IZ39396: dlopen() problem with circular dependancies

April 2009 XL C/C++ Enterprise Edition V8.0 for AIX PTF
January 2009 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
November 2008 IBM XL C++ Runtime for AIX, V9.0
April 2009 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
July 2009 IBM XL C++ Runtime for AIX, V9.0
July 2009 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
April 2010 XL C/C++ Enterprise Edition V8.0 for AIX PTF
November 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
March 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
June 2011 XL C/C++ Enterprise Edition V8.0 for AIX PTF
July 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
July 2011 IBM XL C++ Runtime for AIX, V9.0
December 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
March 2012 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
July 2009 XL C/C++ Enterprise Edition V8.0 for AIX PTF
October 2009 XL C/C++ Enterprise Edition V8.0 for AIX PTF
January 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
May 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
August 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
June 2011 IBM XL C++ Runtime for AIX, V9.0
November 2008 XL C/C++ Enterprise Edition V8.0 for AIX PTF

APAR status

• Closed as program error.

Error description

• Programs that use dlopen() to load and initialize shared
  libaries with circular dependancies will fail when they are run
  against the V9.0 or V10.1 C++ runtimes.
  

Local fix

• n/a
  

Problem summary

• Recursive initialization of the same dynamic library.
  If during the initialization phase of libraryA, a
  dlopen() of libraryB is issued, and libraryB has a
  dependency on libraryA already being loaded,
  an infinite loop on libarayA initialization may
  occur.
  

Problem conclusion

• The compiler now recogizes this situation and does not enter an
  infinite loop.
  

Temporary fix

Comments

APAR Information

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

  IZ31917

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

Fix information

• Fixed component name

  XLC C++ AIX

• Fixed component ID

  5724S7100

Applicable component levels