242 lines
10 KiB
C
242 lines
10 KiB
C
/*
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******************************************************************************
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* *
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* Copyright (C) 2001-2004, International Business Machines *
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* Corporation and others. All Rights Reserved. *
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* *
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******************************************************************************
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* file name: uclean.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2001July05
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* created by: George Rhoten
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*/
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#ifndef __UCLEAN_H__
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#define __UCLEAN_H__
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#include "unicode/utypes.h"
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/**
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* Initialize ICU. This function loads and initializes data items
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* that are required internally by various ICU functions. Use of this explicit
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* initialization is required in multi-threaded applications; in
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* single threaded apps, use is optional, but incurs little additional
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* cost, and is thus recommended.
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* <p>
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* In multi-threaded applications, u_init() should be called in the
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* main thread before starting additional threads, or, alternatively
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* it can be called in each individual thread once, before other ICU
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* functions are called in that thread. In this second scenario, the
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* application must guarantee that the first call to u_init() happen
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* without contention, in a single thread only.
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* <p>
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* If <code>u_setMemoryFunctions()</code> or
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* <code>u_setMutexFunctions</code> are needed (uncommon), they must be
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* called _before_ <code>u_init()</code>.
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* <p>
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* Extra, repeated, or otherwise unneeded calls to u_init() do no harm,
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* other than taking a small amount of time.
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*
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* @param pErrorCode An ICU UErrorCode parameter. It must not be <code>NULL</code>.
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* An Error will be returned if some required part of ICU data can not
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* be loaded or initialized.
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* The function returns immediately if the input error code indicates a
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* failure, as usual.
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*
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* @draft ICU 2.6
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*/
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U_DRAFT void U_EXPORT2
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u_init(UErrorCode *status);
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/**
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* Clean up the system resources, such as allocated memory or open files,
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* used in all ICU libraries. This will free/delete all memory owned by the
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* ICU libraries, and return them to their original load state. All open ICU
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* items (collators, resource bundles, converters, etc.) must be closed before
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* calling this function, otherwise ICU may not free its allocated memory
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* (e.g. close your converters and resource bundles before calling this
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* function). Generally, this function should be called once just before
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* an application exits. For applications that dynamically load and unload
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* the ICU libraries (relatively uncommon), u_cleanup() should be called
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* just before the library unload.
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* <p>
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* u_cleanup() is not thread safe. All other threads should stop using ICU
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* before calling this function.
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* <p>
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* Any open ICU items will be left in an undefined state by u_cleanup(),
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* and any subsequent attempt to use such an item will give unpredictable
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* results.
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* <p>
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* After calling u_cleanup(), an application may continue to use ICU by
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* calling u_init(). An application must invoke u_init() first from one single
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* thread before allowing other threads call u_init(). All threads existing
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* at the time of the first thread's call to u_init() must also call
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* u_init() themselves before continuing with other ICU operations.
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* <p>
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* The use of u_cleanup() just before an application terminates is optional,
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* but it should be called only once for performance reasons. The primary
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* benefit is to eliminate reports of memory or resource leaks originating
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* in ICU code from the results generated by heap analysis tools.
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* <p>
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* <strong>Use this function with great care!</strong>
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* </p>
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*
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* @stable ICU 2.0
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* @system
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*/
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U_STABLE void U_EXPORT2
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u_cleanup(void);
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/**
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* An opaque pointer type that represents an ICU mutex.
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* For user-implemented mutexes, the value will typically point to a
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* struct or object that implements the mutex.
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* @draft ICU 2.8
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* @system
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*/
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typedef void *UMTX;
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/**
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* Function Pointer type for a user supplied mutex initialization function.
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* The user-supplied function will be called by ICU whenever ICU needs to create a
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* new mutex. The function implementation should create a mutex, and store a pointer
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* to something that uniquely identifies the mutex into the UMTX that is supplied
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* as a paramter.
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* @param context user supplied value, obtained from from u_setMutexFunctions().
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* @param mutex Receives a pointer that identifies the new mutex.
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* The mutex init function must set the UMTX to a non-null value.
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* Subsequent calls by ICU to lock, unlock, or destroy a mutex will
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* identify the mutex by the UMTX value.
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* @param status Error status. Report errors back to ICU by setting this variable
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* with an error code.
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* @draft ICU 2.8
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* @system
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*/
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typedef void U_CALLCONV UMtxInitFn (const void *context, UMTX *mutex, UErrorCode* status);
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/**
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* Function Pointer type for a user supplied mutex functions.
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* One of the user-supplied functions with this signature will be called by ICU
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* whenever ICU needs to lock, unlock, or destroy a mutex.
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* @param context user supplied value, obtained from from u_setMutexFunctions().
