fd_, short events_); |
79 | |
77 | |
80 | public: |
78 | void set(short events_) |
81 | template<class O1, class O2> |
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82 | callback (O1 *object, R (O2::*method)(A)) |
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83 | { |
79 | { |
84 | static proxy<O1,O2> p; |
80 | set (fd, events_); |
85 | obj = reinterpret_cast<void *>(object); |
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86 | meth = reinterpret_cast<R (object::*)(A)>(method); |
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87 | prxy = &p; |
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88 | } |
81 | } |
89 | |
82 | |
90 | R call(A arg) const |
83 | void start (int fd_, short events_) |
91 | { |
84 | { |
92 | return prxy->call (obj, meth, arg); |
85 | set (fd_, events_); |
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86 | iom.reg (this); |
93 | } |
87 | } |
94 | |
88 | |
95 | R operator ()(A arg) const |
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96 | { |
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97 | return call (arg); |
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98 | } |
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99 | }; |
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100 | |
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101 | struct io_watcher : callback<void, short> { |
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102 | template<class O1, class O2> |
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103 | io_watcher (O1 *object, void (O2::*method)(short revents)) |
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104 | : callback<void, short>(object,method) |
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105 | { } |
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106 | |
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107 | void start (int fd, short events) |
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108 | { |
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109 | iom.reg (fd, events, this); |
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110 | } |
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111 | |
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112 | void stop () const |
89 | void stop () |
113 | { |
90 | { |
114 | iom.unreg (this); |
91 | iom.unreg (this); |
115 | } |
92 | } |
116 | }; |
93 | }; |
117 | |
94 | |
118 | #define TSTAMP_CANCEL -1. |
95 | #define TSTAMP_CANCEL -1. |
119 | |
96 | |
120 | struct time_watcher : callback<void, tstamp &> { |
97 | struct time_watcher : callback1<void, time_watcher &> { |
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98 | bool registered; // already registered? |
121 | tstamp at; |
99 | tstamp at; |
122 | |
100 | |
123 | template<class O1, class O2> |
101 | template<class O1, class O2> |
124 | time_watcher (O1 *object, void (O2::*method)(tstamp &)) |
102 | time_watcher (O1 *object, void (O2::*method)(time_watcher &)) |
125 | : callback<void, tstamp &>(object,method) |
103 | : callback1<void, time_watcher &>(object,method) |
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104 | , registered(false) |
126 | { } |
105 | { } |
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106 | |
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107 | ~time_watcher (); |
127 | |
108 | |
128 | void set (tstamp when); |
109 | void set (tstamp when); |
129 | void trigger (); |
110 | void trigger (); |
130 | |
111 | |
131 | void operator ()() |
112 | void operator ()() |
132 | { |
113 | { |
133 | trigger (); |
114 | trigger (); |
134 | } |
115 | } |
135 | |
116 | |
136 | void start (); |
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 | |
137 | void start (tstamp when) |
122 | void start (tstamp when) |
138 | { |
123 | { |
139 | set (when); |
124 | set (when); |
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125 | iom.reg (this); |
140 | } |
126 | } |
141 | |
127 | |
142 | void stop () const |
128 | void stop () |
143 | { |
129 | { |
144 | iom.unreg (this); |
130 | iom.unreg (this); |
145 | } |
131 | } |
146 | |
132 | |
147 | void reset (tstamp when = TSTAMP_CANCEL) |
133 | void reset (tstamp when = TSTAMP_CANCEL) |