Added @ThreadSafe.

src/main/java/net/rubygrapefruit/platform/PosixFile.java

@@ -5,12 +5,14 @@ import java.io.File;
 /**
  * Functions to query and modify a file's POSIX meta-data.
  */
+@ThreadSafe
 public interface PosixFile extends NativeIntegration {
     /**
      * Sets the mode for the given file.
      *
      * @throws NativeException On failure.
      */
+    @ThreadSafe
     void setMode(File path, int perms) throws NativeException;
 
     /**
@@ -18,6 +20,7 @@ public interface PosixFile extends NativeIntegration {
      *
      * @throws NativeException On failure.
      */
+    @ThreadSafe
     int getMode(File path) throws NativeException;
 
     /**
@@ -25,6 +28,7 @@ public interface PosixFile extends NativeIntegration {
      *
      * @throws NativeException On failure.
      */
+    @ThreadSafe
     void symlink(File link, String contents) throws NativeException;
 
     /**
@@ -32,5 +36,6 @@ public interface PosixFile extends NativeIntegration {
      *
      * @throws NativeException On failure.
      */
+    @ThreadSafe
     String readLink(File link) throws NativeException;
 }