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* @param mutex specify the mutex on which to operate.
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* @draft ICU 2.8
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* @system
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*/
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typedef void U_CALLCONV UMtxFn (const void *context, UMTX *mutex);
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/**
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* Set the functions that ICU will use for mutex operations
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* Use of this function is optional; by default (without this function), ICU will
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* directly access system functions for mutex operations
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* This function can only be used when ICU is in an initial, unused state, before
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* u_init() has been called.
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* This function may be used even when ICU has been built without multi-threaded
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* support (see ICU_USE_THREADS pre-processor variable, umutex.h)
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* @param context This pointer value will be saved, and then (later) passed as
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* a parameter to the user-supplied mutex functions each time they
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* are called.
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* @param init Pointer to a mutex initialization function. Must be non-null.
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* @param destroy Pointer to the mutex destroy function. Must be non-null.
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* @param lock pointer to the mutex lock function. Must be non-null.
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* @param unlock Pointer to the mutex unlock function. Must be non-null.
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* @param status Receives error values.
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* @draft ICU 2.8
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* @system
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*/
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U_DRAFT void U_EXPORT2
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u_setMutexFunctions(const void *context, UMtxInitFn *init, UMtxFn *destroy, UMtxFn *lock, UMtxFn *unlock,
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UErrorCode *status);
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/**
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* Pointer type for a user supplied atomic increment or decrement function.
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* @param context user supplied value, obtained from from u_setAtomicIncDecFunctions().
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* @param p Pointer to a 32 bit int to be incremented or decremented
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* @return The value of the variable after the inc or dec operation.
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* @draft ICU 2.8
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* @system
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*/
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typedef int32_t U_CALLCONV UMtxAtomicFn(const void *context, int32_t *p);
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/**
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* Set the functions that ICU will use for atomic increment and decrement of int32_t values.
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* Use of this function is optional; by default (without this function), ICU will
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* use its own internal implementation of atomic increment/decrement.
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* This function can only be used when ICU is in an initial, unused state, before
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* u_init() has been called.
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* @param context This pointer value will be saved, and then (later) passed as
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* a parameter to the increment and decrement functions each time they
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* are called. This function can only be called
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* @param inc Pointer to a function to do an atomic increment operation. Must be non-null.
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* @param dec Pointer to a function to do an atomic decrement operation. Must be non-null.
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* @param status Receives error values.
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* @draft ICU 2.8
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* @system
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*/
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U_DRAFT void U_EXPORT2
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u_setAtomicIncDecFunctions(const void *context, UMtxAtomicFn *inc, UMtxAtomicFn *dec,
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UErrorCode *status);
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/**
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* Pointer type for a user supplied memory allocation function.
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* @param context user supplied value, obtained from from u_setMemoryFunctions().
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* @param size The number of bytes to be allocated
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* @return Pointer to the newly allocated memory, or NULL if the allocation failed.
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* @draft ICU 2.8
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* @system
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*/
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typedef void *U_CALLCONV UMemAllocFn(const void *context, size_t size);
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/**
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* Pointer type for a user supplied memory re-allocation function.
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* @param context user supplied value, obtained from from u_setMemoryFunctions().
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* @param size The number of bytes to be allocated
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* @return Pointer to the newly allocated memory, or NULL if the allocation failed.
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* @draft ICU 2.8
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* @system
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*/
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typedef void *U_CALLCONV UMemReallocFn(const void *context, void *mem, size_t size);
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/**
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* Pointer type for a user supplied memory free function. Behavior should be
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* similar the standard C library free().
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* @param context user supplied value, obtained from from u_setMemoryFunctions().
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* @param mem Pointer to the memory block to be resized
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* @param size The new size for the block
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* @return Pointer to the resized memory block, or NULL if the resizing failed.
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* @draft ICU 2.8
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* @system
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*/
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typedef void U_CALLCONV UMemFreeFn (const void *context, void *mem);
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/**
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* Set the functions that ICU will use for memory allocation.
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* Use of this function is optional; by default (without this function), ICU will
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* use the standard C library malloc() and free() functions.
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* This function can only be used when ICU is in an initial, unused state, before
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* u_init() has been called.
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* @param context This pointer value will be saved, and then (later) passed as
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* a parameter to the memory functions each time they
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* are called.
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* @param a Pointer to a user-supplied malloc function.
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* @param r Pointer to a user-supplied realloc function.
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* @param f Pointer to a user-supplied free function.
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* @param status Receives error values.
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* @draft ICU 2.8
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* @system
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*/
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U_DRAFT void U_EXPORT2
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u_setMemoryFunctions(const void *context, UMemAllocFn *a, UMemReallocFn *r, UMemFreeFn *f,
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UErrorCode *status);
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#endif
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