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ACE_Message_Block Class Reference

Stores messages for use throughout ACE (particularly <ACE_Message_Queue>). More...

#include <Message_Block.h>

Collaboration diagram for ACE_Message_Block:

[legend]List of all members.

Public Types
typedef int	ACE_Message_Type
typedef unsigned long	Message_Flags
enum	{   MB_DATA = 0x01, MB_PROTO = 0x02, MB_BREAK = 0x03, MB_PASSFP = 0x04,   MB_EVENT = 0x05, MB_SIG = 0x06, MB_IOCTL = 0x07, MB_SETOPTS = 0x08,   MB_IOCACK = 0x81, MB_IOCNAK = 0x82, MB_PCPROTO = 0x83, MB_PCSIG = 0x84,   MB_READ = 0x85, MB_FLUSH = 0x86, MB_STOP = 0x87, MB_START = 0x88,   MB_HANGUP = 0x89, MB_ERROR = 0x8a, MB_PCEVENT = 0x8b, MB_NORMAL = 0x00,   MB_PRIORITY = 0x80, MB_USER = 0x200 }
enum	{ DONT_DELETE = 01, USER_FLAGS = 0x1000 }
Public Methods
	ACE_Message_Block (ACE_Allocator *message_block_allocator=0)
	Create an empty message.
	ACE_Message_Block (ACE_Data_Block *, Message_Flags flags=0, ACE_Allocator *message_block_allocator=0)
	ACE_Message_Block (const char *data, size_t size=0, unsigned long priority=ACE_DEFAULT_MESSAGE_BLOCK_PRIORITY)
	ACE_Message_Block (size_t size, ACE_Message_Type type=MB_DATA, ACE_Message_Block *cont=0, const char *data=0, ACE_Allocator *allocator_strategy=0, ACE_Lock *locking_strategy=0, unsigned long priority=ACE_DEFAULT_MESSAGE_BLOCK_PRIORITY, const ACE_Time_Value &execution_time=ACE_Time_Value::zero, const ACE_Time_Value &deadline_time=ACE_Time_Value::max_time, ACE_Allocator *data_block_allocator=0, ACE_Allocator *message_block_allocator=0)
	ACE_Message_Block (const ACE_Message_Block &mb, size_t align)
int	init (const char *data, size_t size=0)
int	init (size_t size, ACE_Message_Type type=MB_DATA, ACE_Message_Block *cont=0, const char *data=0, ACE_Allocator *allocator_strategy=0, ACE_Lock *locking_strategy=0, unsigned long priority=ACE_DEFAULT_MESSAGE_BLOCK_PRIORITY, const ACE_Time_Value &execution_time=ACE_Time_Value::zero, const ACE_Time_Value &deadline_time=ACE_Time_Value::max_time, ACE_Allocator *data_block_allocator=0, ACE_Allocator *message_block_allocator=0)
virtual	~ACE_Message_Block (void)
ACE_Message_Type	msg_type (void) const
	Get type of the message.
void	msg_type (ACE_Message_Type type)
	Set type of the message.
int	is_data_msg (void) const
	Find out what type of message this is.
ACE_Message_Type	msg_class (void) const
Message_Flags	set_flags (Message_Flags more_flags)
Message_Flags	clr_flags (Message_Flags less_flags)
Message_Flags	flags (void) const
	Get the current message flags.
Message_Flags	set_self_flags (ACE_Message_Block::Message_Flags more_flags)
Message_Flags	clr_self_flags (ACE_Message_Block::Message_Flags less_flags)
Message_Flags	self_flags (void) const
	Get the current message flags.
unsigned long	msg_priority (void) const
	Get priority of the message.
void	msg_priority (unsigned long priority)
	Set priority of the message.
const ACE_Time_Value &	msg_execution_time (void) const
	Get execution time associated with the message.
void	msg_execution_time (const ACE_Time_Value &et)
	Set execution time associated with the message.
const ACE_Time_Value &	msg_deadline_time (void) const
	Get absolute time of deadline associated with the message.
void	msg_deadline_time (const ACE_Time_Value &dt)
	Set absolute time of deadline associated with the message.
virtual ACE_Message_Block *	clone (Message_Flags mask=0) const
virtual ACE_Message_Block *	duplicate (void) const
	Return a "shallow" copy that increments our reference count by 1.
virtual ACE_Message_Block *	release (void)
int	copy (const char *buf, size_t n)
int	copy (const char *buf)
void	crunch (void)
void	reset (void)
void	access_allocators (ACE_Allocator *&allocator_strategy, ACE_Allocator *&data_block_allocator, ACE_Allocator *&message_block_allocator)
void	reset_allocators (ACE_Allocator *allocator_strategy=0, ACE_Allocator *data_block_allocator=0, ACE_Allocator *message_block_allocator=0)
