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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 12:24:36 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 12:24:36 +0000 |
commit | 06eaf7232e9a920468c0f8d74dcf2fe8b555501c (patch) | |
tree | e2c7b5777f728320e5b5542b6213fd3591ba51e2 /storage/maria/lockman.h | |
parent | Initial commit. (diff) | |
download | mariadb-06eaf7232e9a920468c0f8d74dcf2fe8b555501c.tar.xz mariadb-06eaf7232e9a920468c0f8d74dcf2fe8b555501c.zip |
Adding upstream version 1:10.11.6.upstream/1%10.11.6
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'storage/maria/lockman.h')
-rw-r--r-- | storage/maria/lockman.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/storage/maria/lockman.h b/storage/maria/lockman.h new file mode 100644 index 00000000..35d0d8f5 --- /dev/null +++ b/storage/maria/lockman.h @@ -0,0 +1,76 @@ +/* Copyright (C) 2006 MySQL AB + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ + +#ifndef _lockman_h +#define _lockman_h + +/* + Lock levels: + ^^^^^^^^^^^ + + N - "no lock", not a lock, used sometimes internally to simplify the code + S - Shared + X - eXclusive + IS - Intention Shared + IX - Intention eXclusive + SIX - Shared + Intention eXclusive + LS - Loose Shared + LX - Loose eXclusive + SLX - Shared + Loose eXclusive + LSIX - Loose Shared + Intention eXclusive +*/ +enum lockman_lock_type { N, S, X, IS, IX, SIX, LS, LX, SLX, LSIX, LOCK_TYPE_LAST }; + +struct lockman_lock; + +typedef struct st_lock_owner LOCK_OWNER; +struct st_lock_owner { + LF_PINS *pins; /* must be allocated from lockman's pinbox */ + struct lockman_lock *all_locks; /* a LIFO */ + LOCK_OWNER *waiting_for; + pthread_cond_t *cond; /* transactions waiting for this, wait on 'cond' */ + pthread_mutex_t *mutex; /* mutex is required to use 'cond' */ + uint16 loid; +}; + +typedef LOCK_OWNER *loid_to_lo_func(uint16); +typedef struct { + LF_DYNARRAY array; /* hash itself */ + LF_ALLOCATOR alloc; /* allocator for elements */ + int32 volatile size; /* size of array */ + int32 volatile count; /* number of elements in the hash */ + uint lock_timeout; + loid_to_lo_func *loid_to_lo; +} LOCKMAN; +#define DIDNT_GET_THE_LOCK 0 +enum lockman_getlock_result { + NO_MEMORY_FOR_LOCK=1, DEADLOCK, LOCK_TIMEOUT, + GOT_THE_LOCK, + GOT_THE_LOCK_NEED_TO_LOCK_A_SUBRESOURCE, + GOT_THE_LOCK_NEED_TO_INSTANT_LOCK_A_SUBRESOURCE +}; + +void lockman_init(LOCKMAN *, loid_to_lo_func *, uint); +void lockman_destroy(LOCKMAN *); +enum lockman_getlock_result lockman_getlock(LOCKMAN *lm, LOCK_OWNER *lo, + uint64 resource, + enum lockman_lock_type lock); +int lockman_release_locks(LOCKMAN *, LOCK_OWNER *); + +#ifdef EXTRA_DEBUG +void print_lockhash(LOCKMAN *lm); +#endif + +#endif |