Changeset f57f8ea in mainline for uspace/srv/vfs/vfs_rdwr.c

Timestamp:

2008-01-02T20:25:24Z (17 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

9413c0d

Parents:

215e375

Message:

Rename unlink_futex to namespace_futex and introduce a new futex for serializing
concurrent access to a VFS node's contents by multiple clients.

File:

• uspace/srv/vfs/vfs_rdwr.c (modified) (3 diffs)

uspace/srv/vfs/vfs_rdwr.c

@@ -40 +40 @@
 #include <async.h>
 #include <errno.h>
+#include <futex.h>
 
 static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read)
@@ -81 +82 @@
         }
 
+        /*
+         * Lock the file's node so that no other client can read/write to it at
+         * the same time.
+         */
+        futex_down(&file->node->contents_futex);
+
         int fs_phone = vfs_grab_phone(file->node->fs_handle);   
         
@@ -109 +116 @@
 
         /*
+         * Unlock the VFS node.
+         */
+        futex_up(&file->node->contents_futex);
+
+        /*
          * Update the position pointer.
          */