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make lock_tracker throw if the superblock is unlocked while other locks are still held.

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This commit is contained in:
Joe Thornber 2013-01-07 15:57:19 +00:00
parent 26b97908bd
commit b63a921d44
1 changed files with 9 additions and 4 deletions
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13
persistent-data/lock_tracker.cc
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@ -36,12 +36,12 @@ lock_tracker::read_lock(uint64_t key)
{
check_key(key);
LockMap::const_iterator it = locks_.find(key);
LockMap::iterator it = locks_.find(key);
if (found(it)) {
if (it->second < 0)
throw runtime_error("already write locked");
locks_.insert(make_pair(key, it->second + 1));
it->second++;
} else
locks_.insert(make_pair(key, 1));
@ -83,13 +83,18 @@ lock_tracker::unlock(uint64_t key)
if (!found(it))
throw runtime_error("not locked");
if (superblock_ && *superblock_ == key) {
if (locks_.size() > 1)
throw runtime_error("superblock unlocked while other locks still held");
superblock_ = boost::optional<uint64_t>();
}
if (it->second > 1)
locks_.insert(make_pair(key, it->second - 1));
else
locks_.erase(key);
if (superblock_ && *superblock_ == key)
superblock_ = boost::optional<uint64_t>();
}
bool