utils: add file locking

Signed-off-by: Alessandro Comodi <acomodi@antmicro.com>

utils/dbfixup.py

diff --git a/utils/dbfixup.py b/utils/dbfixup.py
index a08bf5a..0e3310d 100755
--- a/utils/dbfixup.py
+++ b/utils/dbfixup.py
@@ -536,8 +536,10 @@
         changes += new_changes
 
         with open(fn_out, "w") as f:
+            util.lock_file(f, 10)
             for line in sorted(lines):
                 print(line, file=f)
+            util.unlock_file(f)
 
         if changes is not None:
             seg_files += 1

utils/sort_db.py

diff --git a/utils/sort_db.py b/utils/sort_db.py
index 7256b45..2d09a86 100755
--- a/utils/sort_db.py
+++ b/utils/sort_db.py
@@ -65,6 +65,7 @@
 import json
 import utils.xjson as xjson
 import utils.cmp as cmp
+from prjxray.util import lock_file, unlock_file
 
 
 def split_all(s, chars):
@@ -344,9 +345,11 @@
     #            copy[i], tosort[i])
 
     with open(pathname, 'w') as f:
+        lock_file(f, 10)
         for _, l in tosort:
             f.write(l)
             f.write('\n')
+        unlock_file(f)
 
     return True
 
@@ -405,8 +408,10 @@
     rows.sort(key=lambda i: i[0])
 
     with open(n, 'w') as f:
+        lock_file(f, 10)
         for l in rows:
             f.write(l[-1])
+        unlock_file(f)
 
     return True