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Document limits of syncronous functions 

As agreed in conversation with pull request #246
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Willem Toorop 2017-01-13 21:12:48 +01:00
parent 155ceede4c
commit bb369ec7d9
1 changed files with 12 additions and 1 deletions
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README.md
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@ -179,7 +179,18 @@ Stub mode does not support:
# Known Issues
* None
* The synchronous lookup functions will not work when new file descriptors
needed for the lookup will be larger than `FD_SETSIZE`. This is because
the synchronous functions use a "default" event loop under the hood
which is based on `select()` and thus inherits the limits that `select()` has.
If you need only slightly more file descriptors, it is possible to enlarge
the `FD_SETSIZE` with the `--with-fd-setsize=`*`size`* flag to `configure`.
To resolve, use the asynchronous functions with an event loop extension for
libevent, libev or libuv. Note that the asynchronous functions will have
the same problem when used in combination with `getdns_context_run()`, which
also uses the default event loop.
# Supported Platforms