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mdbx-posix: refine mdbx_lck_init(), allow multi-opending with MDBX_LOCKING_SYSV.

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This commit is contained in:
Leonid Yuriev 2020-06-15 12:41:23 +03:00
parent 0bb950ad55
commit 35313d18bc
2 changed files with 13 additions and 7 deletions
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1
ChangeLog.md
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@ -1,6 +1,7 @@
v0.9.x (in the development):
- TODO: Native bindings for C++.
- TODO: Packages for AltLinux, Fedora/RHEL, Debian/Ubuntu.
- Support multi-opening the same DB in a process with SysV locking (BSD).
v0.8.1 2020-06-12:
- Minor change versioning. The last number in version now mean the number of commits since last release/tag.

19
src/lck-posix.c
View File

@ -538,13 +538,11 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_destroy(MDBX_env *env,
MDBX_INTERNAL_FUNC int __cold mdbx_lck_init(MDBX_env *env,
MDBX_env *inprocess_neighbor,
int global_uniqueness_flag) {
if (inprocess_neighbor)
return MDBX_SUCCESS /* currently don't need any initialization
if LCK already opened/used inside current process */
;
#if MDBX_LOCKING == MDBX_LOCKING_SYSV
int semid = -1;
if (global_uniqueness_flag) {
/* don't initialize semaphores twice */
(void)inprocess_neighbor;
if (global_uniqueness_flag == MDBX_RESULT_TRUE) {
struct stat st;
if (fstat(env->me_lazy_fd, &st))
return errno;
@ -588,14 +586,17 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_init(MDBX_env *env,
}
env->me_sysv_ipc.semid = semid;
return MDBX_SUCCESS;
#elif MDBX_LOCKING == MDBX_LOCKING_FUTEX
#warning "TODO"
(void)inprocess_neighbor;
if (global_uniqueness_flag != MDBX_RESULT_TRUE)
return MDBX_SUCCESS;
#error "FIXME: Not implemented"
#elif MDBX_LOCKING == MDBX_LOCKING_POSIX1988
/* don't initialize semaphores twice */
(void)inprocess_neighbor;
if (global_uniqueness_flag == MDBX_RESULT_TRUE) {
if (sem_init(&env->me_lck->mti_rlock, true, 1))
return errno;
@ -606,6 +607,10 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_init(MDBX_env *env,
#elif MDBX_LOCKING == MDBX_LOCKING_POSIX2001 || \
MDBX_LOCKING == MDBX_LOCKING_POSIX2008
if (inprocess_neighbor)
return MDBX_SUCCESS /* don't need any initialization for mutexes
if LCK already opened/used inside current process */
;
/* FIXME: Unfortunately, there is no other reliable way but to long testing
* on each platform. On the other hand, behavior like FreeBSD is incorrect