Re: [PATCH 1/1] util/oslib: Returns real thread identifier on FreeBSD and NetBSD

[David CARLIER]

Sorry it landed in the spam.

It does make things more accurate, thus a bit more than cosmetic, as
stated in the commit message, thr_self/_lwp_self represents the
current thread id in multi thread context.

For OpenBSD it is syscall(SYS_getthrid) I believe
https://man.openbsd.org/getthrid.2

On Wed, 3 Jun 2020 at 06:12, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>
> ping?
>
> On 5/26/20 9:29 AM, David CARLIER wrote:
> > From 792fbcd9114f43bd80fd1ef5b25cd9935a536f9f Mon Sep 17 00:00:00 2001
> > From: David Carlier <devnexen@gmail.com>
> > Date: Tue, 26 May 2020 08:25:26 +0100
> > Subject: [PATCH] util/oslib: Returns the real thread identifier on FreeBSD 
> > and
> >  NetBSD
> >
> > getpid is good enough in a mono thread context, however
> >  thr_self/_lwp_self reflects the real current thread identifier
> >  from a given process.
> > ---
> >  util/oslib-posix.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/util/oslib-posix.c b/util/oslib-posix.c
> > index 062236a1ab..916f1be224 100644
> > --- a/util/oslib-posix.c
> > +++ b/util/oslib-posix.c
> > @@ -48,11 +48,13 @@
> >  #ifdef __FreeBSD__
> >  #include <sys/sysctl.h>
> >  #include <sys/user.h>
> > +#include <sys/thr.h>
> >  #include <libutil.h>
> >  #endif
> >
> >  #ifdef __NetBSD__
> >  #include <sys/sysctl.h>
> > +#include <lwp.h>
> >  #endif
> >
> >  #include "qemu/mmap-alloc.h"
> > @@ -84,6 +86,13 @@ int qemu_get_thread_id(void)
> >  {
> >  #if defined(__linux__)
> >      return syscall(SYS_gettid);
> > +#elif defined(__FreeBSD__)
> > +    /* thread id is up to INT_MAX */
> > +    long tid;
> > +    thr_self(&tid);
> > +    return (int)tid;
> > +#elif defined(__NetBSD__)
> > +    return _lwp_self();
> >  #else
> >      return getpid();
> >  #endif
> >
>