On Jun 9, 2005, at 8:57 AM, Christopher Faylor wrote:
On Wed, Jun 08, 2005 at 03:29:46PM -0700, Peter Rehley wrote:
On Jun 8, 2005, at 2:59 PM, Thomas E. Zerucha wrote:
I have a problem similar to that of:
http://sourceware.org/ml/cygwin/2005-05/msg01400.html
I have an old system that I'm trying to port that uses pthreads, but
doesn't set the attribute, and a non-owner thread will destroy the
thread in a deallocate routine, but this won't happen (it won't
actually destroy the thread).
The problem is that (in pthread.h) PTHREAD_MUTEX_DEFAULT is .._NORMAL
on linux, the system was originally written for. It works but
eventually dies when it runs out of threads or mutexes or something
since it can't recycle. PTHREAD_MUTEX_DEFAULT is .._ERRORCHECK on
cygwin.
It would be painful to add a whole section to create an attribute
structure just to set this to be the same as linux.
If you look at the test case you will see a line that says
mutex=PTHREAD_MUTEX_INITIALIZER;
This causes the program to use the default (ERRORCHECK) mutex. To get
a normal mutex, you can use mutex=PTHREAD_NORMAL_MUTEX_INITIALIZER_NP;
However, in the test case when NORMAL is used, the mutex never gets
unlocked because the signal SIG_CHLD doesn't get to the parent.
FWIW, I've changed the default for PTHREAD_MUTEX_INITIALIZER to
PTHREAD_NORMAL_MUTEX_INITIALIZER_NP in CVS. Last night I also tried to
implement handling for interrupting mutexes based on Corinna's
explanation of what your patch did.
Shouldn't PTHREAD_MUTEX_DEFAULT be PTHREAD_MUTEX_NORMAL?
Both of these changes are in the current snapshot.
And the pthread_mutex_lock is still waiting forever...doesn't process
the signal. Looking at the code I think that the pthread_mutex::_lock
function should be using the cancelable_wait routine in place of the
WaitForSingleObject.
cgf
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Enjoy,
Peter
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