1 | /* |
1 | /* |
2 | iom.C -- generic I/O multiplexor |
2 | iom.C -- 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 | #include "../config.h" |
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21 | |
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22 | #include <cstdio> |
20 | #include <cstdio> |
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21 | #include <cstdlib> |
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22 | #include <cerrno> |
23 | |
23 | |
24 | #include <sys/select.h> |
24 | #include <sys/select.h> |
25 | #include <sys/time.h> |
25 | #include <sys/time.h> |
26 | |
26 | |
27 | #include "iom.h" |
27 | #include "iom.h" |
28 | |
28 | |
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29 | // TSTAMP_MAX must still fit into a positive struct timeval |
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30 | #define TSTAMP_MAX (double)(1UL<<31) |
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31 | |
29 | tstamp NOW; |
32 | tstamp NOW; |
30 | bool iom_valid; |
33 | static bool iom_valid; |
31 | io_manager iom; |
34 | io_manager iom; |
32 | |
35 | |
33 | template<class watcher> |
36 | template<class watcher> |
34 | void io_manager::reg (watcher *w, simplevec<watcher *> &queue) |
37 | void io_manager::reg (watcher *w, io_manager_vec<watcher> &queue) |
35 | { |
38 | { |
36 | if (find (queue.begin (), queue.end (), w) == queue.end ()) |
39 | if (!iom_valid) |
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40 | abort (); |
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41 | |
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42 | if (!w->active) |
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43 | { |
37 | queue.push_back (w); |
44 | queue.push_back (w); |
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45 | w->active = queue.size (); |
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46 | } |
38 | } |
47 | } |
39 | |
48 | |
40 | template<class watcher> |
49 | template<class watcher> |
41 | void io_manager::unreg (watcher *w, simplevec<watcher *> &queue) |
50 | void io_manager::unreg (watcher *w, io_manager_vec<watcher> &queue) |
42 | { |
51 | { |
43 | queue.erase (find (queue.begin (), queue.end (), w)); |
52 | if (!iom_valid) |
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53 | return; |
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54 | |
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55 | if (w->active) |
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56 | { |
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57 | queue [w->active - 1] = 0; |
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58 | w->active = 0; |
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59 | } |
44 | } |
60 | } |
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61 | |
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62 | #if IOM_TIME |
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63 | void time_watcher::trigger () |
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64 | { |
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65 | call (*this); |
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66 | |
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67 | iom.reg (this); |
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68 | } |
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69 | |
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70 | void io_manager::reg (time_watcher *w) { reg (w, tw); } |
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71 | void io_manager::unreg (time_watcher *w) { unreg (w, tw); } |
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72 | #endif |
45 | |
73 | |
46 | #if IOM_IO |
74 | #if IOM_IO |
47 | io_watcher::~io_watcher () |
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48 | { |
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49 | if (iom_valid) |
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50 | iom.unreg (this); |
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51 | } |
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52 | |
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53 | void io_manager::reg (io_watcher *w) |
75 | void io_manager::reg (io_watcher *w) { reg (w, iow); } |
54 | { |
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55 | reg (w, iow); |
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56 | } |
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57 | |
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58 | void io_manager::unreg (io_watcher *w) |
76 | void io_manager::unreg (io_watcher *w) { unreg (w, iow); } |
59 | { |
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60 | unreg (w, iow); |
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61 | } |
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62 | |
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63 | #endif |
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64 | |
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65 | #if IOM_TIME |
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66 | void time_watcher::trigger () |
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67 | { |
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68 | call (*this); |
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69 | |
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70 | iom.reg (this); |
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71 | } |
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72 | |
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73 | time_watcher::~time_watcher () |
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74 | { |
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75 | if (iom_valid) |
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76 | iom.unreg (this); |
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77 | |
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78 | at = TSTAMP_CANCEL; |
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79 | } |
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80 | |
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81 | void io_manager::reg (time_watcher *w) |
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82 | { |
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83 | reg (w, tw); |
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84 | } |
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85 | |
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86 | void io_manager::unreg (time_watcher *w) |
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87 | { |
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88 | unreg (w, tw); |
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89 | } |