char *	base (void) const
	Get message data.
void	base (char *data, size_t size, Message_Flags=DONT_DELETE)
	Set message data (doesn't reallocate).
char *	end (void) const
	Return a pointer to 1 past the end of the allocated data in a message.
char *	mark (void) const
char *	rd_ptr (void) const
	Get the read pointer.
void	rd_ptr (char *ptr)
	Set the read pointer to <ptr>.
void	rd_ptr (size_t n)
	Set the read pointer ahead <n> bytes.
char *	wr_ptr (void) const
	Get the write pointer.
void	wr_ptr (char *ptr)
	Set the write pointer to <ptr>.
void	wr_ptr (size_t n)
ACE_Data_Block *	data_block (void) const
void	data_block (ACE_Data_Block *)
ACE_Data_Block *	replace_data_block (ACE_Data_Block *)
ACE_Message_Block *	cont (void) const
	Get the continuation field.
void	cont (ACE_Message_Block *)
	Set the continuation field.
ACE_Message_Block *	next (void) const
	Get link to next message.
void	next (ACE_Message_Block *)
	Set link to next message.
ACE_Message_Block *	prev (void) const
	Get link to prev message.
void	prev (ACE_Message_Block *)
	Set link to prev message.
ACE_Lock *	locking_strategy (void)
	Get the locking strategy.
ACE_Lock *	locking_strategy (ACE_Lock *)
	Set a new locking strategy and return the hold one.
int	reference_count (void) const
	Get the current reference count.
void	dump (void) const
	Dump the state of an object.
Message length and size operations
Message length is (wr_ptr - rd_ptr). Message size is capacity of the message, including data outside the [rd_ptr,wr_ptr] range.
size_t	length (void) const
	Get the length of the message.
void	length (size_t n)
	Set the length of the message.
size_t	total_length (void) const
size_t	total_size (void) const
void	total_size_and_length (size_t &mb_size, size_t &mb_length) const
size_t	size (void) const
int	size (size_t length)
size_t	total_capacity (void) const
size_t	capacity (void) const
	Get the number of allocated bytes in the top-level <Message_Block>.
size_t	space (void) const
Static Public Methods
ACE_Message_Block *	duplicate (const ACE_Message_Block *mb)
ACE_Message_Block *	release (ACE_Message_Block *mb)
Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks.
Protected Methods
	ACE_Message_Block (size_t size, ACE_Message_Type type, ACE_Message_Block *cont, const char *data, ACE_Allocator *allocator_strategy, ACE_Lock *locking_strategy, Message_Flags flags, unsigned long priority, const ACE_Time_Value &execution_time, const ACE_Time_Value &deadline_time, ACE_Data_Block *db, ACE_Allocator *data_block_allocator, ACE_Allocator *message_block_allocator)
	Perform the actual initialization.
int	release_i (ACE_Lock *lock)
int	init_i (size_t size, ACE_Message_Type type, ACE_Message_Block *cont, const char *data, ACE_Allocator *allocator_strategy, ACE_Lock *locking_strategy, Message_Flags flags, unsigned long priority, const ACE_Time_Value &execution_time, const ACE_Time_Value &deadline_time, ACE_Data_Block *db, ACE_Allocator *data_block_allocator, ACE_Allocator *message_block_allocator)
	Perform the actual initialization.
Protected Attributes
size_t	rd_ptr_
	Pointer to beginning of next read.
size_t	wr_ptr_
	Pointer to beginning of next write.
unsigned long	priority_
	Priority of message.
ACE_Message_Block *	cont_
	Pointer to next message block in the chain.
ACE_Message_Block *	next_
	Pointer to next message in the list.
ACE_Message_Block *	prev_
	Pointer to previous message in the list.
ACE_Message_Block::Message_Flags	flags_
	Misc flags (e.g., DONT_DELETE and USER_FLAGS).
ACE_Data_Block *	data_block_
ACE_Allocator *	message_block_allocator_
Private Methods
ACE_Message_Block &	operator= (const ACE_Message_Block &)
	ACE_Message_Block (const ACE_Message_Block &)
Friends
class	ACE_Data_Block

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Detailed Description

Stores messages for use throughout ACE (particularly <ACE_Message_Queue>).

