* Start of concurrent garbage collection. Processes write temporary

  roots to a per-process temporary file in /nix/var/nix/temproots
  while holding a write lock on that file.  The garbage collector
  acquires read locks on all those files, thus blocking further
  progress in other Nix processes, and reads the sets of temporary
  roots.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/libstore/gc.hh b/src/libstore/gc.hh
index 2ea851abc..838188ade 100644
--- a/src/libstore/gc.hh
+++ b/src/libstore/gc.hh
@@ -3,6 +3,7 @@
 
 #include "util.hh"
 
+
 /* Garbage collector operation. */
 typedef enum { gcReturnLive, gcReturnDead, gcDeleteDead } GCAction;
 
@@ -14,4 +15,9 @@ typedef enum { gcReturnLive, gcReturnDead, gcDeleteDead } GCAction;
 void collectGarbage(const PathSet & roots, GCAction action,
     PathSet & result);
 
+/* Register a temporary GC root.  This root will automatically
+   disappear when this process exits. */
+void addTempRoot(const Path & path);
+
+
 #endif /* !__GC_H */