bk commit into 4.1 tree (tomas:1.2476) BUG#13987

[tomas]

Below is the list of changes that have just been committed into a local
4.1 repository of tomas. When tomas does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
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see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet
  1.2476 06/05/16 11:47:33 tomas@stripped +2 -0
  Bug #18591 Repeated "show" and "all status" calls to ndb_mgm causes mgmd to crash
  - not having lock can cause "block number list" to become corrupt => crash
  - also may result in 2 threads receiving same block no => possble cause of
  Bug #13987 Cluster: Loss of data nodes can cause high CPU usage from ndb_mgmd

  ndb/src/ndbapi/SignalSender.cpp
    1.5 06/05/16 11:47:26 tomas@stripped +2 -0
    Bug #18591 Repeated "show" and "all status" calls to ndb_mgm causes mgmd to crash
    - not having lock can cause "block number list" to become corrupt => crash
    - also may result in 2 threads receiving same block no => possble cause of
    Bug #13987 Cluster: Loss of data nodes can cause high CPU usage from ndb_mgmd

  ndb/src/mgmsrv/MgmtSrvr.cpp
    1.74 06/05/16 11:47:26 tomas@stripped +1 -0
    ndb: added missing lock of mutex

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	tomas
# Host:	poseidon.ndb.mysql.com
# Root:	/home/tomas/mysql-4.1

--- 1.73/ndb/src/mgmsrv/MgmtSrvr.cpp	2006-01-13 01:43:47 +01:00
+++ 1.74/ndb/src/mgmsrv/MgmtSrvr.cpp	2006-05-16 11:47:26 +02:00
@@ -2107,6 +2107,7 @@
 MgmtSrvr::abortBackup(Uint32 backupId)
 {
   SignalSender ss(theFacade);
+  ss.lock(); // lock will be released on exit
 
   bool next;
   NodeId nodeId = 0;

--- 1.4/ndb/src/ndbapi/SignalSender.cpp	2005-09-13 10:03:00 +02:00
+++ 1.5/ndb/src/ndbapi/SignalSender.cpp	2006-05-16 11:47:26 +02:00
@@ -75,7 +75,9 @@
 {
   m_cond = NdbCondition_Create();
   theFacade = facade;
+  lock();
   m_blockNo = theFacade->open(this, execSignal, execNodeStatus);
+  unlock();
   assert(m_blockNo > 0);
 }