(flex.info)Reentrant

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19 Reentrant C Scanners
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'flex' has the ability to generate a reentrant C scanner.  This is
accomplished by specifying '%option reentrant' ('-R') The generated
scanner is both portable, and safe to use in one or more separate
threads of control.  The most common use for reentrant scanners is from
within multi-threaded applications.  Any thread may create and execute a
reentrant 'flex' scanner without the need for synchronization with other
threads.

Reentrant Uses

Reentrant Overview

Reentrant Example

Reentrant Detail

Reentrant Functions