1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | AnyEvent - provide framework for multiple event loops |
3 | AnyEvent - provide framework for multiple event loops |
4 | |
4 | |
5 | Event, Coro, Glib, Tk - various supported event loops |
5 | Event, Coro, Glib, Tk, Perl - various supported event loops |
6 | |
6 | |
7 | =head1 SYNOPSIS |
7 | =head1 SYNOPSIS |
8 | |
8 | |
9 | use AnyEvent; |
9 | use AnyEvent; |
10 | |
10 | |
11 | my $w = AnyEvent->io (fh => ..., poll => "[rw]+", cb => sub { |
11 | my $w = AnyEvent->io (fh => $fh, poll => "r|w", cb => sub { |
12 | my ($poll_got) = @_; |
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13 | ... |
12 | ... |
14 | }); |
13 | }); |
15 | |
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16 | * only one io watcher per $fh and $poll type is allowed (i.e. on a socket |
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17 | you can have one r + one w or one rw watcher, not any more (limitation by |
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18 | Tk). |
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19 | |
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20 | * the C<$poll_got> passed to the handler needs to be checked by looking |
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21 | for single characters (e.g. with a regex), as it can contain more event |
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22 | types than were requested (e.g. a 'w' watcher might generate 'rw' events, |
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23 | limitation by Glib). |
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24 | |
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25 | * AnyEvent will keep filehandles alive, so as long as the watcher exists, |
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26 | the filehandle exists. |
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27 | |
14 | |
28 | my $w = AnyEvent->timer (after => $seconds, cb => sub { |
15 | my $w = AnyEvent->timer (after => $seconds, cb => sub { |
29 | ... |
16 | ... |
30 | }); |
17 | }); |
31 | |
18 | |
32 | * io and time watchers get canceled whenever $w is destroyed, so keep a copy |
19 | my $w = AnyEvent->condvar; # stores wether a condition was flagged |
33 | |
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34 | * timers can only be used once and must be recreated for repeated |
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35 | operation (limitation by Glib and Tk). |
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36 | |
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37 | my $w = AnyEvent->condvar; # kind of main loop replacement |
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38 | $w->wait; # enters main loop till $condvar gets ->broadcast |
20 | $w->wait; # enters "main loop" till $condvar gets ->broadcast |
39 | $w->broadcast; # wake up current and all future wait's |
21 | $w->broadcast; # wake up current and all future wait's |
40 | |
22 | |
41 | * condvars are used to give blocking behaviour when neccessary. Create |
23 | =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT) |
42 | a condvar for any "request" or "event" your module might create, C<< |
24 | |
43 | ->broadcast >> it when the event happens and provide a function that calls |
25 | Glib, POE, IO::Async, Event... CPAN offers event models by the dozen |
44 | C<< ->wait >> for it. See the examples below. |
26 | nowadays. So what is different about AnyEvent? |
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27 | |
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28 | Executive Summary: AnyEvent is I<compatible>, AnyEvent is I<free of |
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29 | policy> and AnyEvent is I<small and efficient>. |
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30 | |
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31 | First and foremost, I<AnyEvent is not an event model> itself, it only |
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32 | interfaces to whatever event model the main program happens to use in a |
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33 | pragmatic way. For event models and certain classes of immortals alike, |
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34 | the statement "there can only be one" is a bitter reality, and AnyEvent |
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35 | helps hiding the differences. |
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36 | |
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37 | The goal of AnyEvent is to offer module authors the ability to do event |
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38 | programming (waiting for I/O or timer events) without subscribing to a |
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39 | religion, a way of living, and most importantly: without forcing your |
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40 | module users into the same thing by forcing them to use the same event |
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41 | model you use. |
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42 | |
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43 | For modules like POE or IO::Async (which is actually doing all I/O |
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44 | I<synchronously>...), using them in your module is like joining a |
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45 | cult: After you joined, you are dependent on them and you cannot use |
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46 | anything else, as it is simply incompatible to everything that isn't |
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47 | itself. |
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48 | |
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49 | AnyEvent + POE works fine. AnyEvent + Glib works fine. AnyEvent + Tk |
