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#include <mysys/my_pthread.h>
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#include <mysys/my_list.h>
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#include <mysys/definitions.h>
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struct st_thr_lock;
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extern uint32_t locks_immediate,locks_waited ;
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extern pthread_mutex_t THR_LOCK_lock;
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enum thr_lock_type { TL_IGNORE=-1,
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TL_UNLOCK, /* UNLOCK ANY LOCK */
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TL_READ, /* Read lock */
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TL_READ_WITH_SHARED_LOCKS,
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/* High prior. than TL_WRITE. Allow concurrent insert */
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TL_READ_HIGH_PRIORITY,
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/* READ, Don't allow concurrent insert */
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Write lock, but allow other threads to read / write.
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Used by BDB tables in MySQL to mark that someone is
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reading/writing to the table.
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Write lock, but allow other threads to read.
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Used by ALTER TABLE in MySQL to allow readers
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to use the table until ALTER TABLE is finished.
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WRITE lock used by concurrent insert. Will allow
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READ, if one could use concurrent insert on table.
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TL_WRITE_CONCURRENT_INSERT,
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/* Write used by INSERT DELAYED. Allows READ locks */
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parser only! Late bound low_priority flag.
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At open_tables() becomes thd->update_lock_default.
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/* WRITE lock that has lower priority than TL_READ */
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TL_WRITE_LOW_PRIORITY,
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/* Normal WRITE lock */
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/* Abort new lock request with an error */
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enum enum_thr_lock_result { THR_LOCK_SUCCESS= 0, THR_LOCK_ABORTED= 1,
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THR_LOCK_WAIT_TIMEOUT= 2, THR_LOCK_DEADLOCK= 3 };
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extern ulong max_write_lock_count;
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extern ulong table_lock_wait_timeout;
added
removed
mysys/thr_lock.h
