1 files changed, 97 insertions, 0 deletions
diff --git a/erts/emulator/sys/common/erl_mseg.h b/erts/emulator/sys/common/erl_mseg.h
new file mode 100644
index 0000000000..1c5aa63e90
--- /dev/null
+++ b/erts/emulator/sys/common/erl_mseg.h
@@ -0,0 +1,97 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2002-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+
+#ifndef ERL_MSEG_H_
+#define ERL_MSEG_H_
+
+#include "sys.h"
+#include "erl_alloc_types.h"
+
+#ifndef HAVE_MMAP
+#  define HAVE_MMAP 0
+#endif
+#ifndef HAVE_MREMAP
+#  define HAVE_MREMAP 0
+#endif
+
+#if HAVE_MMAP
+#  define HAVE_ERTS_MSEG 1
+#else
+#  define HAVE_ERTS_MSEG 0
+#endif
+
+#if HAVE_ERTS_MSEG
+
+#define ERTS_MSEG_VSN_STR "0.9"
+
+typedef struct {
+    Uint amcbf;
+    Uint rmcbf;
+    Uint mcs;
+    Uint cci;
+} ErtsMsegInit_t;
+
+#define ERTS_MSEG_INIT_DEFAULT_INITIALIZER				\
+{									\
+    4*1024*1024,	/* amcbf: Absolute max cache bad fit	*/	\
+    20,			/* rmcbf: Relative max cache bad fit	*/	\
+    5,			/* mcs:   Max cache size		*/	\
+    1000		/* cci:   Cache check interval		*/	\
+}
+
+typedef struct {
+    int  cache;
+    int  preserv;
+    Uint abs_shrink_th;
+    Uint rel_shrink_th;
+} ErtsMsegOpt_t;
+
+#define ERTS_MSEG_DEFAULT_OPT_INITIALIZER				\
+{									\
+    1,			/* Use cache				*/	\
+    1,			/* Preserv data				*/	\
+    0,			/* Absolute shrink threshold		*/	\
+    0			/* Relative shrink threshold		*/	\
+}
+
+void *erts_mseg_alloc(ErtsAlcType_t, Uint *);
+void *erts_mseg_alloc_opt(ErtsAlcType_t, Uint *, const ErtsMsegOpt_t *);
+void  erts_mseg_dealloc(ErtsAlcType_t, void *, Uint);
+void  erts_mseg_dealloc_opt(ErtsAlcType_t, void *, Uint, const ErtsMsegOpt_t *);
+void *erts_mseg_realloc(ErtsAlcType_t, void *, Uint, Uint *);
+void *erts_mseg_realloc_opt(ErtsAlcType_t, void *, Uint, Uint *,
+			    const ErtsMsegOpt_t *);
+void  erts_mseg_clear_cache(void);
+Uint  erts_mseg_no(void);
+Uint  erts_mseg_unit_size(void);
+void  erts_mseg_init(ErtsMsegInit_t *init);
+void  erts_mseg_late_init(void); /* Have to be called after all allocators,
+				   threads and timers have been initialized. */
+void  erts_mseg_exit(void);
+Eterm erts_mseg_info_options(int *, void*, Uint **, Uint *);
+Eterm erts_mseg_info(int *, void*, int, Uint **, Uint *);
+
+#endif /* #if HAVE_ERTS_MSEG */
+
+unsigned long erts_mseg_test(unsigned long,
+			     unsigned long,
+			     unsigned long,
+			     unsigned long);
+
+#endif /* #ifndef ERL_MSEG_H_ */