Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation

Alan Cox
2005-12-15T14:56:19Z

On Iau, 2005-12-15 at 16:41 +0300, Nikita Danilov wrote:
> But this change is about fixing bugs: mutex assumes that
>
> - only owner can unlock, and
>
> - owner cannot lock (immediate self-deadlock).

So add mutex_up/mutex_down that use the same semaphores but do extra
checks if lock debugging is enabled. All you need is an owner field for
debugging.

Now generate a trace dump on up when up and to check for sleeping on a
lock you already hold (for both sem and mutex).

Alan