An <ACE_Message_Block> is modeled after the message data structures used in System V STREAMS. Its purpose is to enable efficient manipulation of arbitrarily-large messages without incurring much memory copying overhead. Here are the main characteristics of an <ACE_Message_Block>: 1. Contains a pointer to a reference-counted <ACE_Data_Block>, which in turn points to the actual data buffer. This allows very flexible and efficient sharing of data by multiple <ACE_Message_Block>s. 2. One or more <ACE_Message_Blocks> can be linked to form a ``fragment chain.'' 3. <ACE_Message_Blocks> can be linked together by <prev_> and <next_> pointers to form a queue of messages (e.g., this is how <ACE_Message_Queue> works).

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Member Typedef Documentation

typedef int ACE_Message_Block::ACE_Message_Type

typedef unsigned long ACE_Message_Block::Message_Flags

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Member Enumeration Documentation

anonymous enum

Enumeration values: MB_DATA  Undifferentiated data message. MB_PROTO  Undifferentiated protocol control. MB_BREAK  Line break (regular and priority). MB_PASSFP  Pass file pointer. MB_EVENT  Post an event to an event queue. MB_SIG  Generate process signal. MB_IOCTL  ioctl; set/get params MB_SETOPTS  Set various stream head options. MB_IOCACK  Acknowledge ioctl (high priority; go to head of queue). MB_IOCNAK  Negative ioctl acknowledge. MB_PCPROTO  Priority proto message. MB_PCSIG  Generate process signal. MB_READ  Generate read notification. MB_FLUSH  Flush your queues. MB_STOP  Stop transmission immediately. MB_START  Restart transmission after stop. MB_HANGUP  Line disconnect. MB_ERROR  Fatal error used to set u.u_error. MB_PCEVENT  Post an event to an event queue. MB_NORMAL  Normal priority message mask. MB_PRIORITY  High priority control message mask. MB_USER  User-defined message mask.

anonymous enum

Enumeration values: DONT_DELETE  Don't delete the data on exit since we don't own it. USER_FLAGS  user defined flags start here

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Constructor & Destructor Documentation

ACE_Message_Block::ACE_Message_Block (  ACE_Allocator *    message_block_allocator = 0 )

Create an empty message.

ACE_Message_Block::ACE_Message_Block (  ACE_Data_Block *   , Message_Flags    flags = 0, ACE_Allocator *    message_block_allocator = 0 )

Create an <ACE_Message_Block> that owns the <ACE_Data_Block> without copying it. If the <flags> is set to DONT_DELETE we don't delete the ACE_Data_Block. It is left to the client's responsibility to take care of the memory allocated for the data_block

ACE_Message_Block::ACE_Message_Block (  const char *    data, size_t    size = 0, unsigned long    priority = ACE_DEFAULT_MESSAGE_BLOCK_PRIORITY )

Create a Message Block that assumes ownership of <data> without copying it (i.e., we don't delete it since we don't malloc it!). Note that the <size> of the <Message_Block> will be <size>, but the <length> will be 0 until <wr_ptr> is set.

ACE_Message_Block::ACE_Message_Block (  size_t    size, ACE_Message_Type    type = MB_DATA, ACE_Message_Block *    cont = 0, const char *    data = 0, ACE_Allocator *    allocator_strategy = 0, ACE_Lock *    locking_strategy = 0, unsigned long    priority = ACE_DEFAULT_MESSAGE_BLOCK_PRIORITY, const ACE_Time_Value &    execution_time = ACE_Time_Value::zero, const ACE_Time_Value &    deadline_time = ACE_Time_Value::max_time, ACE_Allocator *    data_block_allocator = 0, ACE_Allocator *    message_block_allocator = 0 )

