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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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Overview
Comment:The hash tables deallocate when empty in order to avoid nuisanse complaints from valgrind. Added tests to verify no hash table memory leaks in os_unix.c. (CVS 2738)
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SHA1: 080eadca582a49a069a76ed113ec15e9bce2955a
User & Date: drh 2005-10-03 15:11:09
Context
2005-10-04
18:38
Automatically check for the fdatasync() function and replace it with fsync() if not found. (CVS 2739) check-in: 385a08af user: drh tags: trunk
2005-10-03
15:11
The hash tables deallocate when empty in order to avoid nuisanse complaints from valgrind. Added tests to verify no hash table memory leaks in os_unix.c. (CVS 2738) check-in: 080eadca user: drh tags: trunk
2005-09-25
01:13
Make sure the default storage for virtual tables is the disk not memory while running conflict.test. Ticket #1453. (CVS 2737) check-in: 6d780ca6 user: drh tags: trunk
Changes
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Changes to src/hash.c.

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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This is the implementation of generic hash-tables
** used in SQLite.
**
** $Id: hash.c,v 1.16 2005/01/31 12:56:44 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <assert.h>

/* Turn bulk memory into a hash table object by initializing the
** fields of the Hash structure.
**
................................................................................
    pEntry->chain = 0;
  }
  if( pH->copyKey && elem->pKey ){
    sqliteFree(elem->pKey);
  }
  sqliteFree( elem );
  pH->count--;





}

/* Attempt to locate an element of the hash table pH with a key
** that matches pKey,nKey.  Return the data for this element if it is
** found, or NULL if there is no match.
*/
void *sqlite3HashFind(const Hash *pH, const void *pKey, int nKey){







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**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This is the implementation of generic hash-tables
** used in SQLite.
**
** $Id: hash.c,v 1.17 2005/10/03 15:11:09 drh Exp $
*/
#include "sqliteInt.h"
#include <assert.h>

/* Turn bulk memory into a hash table object by initializing the
** fields of the Hash structure.
**
................................................................................
    pEntry->chain = 0;
  }
  if( pH->copyKey && elem->pKey ){
    sqliteFree(elem->pKey);
  }
  sqliteFree( elem );
  pH->count--;
  if( pH->count<=0 ){
    assert( pH->first==0 );
    assert( pH->count==0 );
    sqlite3HashClear(pH);
  }
}

/* Attempt to locate an element of the hash table pH with a key
** that matches pKey,nKey.  Return the data for this element if it is
** found, or NULL if there is no match.
*/
void *sqlite3HashFind(const Hash *pH, const void *pKey, int nKey){

Added test/manydb.test.





















































































































































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# 2005 October 3
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests the ability of the library to open
# many different databases at the same time without leaking memory.
#
# $Id: manydb.test,v 1.1 2005/10/03 15:11:09 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

set N 300

# Create a bunch of random database names
#
unset -nocomplain dbname
unset -nocomplain used
for {set i 0} {$i<$N} {incr i} {
  while 1 {
    set name test-[format %08x [expr {int(rand()*0x7fffffff)}]].db
    if {[info exists used($name)]} continue
    set dbname($i) $name
    set used($name) $i
    break
  }
}

# Create a bunch of databases
#
for {set i 0} {$i<$N} {incr i} {
  do_test manydb-1.$i {
    sqlite3 db$i $dbname($i)
    execsql {
       CREATE TABLE t1(a,b);
       BEGIN;
       INSERT INTO t1 VALUES(1,2);
    } db$i
  } {}
}

# Finish the transactions
#
for {set i 0} {$i<$N} {incr i} {
  do_test manydb-2.$i {
    execsql {
       COMMIT;
       SELECT * FROM t1;
    } db$i
  } {1 2}
}


# Close the databases and erase the files.
#
for {set i 0} {$i<$N} {incr i} {
  do_test manydb-3.$i {
    db$i close
    file delete -force $dbname($i)
  } {}
}




finish_test