New APR function apr_mmap_dup.

this is used in the MMAP bucket setaside function for a performance win.
Mod_file_cache will also use this
Submitted by:	Brian Pane <bpane@pacbell.net>


git-svn-id: http://svn.apache.org/repos/asf/apr/apr/trunk@62536 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 15 insertions, 0 deletions

diff --git a/include/apr_mmap.h b/include/apr_mmap.h
index 6edceaa0d..17cbab343 100644
--- a/include/apr_mmap.h
+++ b/include/apr_mmap.h
@@ -111,6 +111,8 @@ struct apr_mmap_t {
     void *mm;
     /** The amount of data in the mmap */
     apr_size_t size;
+    /** Whether this object is reponsible for doing the munmap */
+    int is_owner;
 };
 
 #if APR_HAS_MMAP || defined(DOXYGEN)
@@ -136,6 +138,19 @@ APR_DECLARE(apr_status_t) apr_mmap_create(apr_mmap_t **newmmap,
                                           apr_pool_t *cntxt);
 
 /**
+ * Duplicate the specified MMAP.
+ * @param new_mmap The structure to duplicate into. 
+ * @param old_mmap The file to duplicate.
+ * @param p The pool to use for the new file.
+ * @param transfer_ownership  Whether responsibility for destroying
+ *  the memory-mapped segment is transferred from old_mmap to new_mmap
+ */         
+APR_DECLARE(apr_status_t) apr_mmap_dup(apr_mmap_t **new_mmap,
+                                       apr_mmap_t *old_mmap,
+                                       apr_pool_t *p,
+                                       int transfer_ownership);
+
+/**
  * Remove a mmap'ed.
  * @param mmap The mmap'ed file.
  */