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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: uclean.h
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 #ifndef __UCLEAN_H__
18 #define __UCLEAN_H__
19
20 #include "unicode/utypes.h"
21 /**
22 * \file
23 * \brief C API: Initialize and clean up ICU
24 */
25
26 /**
27 * Initialize ICU.
28 *
29 * Use of this function is optional. It is OK to simply use ICU
30 * services and functions without first having initialized
31 * ICU by calling u_init().
32 *
33 * u_init() will attempt to load some part of ICU's data, and is
34 * useful as a test for configuration or installation problems that
35 * leave the ICU data inaccessible. A successful invocation of u_init()
36 * does not, however, guarantee that all ICU data is accessible.
37 *
38 * Multiple calls to u_init() cause no harm, aside from the small amount
39 * of time required.
40 *
41 * In old versions of ICU, u_init() was required in multi-threaded applications
42 * to ensure the thread safety of ICU. u_init() is no longer needed for this purpose.
43 *
44 * @param status An ICU UErrorCode parameter. It must not be <code>NULL</code>.
45 * An Error will be returned if some required part of ICU data can not
46 * be loaded or initialized.
47 * The function returns immediately if the input error code indicates a
48 * failure, as usual.
49 *
50 * @stable ICU 2.6
51 */
52 U_STABLE void U_EXPORT2
53 u_init(UErrorCode *status);
54
55 #ifndef U_HIDE_SYSTEM_API
56 /**
57 * Clean up the system resources, such as allocated memory or open files,
58 * used in all ICU libraries. This will free/delete all memory owned by the
59 * ICU libraries, and return them to their original load state. All open ICU
60 * items (collators, resource bundles, converters, etc.) must be closed before
61 * calling this function, otherwise ICU may not free its allocated memory
62 * (e.g. close your converters and resource bundles before calling this
63 * function). Generally, this function should be called once just before
64 * an application exits. For applications that dynamically load and unload
65 * the ICU libraries (relatively uncommon), u_cleanup() should be called
66 * just before the library unload.
67 * <p>
68 * u_cleanup() also clears any ICU heap functions, mutex functions or
69 * trace functions that may have been set for the process.
70 * This has the effect of restoring ICU to its initial condition, before
71 * any of these override functions were installed. Refer to
72 * u_setMemoryFunctions(), u_setMutexFunctions and
73 * utrace_setFunctions(). If ICU is to be reinitialized after
74 * calling u_cleanup(), these runtime override functions will need to
75 * be set up again if they are still required.
76 * <p>
77 * u_cleanup() is not thread safe. All other threads should stop using ICU
78 * before calling this function.
79 * <p>
80 * Any open ICU items will be left in an undefined state by u_cleanup(),
81 * and any subsequent attempt to use such an item will give unpredictable
82 * results.
83 * <p>
84 * After calling u_cleanup(), an application may continue to use ICU by
85 * calling u_init(). An application must invoke u_init() first from one single
86 * thread before allowing other threads call u_init(). All threads existing
87 * at the time of the first thread's call to u_init() must also call
88 * u_init() themselves before continuing with other ICU operations.
89 * <p>
90 * The use of u_cleanup() just before an application terminates is optional,
91 * but it should be called only once for performance reasons. The primary
92 * benefit is to eliminate reports of memory or resource leaks originating
93 * in ICU code from the results generated by heap analysis tools.
94 * <p>
95 * <strong>Use this function with great care!</strong>
96 * </p>
97 *
98 * @stable ICU 2.0
99 * @system
100 */
101 U_STABLE void U_EXPORT2
102 u_cleanup(void);
103
104 U_CDECL_BEGIN
105 /**
106 * Pointer type for a user supplied memory allocation function.
107 * @param context user supplied value, obtained from u_setMemoryFunctions().
108 * @param size The number of bytes to be allocated
109 * @return Pointer to the newly allocated memory, or NULL if the allocation failed.
110 * @stable ICU 2.8
111 * @system
112 */
113 typedef void *U_CALLCONV UMemAllocFn(const void *context, size_t size);
114 /**
115 * Pointer type for a user supplied memory re-allocation function.
116 * @param context user supplied value, obtained from u_setMemoryFunctions().
117 * @param size The number of bytes to be allocated
118 * @return Pointer to the newly allocated memory, or NULL if the allocation failed.
119 * @stable ICU 2.8
120 * @system
121 */
122 typedef void *U_CALLCONV UMemReallocFn(const void *context, void *mem, size_t size);
123 /**
124 * Pointer type for a user supplied memory free function. Behavior should be
125 * similar the standard C library free().
126 * @param context user supplied value, obtained from u_setMemoryFunctions().
127 * @param mem Pointer to the memory block to be resized
128 * @param size The new size for the block
129 * @return Pointer to the resized memory block, or NULL if the resizing failed.
130 * @stable ICU 2.8
131 * @system
132 */
133 typedef void U_CALLCONV UMemFreeFn (const void *context, void *mem);
134
135 /**
136 * Set the functions that ICU will use for memory allocation.
137 * Use of this function is optional; by default (without this function), ICU will
138 * use the standard C library malloc() and free() functions.
139 * This function can only be used when ICU is in an initial, unused state, before
140 * u_init() has been called.
141 * @param context This pointer value will be saved, and then (later) passed as
142 * a parameter to the memory functions each time they
143 * are called.