Create an initialized message of type <type> containing <size> bytes. The <cont> argument initializes the continuation field in the <Message_Block>. If <data> == 0 then we create and own the <data>, using <allocator> to get the data if it's non-0. If <data> != 0 we assume that we have ownership of the <data> till this object ceases to exist (and don't delete it during destruction). If <locking_strategy> is non-0 then this is used to protect regions of code that access shared state (e.g., reference counting) from race conditions. Note that the <size> of the <Message_Block> will be <size>, but the <length> will be 0 until <wr_ptr> is set. The <data_block_allocator> is use to allocate the data blocks while the <allocator_strategy> is used to allocate the buffers contained by those. The <message_block_allocator> is used to allocate new <Message_Block> objects when a duplicate method is called. If a <message_block_allocator> is given, this <Message_Block> and future <Message_Block> objects created by duplicate will be free'ed into this allocator when they are released. Note: if you use this allocator, the <Message_Block> you created should have been created using this allocator because it will be released to the same allocator.

ACE_Message_Block::ACE_Message_Block (  const ACE_Message_Block &    mb, size_t    align )

A copy constructor. This constructor is a bit different. If the incoming Message Block has a data block from the stack this constructor does a deep copy ie. allocates a new data block on the heap and does a copy of the data from the incoming message block. As a final note, the alignment information is used to align the data block if it is created afresh. If the incoming <mb> has a data block has a data block allocated from the heap, then this constructor just duplicates (ie. a shallow copy) the data block of the incoming <mb>.

ACE_Message_Block::~ACE_Message_Block (  void    )  [virtual]

Delete all the resources held in the message. Note that <release()> is designed to release the continuation chain; the destructor is not. See <release()> for details.

ACE_Message_Block::ACE_Message_Block (  size_t    size, ACE_Message_Type    type, ACE_Message_Block *    cont, const char *    data, ACE_Allocator *    allocator_strategy, ACE_Lock *    locking_strategy, Message_Flags    flags, unsigned long    priority, const ACE_Time_Value &    execution_time, const ACE_Time_Value &    deadline_time, ACE_Data_Block *    db, ACE_Allocator *    data_block_allocator, ACE_Allocator *    message_block_allocator )  [protected]

Perform the actual initialization.

ACE_Message_Block::ACE_Message_Block (  const ACE_Message_Block &    )  [private]

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Member Function Documentation

ACE_INLINE void ACE_Message_Block::access_allocators (  ACE_Allocator *&    allocator_strategy, ACE_Allocator *&    data_block_allocator, ACE_Allocator *&    message_block_allocator )

This method returns the allocators only from the first message block in the chain. Parameters: allocator_strategy  Strategy used to allocate the underlying buffer data_block_allocator  Strategy used to allocate the underlying data block message_block_allocator  Strategy used to allocate the message block

ACE_INLINE void ACE_Message_Block::base (  char *    data, size_t    size, Message_Flags    = DONT_DELETE )

Set message data (doesn't reallocate).

ACE_INLINE char * ACE_Message_Block::base (  void    )  const

Get message data.

ACE_INLINE size_t ACE_Message_Block::capacity (  void    )  const

Get the number of allocated bytes in the top-level <Message_Block>.

ACE_Message_Block * ACE_Message_Block::clone (  Message_Flags    mask = 0 )  const [virtual]

Return an exact "deep copy" of the message, i.e., create fresh new copies of all the Data_Blocks and continuations.

ACE_INLINE ACE_Message_Block::Message_Flags ACE_Message_Block::clr_flags (  Message_Flags    less_flags )

Clear the message flag bits specified in <less_flags> and return the new value.

ACE_INLINE ACE_Message_Block::Message_Flags ACE_Message_Block::clr_self_flags (  ACE_Message_Block::Message_Flags    less_flags )

Clear the message flag bits specified in <less_flags> and return the new value.

ACE_INLINE void ACE_Message_Block::cont (  ACE_Message_Block *    )

Set the continuation field.

