diff options
Diffstat (limited to 'src/include/schema.h')
| -rw-r--r-- | src/include/schema.h | 162 |
1 files changed, 128 insertions, 34 deletions
diff --git a/src/include/schema.h b/src/include/schema.h index bb116e5cf2f..9a6e1e54e80 100644 --- a/src/include/schema.h +++ b/src/include/schema.h @@ -78,6 +78,14 @@ struct __wt_table { */ #define WT_COLGROUPS(t) WT_MAX((t)->ncolgroups, 1) +/* Helpers for the locked state of the handle list and table locks. */ +#define WT_SESSION_LOCKED_HANDLE_LIST \ + (WT_SESSION_LOCKED_HANDLE_LIST_READ | \ + WT_SESSION_LOCKED_HANDLE_LIST_WRITE) +#define WT_SESSION_LOCKED_TABLE \ + (WT_SESSION_LOCKED_TABLE_READ | \ + WT_SESSION_LOCKED_TABLE_WRITE) + /* * WT_WITH_LOCK_WAIT -- * Wait for a lock, perform an operation, drop the lock. @@ -85,7 +93,7 @@ struct __wt_table { #define WT_WITH_LOCK_WAIT(session, lock, flag, op) do { \ if (F_ISSET(session, (flag))) { \ op; \ - } else { \ + } else { \ __wt_spin_lock_track(session, lock); \ F_SET(session, (flag)); \ op; \ @@ -122,16 +130,46 @@ struct __wt_table { &S2C(session)->checkpoint_lock, WT_SESSION_LOCKED_CHECKPOINT, op) /* - * WT_WITH_HANDLE_LIST_LOCK -- - * Acquire the data handle list lock, perform an operation, drop the lock. + * WT_WITH_HANDLE_LIST_READ_LOCK -- + * Acquire the data handle list lock in shared mode, perform an operation, + * drop the lock. The handle list lock is a read-write lock so the + * implementation is different to the other lock macros. * * Note: always waits because some operations need the handle list lock to * discard handles, and we only expect it to be held across short * operations. */ -#define WT_WITH_HANDLE_LIST_LOCK(session, op) \ - WT_WITH_LOCK_WAIT(session, \ - &S2C(session)->dhandle_lock, WT_SESSION_LOCKED_HANDLE_LIST, op) +#define WT_WITH_HANDLE_LIST_READ_LOCK(session, op) do { \ + if (F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST)) { \ + op; \ + } else { \ + __wt_readlock(session, &S2C(session)->dhandle_lock); \ + F_SET(session, WT_SESSION_LOCKED_HANDLE_LIST_READ); \ + op; \ + F_CLR(session, WT_SESSION_LOCKED_HANDLE_LIST_READ); \ + __wt_readunlock(session, &S2C(session)->dhandle_lock); \ + } \ +} while (0) + +/* + * WT_WITH_HANDLE_LIST_WRITE_LOCK -- + * Acquire the data handle list lock in exclusive mode, perform an + * operation, drop the lock. The handle list lock is a read-write lock so + * the implementation is different to the other lock macros. + */ +#define WT_WITH_HANDLE_LIST_WRITE_LOCK(session, op) do { \ + if (F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST_WRITE)) { \ + op; \ + } else { \ + WT_ASSERT(session, \ + !F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST_READ));\ + __wt_writelock(session, &S2C(session)->dhandle_lock); \ + F_SET(session, WT_SESSION_LOCKED_HANDLE_LIST_WRITE); \ + op; \ + F_CLR(session, WT_SESSION_LOCKED_HANDLE_LIST_WRITE); \ + __wt_writeunlock(session, &S2C(session)->dhandle_lock); \ + } \ +} while (0) /* * WT_WITH_METADATA_LOCK -- @@ -165,22 +203,58 @@ struct __wt_table { } while (0) /* - * WT_WITH_TABLE_LOCK, WT_WITH_TABLE_LOCK_NOWAIT -- + * WT_WITH_TABLE_READ_LOCK, WT_WITH_TABLE_WRITE_LOCK, + * WT_WITH_TABLE_WRITE_LOCK_NOWAIT -- * Acquire the table lock, perform an operation, drop the lock. + * The table lock is a read-write lock so the implementation is different + * to most other lock macros. + * + * Note: readlock always waits because some operations need the table lock + * to discard handles, and we only expect it to be held across short + * operations. */ -#define WT_WITH_TABLE_LOCK(session, op) do { \ - WT_ASSERT(session, \ - F_ISSET(session, WT_SESSION_LOCKED_TABLE) || \ - !F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST)); \ - WT_WITH_LOCK_WAIT(session, \ - &S2C(session)->table_lock, WT_SESSION_LOCKED_TABLE, op); \ +#define WT_WITH_TABLE_READ_LOCK(session, op) do { \ + if (F_ISSET(session, WT_SESSION_LOCKED_TABLE)) { \ + op; \ + } else { \ + WT_ASSERT(session, \ + !F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST)); \ + __wt_readlock(session, &S2C(session)->table_lock); \ + F_SET(session, WT_SESSION_LOCKED_TABLE_READ); \ + op; \ + F_CLR(session, WT_SESSION_LOCKED_TABLE_READ); \ + __wt_readunlock(session, &S2C(session)->table_lock); \ + } \ +} while (0) + +#define WT_WITH_TABLE_WRITE_LOCK(session, op) do { \ + if (F_ISSET(session, WT_SESSION_LOCKED_TABLE_WRITE)) { \ + op; \ + } else { \ + WT_ASSERT(session, \ + !F_ISSET(session, WT_SESSION_LOCKED_TABLE_READ | \ + WT_SESSION_LOCKED_HANDLE_LIST)); \ + __wt_writelock(session, &S2C(session)->table_lock); \ + F_SET(session, WT_SESSION_LOCKED_TABLE_WRITE); \ + op; \ + F_CLR(session, WT_SESSION_LOCKED_TABLE_WRITE); \ + __wt_writeunlock(session, &S2C(session)->table_lock); \ + } \ } while (0) -#define WT_WITH_TABLE_LOCK_NOWAIT(session, ret, op) do { \ +#define WT_WITH_TABLE_WRITE_LOCK_NOWAIT(session, ret, op) do { \ WT_ASSERT(session, \ - F_ISSET(session, WT_SESSION_LOCKED_TABLE) || \ - !F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST)); \ - WT_WITH_LOCK_NOWAIT(session, ret, \ - &S2C(session)->table_lock, WT_SESSION_LOCKED_TABLE, op); \ + F_ISSET(session, WT_SESSION_LOCKED_TABLE_WRITE) || \ + !F_ISSET(session, WT_SESSION_LOCKED_TABLE_READ | \ + WT_SESSION_LOCKED_HANDLE_LIST)); \ + if (F_ISSET(session, WT_SESSION_LOCKED_TABLE_WRITE)) { \ + op; \ + } else if ((ret = __wt_try_writelock(session, \ + &S2C(session)->table_lock)) == 0) { \ + F_SET(session, WT_SESSION_LOCKED_TABLE_WRITE); \ + op; \ + F_CLR(session, WT_SESSION_LOCKED_TABLE_WRITE); \ + __wt_writeunlock(session, &S2C(session)->table_lock); \ + } \ } while (0) /* @@ -192,19 +266,31 @@ struct __wt_table { WT_CONNECTION_IMPL *__conn = S2C(session); \ bool __checkpoint_locked = \ F_ISSET(session, WT_SESSION_LOCKED_CHECKPOINT); \ - bool __handle_locked = \ - F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST); \ - bool __table_locked = \ - F_ISSET(session, WT_SESSION_LOCKED_TABLE); \ + bool __handle_read_locked = \ + F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST_READ); \ + bool __handle_write_locked = \ + F_ISSET(session, WT_SESSION_LOCKED_HANDLE_LIST_WRITE); \ + bool __table_read_locked = \ + F_ISSET(session, WT_SESSION_LOCKED_TABLE_READ); \ + bool __table_write_locked = \ + F_ISSET(session, WT_SESSION_LOCKED_TABLE_WRITE); \ bool __schema_locked = \ F_ISSET(session, WT_SESSION_LOCKED_SCHEMA); \ - if (__handle_locked) { \ - F_CLR(session, WT_SESSION_LOCKED_HANDLE_LIST); \ - __wt_spin_unlock(session, &__conn->dhandle_lock); \ + if (__handle_read_locked) { \ + F_CLR(session, WT_SESSION_LOCKED_HANDLE_LIST_READ); \ + __wt_readunlock(session, &__conn->dhandle_lock); \ } \ - if (__table_locked) { \ - F_CLR(session, WT_SESSION_LOCKED_TABLE); \ - __wt_spin_unlock(session, &__conn->table_lock); \ + if (__handle_write_locked) { \ + F_CLR(session, WT_SESSION_LOCKED_HANDLE_LIST_WRITE); \ + __wt_writeunlock(session, &__conn->dhandle_lock); \ + } \ + if (__table_read_locked) { \ + F_CLR(session, WT_SESSION_LOCKED_TABLE_READ); \ + __wt_readunlock(session, &__conn->table_lock); \ + } \ + if (__table_write_locked) { \ + F_CLR(session, WT_SESSION_LOCKED_TABLE_WRITE); \ + __wt_writeunlock(session, &__conn->table_lock); \ } \ if (__schema_locked) { \ F_CLR(session, WT_SESSION_LOCKED_SCHEMA); \ @@ -223,12 +309,20 @@ struct __wt_table { __wt_spin_lock(session, &__conn->schema_lock); \ F_SET(session, WT_SESSION_LOCKED_SCHEMA); \ } \ - if (__table_locked) { \ - __wt_spin_lock(session, &__conn->table_lock); \ - F_SET(session, WT_SESSION_LOCKED_TABLE); \ + if (__table_read_locked) { \ + __wt_readlock(session, &__conn->table_lock); \ + F_SET(session, WT_SESSION_LOCKED_TABLE_READ); \ + } \ + if (__table_write_locked) { \ + __wt_writelock(session, &__conn->table_lock); \ + F_SET(session, WT_SESSION_LOCKED_TABLE_WRITE); \ + } \ + if (__handle_read_locked) { \ + __wt_readlock(session, &__conn->dhandle_lock); \ + F_SET(session, WT_SESSION_LOCKED_HANDLE_LIST_READ); \ } \ - if (__handle_locked) { \ - __wt_spin_lock(session, &__conn->dhandle_lock); \ - F_SET(session, WT_SESSION_LOCKED_HANDLE_LIST); \ + if (__handle_write_locked) { \ + __wt_writelock(session, &__conn->dhandle_lock); \ + F_SET(session, WT_SESSION_LOCKED_HANDLE_LIST_WRITE); \ } \ } while (0) |