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50 | works fine etc. etc. but none of these work together with the rest: POE |
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51 | + IO::Async? no go. Tk + Event? no go. If your module uses one of |
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52 | those, every user of your module has to use it, too. If your module |
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53 | uses AnyEvent, it works transparently with all event models it supports |
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54 | (including stuff like POE and IO::Async). |
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55 | |
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56 | In addition of being free of having to use I<the one and only true event |
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57 | model>, AnyEvent also is free of bloat and policy: with POE or similar |
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58 | modules, you get an enourmous amount of code and strict rules you have |
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59 | to follow. AnyEvent, on the other hand, is lean and to the point by only |
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60 | offering the functionality that is useful, in as thin as a wrapper as |
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61 | technically possible. |
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62 | |
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63 | Of course, if you want lots of policy (this can arguably be somewhat |
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64 | useful) and you want to force your users to use the one and only event |
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65 | model, you should I<not> use this module. |
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66 | |
45 | |
67 | |
46 | =head1 DESCRIPTION |
68 | =head1 DESCRIPTION |
47 | |
69 | |
48 | L<AnyEvent> provides an identical interface to multiple event loops. This |
70 | L<AnyEvent> provides an identical interface to multiple event loops. This |
49 | allows module authors to utilizy an event loop without forcing module |
71 | allows module authors to utilise an event loop without forcing module |
50 | users to use the same event loop (as only a single event loop can coexist |
72 | users to use the same event loop (as only a single event loop can coexist |
51 | peacefully at any one time). |
73 | peacefully at any one time). |
52 | |
74 | |
53 | The interface itself is vaguely similar but not identical to the Event |
75 | The interface itself is vaguely similar but not identical to the Event |
54 | module. |
76 | module. |
… | |
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56 | On the first call of any method, the module tries to detect the currently |
78 | On the first call of any method, the module tries to detect the currently |
57 | loaded event loop by probing wether any of the following modules is |
79 | loaded event loop by probing wether any of the following modules is |
58 | loaded: L<Coro::Event>, L<Event>, L<Glib>, L<Tk>. The first one found is |
80 | loaded: L<Coro::Event>, L<Event>, L<Glib>, L<Tk>. The first one found is |
59 | used. If none is found, the module tries to load these modules in the |
81 | used. If none is found, the module tries to load these modules in the |
60 | order given. The first one that could be successfully loaded will be |
82 | order given. The first one that could be successfully loaded will be |
61 | used. If still none could be found, it will issue an error. |
83 | used. If still none could be found, AnyEvent will fall back to a pure-perl |
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84 | event loop, which is also not very efficient. |
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85 | |
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86 | Because AnyEvent first checks for modules that are already loaded, loading |
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87 | an Event model explicitly before first using AnyEvent will likely make |
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88 | that model the default. For example: |
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89 | |
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90 | use Tk; |
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91 | use AnyEvent; |
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92 | |
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93 | # .. AnyEvent will likely default to Tk |
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94 | |
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95 | The pure-perl implementation of AnyEvent is called |
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96 | C<AnyEvent::Impl::Perl>. Like other event modules you can load it |
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97 | explicitly. |
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98 | |
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99 | =head1 WATCHERS |
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100 | |
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101 | AnyEvent has the central concept of a I<watcher>, which is an object that |
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102 | stores relevant data for each kind of event you are waiting for, such as |
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103 | the callback to call, the filehandle to watch, etc. |
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104 | |
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105 | These watchers are normal Perl objects with normal Perl lifetime. After |
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106 | creating a watcher it will immediately "watch" for events and invoke |
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107 | the callback. To disable the watcher you have to destroy it (e.g. by |
