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1//
2// locks.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// Critical sections used for synchronization in the CoreCRT.
7//
8#include <corecrt_internal.h>
9
10
11
12// This table holds the locks used by the CoreCRT. It is indexed using the
13// enumerators of the __acrt_lock_id enumeration.
14static CRITICAL_SECTION __acrt_lock_table[__acrt_lock_count];
15
16// This variable stores the number of locks that have been successfully
17// initialized. Locks are initialized in order and are destroyed in reverse
18// order. The startup and exit code must ensure that initialization and
19// destruction is synchronized: these functions should never be executed
20// concurrently.
21static unsigned __acrt_locks_initialized;
22
23
24
25extern "C" bool __cdecl __acrt_initialize_locks()
26{
27 for (unsigned i = 0; i < __acrt_lock_count; ++i)
28 {
29 if (!__acrt_InitializeCriticalSectionEx(&__acrt_lock_table[i], _CORECRT_SPINCOUNT, 0))
30 {
31 __acrt_uninitialize_locks(false);
32 return false;
33 }
34
35 ++__acrt_locks_initialized;
36 }
37
38 return true;
39}
40
41extern "C" bool __cdecl __acrt_uninitialize_locks(bool const /* terminating */)
42{
43 for (unsigned i = __acrt_locks_initialized; i > 0; --i)
44 {
45 DeleteCriticalSection(&__acrt_lock_table[i - 1]);
46 --__acrt_locks_initialized;
47 }
48
49 return true;
50}
51
52extern "C" void __cdecl __acrt_lock(_In_ __acrt_lock_id _Lock)
53{
54 EnterCriticalSection(&__acrt_lock_table[_Lock]);
55}
56
57extern "C" void __cdecl __acrt_unlock(_In_ __acrt_lock_id _Lock)
58{
59 LeaveCriticalSection(&__acrt_lock_table[_Lock]);
60}
61
62extern "C" void __cdecl _lock_locales()
63{
64 __acrt_eagerly_load_locale_apis();
65 __acrt_lock(__acrt_locale_lock);
66}
67
68extern "C" void __cdecl _unlock_locales()
69{
70 __acrt_unlock(__acrt_locale_lock);
71}