From: Nico Weber <nicolasweber@gmx.de>
Date: Fri, 7 Aug 2015 17:32:06 +0000 (+0000)
Subject: Add a comment.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2fe3acd745dc52776e47a82b11ab14b5892f51f5;p=oota-llvm.git

Add a comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244337 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Support/CrashRecoveryContext.cpp b/lib/Support/CrashRecoveryContext.cpp
index b9829e1192a..352b519f9b4 100644
--- a/lib/Support/CrashRecoveryContext.cpp
+++ b/lib/Support/CrashRecoveryContext.cpp
@@ -24,6 +24,10 @@ static ManagedStatic<
     sys::ThreadLocal<const CrashRecoveryContextImpl> > CurrentContext;
 
 struct CrashRecoveryContextImpl {
+  // When threads are disabled, this links up all active
+  // CrashRecoveryContextImpls.  When threads are enabled there's one thread
+  // per CrashRecoveryContext and CurrentContext is a thread-local, so only one
+  // CrashRecoveryContextImpl is active per thread and this is always null.
   const CrashRecoveryContextImpl *Next;
 
   CrashRecoveryContext *CRC;