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90 | #endif |
77 | #endif |
91 | |
78 | |
92 | #if IOM_CHECK |
79 | #if IOM_CHECK |
93 | check_watcher::~check_watcher () |
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94 | { |
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95 | if (iom_valid) |
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96 | iom.unreg (this); |
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97 | } |
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98 | |
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99 | void io_manager::reg (check_watcher *w) |
80 | void io_manager::reg (check_watcher *w) { reg (w, cw); } |
100 | { |
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101 | reg (w, cw); |
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102 | } |
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103 | |
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104 | void io_manager::unreg (check_watcher *w) |
81 | void io_manager::unreg (check_watcher *w) { unreg (w, cw); } |
105 | { |
82 | #endif |
106 | unreg (w, cw); |
83 | |
107 | } |
84 | #if IOM_IDLE |
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85 | void io_manager::reg (idle_watcher *w) { reg (w, iw); } |
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86 | void io_manager::unreg (idle_watcher *w) { unreg (w, iw); } |
108 | #endif |
87 | #endif |
109 | |
88 | |
110 | #if IOM_TIME |
89 | #if IOM_TIME |
111 | inline void set_now (void) |
90 | inline void set_now (void) |
112 | { |
91 | { |
… | |
… | |
124 | set_now (); |
103 | set_now (); |
125 | #endif |
104 | #endif |
126 | |
105 | |
127 | for (;;) |
106 | for (;;) |
128 | { |
107 | { |
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108 | struct timeval *to = 0; |
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109 | struct timeval tval; |
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110 | |
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111 | #if IOM_IDLE |
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112 | if (iw.size ()) |
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113 | { |
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114 | tval.tv_sec = 0; |
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115 | tval.tv_usec = 0; |
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116 | to = &tval; |
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117 | } |
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118 | else |
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119 | #endif |
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120 | { |
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121 | #if IOM_TIME |
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122 | time_watcher *next; |
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123 | |
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124 | for (;;) |
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125 | { |
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126 | next = tw[0]; // the first time-watcher must exist at ALL times |
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127 | |
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128 | for (int i = tw.size (); i--; ) |
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129 | if (!tw[i]) |
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130 | tw.erase_unordered (i); |
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131 | else if (tw[i]->at < next->at) |
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132 | next = tw[i]; |
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133 | |
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134 | if (next->at > NOW) |
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135 | { |
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136 | if (next != tw[0]) |
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137 | { |
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138 | double diff = next->at - NOW; |
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139 | tval.tv_sec = (int)diff; |
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140 | tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); |
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141 | to = &tval; |
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142 | } |
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143 | break; |
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144 | } |
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145 | else |
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146 | { |
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147 | unreg (next); |
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148 | next->call (*next); |
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149 | } |
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150 | } |
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151 | #endif |
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152 | } |
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153 | |
129 | #if IOM_CHECK |
154 | #if IOM_CHECK |
130 | for (int i = 0; i < cw.size (); ++i) |
155 | for (int i = cw.size (); i--; ) |
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156 | if (!cw[i]) |
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157 | cw.erase_unordered (i); |
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158 | else |
131 | cw[i]->call (*cw[i]); |
159 | cw[i]->call (*cw[i]); |
132 | #endif |
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133 | |
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134 | struct timeval *to = 0; |
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135 | |
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136 | #if IOM_TIME |
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137 | struct timeval tval; |
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138 | time_watcher *w; |
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139 | |
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140 | for (;tw.size ();) |
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141 | { |
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142 | w = tw[0]; |
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143 | |
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144 | for (time_watcher **i = tw.begin (); i < tw.end (); ++i) |
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145 | if ((*i)->at < w->at) |
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146 | w = *i; |
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147 | |
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148 | if (w->at > NOW) |
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149 | { |
