fix: bug for gc

Author: SpringMT

benchmarks/zstd_streaming_compress_memory.rb

@@ -15,8 +15,9 @@
 i = 0
 while true do
   stream = Zstd::StreamingCompress.new
-  stream << json_string
+  stream << json_string[0, 5]
   res = stream.flush
+  stream << json_string[5..-1]
   res << stream.finish
   if ((i % 1000) == 0 )
     GC.start

ext/zstdruby/streaming_compress.c

@@ -7,6 +7,15 @@ struct streaming_compress_t {
   size_t buf_size;
 };
 
+static void
+streaming_compress_mark(void *p)
+{
+  struct streaming_compress_t *sc = p;
+  // rb_gc_mark((VALUE)sc->ctx);
+  rb_gc_mark(sc->buf);
+  rb_gc_mark(sc->buf_size);
+}
+
 static void
 streaming_compress_free(void *p)
 {
@@ -26,7 +35,7 @@ streaming_compress_memsize(const void *p)
 
 static const rb_data_type_t streaming_compress_type = {
     "streaming_compress",
-    { 0, streaming_compress_free, streaming_compress_memsize, },
+    { streaming_compress_mark, streaming_compress_free, streaming_compress_memsize, },
      0, 0, RUBY_TYPED_FREE_IMMEDIATELY
 };