Rudimentary Linux and MacOSX support for org.simantics.nativemem

[simantics/platform.git] / bundles / org.simantics.nativemem / src / org / simantics / nativemem / internal / linux / Stat.java

diff --git a/bundles/org.simantics.nativemem/src/org/simantics/nativemem/internal/linux/Stat.java b/bundles/org.simantics.nativemem/src/org/simantics/nativemem/internal/linux/Stat.java
new file mode 100644 (file)
index 0000000..591fd1f
--- /dev/null
+++ b/bundles/org.simantics.nativemem/src/org/simantics/nativemem/internal/linux/Stat.java
@@ -0,0 +1,47 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.nativemem.internal.linux;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import org.simantics.nativemem.internal.Resource;
+
+/**
+ * @author Tuukka Lehtonen
+ * @since 1.29.0
+ */
+public class Stat {
+
+       private static final String SELF_STATM = "/proc/self/statm";
+       private static final Charset ASCII = Charset.forName("US-ASCII");
+
+       public static long getCurrentRSS(Resource r) {
+               try (BufferedReader rdr = Files.newBufferedReader(Paths.get(SELF_STATM), ASCII)) {
+                       String line = rdr.readLine();
+                       String[] nums = line.split(" ");
+                       if (nums.length == 0)
+                               return 0L;
+                       long rss = Long.parseLong(nums[0]);
+                       long pageSize = r.sysconf(Resource._SC_PAGESIZE);
+                       return rss * pageSize;
+               } catch (NumberFormatException e) {
+                       return 0L;
+               } catch (IOException e) {
+                       return 0L;
+               }
+       }
+
+}
\ No newline at end of file