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https://github.com/reactos/reactos.git
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133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
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* Copyright (c) 2002, TransGaming Technologies Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <precomp.h>
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typedef struct
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{
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BOOL bInit;
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CRITICAL_SECTION crit;
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} LOCKTABLEENTRY;
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static LOCKTABLEENTRY lock_table[ _TOTAL_LOCKS ];
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static __inline void msvcrt_mlock_set_entry_initialized( int locknum, BOOL initialized )
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{
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lock_table[ locknum ].bInit = initialized;
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}
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static __inline void msvcrt_initialize_mlock( int locknum )
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{
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InitializeCriticalSection( &(lock_table[ locknum ].crit) );
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msvcrt_mlock_set_entry_initialized( locknum, TRUE );
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}
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static __inline void msvcrt_uninitialize_mlock( int locknum )
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{
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DeleteCriticalSection( &(lock_table[ locknum ].crit) );
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msvcrt_mlock_set_entry_initialized( locknum, FALSE );
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}
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/**********************************************************************
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* msvcrt_init_mt_locks (internal)
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*
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* Initialize the table lock. All other locks will be initialized
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* upon first use.
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*
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*/
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void msvcrt_init_mt_locks(void)
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{
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int i;
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TRACE( "initializing mtlocks\n" );
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/* Initialize the table */
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for( i=0; i < _TOTAL_LOCKS; i++ )
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{
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msvcrt_mlock_set_entry_initialized( i, FALSE );
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}
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/* Initialize our lock table lock */
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msvcrt_initialize_mlock( _LOCKTAB_LOCK );
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}
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/**********************************************************************
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* msvcrt_free_mt_locks (internal)
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*
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* Uninitialize all mt locks. Assume that neither _lock or _unlock will
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* be called once we're calling this routine (ie _LOCKTAB_LOCK can be deleted)
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*
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*/
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void msvcrt_free_mt_locks(void)
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{
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int i;
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TRACE(": uninitializing all mtlocks\n" );
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/* Uninitialize the table */
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for( i=0; i < _TOTAL_LOCKS; i++ )
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{
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if( lock_table[ i ].bInit == TRUE )
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{
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msvcrt_uninitialize_mlock( i );
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}
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}
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}
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/**********************************************************************
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* _lock (MSVCRT.@)
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*/
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void _lock( int locknum )
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{
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TRACE( "(%d)\n", locknum );
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/* If the lock doesn't exist yet, create it */
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if( lock_table[ locknum ].bInit == FALSE )
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{
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/* Lock while we're changing the lock table */
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_lock( _LOCKTAB_LOCK );
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/* Check again if we've got a bit of a race on lock creation */
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if( lock_table[ locknum ].bInit == FALSE )
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{
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TRACE( ": creating lock #%d\n", locknum );
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msvcrt_initialize_mlock( locknum );
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}
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/* Unlock ourselves */
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_unlock( _LOCKTAB_LOCK );
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}
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EnterCriticalSection( &(lock_table[ locknum ].crit) );
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}
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/**********************************************************************
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* _unlock (MSVCRT.@)
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*
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* NOTE: There is no error detection to make sure the lock exists and is acquired.
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*/
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void _unlock( int locknum )
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{
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TRACE( "(%d)\n", locknum );
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LeaveCriticalSection( &(lock_table[ locknum ].crit) );
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}
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