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| 136 | |
136 | |
| 137 | These watchers are normal Perl objects with normal Perl lifetime. After |
137 | These watchers are normal Perl objects with normal Perl lifetime. After |
| 138 | creating a watcher it will immediately "watch" for events and invoke the |
138 | creating a watcher it will immediately "watch" for events and invoke the |
| 139 | callback when the event occurs (of course, only when the event model |
139 | callback when the event occurs (of course, only when the event model |
| 140 | is in control). |
140 | is in control). |
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141 | |
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142 | Note that B<callbacks must not permanently change global variables> |
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143 | potentially in use by the event loop (such as C<$_> or C<$[>) and that B<< |
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144 | callbacks must not C<die> >>. The former is good programming practise in |
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145 | Perl and the latter stems from the fact that exception handling differs |
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146 | widely between event loops. |
| 141 | |
147 | |
| 142 | To disable the watcher you have to destroy it (e.g. by setting the |
148 | To disable the watcher you have to destroy it (e.g. by setting the |
| 143 | variable you store it in to C<undef> or otherwise deleting all references |
149 | variable you store it in to C<undef> or otherwise deleting all references |
| 144 | to it). |
150 | to it). |
| 145 | |
151 | |
