Re: [Qemu-devel] setjmp and longjmp in qemu

[Peter Maydell]

On 23 April 2012 01:06, Xin Tong <address@hidden> wrote:
> QEMU uses this very hard to understand setjmp and longjmp to handle
> asynchronous interrupt. what i do not understand is that say one of
> the process is doing a context switching in the guest os. tlb_flush
> gets called, what if in the middle of tlb_flush, an interrupt comes in
> ( longjmp executed ).

We don't do a longjmp for interrupts. Mostly they're used for
exceptions (eg "memory access faulted"), so they only happen
in fairly restricted contexts where it is safe to longjmp.

-- PMM