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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
******************************************************************************
* Copyright (C) 2001-2014, International Business Machines
*                Corporation and others. All Rights Reserved.
******************************************************************************
*   file name:  uclean.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2001July05
*   created by: George Rhoten
*/

#ifndef __UCLEAN_H__
#define __UCLEAN_H__

#include "unicode/utypes.h"
/**
 * \file
 * \brief C API: Initialize and clean up ICU
 */
 
/**
 * Initialize ICU.
 *
 * Use of this function is optional. It is OK to simply use ICU
 * services and functions without first having initialized
 * ICU by calling u_init().
 *
 * u_init() will attempt to load some part of ICU's data, and is
 * useful as a test for configuration or installation problems that
 * leave the ICU data inaccessible. A successful invocation of u_init()
 * does not, however, guarantee that all ICU data is accessible.
 *
 * Multiple calls to u_init() cause no harm, aside from the small amount
 * of time required.
 *
 * In old versions of ICU, u_init() was required in multi-threaded applications
 * to ensure the thread safety of ICU. u_init() is no longer needed for this purpose.
 *
 * @param status An ICU UErrorCode parameter. It must not be <code>NULL</code>.
 * An Error will be returned if some required part of ICU data can not
 * be loaded or initialized.
 * The function returns immediately if the input error code indicates a
 * failure, as usual.
 *
 * @stable ICU 2.6
 */ 
U_STABLE void U_EXPORT2 
u_init(UErrorCode *status);

#ifndef U_HIDE_SYSTEM_API
/**
 * Clean up the system resources, such as allocated memory or open files,
 * used in all ICU libraries. This will free/delete all memory owned by the
 * ICU libraries, and return them to their original load state. All open ICU
 * items (collators, resource bundles, converters, etc.) must be closed before
 * calling this function, otherwise ICU may not free its allocated memory
 * (e.g. close your converters and resource bundles before calling this
 * function). Generally, this function should be called once just before
 * an application exits. For applications that dynamically load and unload
 * the ICU libraries (relatively uncommon), u_cleanup() should be called
 * just before the library unload.
 * 
 * u_cleanup() also clears any ICU heap functions, mutex functions or
 * trace functions that may have been set for the process. 
 * This has the effect of restoring ICU to its initial condition, before
 * any of these override functions were installed. Refer to
 * u_setMemoryFunctions(), u_setMutexFunctions and 
 * utrace_setFunctions(). If ICU is to be reinitialized after
 * calling u_cleanup(), these runtime override functions will need to
 * be set up again if they are still required.
 * 
 * u_cleanup() is not thread safe. All other threads should stop using ICU
 * before calling this function.
 * 
 * Any open ICU items will be left in an undefined state by u_cleanup(),
 * and any subsequent attempt to use such an item will give unpredictable
 * results.
 * 
 * After calling u_cleanup(), an application may continue to use ICU by
 * calling u_init(). An application must invoke u_init() first from one single
 * thread before allowing other threads call u_init(). All threads existing
 * at the time of the first thread's call to u_init() must also call
 * u_init() themselves before continuing with other ICU operations. 
 * 
 * The use of u_cleanup() just before an application terminates is optional,
 * but it should be called only once for performance reasons. The primary
 * benefit is to eliminate reports of memory or resource leaks originating
 * in ICU code from the results generated by heap analysis tools.
 * 
 * Use this function with great care!
 * 
 *
 * @stable ICU 2.0
 * @system
 */
U_STABLE void U_EXPORT2 
u_cleanup(void);

U_CDECL_BEGIN
/**
  *  Pointer type for a user supplied memory allocation function.
  *  @param context user supplied value, obtained from u_setMemoryFunctions().
  *  @param size    The number of bytes to be allocated
  *  @return        Pointer to the newly allocated memory, or NULL if the allocation failed.
  *  @stable ICU 2.8
  *  @system
  */
typedef void *U_CALLCONV UMemAllocFn(const void *context, size_t size);
/**
  *  Pointer type for a user supplied memory re-allocation function.
  *  @param context user supplied value, obtained from u_setMemoryFunctions().
  *  @param size    The number of bytes to be allocated
  *  @return        Pointer to the newly allocated memory, or NULL if the allocation failed.
  *  @stable ICU 2.8
  *  @system
  */
typedef void *U_CALLCONV UMemReallocFn(const void *context, void *mem, size_t size);
/**
  *  Pointer type for a user supplied memory free  function.  Behavior should be
  *  similar the standard C library free().
  *  @param context user supplied value, obtained from u_setMemoryFunctions().
  *  @param mem     Pointer to the memory block to be resized
  *  @param size    The new size for the block
  *  @return        Pointer to the resized memory block, or NULL if the resizing failed.
  *  @stable ICU 2.8
  *  @system
  */
typedef void  U_CALLCONV UMemFreeFn (const void *context, void *mem);

