1 /*
2 * Copyright (c) 2002, TransGaming Technologies Inc.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
17 */
18
19 #include <stdarg.h>
20
21 #include "wine/debug.h"
22 #include "windef.h"
23 #include "winbase.h"
24 #include "mtdll.h"
25
26 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
27
28 typedef struct
29 {
30 BOOL bInit;
31 CRITICAL_SECTION crit;
32 } LOCKTABLEENTRY;
33
34 static LOCKTABLEENTRY lock_table[ _TOTAL_LOCKS ];
35
36 static inline void msvcrt_mlock_set_entry_initialized( int locknum, BOOL initialized )
37 {
38 lock_table[ locknum ].bInit = initialized;
39 }
40
41 static inline void msvcrt_initialize_mlock( int locknum )
42 {
43 InitializeCriticalSection( &(lock_table[ locknum ].crit) );
44 lock_table[ locknum ].crit.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": LOCKTABLEENTRY.crit");
45 msvcrt_mlock_set_entry_initialized( locknum, TRUE );
46 }
47
48 static inline void msvcrt_uninitialize_mlock( int locknum )
49 {
50 lock_table[ locknum ].crit.DebugInfo->Spare[0] = 0;
51 DeleteCriticalSection( &(lock_table[ locknum ].crit) );
52 msvcrt_mlock_set_entry_initialized( locknum, FALSE );
53 }
54
55 /**********************************************************************
56 * msvcrt_init_mt_locks (internal)
57 *
58 * Initialize the table lock. All other locks will be initialized
59 * upon first use.
60 *
61 */
62 void msvcrt_init_mt_locks(void)
63 {
64 int i;
65
66 TRACE( "initializing mtlocks\n" );
67
68 /* Initialize the table */
69 for( i=0; i < _TOTAL_LOCKS; i++ )
70 {
71 msvcrt_mlock_set_entry_initialized( i, FALSE );
72 }
73
74 /* Initialize our lock table lock */
75 msvcrt_initialize_mlock( _LOCKTAB_LOCK );
76 }
77
78 /**********************************************************************
79 * msvcrt_free_mt_locks (internal)
80 *
81 * Uninitialize all mt locks. Assume that neither _lock or _unlock will
82 * be called once we're calling this routine (ie _LOCKTAB_LOCK can be deleted)
83 *
84 */
85 void msvcrt_free_mt_locks(void)
86 {
87 int i;
88
89 TRACE( ": uninitializing all mtlocks\n" );
90
91 /* Uninitialize the table */
92 for( i=0; i < _TOTAL_LOCKS; i++ )
93 {
94 if( lock_table[ i ].bInit )
95 {
96 msvcrt_uninitialize_mlock( i );
97 }
98 }
99 }
100
101
102 /**********************************************************************
103 * _lock (MSVCRT.@)
104 */
105 void CDECL _lock( int locknum )
106 {
107 TRACE( "(%d)\n", locknum );
108
109 /* If the lock doesn't exist yet, create it */
110 if( lock_table[ locknum ].bInit == FALSE )
111 {
112 /* Lock while we're changing the lock table */
113 _lock( _LOCKTAB_LOCK );
114
115 /* Check again if we've got a bit of a race on lock creation */
116 if( lock_table[ locknum ].bInit == FALSE )
117 {
118 TRACE( ": creating lock #%d\n", locknum );
119 msvcrt_initialize_mlock( locknum );
120 }
121
122 /* Unlock ourselves */
123 _unlock( _LOCKTAB_LOCK );
124 }
125
126 EnterCriticalSection( &(lock_table[ locknum ].crit) );
127 }
128
129 /**********************************************************************
130 * _unlock (MSVCRT.@)
131 *
132 * NOTE: There is no error detection to make sure the lock exists and is acquired.
133 */
134 void CDECL _unlock( int locknum )
135 {
136 TRACE( "(%d)\n", locknum );
137
138 LeaveCriticalSection( &(lock_table[ locknum ].crit) );
139 }
140
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