icuSources/common/unicode/uclean.h

   1 /*
   2 ******************************************************************************
   3 * Copyright (C) 2001-2013, International Business Machines
   4 *                Corporation and others. All Rights Reserved.
   5 ******************************************************************************
   6 *   file name:  uclean.h
   7 *   encoding:   US-ASCII
   8 *   tab size:   8 (not used)
   9 *   indentation:4
  10 *
  11 *   created on: 2001July05
  12 *   created by: George Rhoten
  13 */
  14
  15 #ifndef __UCLEAN_H__
  16 #define __UCLEAN_H__
  17
  18 #include "unicode/utypes.h"
  19 /**
  20  * \file
  21  * \brief C API: Initialize and clean up ICU
  22  */
  23
  24 /**
  25  *  Initialize ICU.
  26  *
  27  *  Use of this function is optional.  It is OK to simply use ICU
  28  *  services and functions without first having initialized
  29  *  ICU by calling u_init().
  30  *
  31  *  u_init() will attempt to load some part of ICU's data, and is
  32  *  useful as a test for configuration or installation problems that
  33  *  leave the ICU data inaccessible.  A successful invocation of u_init()
  34  *  does not, however, guarantee that all ICU data is accessible.
  35  *
  36  *  Multiple calls to u_init() cause no harm, aside from the small amount
  37  *  of time required.
  38  *
  39  *  In old versions of ICU, u_init() was required in multi-threaded applications
  40  *  to ensure the thread safety of ICU.  u_init() is no longer needed for this purpose.
  41  *
  42  * @param status An ICU UErrorCode parameter. It must not be <code>NULL</code>.
  43  *    An Error will be returned if some required part of ICU data can not
  44  *    be loaded or initialized.
  45  *    The function returns immediately if the input error code indicates a
  46  *    failure, as usual.
  47  *
  48  * @stable ICU 2.6
  49  */
  50 U_STABLE void U_EXPORT2
  51 u_init(UErrorCode *status);
  52
  53 #ifndef U_HIDE_SYSTEM_API
  54 /**
  55  * Clean up the system resources, such as allocated memory or open files,
  56  * used in all ICU libraries. This will free/delete all memory owned by the
  57  * ICU libraries, and return them to their original load state. All open ICU
  58  * items (collators, resource bundles, converters, etc.) must be closed before
  59  * calling this function, otherwise ICU may not free its allocated memory
  60  * (e.g. close your converters and resource bundles before calling this
  61  * function). Generally, this function should be called once just before
  62  * an application exits. For applications that dynamically load and unload
  63  * the ICU libraries (relatively uncommon), u_cleanup() should be called
  64  * just before the library unload.
  65  * <p>
  66  * u_cleanup() also clears any ICU heap functions, mutex functions or
  67  * trace functions that may have been set for the process.
  68  * This has the effect of restoring ICU to its initial condition, before
  69  * any of these override functions were installed.  Refer to
  70  * u_setMemoryFunctions(), u_setMutexFunctions and
  71  * utrace_setFunctions().  If ICU is to be reinitialized after after
  72  * calling u_cleanup(), these runtime override functions will need to
  73  * be set up again if they are still required.
  74  * <p>
  75  * u_cleanup() is not thread safe.  All other threads should stop using ICU
  76  * before calling this function.
  77  * <p>
  78  * Any open ICU items will be left in an undefined state by u_cleanup(),
  79  * and any subsequent attempt to use such an item will give unpredictable
  80  * results.
  81  * <p>
  82  * After calling u_cleanup(), an application may continue to use ICU by
  83  * calling u_init().  An application must invoke u_init() first from one single
  84  * thread before allowing other threads call u_init().  All threads existing
  85  * at the time of the first thread's call to u_init() must also call
  86  * u_init() themselves before continuing with other ICU operations.
  87  * <p>
  88  * The use of u_cleanup() just before an application terminates is optional,
  89  * but it should be called only once for performance reasons. The primary
  90  * benefit is to eliminate reports of memory or resource leaks originating
  91  * in ICU code from the results generated by heap analysis tools.