ACE_INLINE ACE_Message_Block * ACE_Message_Block::cont (  void    )  const

Get the continuation field.

int ACE_Message_Block::copy (  const char *    buf )

Copies a 0-terminated character string into this ACE_Message_Block. The string is copied into the block starting at the current write pointer. The 0-terminator is included in the copied data. Parameters: buf  Pointer to the character string to copy from. Return values: 0  on success; the write pointer is advanced by the string's length, including the 0 terminator. -1  if the amount of free space following the write pointer in the block is less than required to hold the entire string. Free space can be checked by calling space().

int ACE_Message_Block::copy (  const char *    buf, size_t    n )

Copies data into this ACE_Message_Block. Data is copied into the block starting at the current write pointer. Parameters: buf  Pointer to the buffer to copy from. n  The number of bytes to copy. Return values: 0  on success; the write pointer is advanced by n. -1  if the amount of free space following the write pointer in the block is less than n. Free space can be checked by calling space().

void ACE_Message_Block::crunch (  void    )

Normalizes data in the top-level <Message_Block> to align with the base, i.e., it "shifts" the data pointed to by <rd_ptr> down to the <base> and then readjusts <rt_ptr> to point to <base> and <wr_ptr> to point to <base> + the length of the moved data.

void ACE_Message_Block::data_block (  ACE_Data_Block *    )

Set a new data block pointer. The original <ACE_Data_Block> is released as a result of this call. If you need to keep the original block, call <replace_data_block> instead. Upon return, this <ACE_Message_Block> holds a pointer to the new <ACE_Data_Block>, taking over the reference you held on it prior to the call.

ACE_INLINE ACE_Data_Block * ACE_Message_Block::data_block (  void    )  const

Get a pointer to the data block. Note that the <ACE_Message_Block> still references the block; this call does not change the reference count.

void ACE_Message_Block::dump (  void    )  const

Dump the state of an object.

ACE_Message_Block * ACE_Message_Block::duplicate (  const ACE_Message_Block *    mb )  [static]

Return a "shallow" copy that increments our reference count by 1. This is similar to CORBA's <_duplicate> method, which is useful if you want to eliminate lots of checks for NULL <mb> pointers before calling <_duplicate> on them.

ACE_Message_Block * ACE_Message_Block::duplicate (  void    )  const [virtual]

Return a "shallow" copy that increments our reference count by 1.

ACE_INLINE char * ACE_Message_Block::end (  void    )  const

Return a pointer to 1 past the end of the allocated data in a message.

ACE_INLINE ACE_Message_Block::Message_Flags ACE_Message_Block::flags (  void    )  const

Get the current message flags.

int ACE_Message_Block::init (  size_t    size, ACE_Message_Type    type = MB_DATA, ACE_Message_Block *    cont = 0, const char *    data = 0, ACE_Allocator *    allocator_strategy = 0, ACE_Lock *    locking_strategy = 0, unsigned long    priority = ACE_DEFAULT_MESSAGE_BLOCK_PRIORITY, const ACE_Time_Value &    execution_time = ACE_Time_Value::zero, const ACE_Time_Value &    deadline_time = ACE_Time_Value::max_time, ACE_Allocator *    data_block_allocator = 0, ACE_Allocator *    message_block_allocator = 0 )

Create an initialized message of type <type> containing <size> bytes. The <cont> argument initializes the continuation field in the <Message_Block>. If <data> == 0 then we create and own the <data>, using <allocator> to get the data if it's non-0. If <data> != 0 we assume that we have ownership of the <data> till this object ceases to exist (and don't delete it during destruction). If <locking_strategy> is non-0 then this is used to protect regions of code that access shared state (e.g., reference counting) from race conditions. Note that the <size> of the <Message_Block> will be <size>, but the <length> will be 0 until <wr_ptr> is set. The <data_block_allocator> is use to allocate the data blocks while the <allocator_strategy> is used to allocate the buffers contained by those.

int ACE_Message_Block::init (  const char *    data, size_t    size = 0 )

Create a Message Block that assumes it has ownership of <data>, but in reality it doesnt (i.e., cannot delete it since it didn't malloc it!). Note that the <size> of the <Message_Block> will be <size>, but the <length> will be 0 until <wr_ptr> is set.

int ACE_Message_Block::init_i (  size_t    size, ACE_Message_Type    type, ACE_Message_Block *    cont, const char *    data, ACE_Allocator *    allocator_strategy, ACE_Lock *    locking_strategy, Message_Flags    flags, unsigned long    priority, const ACE_Time_Value &    execution_time, const ACE_Time_Value &    deadline_time, ACE_Data_Block *    db, ACE_Allocator *    data_block_allocator, ACE_Allocator *    message_block_allocator )  [protected]

Perform the actual initialization.

ACE_INLINE int ACE_Message_Block::is_data_msg (  void    )  const

Find out what type of message this is.

ACE_INLINE void ACE_Message_Block::length (  size_t    n )

Set the length of the message.

