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  1. 30 Jul, 2009 1 commit
  2. 27 May, 2009 1 commit
  3. 19 May, 2009 1 commit
    • Satya B's avatar
      Applying InnoDB snashot 5.1-ss5024,part 3. Fixes BUG#42101 · 3ea0fd9d
      Satya B authored
      BUG#42101 - Race condition in innodb_commit_concurrency
      
      Detailed revision comments:
      
      r4994 | marko | 2009-05-14 15:04:55 +0300 (Thu, 14 May 2009) | 18 lines
      branches/5.1: Prevent a race condition in innobase_commit() by ensuring
      that innodb_commit_concurrency>0 remains constant at run time. (Bug #42101)
      
      srv_commit_concurrency: Make this a static variable in ha_innodb.cc.
      
      innobase_commit_concurrency_validate(): Check that innodb_commit_concurrency
      is not changed from or to 0 at run time.  This is needed, because
      innobase_commit() assumes that innodb_commit_concurrency>0 remains constant.
      Without this limitation, the checks for innodb_commit_concurrency>0
      in innobase_commit() should be removed and that function would have to
      acquire and release commit_cond_m at least twice per invocation.
      Normally, innodb_commit_concurrency=0, and introducing the mutex operations
      would mean significant overhead.
      
      innodb_bug42101.test, innodb_bug42101-nonzero.test: Test cases.
      
      rb://123 approved by Heikki Tuuri
      3ea0fd9d