On 16 January 2015 at 17:19, <fred.kon...@greensocs.com> wrote:
> From: KONRAD Frederic <fred.kon...@greensocs.com>
>
> This removes exit_request global and adds a variable in CPUState for this.
> Only the flag for the first cpu is used for the moment as we are still with
> one
> TCG thread.
> --- a/cpus.c
> +++ b/cpus.c
> @@ -646,10 +646,14 @@ static void cpu_handle_guest_debug(CPUState *cpu)
>
> static void cpu_signal(int sig)
> {
> + CPUState *cpu;
> if (current_cpu) {
> cpu_exit(current_cpu);
> }
> - exit_request = 1;
> +
> + CPU_FOREACH(cpu) {
> + cpu->exit_loop_request = 1;
> + }
> }
You can't do this -- this code is a signal handler so it could
get run at any time including while the list of CPUs is being
updated. (This is why we have the exit_request flag in the
first place rather than just setting the exit_request flag in
each CPU...)
Possibly you want exit_request to be a per-thread variable,
but I haven't thought much about it.
> --- a/include/qom/cpu.h
> +++ b/include/qom/cpu.h
> @@ -249,6 +249,7 @@ struct CPUState {
> bool created;
> bool stop;
> bool stopped;
> + volatile sig_atomic_t exit_loop_request;
> volatile sig_atomic_t exit_request;
> uint32_t interrupt_request;
> int singlestep_enabled;
This would duplicate the exit_request and
exit_loop_request flags in the CPU, which is kind of odd.
-- PMM
