pthread_mutex_trylock does not lock

[Christophe Galerne]

Robert Collins wrote:
 > On Tue, 2002-12-03 at 23:06, Chris Knight wrote:
 > > Hello Rob,
 > >
 > > I have changed the code, see below.  I now set the type to
 > > PTHREAD_MUTEX_NORMAL but that also does not block.  The only documentation
 > > on cygwin threads say this is the same as PTHREAD_MUTEX_FAST_NP
 >
 > What documentation says that?

This
www.opengroup.org/onlinepubs/7908799/xsh/pthread_mutexattr_settype.html
seems to explain that a PT_MUTEX_NORMAL mutex should behave the way Chris
expect.

If this doc is out-of-date, could you give a pointer to a more accurate
source?

 > We don't support NONRECURSIVE mutex's. I don't know what you mean by
 > NORECURSIVE threads.

Then maybe one should add a comment above
pthread.h(55): #define PTHREAD_MUTEX_NORMAL 2
that this option is not supported.

Also above
pthread.h(57): #define PTHREAD_MUTEX_INITIALIZER (void *)20
a comment that says that a default MUTEX will be recursive
might avoid some surprise. =:-D

Thanks,
Christophe

PS: Could you cc me as I am not on the list? Thanks.


--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/