README
Name
gc-trigger
Description
gc-trigger is a library for extension libraries that use many memories in external libraries. For example, an extension library that manipulates images is a target library.
Ruby's GC doesn't care about memory usage of external libraries. It means that Ruby's GC isn't run when extension library uses huge memories in external libraries. For example, Ruby's GC isn't run when you open many images by the extension library.
Install
% gem install gc-trigger
Usage
You can use C API and Ruby API. Normally, C API is suitable.
C API usage
Add the following code to your mkmf.rb
:
gc_trigger_spec = Gem::Specification.find_by_name("gc-trigger")
include_dir = File.join(gc_trigger_spec.gem_dir, "ext", "gc_trigger")
$CFLAGS << " -I#{include_dir}"
Include rb-gc-trigger.h
in your C code:
#include <rb-gc-trigger.h>
Call rb_gc_trigger_update_memory_usage()
with memory usage difference when memory usage is changed:
static VALUE
xxx_initialize(VALUE self)
{
/* Allocate memory for external library. */
DATA_PTR(self) = xxx_new();
/* Notify added memory usage in byte. */
rb_gc_trigger_update_memory_usage(1024);
return Qnil;
}
static void
free_func(void *xxx)
{
xxx_free(xxx);
/* Notify freed memosy usage in byte. */
rb_gc_trigger_update_memory_usage(-1024);
}
Ruby API usage
Require gc-trigger
:
require "gc-trigger"
Call GCTrigger.update_memory_usage
with memory usage difference when memory usage is changed:
def xxx_finalizer(size)
lambda do |id|
# Notify freed memory usage.
GCTrigger.update_memory_usage(-size)
end
end
def create_xxx
xxx = XXX.new
size = 1024
# Register finalizer that notify freed memory usage.
ObjectSpace.define_finalizer(xxx, xxx_finalizer(size))
# Notify added memory usage.
GCTrigger.update_memory_usage(size)
xxx
end
Author
Kouhei Sutou <[email protected]>
License
LGPLv3 or later. See doc/text/lgpl-3.0.txt for details.
(Kouhei Sutou has a right to change the license including contributed patches.)