dev_lock() question

From: Divacky Roman (xdivac02_at_stud.fit.vutbr.cz)
Date: 09/29/05

  • Next message: Stanislav Sedov: "Re: dev_lock() question" 
    Date: Thu, 29 Sep 2005 18:55:38 +0200
To: hackers@freebsd.org

    Hi,

    dev_lock() looks this way:

    void
    dev_lock(void)
    {
            if (!mtx_initialized(&devmtx))
                    mtx_init(&devmtx, "cdev", NULL, MTX_DEF);
            mtx_lock(&devmtx);
    }

    I wonder why is the mtx_initialized checking necessary? shouldnt explicit
    initialization be sufficient?

    thnx for answer

    roman
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  • Next message: Stanislav Sedov: "Re: dev_lock() question"

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