Reader Write Problem

semaphore readMutex=1

semaphore writeMutex=1

semaphore allowOneReader=1

int readcount=0

int writecount=0

semaphore readMain=1

semaphore writeMain=1

Reader protocol to read

allowOneReader.wait( );  

readMain.wait();  

 readMutex.wait();

     readcount++;

      if ( readcount == 1 )

         writeMain.wait();

 readMutex.signal();  

 readMain.signal();  

allowOnereader.signal();

<reader critical section>.

readMutex.wait();

readcount--;

if ( readcount == 0 )

      writeMain.signal();

readMutex.signal();

Writer protocol to write

writeMuex.wait();

   writecount++;

   if ( writecount == 1 )

          readMain.wait();

wrietMutex.signal();

writeMain.wait();

<writer critical section>;

wrietMain.signal();

wrietMutex.wait();

writecount--;

if ( writecount == 0 )

      readMain.signal();

writeMuex.signal();