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C:/temp/src/j2k/Posix/Mailbox.hpp

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#ifndef __J2K__Mailbox_HPP__
#define __J2K__Mailbox_HPP__

/*
We use a Mutex to protect the Mailbox LinkList to be
used or modify by more than one message sender at a given time.
*/

#include <j2k/Fred/Standard.hpp>
#include <j2k/445/DList_pchar.hpp>
#include <j2k/445/Posix/Mutex.hpp>

class Mailbox {
public:
  Mailbox() {
    queue = new DList_pchar();
  }

  void send( char* item ) {
    mutex0.lock();
    queue.append( item );
    mutex0.unlock();
  }

  char* receive() {
    char* item = NULL;
    mutex0.lock();
    if ( queue.size() != 0 ) {
      queue.setFirst();
      item = queue.remove();
    }
    mutex0.unlock();
    return item;
  }

private:
  // N.B.:  We cannot use RWLock, since read actions may modify the list.
  Mutex mutex0;   
  DList_pchar* queue;
};

#endif

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