[#BloombergLP-bdlmt-FixedThreadPool-start]
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Spawn threads until there are `numThreads()` processing threads&period; On success, enable enqueuing and return 0&period; Otherwise, join all threads (ensuring `false &equals;&equals; isStarted()`) and return &hyphen;1&period; If the thread pool was already started (`isStarted()` is `true`), this method has no effect&period;

== Synopsis

Declared in `&lt;bdlmt&lowbar;fixedthreadpool&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
start();
----


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