Hi I have a THREAD class that uses the static variable NextThreadID to
store the id of the next thread to be created and a static Mutex to
protect it.
class THREAD {
public:
int Start(void);
private:
unsigned int ThreadID;
// Will be coppied into ThreadID when a new thread is started
and then incremented by1
static unsigned int NextThreadID;
static MUTEX Mutex;
};
int THREAD::Start(v oid) {
// Start a new thread
Mutex.Acquire() ;
ThreadID = NextThreadID;
NextThreadID++;
Mutex.Release() ;
if (ThreadStarted)
{
return 1;
}
else
{
return 0;
}
}
At the moment I initialize NextThreadID and Mutex before main() and set
it equal to zero. Is there a cleaner way to initalize these objects?
Obviously I cant do it in the THREAD object itself because several
threads may try to initalize the same object at the same time.
I have read
http://www-d0.fnal.gov/KAI/doc/tutor...alization.html
which kind of explains what I am trying to.
extern unsigned int THREAD::NextThr eadID;
extern MUTEX THREAD::Mutex;
class nifty_counter {
static int count;
public:
nifty_counter()
{
if (count++ == 0) {
// initialize the NextThreadID and its protector
Mutex
THREAD::NextThr eadID = 0;
THREAD::Mutex;
}
}
~nifty_counter( )
{
if (--count == 0) {
// clean up obj1 ... objn
}
}
};
//Now every file that includes the library header also creates
a nifty_counter object and initializes it with the effect of increasing
nifty_counter
static nifty_counter nifty;
However even if i declare the nifty class a friend of the THREAD class
I get the compile time error that THREAD::Mutex and
THREAD::NextThr eadID member cannot be declared here.
