nobu	2016-09-20 16:52:25 +0900 (Tue, 20 Sep 2016)

  New Revision: 56189

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=56189

  Log:
    gc.c: rb_gc_adjust_memory_usage
    
    * gc.c (rb_gc_adjust_memory_usage): notify memory usage to the GC
      engine by extension libraries, to trigger GC.  [Feature #12690]

  Modified files:
    trunk/ChangeLog
    trunk/doc/extension.rdoc
    trunk/gc.c
    trunk/include/ruby/intern.h
Index: doc/extension.rdoc
===================================================================
--- doc/extension.rdoc	(revision 56188)
+++ doc/extension.rdoc	(revision 56189)
@@ -1652,6 +1652,18 @@ int rb_remove_event_hook(rb_event_hook_f https://github.com/ruby/ruby/blob/trunk/doc/extension.rdoc#L1652
 
   Removes the specified hook function.
 
+== Memory usage
+
+void rb_gc_adjust_memory_usage(ssize_t diff) ::
+
+  Adjusts the amount of registered external memory.  You can tell GC how
+  much memory is used by an external library by this function.  Calling
+  this function with positive diff means the memory usage is increased;
+  new memory block is allocated or a block is reallocated as larger
+  size.  Calling this function with negative diff means the memory usage
+  is decreased; a memory block is freed or a block is reallocated as
+  smaller size.  This function may trigger the GC.
+
 == Macros for Compatibility
 
 Some macros to check API compatibilities are available by default.
Index: include/ruby/intern.h
===================================================================
--- include/ruby/intern.h	(revision 56188)
+++ include/ruby/intern.h	(revision 56189)
@@ -502,6 +502,7 @@ VALUE rb_undefine_finalizer(VALUE); https://github.com/ruby/ruby/blob/trunk/include/ruby/intern.h#L502
 size_t rb_gc_count(void);
 size_t rb_gc_stat(VALUE);
 VALUE rb_gc_latest_gc_info(VALUE);
+void rb_gc_adjust_memory_usage(ssize_t);
 /* hash.c */
 void st_foreach_safe(struct st_table *, int (*)(ANYARGS), st_data_t);
 VALUE rb_check_hash_type(VALUE);
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 56188)
+++ ChangeLog	(revision 56189)
@@ -1,3 +1,8 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Tue Sep 20 16:52:23 2016  Nobuyoshi Nakada  <nobu@r...>
+
+	* gc.c (rb_gc_adjust_memory_usage): notify memory usage to the GC
+	  engine by extension libraries, to trigger GC.  [Feature #12690]
+
 Mon Sep 19 17:05:22 2016  Nobuyoshi Nakada  <nobu@r...>
 
 	* numeric.c (Init_Numeric), bignum.c (Init_Bignum): deprecate
Index: gc.c
===================================================================
--- gc.c	(revision 56188)
+++ gc.c	(revision 56189)
@@ -8096,6 +8096,18 @@ gc_malloc_allocations(VALUE self) https://github.com/ruby/ruby/blob/trunk/gc.c#L8096
 }
 #endif
 
+void
+rb_gc_adjust_memory_usage(ssize_t diff)
+{
+    rb_objspace_t *objspace = &rb_objspace;
+    if (diff > 0) {
+	objspace_malloc_increase(objspace, 0, diff, 0, MEMOP_TYPE_REALLOC);
+    }
+    else if (diff < 0) {
+	objspace_malloc_increase(objspace, 0, 0, -diff, MEMOP_TYPE_REALLOC);
+    }
+}
+
 /*
   ------------------------------ WeakMap ------------------------------
 */

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