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[patch 003/129] Merge patch for revision 1788 from InnoDB SVN:
revno: 1788
revision-id: svn-v4:16c675df-0fcb-4bc9-8058-dcc011a37293:branches/zip:5670
parent: svn-v4:16c675df-0fcb-4bc9-8058-dcc011a37293:branches/zip:5663
committer: marko
timestamp: Wed 2009-08-12 12:16:37 +0000
message:
  branches/zip: trx_undo_rec_copy(): Add const qualifier to undo_rec.
  This is a non-functional change.
modified:
  include/trx0rec.h              2@16c675df-0fcb-4bc9-8058-dcc011a37293:trunk%2Finclude%2Ftrx0rec.h
  include/trx0rec.ic             2@16c675df-0fcb-4bc9-8058-dcc011a37293:trunk%2Finclude%2Ftrx0rec.ic
  trx/trx0rec.c                  2@16c675df-0fcb-4bc9-8058-dcc011a37293:trunk%2Ftrx%2Ftrx0rec.c
diff:
=== modified file 'include/trx0rec.h'

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docs/locks.rst
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User Defined Locks
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===================
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A user can create a "lock" which is scoped to their user space. Multiple
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session of the user can see the lock.
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SELECT GET_LOCK();
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SELECT GET_LOCKS();
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SELECT RELEASE_LOCK();
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SELECT RELEASE_LOCK();
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SELECT RELEASE_LOCKS();
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SELECT is_free_lock();
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SELECT is_used_lock();
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SELECT wait_for_lock();
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SELECT release_lock_and_wait();
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If a session should exit, whatever locks it was holding will be deleted.
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Please note, get_lock() was designed to be compatible with MySQL. If you
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hold any locks when calling get_lock() they will be released. For this
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reason you may want to consider calling get_locks() instead.
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release_lock_and_wait() released the named lock, and then waits for another
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session to try to obtain ownership. If it does not own the lock, it returns
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with a zero.
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Information on all barriers can be found in the DATA_DICTIONARY.USER_LOCKS
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table;