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1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 ******************************************************************************
5 *
6 * Copyright (C) 2001-2013, International Business Machines
7 *                Corporation and others. All Rights Reserved.
8 *
9 ******************************************************************************
10 *   file name:  ucln.h
11 *   encoding:   US-ASCII
12 *   tab size:   8 (not used)
13 *   indentation:4
14 *
15 *   created on: 2001July05
16 *   created by: George Rhoten
17 */
18 
19 #ifndef __UCLN_H__
20 #define __UCLN_H__
21 
22 #include "unicode/utypes.h"
23 
24 /** These are the functions used to register a library's memory cleanup
25  * functions.  Each library should define a single library register function
26  * to call this API.  In the i18n library, it is ucln_i18n_registerCleanup().
27  *
28  * None of the cleanup functions should use a mutex to clean up an API's
29  * allocated memory because a cleanup function is not meant to be thread safe,
30  * and plenty of data cannot be reference counted in order to make sure that
31  * no one else needs the allocated data.
32  *
33  * In order to make a cleanup function get called when u_cleanup is called,
34  * You should add your function to the library specific cleanup function.
35  * If the cleanup function is not in the common library, the code that
36  * allocates the memory should call the library specific cleanup function.
37  * For instance, in the i18n library, any memory allocated statically must
38  * call ucln_i18n_registerCleanup() from the ucln_in.h header.  These library
39  * cleanup functions are needed in order to prevent a circular dependency
40  * between the common library and any other library.
41  *
42  * The order of the cleanup is very important.  In general, an API that
43  * depends on a second API should be cleaned up before the second API.
44  * For instance, the default converter in ustring depends upon the converter
45  * API.  So the default converter should be closed before the converter API
46  * has its cache flushed.  This will prevent any memory leaks due to
47  * reference counting.
48  *
49  * Please see common/ucln_cmn.{h,c} and i18n/ucln_in.{h,c} for examples.
50  */
51 
52 /**
53  * Data Type for cleanup function selector. These roughly correspond to libraries.
54  */
55 typedef enum ECleanupLibraryType {
56     UCLN_START = -1,
57     UCLN_UPLUG,     /* ICU plugins */
58     UCLN_CUSTOM,    /* Custom is for anyone else. */
59     UCLN_CTESTFW,
60     UCLN_TOOLUTIL,
61     UCLN_LAYOUTEX,
62     UCLN_LAYOUT,
63     UCLN_IO,
64     UCLN_I18N,
65     UCLN_COMMON /* This must be the last one to cleanup. */
66 } ECleanupLibraryType;
67 
68 /**
69  * Data type for cleanup function pointer
70  */
71 U_CDECL_BEGIN
72 typedef UBool U_CALLCONV cleanupFunc(void);
73 typedef void U_CALLCONV initFunc(UErrorCode *);
74 U_CDECL_END
75 
76 /**
77  * Register a cleanup function
78  * @param type which library to register for.
79  * @param func the function pointer
80  */
81 U_CAPI void U_EXPORT2 ucln_registerCleanup(ECleanupLibraryType type,
82                                            cleanupFunc *func);
83 
84 /**
85  * Request cleanup for one specific library.
86  * Not thread safe.
87  * @param type which library to cleanup
88  */
89 U_CAPI void U_EXPORT2 ucln_cleanupOne(ECleanupLibraryType type);
90 
91 #endif
92