[LC++]Why doesn't PTHREAD_MUTEX_INITIALIZER work my constructor?

[David Filion]

Hello, 

I have created a class that contains a phtread mutex that I want
to initialize in the class constructor.

If I use:
	mutex = PTHREAD_MUTEX_INITIALIZER;
in the class contructor I get a compilation error. If I use:
	pthread_mutex_init (&mutex, NULL);
it works.

Example:
========== Thread.h: =============

#ifndef TRY_H
#define TRY_H
#include <pthread.h>

class Threads {
private:
	pthread_mutex_t mutex;
	long somevar;

public:
	Threads ();
	int lock ();
	int unlock ();
};
#endif

========== End Thread.h ===========

========== Start Thread.cc =========

#include "Threads.h"


Threads::Threads ()
{
	// This return a compilation error of:
	// Threads.cc: In method `Threads::Threads()':
	// Threads.cc:6: parse error before `{'
	//
	//mutex = PTHREAD_MUTEX_INITIALIZER;

	// This works.
	pthread_mutex_init (&mutex, NULL);
}


int Threads::lock ()
{
	return (pthread_mutex_lock (&mutex));
}

int Threads::unlock ()
{
	return (pthread_mutex_unlock (&mutex));
}

========== End Thread.cc =========

Why is that? Does it have to do with the fact that 
the mutex is being initialized at runtime instead 
of at the time of compilation? If that is the case
why am I getting a syntax error and some kind of 
linking error?

System:
Slackware 8.1
g++ 2.95.3
glibc 2.2.5

Thanks
David Filion