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108 | setting the variable that stores it to C<undef> or otherwise deleting all |
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109 | references to it). |
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110 | |
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111 | All watchers are created by calling a method on the C<AnyEvent> class. |
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112 | |
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113 | =head2 IO WATCHERS |
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114 | |
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115 | You can create I/O watcher by calling the C<< AnyEvent->io >> method with |
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116 | the following mandatory arguments: |
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117 | |
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118 | C<fh> the Perl I<filehandle> (not filedescriptor) to watch for |
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119 | events. C<poll> must be a string that is either C<r> or C<w>, that creates |
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120 | a watcher waiting for "r"eadable or "w"ritable events. C<cb> the callback |
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121 | to invoke everytime the filehandle becomes ready. |
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122 | |
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123 | Only one io watcher per C<fh> and C<poll> combination is allowed (i.e. on |
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124 | a socket you can have one r + one w, not any more (limitation comes from |
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125 | Tk - if you are sure you are not using Tk this limitation is gone). |
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126 | |
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127 | Filehandles will be kept alive, so as long as the watcher exists, the |
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128 | filehandle exists, too. |
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129 | |
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130 | Example: |
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131 | |
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132 | # wait for readability of STDIN, then read a line and disable the watcher |
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133 | my $w; $w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub { |
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134 | chomp (my $input = <STDIN>); |
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135 | warn "read: $input\n"; |
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136 | undef $w; |
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137 | }); |
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138 | |
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139 | =head2 TIME WATCHERS |
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140 | |
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141 | You can create a time watcher by calling the C<< AnyEvent->timer >> |
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142 | method with the following mandatory arguments: |
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143 | |
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144 | C<after> after how many seconds (fractions are supported) should the timer |
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145 | activate. C<cb> the callback to invoke. |
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146 | |
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147 | The timer callback will be invoked at most once: if you want a repeating |
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148 | timer you have to create a new watcher (this is a limitation by both Tk |
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149 | and Glib). |
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150 | |
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151 | Example: |
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152 | |
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153 | # fire an event after 7.7 seconds |
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154 | my $w = AnyEvent->timer (after => 7.7, cb => sub { |
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155 | warn "timeout\n"; |
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156 | }); |
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157 | |
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158 | # to cancel the timer: |
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159 | undef $w; |
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160 | |
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161 | =head2 CONDITION WATCHERS |
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162 | |
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163 | Condition watchers can be created by calling the C<< AnyEvent->condvar >> |
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164 | method without any arguments. |
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165 | |
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166 | A condition watcher watches for a condition - precisely that the C<< |
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167 | ->broadcast >> method has been called. |
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168 | |
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169 | Note that condition watchers recurse into the event loop - if you have |
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170 | two watchers that call C<< ->wait >> in a round-robbin fashion, you |
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171 | lose. Therefore, condition watchers are good to export to your caller, but |
