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Overview
Comment:Make the sqlite3_db_status() routine threadsafe.
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SHA1: 241f7bd190329fa02ca428651072a4a206132eab
User & Date: dan 2010-07-22 17:55:40.000
Context
2010-07-22
22:40
Add evidence marks to the where.c source file. Comment only - no code changes. (check-in: f3f9e8e5bb user: drh tags: trunk)
17:55
Make the sqlite3_db_status() routine threadsafe. (check-in: 241f7bd190 user: dan tags: trunk)
17:49
Enhance the LIKE/GLOB query optimization so that it works as long as there is an index with the appropriate collating sequence and even if the default collating sequence of the column is different. Ticket [4711020446da7d93d99]. (check-in: 9f932655f9 user: drh tags: trunk)
Changes
Side-by-Side Diff Ignore Whitespace Patch
Changes to src/status.c.
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int sqlite3_db_status(
  sqlite3 *db,          /* The database connection whose status is desired */
  int op,               /* Status verb */
  int *pCurrent,        /* Write current value here */
  int *pHighwater,      /* Write high-water mark here */
  int resetFlag         /* Reset high-water mark if true */
){
  int rc = SQLITE_OK;   /* Return code */
  sqlite3_mutex_enter(db->mutex);
  switch( op ){
    case SQLITE_DBSTATUS_LOOKASIDE_USED: {
      *pCurrent = db->lookaside.nOut;
      *pHighwater = db->lookaside.mxOut;
      if( resetFlag ){
        db->lookaside.mxOut = db->lookaside.nOut;
      }
      break;
    }

    /* 
    ** Return an approximation for the amount of memory currently used
    ** by all pagers associated with the given database connection.  The
    ** highwater mark is meaningless and is returned as zero.
    */
    case SQLITE_DBSTATUS_CACHE_USED: {
      int totalUsed = 0;
      int i;
      sqlite3BtreeEnterAll(db);
      for(i=0; i<db->nDb; i++){
        Btree *pBt = db->aDb[i].pBt;
        if( pBt ){
          Pager *pPager = sqlite3BtreePager(pBt);
          totalUsed += sqlite3PagerMemUsed(pPager);
        }
      }
      sqlite3BtreeLeaveAll(db);
      *pCurrent = totalUsed;
      *pHighwater = 0;
      break;
    }
    default: {
      return SQLITE_ERROR;
      rc = SQLITE_ERROR;
    }
  }
  sqlite3_mutex_leave(db->mutex);
  return SQLITE_OK;
  return rc;
}