Re: Mutex/Lock

From:

Chris Forone <4one@gmx.at>

Newsgroups:

comp.lang.c++

Date:

Sat, 31 May 2008 10:21:08 +0200

Message-ID:

<g1r1p7$r5m$1@newsreader2.utanet.at>

Paul Brettschneider schrieb:

Chris Forone wrote:

hello group,

is there a chance for other functions to get the lock if i have
following loop:

while (running)
{
   Lock local(mutex);
}

if not, is it enough to change scope:

while (running)
{
   {
   Lock local(mutex);
   }
}

You probably want:

{
  Lock local(mutex);
  while(running)
  {
     ...
  }
}

No, the first version is the one i need. its to suspend/resume in a well
defined position in code. So i had:

bool Resume()
{
   Lock local(mutex);
   // resume thread
}

bool Suspend()
{
   Lock local(mutex);
   // suspend thread
}

bool Exit()
{
   Lock local(mutex);
   // here was my dl, because of wait for thread termination :-)
}

void Proc()
{
   while (active)
   {
     Lock local(mutex);
     // do things
   }
}

now my Exit looks:

bool Exit()
{
   mutex.Acquire();

   if (active)
   {
     active = false, mutex.Release();
     // wait for thread termination :-)))
   }

   mutex.Release();
}

it functs, hope it is waterproof...

thanks & hand, chris

ps: Ideas for better doing it are very welcome!

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