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List:       kde-devel
Subject:    Re: KFile plugin problem !!
From:       Michael Pyne <pynm0001 () comcast ! net>
Date:       2004-07-12 13:29:21
Message-ID: 200407120929.23836.pynm0001 () comcast ! net
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On Monday 12 July 2004 09:12, Mario wrote:
> Hmm, I have to wait until readyRead is emitted, this will be hard to
> implement.

Try using QMutex, adding it to your subclass as a member variable.  For 
example, (assuming it's called m_lock):

void KFileSubclass::readyReadStdout(...)
{
   // Collect data FIRST!!
   ...

   // After everything is done, unlock the mutex
   m_lock.unlock(); // Allow execution to continue
}

void KFileSubclass::readInfo()
{
  // Get your KProcess object ready.
  ...

  // Lock the mutex.  You can't lock it again until readyReadStdout()
  // unlocks it
  m_lock.lock();

  // Start the KProcess object
  ...

  // Try to lock the Mutex again.  Once we are past this line,
  // readyReadStdout() is guaranteed to be done if it is the only
  // unlocker.
  m_lock.lock();

  // Now set the metadata fields.
  ...

  // Don't forget to unlock the mutex when done.
  m_lock.unlock();
}

I'll let you work it into the code, but the idea is to use the mutex as sort 
of a dam to keep your flow of code execution controlled.

Regards,
 - Michael Pyne
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