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1 | /* |
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2 | * libev simple C++ wrapper classes |
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3 | * |
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4 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without modifica- |
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8 | * tion, are permitted provided that the following conditions are met: |
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9 | * |
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10 | * 1. Redistributions of source code must retain the above copyright notice, |
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11 | * this list of conditions and the following disclaimer. |
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12 | * |
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13 | * 2. Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | * Alternatively, the contents of this file may be used under the terms of |
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29 | * the GNU General Public License ("GPL") version 2 or any later version, |
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30 | * in which case the provisions of the GPL are applicable instead of |
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31 | * the above. If you wish to allow the use of your version of this file |
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32 | * only under the terms of the GPL and not to allow others to use your |
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33 | * version of this file under the BSD license, indicate your decision |
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34 | * by deleting the provisions above and replace them with the notice |
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35 | * and other provisions required by the GPL. If you do not delete the |
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36 | * provisions above, a recipient may use your version of this file under |
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37 | * either the BSD or the GPL. |
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38 | */ |
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39 | |
1 | #ifndef EVPP_H__ |
40 | #ifndef EVPP_H__ |
2 | #define EVPP_H__ |
41 | #define EVPP_H__ |
3 | |
42 | |
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43 | #ifdef EV_H |
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44 | # include EV_H |
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45 | #else |
4 | #include "ev.h" |
46 | # include "ev.h" |
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47 | #endif |
5 | |
48 | |
6 | namespace ev { |
49 | namespace ev { |
7 | |
50 | |
8 | template<class watcher> |
51 | typedef ev_tstamp tstamp; |
9 | class callback |
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10 | { |
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11 | struct object { }; |
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12 | |
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13 | void *obj; |
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14 | void (object::*meth)(watcher &, int); |
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15 | |
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16 | /* a proxy is a kind of recipe on how to call a specific class method */ |
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17 | struct proxy_base { |
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18 | virtual void call (void *obj, void (object::*meth)(watcher &, int), watcher &w, int) const = 0; |
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19 | }; |
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20 | template<class O1, class O2> |
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21 | struct proxy : proxy_base { |
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22 | virtual void call (void *obj, void (object::*meth)(watcher &, int), watcher &w, int e) const |
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23 | { |
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24 | ((reinterpret_cast<O1 *>(obj)) ->* (reinterpret_cast<void (O2::*)(watcher &, int)>(meth))) |
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25 | (w, e); |
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26 | } |
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27 | }; |
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28 | |
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29 | proxy_base *prxy; |
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30 | |
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31 | public: |
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32 | template<class O1, class O2> |
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33 | explicit callback (O1 *object, void (O2::*method)(watcher &, int)) |
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34 | { |
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35 | static proxy<O1,O2> p; |
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36 | obj = reinterpret_cast<void *>(object); |
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37 | meth = reinterpret_cast<void (object::*)(watcher &, int)>(method); |
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38 | prxy = &p; |
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39 | } |
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40 | |
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41 | void call (watcher *w, int e) const |
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42 | { |
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43 | return prxy->call (obj, meth, *w, e); |
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44 | } |
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45 | }; |
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46 | |
52 | |
47 | enum { |
53 | enum { |
48 | UNDEF = EV_UNDEF, |
54 | UNDEF = EV_UNDEF, |
49 | NONE = EV_NONE, |
55 | NONE = EV_NONE, |
50 | READ = EV_READ, |
56 | READ = EV_READ, |
… | |
… | |
60 | FORK = EV_FORK, |
66 | FORK = EV_FORK, |
61 | EMBED = EV_EMBED, |
67 | EMBED = EV_EMBED, |
62 | ERROR = EV_ERROR, |
68 | ERROR = EV_ERROR, |
63 | }; |
69 | }; |
64 | |
70 | |
65 | typedef ev_tstamp tstamp; |
71 | template<class ev_watcher, class watcher> |
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72 | struct base : ev_watcher |
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73 | { |
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74 | #if EV_MULTIPLICITY |
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75 | EV_P; |
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76 | |
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77 | void set (EV_P) |
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78 | { |
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79 | this->EV_A = EV_A; |
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80 | } |
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81 | #endif |
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82 | |
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83 | base () |
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84 | { |
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85 | ev_init (this, 0); |
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86 | } |
