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The string cache is only very seldom written but very often read. To improve thread scaling it is faster to lock it only for write operations. So we use a shared mutex which is locked in shared mode for read operations and locked exclusively for write operations. Change-Id: I2cc742d1b9cc15c162be40ab339fa8310640bc44 Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
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