  92  * <p>
  93  * <strong>Use this function with great care!</strong>
  94  * </p>
  95  *
  96  * @stable ICU 2.0
  97  * @system
  98  */
  99 U_STABLE void U_EXPORT2
 100 u_cleanup(void);
 101
 102
 103 /**
 104   *  Pointer type for a user supplied memory allocation function.
 105   *  @param context user supplied value, obtained from from u_setMemoryFunctions().
 106   *  @param size    The number of bytes to be allocated
 107   *  @return        Pointer to the newly allocated memory, or NULL if the allocation failed.
 108   *  @stable ICU 2.8
 109   *  @system
 110   */
 111 typedef void *U_CALLCONV UMemAllocFn(const void *context, size_t size);
 112 /**
 113   *  Pointer type for a user supplied memory re-allocation function.
 114   *  @param context user supplied value, obtained from from u_setMemoryFunctions().
 115   *  @param size    The number of bytes to be allocated
 116   *  @return        Pointer to the newly allocated memory, or NULL if the allocation failed.
 117   *  @stable ICU 2.8
 118   *  @system
 119   */
 120 typedef void *U_CALLCONV UMemReallocFn(const void *context, void *mem, size_t size);
 121 /**
 122   *  Pointer type for a user supplied memory free  function.  Behavior should be
 123   *  similar the standard C library free().
 124   *  @param context user supplied value, obtained from from u_setMemoryFunctions().
 125   *  @param mem     Pointer to the memory block to be resized
 126   *  @param size    The new size for the block
 127   *  @return        Pointer to the resized memory block, or NULL if the resizing failed.
 128   *  @stable ICU 2.8
 129   *  @system
 130   */
 131 typedef void  U_CALLCONV UMemFreeFn (const void *context, void *mem);
 132
 133 /**
 134  *  Set the functions that ICU will use for memory allocation.
 135  *  Use of this function is optional; by default (without this function), ICU will
 136  *  use the standard C library malloc() and free() functions.
 137  *  This function can only be used when ICU is in an initial, unused state, before
 138  *  u_init() has been called.
 139  *  @param context This pointer value will be saved, and then (later) passed as
 140  *                 a parameter to the memory functions each time they
 141  *                 are called.
 142  *  @param a       Pointer to a user-supplied malloc function.
 143  *  @param r       Pointer to a user-supplied realloc function.
 144  *  @param f       Pointer to a user-supplied free function.
 145  *  @param status  Receives error values.
 146  *  @stable ICU 2.8
 147  *  @system
 148  */
 149 U_STABLE void U_EXPORT2
 150 u_setMemoryFunctions(const void *context, UMemAllocFn *a, UMemReallocFn *r, UMemFreeFn *f,
 151                     UErrorCode *status);
 152
 153
 154 /*********************************************************************************
 155  *
 156  * Deprecated Functions
 157  *
 158  *    The following functions for user supplied mutexes are no longer supported.
 159  *    Any attempt to use them will return a U_UNSUPPORTED_ERROR.
 160  *
 161  **********************************************************************************/
 162
 163 /**
 164   * An opaque pointer type that represents an ICU mutex.
 165   * For user-implemented mutexes, the value will typically point to a
 166   *  struct or object that implements the mutex.
 167   * @deprecated ICU 52. This type is no longer supported.
 168   * @system
 169   */
 170 typedef void *UMTX;
 171
 172 /**
 173   *  Function Pointer type for a user supplied mutex initialization function.
 174   *  The user-supplied function will be called by ICU whenever ICU needs to create a
 175   *  new mutex.  The function implementation should create a mutex, and store a pointer
 176   *  to something that uniquely identifies the mutex into the UMTX that is supplied
 177   *  as a paramter.
 178   *  @param context user supplied value, obtained from from u_setMutexFunctions().
 179   *  @param mutex   Receives a pointer that identifies the new mutex.
