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mdbx: prohibit recursive txn-begin by MDBX_BUSY.

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Change-Id: I46f5159cec72df9c8aece07fbfb462682499a272
This commit is contained in:
Leo Yuriev 2018-01-11 21:09:34 +03:00
parent 18432ebfab
commit 6b5533338f
1 changed files with 4 additions and 0 deletions
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4
src/mdbx.c
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@ -2775,12 +2775,16 @@ int mdbx_txn_begin(MDBX_env *env, MDBX_txn *parent, unsigned flags,
size = env->me_maxdbs * (sizeof(MDBX_db) + sizeof(MDBX_cursor *) + 1);
size += tsize = sizeof(MDBX_ntxn);
} else if (flags & MDBX_RDONLY) {
if (env->me_txn0 && unlikely(env->me_txn0->mt_owner == mdbx_thread_self()))
return MDBX_BUSY;
size = env->me_maxdbs * (sizeof(MDBX_db) + 1);
size += tsize = sizeof(MDBX_txn);
} else {
/* Reuse preallocated write txn. However, do not touch it until
* mdbx_txn_renew0() succeeds, since it currently may be active. */
txn = env->me_txn0;
if (unlikely(txn->mt_owner == mdbx_thread_self()))
return MDBX_BUSY;
goto renew;
}
if (unlikely((txn = calloc(1, size)) == NULL)) {