/* ****************************************************************************** * * * Copyright (C) 2001-2005, International Business Machines * * Corporation and others. All Rights Reserved. * * * ****************************************************************************** * file name: uclean.h * encoding: US-ASCII * 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. The description further below applies to ICU 2.6 to ICU 3.4. * Starting with ICU 3.4, u_init() needs not be called any more for * ensuring thread safety, but it can give an indication for whether ICU * can load its data. In ICU 3.4, it will try to load the converter alias table * (cnvalias.icu) and give an error code if that fails. * This may change in the future. * <p> * For ensuring the availability of necessary data, an application should * open the service objects (converters, collators, etc.) that it will use * and check for error codes there. * <p> * Documentation for ICU 2.6 to ICU 3.4: * <p> * This function loads and initializes data items * that are required internally by various ICU functions. Use of this explicit * initialization is required in multi-threaded applications; in * single threaded apps, use is optional, but incurs little additional * cost, and is thus recommended. * <p> * In multi-threaded applications, u_init() should be called in the * main thread before starting additional threads, or, alternatively * it can be called in each individual thread once, before other ICU * functions are called in that thread. In this second scenario, the * application must guarantee that the first call to u_init() happen * without contention, in a single thread only. * <p> * If <code>u_setMemoryFunctions()</code> or * <code>u_setMutexFunctions</code> are needed (uncommon), they must be * called _before_ <code>u_init()</code>. * <p> * Extra, repeated, or otherwise unneeded calls to u_init() do no harm, * other than taking a small amount of time. * * @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); /** * 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. * <p> * 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 after * calling u_cleanup(), these runtime override functions will need to * be set up again if they are still required. * <p> * u_cleanup() is not thread safe. All other threads should stop using ICU * before calling this function. * <p> * 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. * <p> * 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. * <p> * 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. * <p> * <strong>Use this function with great care!</strong> * </p> * * @stable ICU 2.0 * @system */ U_STABLE void U_EXPORT2 u_cleanup(void); /** * 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. * @stable ICU 2.8 * @system */ typedef void *UMTX; /** * 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 paramter. * @param context user supplied value, obtained from 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. * @stable ICU 2.8 * @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 from u_setMutexFunctions(). * @param mutex specify the mutex on which to operate. * @stable ICU 2.8 * @system */ typedef void U_CALLCONV UMtxFn (const void *context, UMTX *mutex); /** * 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. * This function may be used even when ICU has been built without multi-threaded * support (see ICU_USE_THREADS pre-processor variable, umutex.h) * @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. * @stable ICU 2.8 * @system */ U_STABLE 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 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. * @stable ICU 2.8 * @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. * @stable ICU 2.8 * @system */ U_STABLE void U_EXPORT2 u_setAtomicIncDecFunctions(const void *context, UMtxAtomicFn *inc, UMtxAtomicFn *dec, UErrorCode *status); /** * Pointer type for a user supplied memory allocation function. * @param context user supplied value, obtained from 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 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 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 *a, UMemReallocFn *r, UMemFreeFn *f, UErrorCode *status); #endif