OpenXM_contrib/gc/README.solaris2 - diff

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version 1.1.1.1, 1999/11/27 10:58:32

version 1.1.1.2, 2000/12/01 14:48:28

Line 37 a thread stack. If you know that you will only be run

or later, it should be possible to fix this by compiling the collector

with -DSOLARIS23_MPROTECT_BUG_FIXED.

Jeremy Fitzhardinge points out that there is a problem with the dlopen

Since 5.0 alpha5, dlopen disables collection temporarily,

replacement, in that startup code in the library is run while the allocation

unless USE_PROC_FOR_LIBRARIES is defined. In some unlikely cases, this

lock is held. This appears to be difficult to fix, since the collector does

can result in unpleasant heap growth. But it seems better than the

look at data structures maintained by dlopen, and hence some locking is needed

race/deadlock issues we had before.

around the dlopen call. Defining USE_PROC_FOR_LIBRARIES will get address

space layout information from /proc avoiding the dlopen lock. But this has

other disadvanatages, e.g. mmapped files may be scanned.

If solaris_threads are used on an X86 processor with malloc redirected to

GC_malloc, it is necessary to call GC_thr_init explicitly before forking the