Added locking support to Bu::File.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/stable/file.h b/src/stable/file.h
index e3497d3..6e05dc7 100644
--- a/src/stable/file.h
+++ b/src/stable/file.h
@@ -56,6 +56,25 @@ namespace Bu
         virtual bool isBlocking();
         virtual void setBlocking( bool bBlocking=true );
 
+        /**
+         * Tells you if advisory locks are supported.
+         */
+        bool canLock() const;
+
+        /**
+         * Acquires an advisory lock on the file.  On posix/linux this is done
+         * via flock.
+         *@param bExclusive Set to true to acquire an exclusive lock (i.e. a
+         * write lock).  If this is false then a shared lock (i.e. read lock) is
+         * acquired.  A file cannot have both an exclusive and shared lock.
+         */
+        void lock( bool bExclusive=true );
+
+        /**
+         * Release the held advisory lock.
+         */
+        void unlock();
+
         enum {
             // Flags
             Read        = 0x01, ///< Open file for reading