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mdbx: LCK-format version 3.

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The LCK file is re-created at every opportunity when the process that
opens the database is the only one that works with it. Thus the change
of the format of the file LCK creates only minimal compatibility
problems.

Applications using different versions of _libmdbx_ will be able to work
with one database alternately, but not at the same time. This appears to
be an acceptable inconvenience in exchange for new features.

Change-Id: I9414b3fffd53d5519c8172c57345b1eaf6e51c77
This commit is contained in:
Leonid Yuriev
2019-08-23 03:36:56 +03:00
parent de88707946
commit 6f8238e1e9
6 changed files with 172 additions and 152 deletions
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11
src/lck-windows.c
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@@ -1,4 +1,4 @@
/*
/*
* Copyright 2015-2019 Leonid Yuriev <leo@yuriev.ru>
* and other libmdbx authors: please see AUTHORS file.
* All rights reserved.
@@ -179,7 +179,7 @@ void mdbx_txn_unlock(MDBX_env *env) {
#define LCK_LO_OFFSET 0
#define LCK_LO_LEN offsetof(MDBX_lockinfo, mti_numreaders)
#define LCK_UP_OFFSET LCK_LO_LEN
#define LCK_UP_LEN (MDBX_LOCKINFO_WHOLE_SIZE - LCK_UP_OFFSET)
#define LCK_UP_LEN (sizeof(MDBX_lockinfo) - LCK_UP_OFFSET)
#define LCK_LOWER LCK_LO_OFFSET, LCK_LO_LEN
#define LCK_UPPER LCK_UP_OFFSET, LCK_UP_LEN
@@ -414,7 +414,9 @@ int mdbx_lck_seize(MDBX_env *env) {
assert(env->me_fd != INVALID_HANDLE_VALUE);
if (env->me_flags & MDBX_EXCLUSIVE)
return MDBX_RESULT_TRUE /* files were must be opened non-shareable */;
return MDBX_RESULT_TRUE /* nope since files were must be opened
non-shareable */
;
if (env->me_lfd == INVALID_HANDLE_VALUE) {
/* LY: without-lck mode (e.g. on read-only filesystem) */
@@ -459,7 +461,8 @@ int mdbx_lck_downgrade(MDBX_env *env, bool complete) {
assert(env->me_lfd != INVALID_HANDLE_VALUE);
if (env->me_flags & MDBX_EXCLUSIVE)
return MDBX_SUCCESS /* files were must be opened non-shareable */;
return MDBX_SUCCESS /* nope since files were must be opened non-shareable */
;
/* 1) must be at E-E (exclusive-write) */
if (!complete) {