Nero Fernandez wrote: > > On Fri, Jun 18, 2010 at 7:42 PM, Gilles Chanteperdrix > <gilles.chanteperd...@xenomai.org > <mailto:gilles.chanteperd...@xenomai.org>> wrote: > > Nero Fernandez wrote: > > Hi, > > > > Please find an archive attached, containing : > > - a program for testing context-switch-latency using posix-APIs > > for native linux kernel and xenomai-posix-skin (userspace). > > - Makefile to build it using xenomai > > Your program is very long to tell fast. But it seems you are using the > mutex as if they were recursive. Xenomai posix skin mutexes used to be > recursive by default, but no longer are. > > Also note that your code does not check the return value of the posix > skin services, which is a really bad idea. > > -- > Gilles. > > > Thanks for the prompt response. > > Could you explain 'recursive usage of mutex' a little further? > Are the xenomai pthread-mutexes very different in behaviour than regular > posix mutexes?
The posix specification does not define the default type of a mutex. So, in short, the behaviour of a "regular posix mutex" is unspecified. However, following the principle of least surprise, Xenomai chose, like Linux, to use the "normal" type by default. What is the type of a posix mutex is explained in many places, starting with Xenomai API documentation. So, no, I will not repeat it here. -- Gilles. _______________________________________________ Xenomai-core mailing list Xenomaifirstname.lastname@example.org https://mail.gna.org/listinfo/xenomai-core