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172 | you should avoid making a blocking wait, at least in callbacks, as this |
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173 | usually asks for trouble. |
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174 | |
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175 | The watcher has only two methods: |
62 | |
176 | |
63 | =over 4 |
177 | =over 4 |
64 | |
178 | |
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179 | =item $cv->wait |
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180 | |
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181 | Wait (blocking if necessary) until the C<< ->broadcast >> method has been |
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182 | called on c<$cv>, while servicing other watchers normally. |
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183 | |
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184 | You can only wait once on a condition - additional calls will return |
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185 | immediately. |
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186 | |
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187 | Not all event models support a blocking wait - some die in that case |
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188 | (programs might want to do that so they stay interactive), so I<if you |
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189 | are using this from a module, never require a blocking wait>, but let the |
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190 | caller decide wether the call will block or not (for example, by coupling |
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191 | condition variables with some kind of request results and supporting |
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192 | callbacks so the caller knows that getting the result will not block, |
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193 | while still suppporting blocking waits if the caller so desires). |
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194 | |
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195 | Another reason I<never> to C<< ->wait >> in a module is that you cannot |
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196 | sensibly have two C<< ->wait >>'s in parallel, as that would require |
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197 | multiple interpreters or coroutines/threads, none of which C<AnyEvent> |
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198 | can supply (the coroutine-aware backends C<Coro::EV> and C<Coro::Event> |
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199 | explicitly support concurrent C<< ->wait >>'s from different coroutines, |
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200 | however). |
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201 | |
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202 | =item $cv->broadcast |
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203 | |
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204 | Flag the condition as ready - a running C<< ->wait >> and all further |
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205 | calls to C<wait> will return after this method has been called. If nobody |
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206 | is waiting the broadcast will be remembered.. |
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207 | |
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208 | Example: |
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209 | |
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210 | # wait till the result is ready |
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211 | my $result_ready = AnyEvent->condvar; |
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212 | |
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213 | # do something such as adding a timer |
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214 | # or socket watcher the calls $result_ready->broadcast |
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215 | # when the "result" is ready. |
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216 | |
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217 | $result_ready->wait; |
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218 | |
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219 | =back |
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220 | |
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221 | =head2 SIGNAL WATCHERS |
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222 | |
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223 | You can listen for signals using a signal watcher, C<signal> is the signal |
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224 | I<name> without any C<SIG> prefix. Multiple signals events can be clumped |
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225 | together into one callback invocation, and callback invocation might or |
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226 | might not be asynchronous. |
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227 | |
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228 | These watchers might use C<%SIG>, so programs overwriting those signals |
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229 | directly will likely not work correctly. |
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230 | |
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231 | Example: exit on SIGINT |
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232 | |
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233 | my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 }); |
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234 | |
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235 | =head2 CHILD PROCESS WATCHERS |
