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mdbx: support for user-settable transaction context.

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Change-Id: Ib4a345628e2c1ca2f95ac7615ea53d94911e5198
This commit is contained in:
Leonid Yuriev
2020-09-29 14:41:44 +03:00
parent 10c50aaf2e
commit 6294e1710a
4 changed files with 112 additions and 2 deletions
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21
src/core.c
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@@ -6447,6 +6447,26 @@ int mdbx_txn_renew(MDBX_txn *txn) {
int mdbx_txn_begin(MDBX_env *env, MDBX_txn *parent, MDBX_txn_flags_t flags,
MDBX_txn **ret) {
return mdbx_txn_begin_ex(env, parent, flags, ret, nullptr);
}
int mdbx_txn_set_userctx(MDBX_txn *txn, void *ctx) {
int rc = check_txn(txn, MDBX_TXN_BLOCKED - MDBX_TXN_HAS_CHILD);
if (unlikely(rc != MDBX_SUCCESS))
return rc;
txn->mt_userctx = ctx;
return MDBX_SUCCESS;
}
void *mdbx_txn_get_userctx(const MDBX_txn *txn) {
return check_txn(txn, MDBX_TXN_BLOCKED - MDBX_TXN_HAS_CHILD)
? nullptr
: txn->mt_userctx;
}
int mdbx_txn_begin_ex(MDBX_env *env, MDBX_txn *parent, MDBX_txn_flags_t flags,
MDBX_txn **ret, void *context) {
MDBX_txn *txn;
unsigned size, tsize;
@@ -6582,6 +6602,7 @@ int mdbx_txn_begin(MDBX_env *env, MDBX_txn *parent, MDBX_txn_flags_t flags,
(txn->mt_flags & ~(MDBX_WRITEMAP | MDBX_SHRINK_ALLOWED |
MDBX_NOMETASYNC | MDBX_SAFE_NOSYNC)) == 0);
txn->mt_signature = MDBX_MT_SIGNATURE;
txn->mt_userctx = context;
*ret = txn;
mdbx_debug("begin txn %" PRIaTXN "%c %p on env %p, root page %" PRIaPGNO
"/%" PRIaPGNO,

1
src/internals.h
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@@ -798,6 +798,7 @@ struct MDBX_txn {
MDBX_dbi mt_numdbs;
size_t mt_owner; /* thread ID that owns this transaction */
MDBX_canary mt_canary;
void *mt_userctx; /* User-settable context */
union {
struct {