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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 ******************************************************************************
5 * Copyright (C) 2001-2014, International Business Machines
6 *                Corporation and others. All Rights Reserved.
7 ******************************************************************************
8 *   file name:  ucln_cmn.cpp
9 *   encoding:   UTF-8
10 *   tab size:   8 (not used)
11 *   indentation:4
12 *
13 *   created on: 2001July05
14 *   created by: George Rhoten
15 */
16 
17 #include "unicode/utypes.h"
18 #include "unicode/uclean.h"
19 #include "cmemory.h"
20 #include "mutex.h"
21 #include "uassert.h"
22 #include "ucln.h"
23 #include "ucln_cmn.h"
24 #include "utracimp.h"
25 #include "umutex.h"
26 
27 /**  Auto-client for UCLN_COMMON **/
28 #define UCLN_TYPE_IS_COMMON
29 #include "ucln_imp.h"
30 
31 static cleanupFunc *gCommonCleanupFunctions[UCLN_COMMON_COUNT];
32 static cleanupFunc *gLibCleanupFunctions[UCLN_COMMON];
33 
34 
35 /************************************************
36  The cleanup order is important in this function.
37  Please be sure that you have read ucln.h
38  ************************************************/
39 U_CAPI void U_EXPORT2
u_cleanup(void)40 u_cleanup(void)
41 {
42     UTRACE_ENTRY_OC(UTRACE_U_CLEANUP);
43     umtx_lock(NULL);     /* Force a memory barrier, so that we are sure to see   */
44     umtx_unlock(NULL);   /*   all state left around by any other threads.        */
45 
46     ucln_lib_cleanup();
47 
48     cmemory_cleanup();       /* undo any heap functions set by u_setMemoryFunctions(). */
49     UTRACE_EXIT();           /* Must be before utrace_cleanup(), which turns off tracing. */
50 /*#if U_ENABLE_TRACING*/
51     utrace_cleanup();
52 /*#endif*/
53 }
54 
ucln_cleanupOne(ECleanupLibraryType libType)55 U_CAPI void U_EXPORT2 ucln_cleanupOne(ECleanupLibraryType libType)
56 {
57     if (gLibCleanupFunctions[libType])
58     {
59         gLibCleanupFunctions[libType]();
60         gLibCleanupFunctions[libType] = NULL;
61     }
62 }
63 
64 U_CFUNC void
ucln_common_registerCleanup(ECleanupCommonType type,cleanupFunc * func)65 ucln_common_registerCleanup(ECleanupCommonType type,
66                             cleanupFunc *func)
67 {
68     U_ASSERT(UCLN_COMMON_START < type && type < UCLN_COMMON_COUNT);
69     if (UCLN_COMMON_START < type && type < UCLN_COMMON_COUNT)
70     {
71         icu::Mutex m;     // See ticket 10295 for discussion.
72         gCommonCleanupFunctions[type] = func;
73     }
74 #if !UCLN_NO_AUTO_CLEANUP && (defined(UCLN_AUTO_ATEXIT) || defined(UCLN_AUTO_LOCAL))
75     ucln_registerAutomaticCleanup();
76 #endif
77 }
78 
79 // Note: ucln_registerCleanup() is called with the ICU global mutex locked.
80 //       Be aware if adding anything to the function.
81 //       See ticket 10295 for discussion.
82 
83 U_CAPI void U_EXPORT2
ucln_registerCleanup(ECleanupLibraryType type,cleanupFunc * func)84 ucln_registerCleanup(ECleanupLibraryType type,
85                      cleanupFunc *func)
86 {
87     U_ASSERT(UCLN_START < type && type < UCLN_COMMON);
88     if (UCLN_START < type && type < UCLN_COMMON)
89     {
90         gLibCleanupFunctions[type] = func;
91     }
92 }
93 
ucln_lib_cleanup(void)94 U_CFUNC UBool ucln_lib_cleanup(void) {
95     int32_t libType = UCLN_START;
96     int32_t commonFunc = UCLN_COMMON_START;
97 
98     for (libType++; libType<UCLN_COMMON; libType++) {
99         ucln_cleanupOne(static_cast<ECleanupLibraryType>(libType));
100     }
101 
102     for (commonFunc++; commonFunc<UCLN_COMMON_COUNT; commonFunc++) {
103         if (gCommonCleanupFunctions[commonFunc])
104         {
105             gCommonCleanupFunctions[commonFunc]();
106             gCommonCleanupFunctions[commonFunc] = NULL;
107         }
108     }
109 #if !UCLN_NO_AUTO_CLEANUP && (defined(UCLN_AUTO_ATEXIT) || defined(UCLN_AUTO_LOCAL))
110     ucln_unRegisterAutomaticCleanup();
111 #endif
112     return TRUE;
113 }
114