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Re: [Qemu-devel] [PULL 3/4] trace: add glib 2.32+ static GMutex support
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PULL 3/4] trace: add glib 2.32+ static GMutex support |
Date: |
Tue, 28 Jan 2014 13:01:08 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Jan 27, 2014 at 03:15:47PM +0000, Daniel P. Berrange wrote:
> On Mon, Jan 27, 2014 at 03:53:05PM +0100, Stefan Hajnoczi wrote:
> > The GStaticMutex API was deprecated in glib 2.32. We cannot switch over
> > to GMutex unconditionally since we would drop support for older glib
> > versions. But the deprecated API warnings during build are annoying so
> > use static GMutex when possible.
> >
> > Signed-off-by: Stefan Hajnoczi <address@hidden>
> > ---
> > trace/simple.c | 23 ++++++++++++++++-------
> > 1 file changed, 16 insertions(+), 7 deletions(-)
> >
> > diff --git a/trace/simple.c b/trace/simple.c
> > index 410172e..57572c4 100644
> > --- a/trace/simple.c
> > +++ b/trace/simple.c
> > @@ -40,7 +40,17 @@
> > * Trace records are written out by a dedicated thread. The thread waits
> > for
> > * records to become available, writes them out, and then waits again.
> > */
> > +#if GLIB_CHECK_VERSION(2, 32, 0)
> > +static GMutex trace_lock;
> > +#define lock_trace_lock() g_mutex_lock(&trace_lock)
> > +#define unlock_trace_lock() g_mutex_unlock(&trace_lock)
> > +#define get_trace_lock_mutex() (&trace_lock)
> > +#else
> > static GStaticMutex trace_lock = G_STATIC_MUTEX_INIT;
> > +#define lock_trace_lock() g_static_mutex_lock(&trace_lock)
> > +#define unlock_trace_lock() g_static_mutex_unlock(&trace_lock)
> > +#define get_trace_lock_mutex() g_static_mutex_get_mutex(&trace_lock)
> > +#endif
>
> coroutine-gthread.c also uses GStaticMutex - is there somewhere you
> could put some compat calls tobe shared. Perhaps some hack like
>
> #define GStaticMutex GMutex
> #define g_static_mutex_lock(m) g_mutex_lock(m)
>
> ?
I'll do a follow-up patch to pull together all the glib version
abstraction hacks we have in QEMU.
Stefan
- [Qemu-devel] [PULL 0/4] Tracing patches, Stefan Hajnoczi, 2014/01/27
- [Qemu-devel] [PULL 1/4] tracing: start trace processing thread in final child process, Stefan Hajnoczi, 2014/01/27
- [Qemu-devel] [PULL 2/4] trace: [simple] Do not include "trace/simple.h" in generated tracer headers, Stefan Hajnoczi, 2014/01/27
- [Qemu-devel] [PULL 3/4] trace: add glib 2.32+ static GMutex support, Stefan Hajnoczi, 2014/01/27
- [Qemu-devel] [PULL 4/4] trace: fix simple trace "disable" keyword, Stefan Hajnoczi, 2014/01/27
- Re: [Qemu-devel] [PULL 0/4] Tracing patches, Peter Maydell, 2014/01/31