144 * @param a Pointer to a user-supplied malloc function.
145 * @param r Pointer to a user-supplied realloc function.
146 * @param f Pointer to a user-supplied free function.
147 * @param status Receives error values.
148 * @stable ICU 2.8
149 * @system
150 */
151 U_STABLE void U_EXPORT2
152 u_setMemoryFunctions(const void *context, UMemAllocFn * U_CALLCONV_FPTR a, UMemReallocFn * U_CALLCONV_FPTR r, UMemFreeFn * U_CALLCONV_FPTR f,
153 UErrorCode *status);
154
155 U_CDECL_END
156
157 #ifndef U_HIDE_DEPRECATED_API
158 /*********************************************************************************
159 *
160 * Deprecated Functions
161 *
162 * The following functions for user supplied mutexes are no longer supported.
163 * Any attempt to use them will return a U_UNSUPPORTED_ERROR.
164 *
165 **********************************************************************************/
166
167 /**
168 * An opaque pointer type that represents an ICU mutex.
169 * For user-implemented mutexes, the value will typically point to a
170 * struct or object that implements the mutex.
171 * @deprecated ICU 52. This type is no longer supported.
172 * @system
173 */
174 typedef void *UMTX;
175
176 U_CDECL_BEGIN
177 /**
178 * Function Pointer type for a user supplied mutex initialization function.
179 * The user-supplied function will be called by ICU whenever ICU needs to create a
180 * new mutex. The function implementation should create a mutex, and store a pointer
181 * to something that uniquely identifies the mutex into the UMTX that is supplied
182 * as a parameter.
183 * @param context user supplied value, obtained from u_setMutexFunctions().
184 * @param mutex Receives a pointer that identifies the new mutex.
185 * The mutex init function must set the UMTX to a non-null value.
186 * Subsequent calls by ICU to lock, unlock, or destroy a mutex will
187 * identify the mutex by the UMTX value.
188 * @param status Error status. Report errors back to ICU by setting this variable
189 * with an error code.
190 * @deprecated ICU 52. This function is no longer supported.
191 * @system
192 */
193 typedef void U_CALLCONV UMtxInitFn (const void *context, UMTX *mutex, UErrorCode* status);
194
195
196 /**
197 * Function Pointer type for a user supplied mutex functions.
198 * One of the user-supplied functions with this signature will be called by ICU
199 * whenever ICU needs to lock, unlock, or destroy a mutex.
200 * @param context user supplied value, obtained from u_setMutexFunctions().
201 * @param mutex specify the mutex on which to operate.
202 * @deprecated ICU 52. This function is no longer supported.
203 * @system
204 */
205 typedef void U_CALLCONV UMtxFn (const void *context, UMTX *mutex);
206 U_CDECL_END
207
208 /**
209 * Set the functions that ICU will use for mutex operations
210 * Use of this function is optional; by default (without this function), ICU will
211 * directly access system functions for mutex operations
212 * This function can only be used when ICU is in an initial, unused state, before
213 * u_init() has been called.
214 * @param context This pointer value will be saved, and then (later) passed as
215 * a parameter to the user-supplied mutex functions each time they
216 * are called.
217 * @param init Pointer to a mutex initialization function. Must be non-null.
218 * @param destroy Pointer to the mutex destroy function. Must be non-null.
219 * @param lock pointer to the mutex lock function. Must be non-null.
220 * @param unlock Pointer to the mutex unlock function. Must be non-null.
221 * @param status Receives error values.
222 * @deprecated ICU 52. This function is no longer supported.
223 * @system
224 */
225 U_DEPRECATED void U_EXPORT2
226 u_setMutexFunctions(const void *context, UMtxInitFn *init, UMtxFn *destroy, UMtxFn *lock, UMtxFn *unlock,
227 UErrorCode *status);
228
229
230 /**
231 * Pointer type for a user supplied atomic increment or decrement function.
232 * @param context user supplied value, obtained from u_setAtomicIncDecFunctions().
233 * @param p Pointer to a 32 bit int to be incremented or decremented
234 * @return The value of the variable after the inc or dec operation.
235 * @deprecated ICU 52. This function is no longer supported.
236 * @system
237 */
238 typedef int32_t U_CALLCONV UMtxAtomicFn(const void *context, int32_t *p);
239
240 /**
241 * Set the functions that ICU will use for atomic increment and decrement of int32_t values.
242 * Use of this function is optional; by default (without this function), ICU will
243 * use its own internal implementation of atomic increment/decrement.
244 * This function can only be used when ICU is in an initial, unused state, before
245 * u_init() has been called.
246 * @param context This pointer value will be saved, and then (later) passed as
247 * a parameter to the increment and decrement functions each time they
248 * are called. This function can only be called
249 * @param inc Pointer to a function to do an atomic increment operation. Must be non-null.
250 * @param dec Pointer to a function to do an atomic decrement operation. Must be non-null.
251 * @param status Receives error values.
252 * @deprecated ICU 52. This function is no longer supported.
253 * @system
254 */
255 U_DEPRECATED void U_EXPORT2
256 u_setAtomicIncDecFunctions(const void *context, UMtxAtomicFn *inc, UMtxAtomicFn *dec,
257 UErrorCode *status);
258
259 #endif /* U_HIDE_DEPRECATED_API */
260 #endif /* U_HIDE_SYSTEM_API */
261
262 #endif