/**
 *  Set the functions that ICU will use for memory allocation.
 *  Use of this function is optional; by default (without this function), ICU will
 *  use the standard C library malloc() and free() functions.
 *  This function can only be used when ICU is in an initial, unused state, before
 *  u_init() has been called.
 *  @param context This pointer value will be saved, and then (later) passed as
 *                 a parameter to the memory functions each time they
 *                 are called.
 *  @param a       Pointer to a user-supplied malloc function.
 *  @param r       Pointer to a user-supplied realloc function.
 *  @param f       Pointer to a user-supplied free function.
 *  @param status  Receives error values.
 *  @stable ICU 2.8
 *  @system
 */  
U_STABLE void U_EXPORT2 
u_setMemoryFunctions(const void *context, UMemAllocFn * U_CALLCONV_FPTR a, UMemReallocFn * U_CALLCONV_FPTR r, UMemFreeFn * U_CALLCONV_FPTR f, 
                    UErrorCode *status);

U_CDECL_END

#ifndef U_HIDE_DEPRECATED_API
/*********************************************************************************
 *
 * Deprecated Functions
 *
 *    The following functions for user supplied mutexes are no longer supported.
 *    Any attempt to use them will return a U_UNSUPPORTED_ERROR.
 *
 **********************************************************************************/

/**
  * An opaque pointer type that represents an ICU mutex.
  * For user-implemented mutexes, the value will typically point to a
  *  struct or object that implements the mutex.
  * @deprecated ICU 52. This type is no longer supported.
  * @system
  */
typedef void *UMTX;

U_CDECL_BEGIN
/**
  *  Function Pointer type for a user supplied mutex initialization function.
  *  The user-supplied function will be called by ICU whenever ICU needs to create a
  *  new mutex.  The function implementation should create a mutex, and store a pointer
  *  to something that uniquely identifies the mutex into the UMTX that is supplied
  *  as a parameter.
  *  @param context user supplied value, obtained from u_setMutexFunctions().
  *  @param mutex   Receives a pointer that identifies the new mutex.
  *                 The mutex init function must set the UMTX to a non-null value.   
  *                 Subsequent calls by ICU to lock, unlock, or destroy a mutex will 
  *                 identify the mutex by the UMTX value.
  *  @param status  Error status.  Report errors back to ICU by setting this variable
  *                 with an error code.
  *  @deprecated ICU 52. This function is no longer supported.
  *  @system
  */
typedef void U_CALLCONV UMtxInitFn (const void *context, UMTX  *mutex, UErrorCode* status);

/**
  *  Function Pointer type for a user supplied mutex functions.
  *  One of the  user-supplied functions with this signature will be called by ICU
  *  whenever ICU needs to lock, unlock, or destroy a mutex.
  *  @param context user supplied value, obtained from u_setMutexFunctions().
  *  @param mutex   specify the mutex on which to operate.
  *  @deprecated ICU 52. This function is no longer supported.
  *  @system
  */
typedef void U_CALLCONV UMtxFn   (const void *context, UMTX  *mutex);
U_CDECL_END

/**
  *  Set the functions that ICU will use for mutex operations
  *  Use of this function is optional; by default (without this function), ICU will
  *  directly access system functions for mutex operations
  *  This function can only be used when ICU is in an initial, unused state, before
  *  u_init() has been called.
  *  @param context This pointer value will be saved, and then (later) passed as
  *                 a parameter to the user-supplied mutex functions each time they
  *                 are called. 
  *  @param init    Pointer to a mutex initialization function.  Must be non-null.
  *  @param destroy Pointer to the mutex destroy function.  Must be non-null.
  *  @param lock    pointer to the mutex lock function.  Must be non-null.
  *  @param unlock  Pointer to the mutex unlock function.  Must be non-null.
  *  @param status  Receives error values.
  *  @deprecated ICU 52. This function is no longer supported.
  *  @system
  */  
U_DEPRECATED void U_EXPORT2 
u_setMutexFunctions(const void *context, UMtxInitFn *init, UMtxFn *destroy, UMtxFn *lock, UMtxFn *unlock,
                    UErrorCode *status);

/**
  *  Pointer type for a user supplied atomic increment or decrement function.
  *  @param context user supplied value, obtained from u_setAtomicIncDecFunctions().
  *  @param p   Pointer to a 32 bit int to be incremented or decremented
  *  @return    The value of the variable after the inc or dec operation.
  *  @deprecated ICU 52. This function is no longer supported.
  *  @system
  */
typedef int32_t U_CALLCONV UMtxAtomicFn(const void *context, int32_t *p);

/**
 *  Set the functions that ICU will use for atomic increment and decrement of int32_t values.
 *  Use of this function is optional; by default (without this function), ICU will
 *  use its own internal implementation of atomic increment/decrement.
 *  This function can only be used when ICU is in an initial, unused state, before
 *  u_init() has been called.
 *  @param context This pointer value will be saved, and then (later) passed as
 *                 a parameter to the increment and decrement functions each time they
 *                 are called.  This function can only be called 
 *  @param inc     Pointer to a function to do an atomic increment operation.  Must be non-null.
 *  @param dec     Pointer to a function to do an atomic decrement operation.  Must be non-null.
 *  @param status  Receives error values.
 *  @deprecated ICU 52. This function is no longer supported.
 *  @system
 */  
U_DEPRECATED void U_EXPORT2 
u_setAtomicIncDecFunctions(const void *context, UMtxAtomicFn *inc, UMtxAtomicFn *dec,
                    UErrorCode *status);

#endif  /* U_HIDE_DEPRECATED_API */
#endif  /* U_HIDE_SYSTEM_API */

#endif

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