Add some documentation detailing an aspect of dialplan functions, as requested by Russell
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@77838 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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@ -33,6 +33,10 @@ Dialplan functions
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* MailboxExists converted to dialplan function
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* A new option to Dial() for telling IP phones not to count the call
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as "missed" when dial times out and cancels.
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* Added LOCK(), TRYLOCK(), and UNLOCK(), which provide a single level dialplan
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mutex. No deadlocks are possible, as LOCK() only allows a single lock to be
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held for any given channel. Also, locks are automatically freed when a
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channel is hung up.
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CLI Changes
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-----------
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@ -200,8 +200,9 @@ static struct ast_custom_function unlock_function = {
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.name = "UNLOCK",
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.synopsis = "Unlocks a named mutex",
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.desc =
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"Unlocks a previously locked mutex. Returns 1 if the channel had a lock\n"
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"or 0 otherwise.\n",
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"Unlocks a previously locked mutex. Note that it is generally unnecessary to\n"
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"unlock in a hangup routine, as any lock held is automatically freed when the\n"
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"channel is destroyed. Returns 1 if the channel had a lock or 0 otherwise.\n",
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.syntax = "UNLOCK()",
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.read = unlock_read,
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};
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