ACE_INLINE size_t ACE_Message_Block::length (  void    )  const

Get the length of the message.

ACE_INLINE ACE_Lock * ACE_Message_Block::locking_strategy (  ACE_Lock *    )

Set a new locking strategy and return the hold one.

ACE_INLINE ACE_Lock * ACE_Message_Block::locking_strategy (  void    )

Get the locking strategy.

ACE_INLINE char * ACE_Message_Block::mark (  void    )  const

Return a pointer to 1 past the end of the allotted data in a message. Allotted data may be less than allocated data if a value smaller than capacity() to is passed to size().

ACE_INLINE ACE_Message_Block::ACE_Message_Type ACE_Message_Block::msg_class (  void    )  const

Find out what class of message this is (there are two classes, <normal> messages and <high-priority> messages).

ACE_INLINE void ACE_Message_Block::msg_deadline_time (  const ACE_Time_Value &    dt )

Set absolute time of deadline associated with the message.

ACE_INLINE const ACE_Time_Value & ACE_Message_Block::msg_deadline_time (  void    )  const

Get absolute time of deadline associated with the message.

ACE_INLINE void ACE_Message_Block::msg_execution_time (  const ACE_Time_Value &    et )

Set execution time associated with the message.

ACE_INLINE const ACE_Time_Value & ACE_Message_Block::msg_execution_time (  void    )  const

Get execution time associated with the message.

ACE_INLINE void ACE_Message_Block::msg_priority (  unsigned long    priority )

Set priority of the message.

ACE_INLINE unsigned long ACE_Message_Block::msg_priority (  void    )  const

Get priority of the message.

ACE_INLINE void ACE_Message_Block::msg_type (  ACE_Message_Type    type )

Set type of the message.

ACE_INLINE ACE_Message_Block::ACE_Message_Type ACE_Message_Block::msg_type (  void    )  const

Get type of the message.

ACE_INLINE void ACE_Message_Block::next (  ACE_Message_Block *    )

Set link to next message.

ACE_INLINE ACE_Message_Block * ACE_Message_Block::next (  void    )  const

Get link to next message.

ACE_Message_Block & ACE_Message_Block::operator= (  const ACE_Message_Block &    )  [private]

ACE_INLINE void ACE_Message_Block::prev (  ACE_Message_Block *    )

Set link to prev message.

ACE_INLINE ACE_Message_Block * ACE_Message_Block::prev (  void    )  const

Get link to prev message.

ACE_INLINE void ACE_Message_Block::rd_ptr (  size_t    n )

Set the read pointer ahead <n> bytes.

ACE_INLINE void ACE_Message_Block::rd_ptr (  char *    ptr )

Set the read pointer to <ptr>.

ACE_INLINE char * ACE_Message_Block::rd_ptr (  void    )  const

Get the read pointer.

ACE_INLINE int ACE_Message_Block::reference_count (  void    )  const

Get the current reference count.

ACE_Message_Block * ACE_Message_Block::release (  ACE_Message_Block *    mb )  [static]

This behaves like the non-static method <release>, except that it checks if <mb> is 0. This is similar to <CORBA::release>, which is useful if you want to eliminate lots of checks for NULL pointers before calling <release> on them. Returns <mb>.

ACE_Message_Block * ACE_Message_Block::release (  void    )  [virtual]

Decrease the shared ACE_Data_Block's reference count by 1. If the ACE_Data_Block's reference count goes to 0, it is deleted. In all cases, this ACE_Message_Block is deleted - it must have come from the heap, or there will be trouble. release() is designed to release the continuation chain; the destructor is not. If we make the destructor release the continuation chain by calling release() or delete on the message blocks in the continuation chain, the following code will not work since the message block in the continuation chain is not off the heap: ACE_Message_Block mb1 (1024); ACE_Message_Block mb2 (1024); mb1.cont (&mb2); And hence, call release() on a dynamically allocated message block. This will release all the message blocks in the continuation chain. If you call delete or let the message block fall off the stack, cleanup of the message blocks in the continuation chain becomes the responsibility of the user. Return values: 0, always, and  the object this method was invoked on is no longer valid.

int ACE_Message_Block::release_i (  ACE_Lock *    lock )  [protected]

Internal release implementation Returns 1 if the data block has to be destroyed.

