Introduce new boolean parameter IO::truncate_files.

Currently Cactus always truncates existing output files unless the
simulation has been recovered from a checkpoint (in which case existing
output files will get appended unless the parameter
IO::truncate_files_after_recovering is set to true).

Christian Ott requested that it should also be possible to always append
new datasets to existing output files. The new boolean I/O parameter
IO::truncate_files implements that. Its default value is true,
preserving the existing Cactus behaviour.

This applies patch http://www.cactuscode.org/old/pipermail/patches/2006-May/000169.html.


git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/IOUtil/trunk@240 b32723a9-ab3a-4a60-88e2-2e5d99d7c17a

2 files changed, 7 insertions, 1 deletions

diff --git a/param.ccl b/param.ccl
index 1471218..11e8002 100644
--- a/param.ccl
+++ b/param.ccl
@@ -313,6 +313,10 @@ INT out_xyplane_zi "z-index (from 0) for 2D planes in xy, overrrides IO::out_xyp
 
 private:
 
+BOOLEAN truncate_files "Truncate existing output files from previous runs (except when recovering) ?" STEERABLE = ALWAYS
+{
+} "yes"
+
 BOOLEAN truncate_files_after_recovering "Truncate existing output files after recovering ?" STEERABLE = RECOVER
 {
 } "no"
diff --git a/src/Startup.c b/src/Startup.c
index 4f70c4c..75890fe 100644
--- a/src/Startup.c
+++ b/src/Startup.c
@@ -175,7 +175,9 @@ CCTK_INT IOUtil_TruncateOutputFiles (const CCTK_POINTER_TO_CONST GH)
     return (-1);
   }
 
-  return (! myGH->recovered || truncate_files_after_recovering);
+  return (truncate_files ||
+          truncate_files_after_recovering ||
+          ! myGH->recovered);
 }