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  1. MariaDB Server
  2. MDEV-24258

Merge dict_sys.mutex into dict_sys.latch

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      InnoDB data dictionary cache is protected by both dict_sys.latch (an RW-lock) and dict_sys.mutex. One reason for the redundant synchronization primitive would be eliminated by MDEV-24167: the rw-lock should not be slower than a mutex.

      Another reason for keeping a separate mutex is that sometimes, the mutex provides a mechanism to ‘upgrade’ the rw-lock. The most prominent case of that would be removed by MDEV-23484, if we could guarantee that transaction rollback is always protected by MDL. Currently, the rollback of recovered transactions is not being protected by MDL.

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              Assignee:
              marko Marko Mäkelä
              Reporter:
              marko Marko Mäkelä
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