Re: MSI interrupts

On 3/24/2025 1:14 PM, Dan Cross wrote:

In article <vrsaro$1faj3$9@dont-email.me>,
Chris M. Thomasson <chris.m.thomasson.1@gmail.com> wrote:

On 3/24/2025 11:49 AM, Dan Cross wrote:

[snip]
I'm sure one could do a lockless pop using a cmp exchange, but I
wanted to a scenario where one would want to hold onto both
locks throughout the critical section for some reason.
I just don't see how this works in the proposed scenario.

>
You want to hold lock A while lock B us being used? That can be tricky.

 Really?  This happens all the time.  Of course it can be tricky,
as concurrent programming always is, but it's incredibly normal.

Locking order comes into play here. Uggg... I have seen nightmare code that was using recursion as well... It deadlocked at a certain depth, only under the right conditions. The locking order was not properly respected...

 

Well, there is a locking order. Check out this older work of mine, multex:
>
https://groups.google.com/g/comp.lang.c++/c/sV4WC_cBb9Q/m/SkSqpSxGCAAJ
>
Not sure if this is relevant or not.

 It doesn't appear to be; sorry.
  - Dan C.