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mdbx: add MDBX_TXN_RDONLY_PREPARE.

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Change-Id: I95647d1679b69d1e97514a45f20d7373174244d5
This commit is contained in:
Leonid Yuriev
2020-08-03 12:56:57 +03:00
parent 1e7a1da14e
commit 87de3fc25f
3 changed files with 47 additions and 30 deletions
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10
src/internals.h
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@@ -720,8 +720,9 @@ struct MDBX_txn {
/* Transaction Flags */
/* mdbx_txn_begin() flags */
#define MDBX_TXN_BEGIN_FLAGS \
(MDBX_TXN_NOMETASYNC | MDBX_TXN_NOSYNC | MDBX_TXN_RDONLY | MDBX_TXN_TRY)
#define MDBX_TXN_RO_BEGIN_FLAGS (MDBX_TXN_RDONLY | MDBX_TXN_RDONLY_PREPARE)
#define MDBX_TXN_RW_BEGIN_FLAGS \
(MDBX_TXN_NOMETASYNC | MDBX_TXN_NOSYNC | MDBX_TXN_TRY)
/* Additional flag for mdbx_sync_locked() */
#define MDBX_SHRINK_ALLOWED UINT32_C(0x40000000)
@@ -739,8 +740,9 @@ struct MDBX_txn {
(MDBX_TXN_FINISHED | MDBX_TXN_ERROR | MDBX_TXN_DIRTY | MDBX_TXN_SPILLS | \
MDBX_TXN_HAS_CHILD)
#if (TXN_FLAGS & MDBX_TXN_BEGIN_FLAGS) || \
((MDBX_TXN_BEGIN_FLAGS | TXN_FLAGS) & MDBX_SHRINK_ALLOWED)
#if (TXN_FLAGS & (MDBX_TXN_RW_BEGIN_FLAGS | MDBX_TXN_RO_BEGIN_FLAGS)) || \
((MDBX_TXN_RW_BEGIN_FLAGS | MDBX_TXN_RO_BEGIN_FLAGS | TXN_FLAGS) & \
MDBX_SHRINK_ALLOWED)
#error "Oops, some flags overlapped or wrong"
#endif