ACE_INLINE ACE_Data_Block * ACE_Message_Block::replace_data_block (  ACE_Data_Block *    )

Set a new data block pointer. A pointer to the original <ACE_Data_Block> is returned, and not released (as it is with <data_block>).

ACE_INLINE void ACE_Message_Block::reset (  void    )

Resets the Message Block data to contain nothing, i.e., sets the read and write pointers to align with the base.

ACE_INLINE void ACE_Message_Block::reset_allocators (  ACE_Allocator *    allocator_strategy = 0, ACE_Allocator *    data_block_allocator = 0, ACE_Allocator *    message_block_allocator = 0 )

This method resets the allocators in all the message blocks in the chain.

ACE_INLINE ACE_Message_Block::Message_Flags ACE_Message_Block::self_flags (  void    )  const

Get the current message flags.

ACE_INLINE ACE_Message_Block::Message_Flags ACE_Message_Block::set_flags (  Message_Flags    more_flags )

Bitwise-or the <more_flags> into the existing message flags and return the new value.

ACE_INLINE ACE_Message_Block::Message_Flags ACE_Message_Block::set_self_flags (  ACE_Message_Block::Message_Flags    more_flags )

Bitwise-or the <more_flags> into the existing message flags and return the new value.

int ACE_Message_Block::size (  size_t    length )

Set the number of bytes in the top-level <Message_Block>, reallocating space if necessary. However, the <rd_ptr_> and <wr_ptr_> remain at the original offsets into the buffer, even if it is reallocated. Returns 0 if successful, else -1.

ACE_INLINE size_t ACE_Message_Block::size (  void    )  const

Get the number of bytes in the top-level <Message_Block> (i.e., does not consider the bytes in chained <Message_Block>s).

ACE_INLINE size_t ACE_Message_Block::space (  void    )  const

Get the number of bytes available after the <wr_ptr_> in the top-level <Message_Block>.

size_t ACE_Message_Block::total_capacity (  void    )  const

Get the number of allocated bytes in all <Message_Block>, including chained <Message_Block>s.

size_t ACE_Message_Block::total_length (  void    )  const

Get the length of the <Message_Block>s, including chained <Message_Block>s.

size_t ACE_Message_Block::total_size (  void    )  const

Get the total number of bytes in all <Message_Block>s, including chained <Message_Block>s.

void ACE_Message_Block::total_size_and_length (  size_t &    mb_size, size_t &    mb_length )  const

Get the total number of bytes and total length in all <Message_Block>s, including chained <Message_Block>s.

ACE_INLINE void ACE_Message_Block::wr_ptr (  size_t    n )

Set the write pointer ahead <n> bytes. This is used to compute the <length> of a message.

ACE_INLINE void ACE_Message_Block::wr_ptr (  char *    ptr )

Set the write pointer to <ptr>.

ACE_INLINE char * ACE_Message_Block::wr_ptr (  void    )  const

Get the write pointer.

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Friends And Related Function Documentation

friend class ACE_Data_Block [friend]

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Member Data Documentation

ACE_Message_Block::ACE_ALLOC_HOOK_DECLARE

Declare the dynamic allocation hooks.

ACE_Message_Block* ACE_Message_Block::cont_ [protected]

Pointer to next message block in the chain.

ACE_Data_Block* ACE_Message_Block::data_block_ [protected]

Pointer to the reference counted data structure that contains the actual memory buffer.

ACE_Message_Block::Message_Flags ACE_Message_Block::flags_ [protected]

Misc flags (e.g., DONT_DELETE and USER_FLAGS).

ACE_Allocator* ACE_Message_Block::message_block_allocator_ [protected]

The allocator used to destroy ourselves when release is called and create new message blocks on duplicate.

ACE_Message_Block* ACE_Message_Block::next_ [protected]

Pointer to next message in the list.

ACE_Message_Block* ACE_Message_Block::prev_ [protected]

Pointer to previous message in the list.

unsigned long ACE_Message_Block::priority_ [protected]

Priority of message.

size_t ACE_Message_Block::rd_ptr_ [protected]

Pointer to beginning of next read.

size_t ACE_Message_Block::wr_ptr_ [protected]

Pointer to beginning of next write.

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The documentation for this class was generated from the following files:

• /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Message_Block.h
• /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Message_Block.cpp
• /export2/deucetmp/bala/release_try/ACE_wrappers/ace/Message_Block.i

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