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87 | |
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88 | void set_ (void *data, void (*cb)(EV_P_ ev_watcher *w, int revents)) |
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89 | { |
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90 | this->data = data; |
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91 | ev_set_cb (static_cast<ev_watcher *>(this), cb); |
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92 | } |
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93 | |
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94 | // method callback |
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95 | template<class K, void (K::*method)(watcher &w, int)> |
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96 | void set (K *object) |
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97 | { |
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98 | set_ (object, method_thunk<K, method>); |
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99 | } |
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100 | |
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101 | template<class K, void (K::*method)(watcher &w, int)> |
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102 | static void method_thunk (EV_P_ ev_watcher *w, int revents) |
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103 | { |
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104 | K *obj = static_cast<K *>(w->data); |
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105 | (obj->*method) (*static_cast<watcher *>(w), revents); |
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106 | } |
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107 | |
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108 | // const method callback |
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109 | template<class K, void (K::*method)(watcher &w, int) const> |
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110 | void set (const K *object) |
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111 | { |
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112 | set_ (object, const_method_thunk<K, method>); |
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113 | } |
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114 | |
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115 | template<class K, void (K::*method)(watcher &w, int) const> |
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116 | static void const_method_thunk (EV_P_ ev_watcher *w, int revents) |
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117 | { |
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118 | K *obj = static_cast<K *>(w->data); |
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119 | (static_cast<K *>(w->data)->*method) (*static_cast<watcher *>(w), revents); |
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120 | } |
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121 | |
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122 | // function callback |
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123 | template<void (*function)(watcher &w, int)> |
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124 | void set (void *data = 0) |
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125 | { |
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126 | set_ (data, function_thunk<function>); |
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127 | } |
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128 | |
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129 | template<void (*function)(watcher &w, int)> |
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130 | static void function_thunk (EV_P_ ev_watcher *w, int revents) |
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131 | { |
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132 | function (*static_cast<watcher *>(w), revents); |
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133 | } |
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134 | |
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135 | // simple callback |
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136 | template<class K, void (K::*method)()> |
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137 | void set (K *object) |
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138 | { |
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139 | set_ (object, method_noargs_thunk<K, method>); |
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140 | } |
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141 | |
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142 | template<class K, void (K::*method)()> |
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143 | static void method_noargs_thunk (EV_P_ ev_watcher *w, int revents) |
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144 | { |
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145 | K *obj = static_cast<K *>(w->data); |
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146 | (obj->*method) (); |
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147 | } |
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148 | |
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149 | void operator ()(int events = EV_UNDEF) |
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150 | { |
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151 | return ev_cb (static_cast<ev_watcher *>(this)) |
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152 | (static_cast<ev_watcher *>(this), events); |
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153 | } |
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154 | |
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155 | bool is_active () const |
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156 | { |
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157 | return ev_is_active (static_cast<const ev_watcher *>(this)); |
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158 | } |
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159 | |
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160 | bool is_pending () const |
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161 | { |
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162 | return ev_is_pending (static_cast<const ev_watcher *>(this)); |
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163 | } |
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164 | }; |
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165 | |
66 | |
166 | |
67 | inline ev_tstamp now (EV_P) |
167 | inline ev_tstamp now (EV_P) |
68 | { |
168 | { |
69 | return ev_now (EV_A); |
169 | return ev_now (EV_A); |
70 | } |
170 | } |
71 | |
171 | |
72 | #if EV_MULTIPLICITY |
172 | #if EV_MULTIPLICITY |
73 | |
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74 | #define EV_CONSTRUCT(cppstem) \ |
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75 | EV_P; \ |
173 | #define EV_CONSTRUCT \ |
76 | \ |
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77 | void set (EV_P) \ |
174 | (EV_P = EV_DEFAULT) \ |
78 | { \ |
175 | { \ |
79 | this->EV_A = EV_A; \ |
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80 | } \ |
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81 | \ |
176 | set (EV_A); \ |
82 | template<class O1, class O2> \ |
177 | } |
83 | explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int), EV_P = ev_default_loop (0)) \ |
