Patch: Add new _Jv_SetGCFreeSpaceDivisor method to libgcj.

[David Daney <ddaney@avtrex.com>]

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As I mentioned previously, GC_free_space_divisor is no longer exported 
from libgcj.so.

Access to this GC tuning parameter is needed on systems where the 
maximum heap size is set.  If GC_free_space_divisor is not set to a 
value larger than its default value of three, the heap can easily get 
fragmented in such a manner that OutOfMemoryErrors are thrown even 
though there is plenty of free memory.

Since the loss of the ability to adjust GC_free_space_divisor is a 
regression, this should be committed even though we are in stage three.

Tested on x86_64-pc-linux-gnu in libjava with no regressions.

OK to commit?

2007-10-20  David Daney  <ddaney@avtrex.com>

    * include/jvm.h (_Jv_SetGCFreeSpaceDivisor): Declare new function.
    * boehm.cc (_Jv_SetGCFreeSpaceDivisor): Define it.


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Index: include/jvm.h
===================================================================
--- include/jvm.h	(revision 129428)
+++ include/jvm.h	(working copy)
@@ -412,6 +412,10 @@ void _Jv_SetInitialHeapSize (const char 
    _Jv_GCSetMaximumHeapSize.  */
 void _Jv_SetMaximumHeapSize (const char *arg);
 
+/* External interface for setting the GC_free_space_divisor.  Calls
+   GC_set_free_space_divisor and returns the old value.  */
+int _Jv_SetGCFreeSpaceDivisor (int div);
+
 /* Free the method cache, if one was allocated.  This is only called
    during thread deregistration.  */
 void _Jv_FreeMethodCache ();
Index: boehm.cc
===================================================================
--- boehm.cc	(revision 129428)
+++ boehm.cc	(working copy)
@@ -465,6 +465,12 @@ _Jv_GCSetMaximumHeapSize (size_t size)
   GC_set_max_heap_size ((GC_word) size);
 }
 
+int
+_Jv_SetGCFreeSpaceDivisor (int div)
+{
+  return (int)GC_set_free_space_divisor ((GC_word)div);
+}
+
 void
 _Jv_DisableGC (void)
 {