new file mode 100644
--- /dev/null
+++ b/src/core/ngx_slab.h
@@ -0,0 +1,37 @@
+#ifndef _NGX_SLAB_H_INCLUDED_
+#define _NGX_SLAB_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+typedef struct ngx_free_slab_s  ngx_free_slab_t;
+
+typedef struct ngx_free_slab_s {
+    ngx_free_slab_t  *next;
+}
+
+
+typedef struct ngx_slab_block_s  ngx_slab_block_t;
+
+typedef struct ngx_slab_block_s {
+    ngx_free_slab_t  *free;
+    ngx_slab_buf_t   *next;
+    size_t            color;
+};
+
+
+typedef struct {
+    ngx_slab_buf_t   *blocks;
+    size_t            size;
+
+    void             *start;
+    uint32_t          map;
+
+    ngx_log_t        *log;
+    ngx_free_pool_t   free;
+} ngx_slab_pool_t;
+
+
+#endif /* _NGX_SLAB_H_INCLUDED_ */