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236 | |
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237 | You can also listen for the status of a child process specified by the |
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238 | C<pid> argument (or any child if the pid argument is 0). The watcher will |
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239 | trigger as often as status change for the child are received. This works |
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240 | by installing a signal handler for C<SIGCHLD>. The callback will be called with |
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241 | the pid and exit status (as returned by waitpid). |
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242 | |
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243 | Example: wait for pid 1333 |
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244 | |
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245 | my $w = AnyEvent->child (pid => 1333, cb => sub { warn "exit status $?" }); |
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246 | |
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247 | =head1 GLOBALS |
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248 | |
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249 | =over 4 |
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250 | |
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251 | =item $AnyEvent::MODEL |
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252 | |
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253 | Contains C<undef> until the first watcher is being created. Then it |
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254 | contains the event model that is being used, which is the name of the |
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255 | Perl class implementing the model. This class is usually one of the |
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256 | C<AnyEvent::Impl:xxx> modules, but can be any other class in the case |
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257 | AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode>). |
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258 | |
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259 | The known classes so far are: |
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260 | |
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261 | AnyEvent::Impl::CoroEV based on Coro::EV, best choice. |
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262 | AnyEvent::Impl::EV based on EV (an interface to libev, also best choice). |
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263 | AnyEvent::Impl::CoroEvent based on Coro::Event, second best choice. |
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264 | AnyEvent::Impl::Event based on Event, also second best choice :) |
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265 | AnyEvent::Impl::Glib based on Glib, third-best choice. |
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266 | AnyEvent::Impl::Tk based on Tk, very bad choice. |
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267 | AnyEvent::Impl::Perl pure-perl implementation, inefficient but portable. |
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268 | |
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269 | =item AnyEvent::detect |
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270 | |
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271 | Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model if |
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272 | necessary. You should only call this function right before you would have |
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273 | created an AnyEvent watcher anyway, that is, very late at runtime. |
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274 | |
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275 | =back |
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276 | |
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277 | =head1 WHAT TO DO IN A MODULE |
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278 | |
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279 | As a module author, you should "use AnyEvent" and call AnyEvent methods |
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280 | freely, but you should not load a specific event module or rely on it. |
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281 | |
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282 | Be careful when you create watchers in the module body - Anyevent will |
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283 | decide which event module to use as soon as the first method is called, so |
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284 | by calling AnyEvent in your module body you force the user of your module |
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285 | to load the event module first. |
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286 | |
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287 | =head1 WHAT TO DO IN THE MAIN PROGRAM |
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288 | |
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289 | There will always be a single main program - the only place that should |
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290 | dictate which event model to use. |
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291 | |
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292 | If it doesn't care, it can just "use AnyEvent" and use it itself, or not |
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293 | do anything special and let AnyEvent decide which implementation to chose. |
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294 | |
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295 | If the main program relies on a specific event model (for example, in Gtk2 |
