uclean.h File Reference

C API: Initialize and clean up ICU. More...

#include "unicode/utypes.h"

Go to the source code of this file.

Typedefs

typedef void * UMTX
 An opaque pointer type that represents an ICU mutex.
typedef void UMtxInitFn (const void *context, UMTX *mutex, UErrorCode *status)
 Function Pointer type for a user supplied mutex initialization function.
typedef void UMtxFn (const void *context, UMTX *mutex)
 Function Pointer type for a user supplied mutex functions.
typedef int32_t UMtxAtomicFn (const void *context, int32_t *p)
 Pointer type for a user supplied atomic increment or decrement function.
typedef void * UMemAllocFn (const void *context, size_t size)
 Pointer type for a user supplied memory allocation function.
typedef void * UMemReallocFn (const void *context, void *mem, size_t size)
 Pointer type for a user supplied memory re-allocation function.
typedef void UMemFreeFn (const void *context, void *mem)
 Pointer type for a user supplied memory free function.

Functions

void u_init (UErrorCode *status)
 Initialize ICU.
void u_cleanup (void)
 Clean up the system resources, such as allocated memory or open files, used in all ICU libraries.
void u_setMutexFunctions (const void *context, UMtxInitFn *init, UMtxFn *destroy, UMtxFn *lock, UMtxFn *unlock, UErrorCode *status)
 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.
void u_setAtomicIncDecFunctions (const void *context, UMtxAtomicFn *inc, UMtxAtomicFn *dec, UErrorCode *status)
 Set the functions that ICU will use for atomic increment and decrement of int32_t values.
void u_setMemoryFunctions (const void *context, UMemAllocFn *a, UMemReallocFn *r, UMemFreeFn *f, UErrorCode *status)
 Set the functions that ICU will use for memory allocation.

Detailed Description

C API: Initialize and clean up ICU.

Definition in file uclean.h.


Typedef Documentation

typedef void* UMemAllocFn(const void *context, size_t size)

Pointer type for a user supplied memory allocation function.

Parameters:
context user supplied value, obtained from from u_setMemoryFunctions().
size The number of bytes to be allocated
Returns:
Pointer to the newly allocated memory, or NULL if the allocation failed.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.

Definition at line 209 of file uclean.h.

typedef void UMemFreeFn(const void *context, void *mem)

Pointer type for a user supplied memory free function.

Behavior should be similar the standard C library free().

Parameters:
context user supplied value, obtained from from u_setMemoryFunctions().
mem Pointer to the memory block to be resized
size The new size for the block
Returns:
Pointer to the resized memory block, or NULL if the resizing failed.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.

Definition at line 229 of file uclean.h.

typedef void* UMemReallocFn(const void *context, void *mem, size_t size)

Pointer type for a user supplied memory re-allocation function.

Parameters:
context user supplied value, obtained from from u_setMemoryFunctions().
size The number of bytes to be allocated
Returns:
Pointer to the newly allocated memory, or NULL if the allocation failed.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.

Definition at line 218 of file uclean.h.

typedef void* UMTX

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:
Do not use unless you know what you are doing.

Definition at line 113 of file uclean.h.

typedef int32_t UMtxAtomicFn(const void *context, int32_t *p)

Pointer type for a user supplied atomic increment or decrement function.

Parameters:
context user supplied value, obtained from from u_setAtomicIncDecFunctions().
p Pointer to a 32 bit int to be incremented or decremented
Returns:
The value of the variable after the inc or dec operation.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.

Definition at line 178 of file uclean.h.

typedef void UMtxFn(const void *context, UMTX *mutex)

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.

Parameters:
context user supplied value, obtained from from u_setMutexFunctions().
mutex specify the mutex on which to operate.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.

Definition at line 143 of file uclean.h.

typedef void UMtxInitFn(const void *context, UMTX *mutex, UErrorCode *status)

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.

Parameters:
context user supplied value, obtained from from u_setMutexFunctions().
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.
status Error status. Report errors back to ICU by setting this variable with an error code.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.

Definition at line 131 of file uclean.h.


Function Documentation

void u_cleanup ( void   ) 

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 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:
Do not use unless you know what you are doing.
void u_init ( UErrorCode status  ) 

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.

Parameters:
status An ICU UErrorCode parameter. It must not be NULL. 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
void u_setAtomicIncDecFunctions ( const void *  context,
UMtxAtomicFn inc,
UMtxAtomicFn dec,
UErrorCode status 
)

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.

Parameters:
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
inc Pointer to a function to do an atomic increment operation. Must be non-null.
dec Pointer to a function to do an atomic decrement operation. Must be non-null.
status Receives error values.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.
void u_setMemoryFunctions ( const void *  context,
UMemAllocFn a,
UMemReallocFn r,
UMemFreeFn f,
UErrorCode status 
)

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.

Parameters:
context This pointer value will be saved, and then (later) passed as a parameter to the memory functions each time they are called.
a Pointer to a user-supplied malloc function.
r Pointer to a user-supplied realloc function.
f Pointer to a user-supplied free function.
status Receives error values.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.
void u_setMutexFunctions ( const void *  context,
UMtxInitFn init,
UMtxFn destroy,
UMtxFn lock,
UMtxFn unlock,
UErrorCode status 
)

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)

Parameters:
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.
init Pointer to a mutex initialization function. Must be non-null.
destroy Pointer to the mutex destroy function. Must be non-null.
lock pointer to the mutex lock function. Must be non-null.
unlock Pointer to the mutex unlock function. Must be non-null.
status Receives error values.
Stable:
ICU 2.8
System:
Do not use unless you know what you are doing.
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