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From: John Polstra <jdp@FreeBSD.org>
Date: Tue, 25 Jul 2000 21:24:41 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/libexec/rtld-elf rtld.c rtld.h
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jdp         2000/07/25 21:24:41 PDT

  Modified files:
    libexec/rtld-elf     rtld.c rtld.h 
  Log:
  Revamp the code that calls shared libraries' init and fini functions.
  Formerly the init functions were called in the opposite of the
  order in which libraries were loaded, and libraries were loaded
  according to a breadth-first traversal of the dependency graph.
  That ordering came from SVR4.0, and it was easy to implement but
  not always sensible.
  
  Now we do a depth-first walk over the dependency graph and call
  the init functions in an order such that each shared object's needed
  objects are initialized before the shared object itself.  At the
  same time we build a list of finalization (fini) functions in the
  opposite order, to guarantee correct C++ destructor ordering whenever
  possible.  (It may not be possible if dlopen and dlclose are used
  in strange ways, but we come as close as one can come.)
  
  The need for this renovation has become apparent as more programs
  have started using multithreading.  The multithreaded C library
  libc_r requires initialization, whereas the standard libc does not.
  Since virtually every other object depends on the C library, it is
  important that it get initialized first.
  
  Revision  Changes    Path
  1.47      +184 -99   src/libexec/rtld-elf/rtld.c
  1.19      +3 -9      src/libexec/rtld-elf/rtld.h



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