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296 | programs you have to rely on either Glib or Glib::Event), you should load |
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297 | it before loading AnyEvent or any module that uses it, generally, as early |
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298 | as possible. The reason is that modules might create watchers when they |
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299 | are loaded, and AnyEvent will decide on the event model to use as soon as |
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300 | it creates watchers, and it might chose the wrong one unless you load the |
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301 | correct one yourself. |
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302 | |
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303 | You can chose to use a rather inefficient pure-perl implementation by |
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304 | loading the C<AnyEvent::Impl::Perl> module, but letting AnyEvent chose is |
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305 | generally better. |
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306 | |
65 | =cut |
307 | =cut |
66 | |
308 | |
67 | package AnyEvent; |
309 | package AnyEvent; |
68 | |
310 | |
69 | no warnings; |
311 | no warnings; |
70 | use strict 'vars'; |
312 | use strict; |
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313 | |
71 | use Carp; |
314 | use Carp; |
72 | |
315 | |
73 | our $VERSION = '1.01'; |
316 | our $VERSION = '3.0'; |
74 | our $MODEL; |
317 | our $MODEL; |
75 | |
318 | |
76 | our $AUTOLOAD; |
319 | our $AUTOLOAD; |
77 | our @ISA; |
320 | our @ISA; |
78 | |
321 | |
79 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
322 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
80 | |
323 | |
81 | our @REGISTRY; |
324 | our @REGISTRY; |
82 | |
325 | |
83 | my @models = ( |
326 | my @models = ( |
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327 | [Coro::EV:: => AnyEvent::Impl::CoroEV::], |
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328 | [EV:: => AnyEvent::Impl::EV::], |
84 | [Coro::Event:: => AnyEvent::Impl::Coro::], |
329 | [Coro::Event:: => AnyEvent::Impl::CoroEvent::], |
85 | [Event:: => AnyEvent::Impl::Event::], |
330 | [Event:: => AnyEvent::Impl::Event::], |
86 | [Glib:: => AnyEvent::Impl::Glib::], |
331 | [Glib:: => AnyEvent::Impl::Glib::], |
87 | [Tk:: => AnyEvent::Impl::Tk::], |
332 | [Tk:: => AnyEvent::Impl::Tk::], |
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333 | [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::], |
88 | ); |
334 | ); |
89 | |
335 | |
90 | our %method = map +($_ => 1), qw(io timer condvar broadcast wait cancel DESTROY); |
336 | our %method = map +($_ => 1), qw(io timer condvar broadcast wait signal one_event DESTROY); |
91 | |
337 | |
92 | sub AUTOLOAD { |
338 | sub detect() { |
93 | $AUTOLOAD =~ s/.*://; |
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94 | |
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95 | $method{$AUTOLOAD} |
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96 | or croak "$AUTOLOAD: not a valid method for AnyEvent objects"; |
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97 | |
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98 | unless ($MODEL) { |
339 | unless ($MODEL) { |
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340 | no strict 'refs'; |
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341 | |
99 | # check for already loaded models |
342 | # check for already loaded models |
100 | for (@REGISTRY, @models) { |
343 | for (@REGISTRY, @models) { |
101 | my ($package, $model) = @$_; |
344 | my ($package, $model) = @$_; |
102 | if (${"$package\::VERSION"} > 0) { |
345 | if (${"$package\::VERSION"} > 0) { |
103 | if (eval "require $model") { |
346 | if (eval "require $model") { |
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111 | unless ($MODEL) { |
354 | unless ($MODEL) { |
112 | # try to load a model |
355 | # try to load a model |
113 | |
356 | |
114 | for (@REGISTRY, @models) { |
357 | for (@REGISTRY, @models) { |
115 | my ($package, $model) = @$_; |
358 | my ($package, $model) = @$_; |
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359 | if (eval "require $package" |
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360 | and ${"$package\::VERSION"} > 0 |
116 | if (eval "require $model") { |
361 | and eval "require $model") { |
117 | $MODEL = $model; |
362 | $MODEL = $model; |
118 | warn "AnyEvent: autoprobed and loaded model '$model', using it.\n" if $verbose > 1; |
363 | warn "AnyEvent: autoprobed and loaded model '$model', using it.\n" if $verbose > 1; |
119 | last; |
364 | last; |
120 | } |
365 | } |
121 | } |
366 | } |
122 | |
367 | |
123 | $MODEL |
368 | $MODEL |
124 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: Coro, Event, Glib or Tk."; |
369 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV (or Coro+EV), Event (or Coro+Event), Glib or Tk."; |
125 | } |
370 | } |
|
|
371 | |
|
|
372 | unshift @ISA, $MODEL; |
|
|
373 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
126 | } |
374 | } |
127 | |
375 | |
128 | @ISA = $MODEL; |
376 | $MODEL |
|
|
377 | } |
|
|
378 | |
|
|
379 | sub AUTOLOAD { |
|
|
380 | (my $func = $AUTOLOAD) =~ s/.*://; |
|
|
381 | |
|
|
382 | $method{$func} |
|
|
383 | or croak "$func: not a valid method for AnyEvent objects"; |
|
|
384 | |
|
|
385 | detect unless $MODEL; |
129 | |
386 | |
130 | my $class = shift; |
387 | my $class = shift; |
131 | $class->$AUTOLOAD (@_); |
388 | $class->$func (@_); |
132 | } |
389 | } |
133 | |
390 | |
134 | =back |
391 | package AnyEvent::Base; |
|
|
392 | |
|
|
393 | # default implementation for ->condvar, ->wait, ->broadcast |
|
|
394 | |
|
|
395 | sub condvar { |
|
|
396 | bless \my $flag, "AnyEvent::Base::CondVar" |
|
|
397 | } |
|
|
398 | |
|
|
399 | sub AnyEvent::Base::CondVar::broadcast { |
|
|
400 | ${$_[0]}++; |