 180   *                 The mutex init function must set the UMTX to a non-null value.
 181   *                 Subsequent calls by ICU to lock, unlock, or destroy a mutex will
 182   *                 identify the mutex by the UMTX value.
 183   *  @param status  Error status.  Report errors back to ICU by setting this variable
 184   *                 with an error code.
 185   *  @deprecated ICU 52. This function is no longer supported.
 186   *  @system
 187   */
 188 typedef void U_CALLCONV UMtxInitFn (const void *context, UMTX  *mutex, UErrorCode* status);
 189
 190
 191 /**
 192   *  Function Pointer type for a user supplied mutex functions.
 193   *  One of the  user-supplied functions with this signature will be called by ICU
 194   *  whenever ICU needs to lock, unlock, or destroy a mutex.
 195   *  @param context user supplied value, obtained from from u_setMutexFunctions().
 196   *  @param mutex   specify the mutex on which to operate.
 197   *  @deprecated ICU 52. This function is no longer supported.
 198   *  @system
 199   */
 200 typedef void U_CALLCONV UMtxFn   (const void *context, UMTX  *mutex);
 201
 202
 203 /**
 204   *  Set the functions that ICU will use for mutex operations
 205   *  Use of this function is optional; by default (without this function), ICU will
 206   *  directly access system functions for mutex operations
 207   *  This function can only be used when ICU is in an initial, unused state, before
 208   *  u_init() has been called.
 209   *  @param context This pointer value will be saved, and then (later) passed as
 210   *                 a parameter to the user-supplied mutex functions each time they
 211   *                 are called.
 212   *  @param init    Pointer to a mutex initialization function.  Must be non-null.
 213   *  @param destroy Pointer to the mutex destroy function.  Must be non-null.
 214   *  @param lock    pointer to the mutex lock function.  Must be non-null.
 215   *  @param unlock  Pointer to the mutex unlock function.  Must be non-null.
 216   *  @param status  Receives error values.
 217   *  @deprecated ICU 52. This function is no longer supported.
 218   *  @system
 219   */
 220 U_DEPRECATED void U_EXPORT2
 221 u_setMutexFunctions(const void *context, UMtxInitFn *init, UMtxFn *destroy, UMtxFn *lock, UMtxFn *unlock,
 222                     UErrorCode *status);
 223
 224
 225 /**
 226   *  Pointer type for a user supplied atomic increment or decrement function.
 227   *  @param context user supplied value, obtained from from u_setAtomicIncDecFunctions().
 228   *  @param p   Pointer to a 32 bit int to be incremented or decremented
 229   *  @return    The value of the variable after the inc or dec operation.
 230   *  @deprecated ICU 52. This function is no longer supported.
 231   *  @system
 232   */
 233 typedef int32_t U_CALLCONV UMtxAtomicFn(const void *context, int32_t *p);
 234
 235 /**
 236  *  Set the functions that ICU will use for atomic increment and decrement of int32_t values.
 237  *  Use of this function is optional; by default (without this function), ICU will
 238  *  use its own internal implementation of atomic increment/decrement.
 239  *  This function can only be used when ICU is in an initial, unused state, before
 240  *  u_init() has been called.
 241  *  @param context This pointer value will be saved, and then (later) passed as
 242  *                 a parameter to the increment and decrement functions each time they
 243  *                 are called.  This function can only be called
 244  *  @param inc     Pointer to a function to do an atomic increment operation.  Must be non-null.
 245  *  @param dec     Pointer to a function to do an atomic decrement operation.  Must be non-null.
 246  *  @param status  Receives error values.
 247  *  @deprecated ICU 52. This function is no longer supported.
 248  *  @system
 249  */
 250 U_DEPRECATED void U_EXPORT2
 251 u_setAtomicIncDecFunctions(const void *context, UMtxAtomicFn *inc, UMtxAtomicFn *dec,
 252                     UErrorCode *status);
 253
 254 #endif  /* U_HIDE_SYSTEM_API */
 255
 256 #endif