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84 | : callback<cppstem> (object, method), EV_A (EV_A) |
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85 | |
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86 | #else |
178 | #else |
87 | |
179 | #define EV_CONSTRUCT \ |
88 | #define EV_CONSTRUCT(cppstem) \ |
180 | () \ |
89 | template<class O1, class O2> \ |
181 | { \ |
90 | explicit cppstem (O1 *object, void (O2::*method)(cppstem &, int)) \ |
182 | } |
91 | : callback<cppstem> (object, method) |
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92 | |
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93 | #endif |
183 | #endif |
94 | |
184 | |
95 | /* using a template here would require quite a bit more lines, |
185 | /* using a template here would require quite a bit more lines, |
96 | * so a macro solution was chosen */ |
186 | * so a macro solution was chosen */ |
97 | #define EV_BEGIN_WATCHER(cppstem,cstem) \ |
187 | #define EV_BEGIN_WATCHER(cppstem,cstem) \ |
98 | \ |
188 | \ |
99 | struct cppstem : ev_ ## cstem, callback<cppstem> \ |
189 | struct cppstem : base<ev_ ## cstem, cppstem> \ |
100 | { \ |
190 | { \ |
101 | EV_CONSTRUCT (cppstem) \ |
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102 | { \ |
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103 | ev_init (static_cast<ev_ ## cstem *>(this), thunk); \ |
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104 | } \ |
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105 | \ |
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106 | bool is_active () const \ |
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107 | { \ |
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108 | return ev_is_active (static_cast<const ev_ ## cstem *>(this)); \ |
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109 | } \ |
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110 | \ |
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111 | bool is_pending () const \ |
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112 | { \ |
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113 | return ev_is_pending (static_cast<const ev_ ## cstem *>(this)); \ |
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114 | } \ |
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115 | \ |
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116 | void start () \ |
191 | void start () \ |
117 | { \ |
192 | { \ |
118 | ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this)); \ |
193 | ev_ ## cstem ## _start (EV_A_ static_cast<ev_ ## cstem *>(this)); \ |
119 | } \ |
194 | } \ |
120 | \ |
195 | \ |
121 | void stop () \ |
196 | void stop () \ |
122 | { \ |
197 | { \ |
123 | ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \ |
198 | ev_ ## cstem ## _stop (EV_A_ static_cast<ev_ ## cstem *>(this)); \ |
124 | } \ |
199 | } \ |
125 | \ |
200 | \ |
126 | void operator ()(int events = EV_UNDEF) \ |
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127 | { \ |
201 | cppstem EV_CONSTRUCT \ |
128 | return call (this, events); \ |
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129 | } \ |
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130 | \ |
202 | \ |
131 | ~cppstem () \ |
203 | ~cppstem () \ |
132 | { \ |
204 | { \ |
133 | stop (); \ |
205 | stop (); \ |
134 | } \ |
206 | } \ |
135 | \ |
207 | \ |
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208 | using base<ev_ ## cstem, cppstem>::set; \ |
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209 | \ |
136 | private: \ |
210 | private: \ |
137 | \ |
211 | \ |
138 | cppstem (const cppstem &o) \ |
212 | cppstem (const cppstem &o); \ |
139 | : callback<cppstem> (this, (void (cppstem::*)(cppstem &, int))0) \ |
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140 | { /* disabled */ } \ |
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141 | \ |
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142 | void operator =(const cppstem &o) { /* disabled */ } \ |
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143 | \ |
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144 | static void thunk (EV_P_ struct ev_ ## cstem *w, int revents) \ |
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145 | { \ |
213 | \ |
146 | (*static_cast<cppstem *>(w))(revents); \ |
214 | cppstem & operator =(const cppstem &o); \ |
147 | } \ |
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148 | \ |
215 | \ |
149 | public: |
216 | public: |
150 | |
217 | |
151 | #define EV_END_WATCHER(cppstem,cstem) \ |
218 | #define EV_END_WATCHER(cppstem,cstem) \ |
152 | }; |
219 | }; |
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261 | if (active) start (); |
328 | if (active) start (); |
262 | } |
329 | } |
263 | |
330 | |
264 | void start (const char *path, ev_tstamp interval = 0.) |
331 | void start (const char *path, ev_tstamp interval = 0.) |
265 | { |
332 | { |
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333 | stop (); |
266 | set (path, interval); |
334 | set (path, interval); |
267 | start (); |
335 | start (); |
268 | } |
336 | } |
269 | |
337 | |
270 | void update () |
338 | void update () |
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286 | void set () { } |
354 | void set () { } |
287 | EV_END_WATCHER (check, check) |
355 | EV_END_WATCHER (check, check) |
288 | |
356 | |
289 | #if EV_EMBED_ENABLE |
357 | #if EV_EMBED_ENABLE |
290 | EV_BEGIN_WATCHER (embed, embed) |
358 | EV_BEGIN_WATCHER (embed, embed) |
291 | void set (struct ev_loop *loop) |
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292 | { |
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293 | int active = is_active (); |
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294 | if (active) stop (); |
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295 | ev_embed_set (static_cast<ev_embed *>(this), loop); |
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296 | if (active) start (); |
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297 | } |
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298 | |
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299 | void start (struct ev_loop *embedded_loop) |
359 | void start (struct ev_loop *embedded_loop) |
300 | { |
360 | { |
301 | set (embedded_loop); |
361 | stop (); |
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362 | ev_embed_set (static_cast<ev_embed *>(this), embedded_loop); |
302 | start (); |
363 | start (); |
303 | } |
364 | } |
304 | |
365 | |
305 | void sweep () |
366 | void sweep () |
306 | { |
367 | { |
307 | ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this)); |
368 | ev_embed_sweep (EV_A_ static_cast<ev_embed *>(this)); |
308 | } |
369 | } |
309 | EV_END_WATCHER (embed, embed) |
370 | EV_END_WATCHER (embed, embed) |
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371 | #endif |
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372 | |
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373 | #if EV_FORK_ENABLE |
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374 | EV_BEGIN_WATCHER (fork, fork) |
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375 | void set () { } |
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376 | EV_END_WATCHER (fork, fork) |
310 | #endif |
377 | #endif |
311 | |
378 | |
312 | #undef EV_CONSTRUCT |
379 | #undef EV_CONSTRUCT |
313 | #undef EV_BEGIN_WATCHER |
380 | #undef EV_BEGIN_WATCHER |
314 | #undef EV_END_WATCHER |
381 | #undef EV_END_WATCHER |