|
|
401 | } |
|
|
402 | |
|
|
403 | sub AnyEvent::Base::CondVar::wait { |
|
|
404 | AnyEvent->one_event while !${$_[0]}; |
|
|
405 | } |
|
|
406 | |
|
|
407 | # default implementation for ->signal |
|
|
408 | |
|
|
409 | our %SIG_CB; |
|
|
410 | |
|
|
411 | sub signal { |
|
|
412 | my (undef, %arg) = @_; |
|
|
413 | |
|
|
414 | my $signal = uc $arg{signal} |
|
|
415 | or Carp::croak "required option 'signal' is missing"; |
|
|
416 | |
|
|
417 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
|
|
418 | $SIG{$signal} ||= sub { |
|
|
419 | $_->() for values %{ $SIG_CB{$signal} || {} }; |
|
|
420 | }; |
|
|
421 | |
|
|
422 | bless [$signal, $arg{cb}], "AnyEvent::Base::Signal" |
|
|
423 | } |
|
|
424 | |
|
|
425 | sub AnyEvent::Base::Signal::DESTROY { |
|
|
426 | my ($signal, $cb) = @{$_[0]}; |
|
|
427 | |
|
|
428 | delete $SIG_CB{$signal}{$cb}; |
|
|
429 | |
|
|
430 | $SIG{$signal} = 'DEFAULT' unless keys %{ $SIG_CB{$signal} }; |
|
|
431 | } |
|
|
432 | |
|
|
433 | # default implementation for ->child |
|
|
434 | |
|
|
435 | our %PID_CB; |
|
|
436 | our $CHLD_W; |
|
|
437 | our $CHLD_DELAY_W; |
|
|
438 | our $PID_IDLE; |
|
|
439 | our $WNOHANG; |
|
|
440 | |
|
|
441 | sub _child_wait { |
|
|
442 | while (0 < (my $pid = waitpid -1, $WNOHANG)) { |
|
|
443 | $_->($pid, $?) for (values %{ $PID_CB{$pid} || {} }), |
|
|
444 | (values %{ $PID_CB{0} || {} }); |
|
|
445 | } |
|
|
446 | |
|
|
447 | undef $PID_IDLE; |
|
|
448 | } |
|
|
449 | |
|
|
450 | sub _sigchld { |
|
|
451 | # make sure we deliver these changes "synchronous" with the event loop. |
|
|
452 | $CHLD_DELAY_W ||= AnyEvent->timer (after => 0, cb => sub { |
|
|
453 | undef $CHLD_DELAY_W; |
|
|
454 | &_child_wait; |
|
|
455 | }); |
|
|
456 | } |
|
|
457 | |
|
|
458 | sub child { |
|
|
459 | my (undef, %arg) = @_; |
|
|
460 | |
|
|
461 | defined (my $pid = $arg{pid} + 0) |
|
|
462 | or Carp::croak "required option 'pid' is missing"; |
|
|
463 | |
|
|
464 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
|
|
465 | |
|
|
466 | unless ($WNOHANG) { |
|
|
467 | $WNOHANG = eval { require POSIX; &POSIX::WNOHANG } || 1; |
|
|
468 | } |
|
|
469 | |
|
|
470 | unless ($CHLD_W) { |
|
|
471 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
|
|
472 | # child could be a zombie already, so make at least one round |
|
|
473 | &_sigchld; |
|
|
474 | } |
|
|
475 | |
|
|
476 | bless [$pid, $arg{cb}], "AnyEvent::Base::Child" |
|
|
477 | } |
|
|
478 | |
|
|
479 | sub AnyEvent::Base::Child::DESTROY { |
|
|
480 | my ($pid, $cb) = @{$_[0]}; |
|
|
481 | |
|
|
482 | delete $PID_CB{$pid}{$cb}; |
|
|
483 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
|
|
484 | |
|
|
485 | undef $CHLD_W unless keys %PID_CB; |
|
|
486 | } |
135 | |
487 | |
136 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
488 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
137 | |
489 | |
138 | If you need to support another event library which isn't directly |
490 | If you need to support another event library which isn't directly |
139 | supported by AnyEvent, you can supply your own interface to it by |
491 | supported by AnyEvent, you can supply your own interface to it by |
140 | pushing, before the first watch gets created, the package name of |
492 | pushing, before the first watcher gets created, the package name of |
141 | the event module and the package name of the interface to use onto |
493 | the event module and the package name of the interface to use onto |
142 | C<@AnyEvent::REGISTRY>. You can do that before and even without loading |
494 | C<@AnyEvent::REGISTRY>. You can do that before and even without loading |
143 | AnyEvent. |
495 | AnyEvent. |
144 | |
496 | |
145 | Example: |
497 | Example: |
146 | |
498 | |
147 | push @AnyEvent::REGISTRY, [urxvt => urxvt::anyevent::]; |
499 | push @AnyEvent::REGISTRY, [urxvt => urxvt::anyevent::]; |
148 | |
500 | |
149 | This tells AnyEvent to (literally) use the C<urxvt::anyevent::> module |
501 | This tells AnyEvent to (literally) use the C<urxvt::anyevent::> |
150 | when it finds the C<urxvt> module is loaded. When AnyEvent is loaded and |
502 | package/class when it finds the C<urxvt> package/module is loaded. When |
151 | requested to find a suitable event model, it will first check for the |
503 | AnyEvent is loaded and asked to find a suitable event model, it will |
152 | urxvt module. |
504 | first check for the presence of urxvt. |
153 | |
505 | |
|
|
506 | The class should provide implementations for all watcher types (see |
|
|
507 | L<AnyEvent::Impl::Event> (source code), L<AnyEvent::Impl::Glib> |
|
|
508 | (Source code) and so on for actual examples, use C<perldoc -m |
|
|
509 | AnyEvent::Impl::Glib> to see the sources). |
|
|
510 | |
154 | The above isn't fictitious, the I<rxvt-unicode> (a.k.a. urxvt) uses |
511 | The above isn't fictitious, the I<rxvt-unicode> (a.k.a. urxvt) |
155 | the above line exactly. An interface isn't included in AnyEvent |
512 | uses the above line as-is. An interface isn't included in AnyEvent |
156 | because it doesn't make sense outside the embedded interpreter inside |
513 | because it doesn't make sense outside the embedded interpreter inside |
157 | I<rxvt-unicode>, and it is updated and maintained as part of the |
514 | I<rxvt-unicode>, and it is updated and maintained as part of the |
158 | I<rxvt-unicode> distribution. |
515 | I<rxvt-unicode> distribution. |
|
|
516 | |
|
|
517 | I<rxvt-unicode> also cheats a bit by not providing blocking access to |
|
|
518 | condition variables: code blocking while waiting for a condition will |
|
|
519 | C<die>. This still works with most modules/usages, and blocking calls must |
|
|
520 | not be in an interactive application, so it makes sense. |
159 | |
521 | |
160 | =head1 ENVIRONMENT VARIABLES |
522 | =head1 ENVIRONMENT VARIABLES |
161 | |
523 | |
162 | The following environment variables are used by this module: |
524 | The following environment variables are used by this module: |
163 | |
525 | |