devmap_set_ctx_timeout() specifies the time interval for the system to wait between successive calls to the driver's context management callback function, devmap_contextmgt(9E).
Device drivers typically call devmap_set_ctx_timeout() in the devmap_map(9E) routine. If the drivers do not call devmap_set_ctx_timeout() to set the timeout value, the default timeout value of 0 will result
in no delay between successive calls to the driver's devmap_contextmgt(9E) callback function.
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