From f6500f59756adc953501bb517f7ec616ab490f60 Mon Sep 17 00:00:00 2001
From: Samuel Just <sam.just@inktank.com>
Date: Thu, 28 Feb 2013 10:06:44 -0800
Subject: [PATCH] Context: allow C_Contexts to not have a cct, add
 list_to_context

This will simplify the SnapMapper implementation.

Signed-off-by: Samuel Just <sam.just@inktank.com>
---
 src/include/Context.h | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/src/include/Context.h b/src/include/Context.h
index a64bb2de5f669..f2416a075d6f3 100644
--- a/src/include/Context.h
+++ b/src/include/Context.h
@@ -67,12 +67,14 @@ inline void finish_contexts(CephContext *cct, std::list<Context*>& finished,
   list<Context*> ls;
   ls.swap(finished); // swap out of place to avoid weird loops
 
-  mydout(cct, 10) << ls.size() << " contexts to finish with " << result << dendl;
+  if (cct)
+    mydout(cct, 10) << ls.size() << " contexts to finish with " << result << dendl;
   for (std::list<Context*>::iterator it = ls.begin(); 
        it != ls.end(); 
        it++) {
     Context *c = *it;
-    mydout(cct,10) << "---- " << c << dendl;
+    if (cct)
+      mydout(cct,10) << "---- " << c << dendl;
     c->complete(result);
   }
 }
@@ -86,12 +88,14 @@ inline void finish_contexts(CephContext *cct, std::vector<Context*>& finished,
   vector<Context*> ls;
   ls.swap(finished); // swap out of place to avoid weird loops
 
-  mydout(cct,10) << ls.size() << " contexts to finish with " << result << dendl;
+  if (cct)
+    mydout(cct,10) << ls.size() << " contexts to finish with " << result << dendl;
   for (std::vector<Context*>::iterator it = ls.begin(); 
        it != ls.end(); 
        it++) {
     Context *c = *it;
-    mydout(cct,10) << "---- " << c << dendl;
+    if (cct)
+      mydout(cct,10) << "---- " << c << dendl;
     c->complete(result);
   }
 }
@@ -125,9 +129,21 @@ public:
     finish_contexts(cct, contexts, r);
   }
   bool empty() { return contexts.empty(); }
-};
-
 
+  static Context *list_to_context(list<Context *> &cs) {
+    if (cs.size() == 0) {
+      return 0;
+    } else if (cs.size() == 1) {
+      Context *c = cs.front();
+      cs.clear();
+      return c;
+    } else {
+      C_Contexts *c(new C_Contexts(0));
+      c->take(cs);
+      return c;
+    }
+  }
+};
 
 
 /*
-- 
2.39.5