IO21162: JAVA POS PIPE READ HANG

APAR status

• Closed as program error.

Error description

• A CBASIC program create a POS pipe, and a Java program uses the
  POSFile.read() method to read from the pipe.  If the CBASIC
  program is terminated, the POSFile.read() method hang
  indefinitely
  

Local fix

Problem summary

•  When using the POSFile class for a POS pipe, it
  was not possible to break out of a POSFile.read(), if the write
  end of the pipe was closed.  It was also not possible to avoid
  the POSFile.read(), if it was going to block.
  

Problem conclusion

•  The POSFile.length() method was modified to
  behave differently.  When the POSFile refers to a POS pipe, the
  POSFile.length() method returns the number of bytes available
  for a read.  To avoid blocking reads, the Java porgram can first
  verify that the POSFile.length() returns a positive number.
  
  PSEUDOCODE:
     while (READING) {
       if (POSFile.length() < 1) {
         SLEEP a short time
       }
     X = POSFile.read()
     }
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IO19361

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  IBM 4690 OS V6

• Fixed component ID

  5639P7000

Applicable component levels

• R201 PSY

     UP