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150 | double diff = w->at - NOW; |
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151 | tval.tv_sec = (int)diff; |
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152 | tval.tv_usec = (int)((diff - tval.tv_sec) * 1000000); |
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153 | to = &tval; |
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154 | break; |
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155 | } |
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156 | else if (w->at >= 0) |
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157 | w->call (*w); |
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158 | else |
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159 | unreg (w); |
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160 | } |
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161 | #endif |
160 | #endif |
162 | |
161 | |
163 | #if IOM_IO |
162 | #if IOM_IO |
164 | fd_set rfd, wfd; |
163 | fd_set rfd, wfd, efd; |
165 | |
164 | |
166 | FD_ZERO (&rfd); |
165 | FD_ZERO (&rfd); |
167 | FD_ZERO (&wfd); |
166 | FD_ZERO (&wfd); |
168 | |
167 | |
169 | int fds = 0; |
168 | int fds = 0; |
170 | |
169 | |
171 | for (io_watcher **w = iow.begin (); w < iow.end (); ++w) |
170 | for (io_manager_vec<io_watcher>::iterator i = iow.end (); i-- > iow.begin (); ) |
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171 | if (*i) |
172 | { |
172 | { |
173 | if ((*w)->events & EVENT_READ ) FD_SET ((*w)->fd, &rfd); |
173 | if ((*i)->events & EVENT_READ ) FD_SET ((*i)->fd, &rfd); |
174 | if ((*w)->events & EVENT_WRITE) FD_SET ((*w)->fd, &wfd); |
174 | if ((*i)->events & EVENT_WRITE) FD_SET ((*i)->fd, &wfd); |
175 | |
175 | |
176 | if ((*w)->fd >= fds) fds = (*w)->fd + 1; |
176 | if ((*i)->fd >= fds) fds = (*i)->fd + 1; |
177 | } |
177 | } |
178 | |
178 | |
179 | if (!to && !fds) |
179 | if (!to && !fds) //TODO: also check idle_watchers and check_watchers |
180 | break; // no events |
180 | break; // no events |
181 | |
181 | |
182 | fds = select (fds, &rfd, &wfd, 0, to); |
182 | fds = select (fds, &rfd, &wfd, &efd, to); |
183 | # if IOM_TIME |
183 | # if IOM_TIME |
184 | set_now (); |
184 | set_now (); |
185 | # endif |
185 | # endif |
186 | |
186 | |
187 | if (fds > 0) |
187 | if (fds > 0) |
188 | for (int i = 0; i < iow.size (); ++i) |
188 | for (int i = iow.size (); i--; ) |
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189 | if (!iow[i]) |
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190 | iow.erase_unordered (i); |
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191 | else |
189 | { |
192 | { |
190 | io_watcher *w = iow[i]; |
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191 | |
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192 | short revents = w->events; |
193 | short revents = iow[i]->events; |
193 | |
194 | |
194 | if (!FD_ISSET (w->fd, &rfd)) revents &= ~EVENT_READ; |
195 | if (!FD_ISSET (iow[i]->fd, &rfd)) revents &= ~EVENT_READ; |
195 | if (!FD_ISSET (w->fd, &wfd)) revents &= ~EVENT_WRITE; |
196 | if (!FD_ISSET (iow[i]->fd, &wfd)) revents &= ~EVENT_WRITE; |
196 | |
197 | |
197 | if (revents) |
198 | if (revents) |
198 | w->call (*w, revents); |
199 | iow[i]->call (*iow[i], revents); |
199 | } |
200 | } |
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201 | else if (fds < 0 && errno != EINTR) |
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202 | { |
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203 | perror ("Error while waiting for I/O or time event"); |
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204 | abort (); |
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205 | } |
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206 | #if IOM_IDLE |
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207 | else |
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208 | for (int i = iw.size (); i--; ) |
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209 | if (!iw[i]) |
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210 | iw.erase_unordered (i); |
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211 | else |
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212 | iw[i]->call (*iw[i]); |
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213 | #endif |
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214 | |
200 | #elif IOM_TIME |
215 | #elif IOM_TIME |
201 | if (!to) |
216 | if (!to) |
202 | break; |
217 | break; |
203 | |
218 | |
204 | select (0, 0, 0, 0, &to); |
219 | select (0, 0, 0, 0, &to); |
… | |
… | |
207 | break; |
222 | break; |
208 | #endif |
223 | #endif |
209 | } |
224 | } |
210 | } |
225 | } |
211 | |
226 | |
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227 | // this is a dummy time watcher to ensure that the first |
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228 | // time watcher is _always_ valid, this gets rid of a lot |
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229 | // of null-pointer-checks |
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230 | static struct tw0 : time_watcher { |
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231 | void cb (time_watcher &w) |
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232 | { |
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233 | // should never get called |
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234 | // reached end-of-time, or tstamp has a bogus definition :) |
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235 | abort (); |
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236 | } |
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237 | |
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238 | tw0() |
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239 | : time_watcher (this, &tw0::cb) |
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240 | { } |
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241 | } tw0; |
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242 | |
212 | io_manager::io_manager () |
243 | io_manager::io_manager () |
213 | { |
244 | { |
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245 | iom_valid = true; |
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246 | |
214 | #if IOM_TIME |
247 | #if IOM_TIME |
215 | set_now (); |
248 | set_now (); |
216 | #endif |
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217 | |
249 | |
218 | iom_valid = true; |
250 | tw0.start (TSTAMP_MAX); |
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251 | #endif |
219 | } |
252 | } |
220 | |
253 | |
221 | io_manager::~io_manager () |
254 | io_manager::~io_manager () |
222 | { |
255 | { |
223 | iom_valid = false; |
256 | iom_valid = false; |