Fix #12.
Readonly transaction can keep GVL in mdb_txn_begin.
Move TxnArgs to header file.
Handle interrupts accumulated during wait for mdb write mutex.
Fix #12.
Readonly transaction can keep GVL in mdb_txn_begin.
Move TxnArgs to header file.
Handle interrupts accumulated during wait for mdb write mutex.
Merge branch 'fix-issue-12' of github.com:vjoel/lmdb into fix-issue-12
Merge pull request #19 from vjoel/fix-issue-12

Fix #12.