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Subject:	pthread_mutexattr_init problem
MIME-Version:	1.0
Date:	Thu, 16 Oct 2003 22:36:58 +0200
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Message-ID:	<A3D1526C98B7C1409A687E0943EAC41015E300@obelix.askesis.nl>
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From:	"Joost Kraaijeveld" <J DOT Kraaijeveld AT Askesis DOT nl>
To:	"Cygwin (E-mail)" <cygwin AT cygwin DOT com>

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Hi all,

Can anyone explain to me under what circumstances pthread_mutexattr_init
returns EBUSY? I read the explanations in
http://sources.redhat.com/ml/cygwin/2003-06/msg00431.html and
http://www.opengroup.org/onlinepubs/007904975/functions/pthread_mutexatt
r_init.html and from that I understand that  pthread_mutexattr_init
returns EBUSY if one tries to initialize twice. However I get the error
in the following part of  code (see below & the arrows on the left). The
initialization is done only once. 

Note:

If I initialize pthread_mutexattr_t m_attr with 0 (because it's actually
a pointer to a struct according to <sys/types>) the code runs OK. This
looks strange to me. Why should I have to initialize a
pthread_mutexattr_t by any other means than by calling
pthread_mutexattr_init ?

MICOMT::Mutex::Mutex(MICO_Boolean locked, Attribute attr)
{
    int result;
    pthread_mutexattr_t m_attr /* = 0 */; <-----
--> result = pthread_mutexattr_init(&m_attr);
--> assert(!result);           
    if (attr != Normal) {
	switch (attr) {
	case Recursive:
          result =
pthread_mutexattr_settype(&m_attr,PTHREAD_MUTEX_RECURSIVE);
	    assert (!result);
	    break;
	default:
	    break;
	}
    }
    result = pthread_mutex_init(&_mutex, &m_attr);
    assert(!result);
    result = pthread_mutexattr_destroy(&m_attr); 
    assert(!result);
    if (locked)
	this->lock();
}

TIA

Joost Kraaijeveld
Askesis B.V.
Molukkenstraat 14
6524NB Nijmegen
tel: 024-3888063 / 06-51855277
fax: 024-3608416
email: J DOT Kraaijeveld AT Askesis DOT nl
web: www.askesis.nl 


 

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