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/* -*- C++ -*- */
//=============================================================================
/**
* @file MEM_IO.h
*
* $Id$
*
* @author Nanbor Wang <nanbor@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_MEM_IO_H
#define ACE_MEM_IO_H
#include /**/ "ace/pre.h"
#include "ace/SOCK.h"
#include "ace/MEM_SAP.h"
#include "ace/Memory_Pool.h"
#include "ace/Message_Block.h"
#include "ace/Process_Semaphore.h"
#include "ace/Process_Mutex.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#if (ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1)
class ACE_Export ACE_Reactive_MEM_IO : public ACE_MEM_SAP
{
public:
ACE_Reactive_MEM_IO (void);
virtual ~ACE_Reactive_MEM_IO (void);
/**
* Initialize the MEM_SAP object.
*
* @a options is used to pass in the Malloc_Options to initialize
* underlying ACE_MMAP.
*/
virtual int init (ACE_HANDLE handle,
const ACE_TCHAR *name,
MALLOC_OPTIONS *options);
/**
* Fetch location of next available data into <recv_buffer_>.
* As this operation read the address of the data off the socket
* using ACE::recv, <timeout> only applies to ACE::recv.
*/
virtual ssize_t recv_buf (ACE_MEM_SAP_Node *&buf,
int flags,
const ACE_Time_Value *timeout);
/**
* Wait to to <timeout> amount of time to send <buf>. If <send>
* times out a -1 is returned with <errno == ETIME>. If it succeeds
* the number of bytes sent is returned. */
virtual ssize_t send_buf (ACE_MEM_SAP_Node *buf,
int flags,
const ACE_Time_Value *timeout);
/**
* Convert the buffer offset <off> to absolute address to <buf>.
* Return the size of valid information containing in the <buf>,
* -1 if <shm_malloc_> is not initialized.
*/
ssize_t get_buf_len (const off_t off, ACE_MEM_SAP_Node *&buf);
};
#if defined (ACE_WIN32) || !defined (_ACE_USE_SV_SEM)
class ACE_Export ACE_MT_MEM_IO : public ACE_MEM_SAP
{
public:
typedef struct
{
ACE_MEM_SAP_Node::ACE_MEM_SAP_NODE_PTR head_;
ACE_MEM_SAP_Node::ACE_MEM_SAP_NODE_PTR tail_;
} MQ_Struct; // Structure for a simple queue
class Simple_Queue
{
public:
Simple_Queue (void);
Simple_Queue (MQ_Struct *mq);
int init (MQ_Struct *mq, ACE_MEM_SAP::MALLOC_TYPE *malloc);
int write (ACE_MEM_SAP_Node *new_msg);
ACE_MEM_SAP_Node *read (void);
private:
MQ_Struct *mq_;
ACE_MEM_SAP::MALLOC_TYPE *malloc_;
};
typedef struct
{
ACE_SYNCH_PROCESS_SEMAPHORE *sema_;
ACE_SYNCH_PROCESS_MUTEX *lock_;
Simple_Queue queue_;
} Channel;
ACE_MT_MEM_IO (void);
virtual ~ACE_MT_MEM_IO (void);
/**
* Initialize the MEM_SAP object.
*/
virtual int init (ACE_HANDLE handle,
const ACE_TCHAR *name,
MALLOC_OPTIONS *options);
/**
* Fetch location of next available data into <recv_buffer_>.
* As this operation read the address of the data off the socket
* using ACE::recv, <timeout> only applies to ACE::recv.
*/
virtual ssize_t recv_buf (ACE_MEM_SAP_Node *&buf,
int flags,
const ACE_Time_Value *timeout);
/**
* Wait to to <timeout> amount of time to send <buf>. If <send>
* times out a -1 is returned with <errno == ETIME>. If it succeeds
* the number of bytes sent is returned. */
virtual ssize_t send_buf (ACE_MEM_SAP_Node *buf,
int flags,
const ACE_Time_Value *timeout);
private:
Channel recv_channel_;
Channel send_channel_;
};
#endif /* ACE_WIN32 || !_ACE_USE_SV_SEM */
/**
* @class ACE_MEM_IO
*
* @brief Defines the methods for the ACE shared memeory wrapper I/O
* routines (e.g., send/recv).
* The shared memory transport uses ACE_SOCK_* class to
* implement the signaling mechanism so we can easily use the
* new mechanism with the Reactor pattern (which uses select
* under the hood.)
* ACE_MEM_Acceptor and ACE_MEM_Connector are used to establish
* connections. When a connection is established,
* ACE_MEM_Acceptor creates the MMAP file for data exchange and
* sends the location of the file (complete path name) to
* ACE_MEM_Connector thru the socket. ACE_MEM_Connector then
* reads the location of the file off the socket and opens up
* the same MMAP file. ACE_MEM_Stream at each side then
* contains a reference to the ACE_Mallo object using the same
* MMAP file.
* When sending information using methods provided in this
* class, ACE_MEM_IO requests a chunk of memory from the
* MALLOC_TYPE object, copy the data into the shared memory and
* send the memory offset (from the start of the ACE_Malloc)
* across the socket. This action also servers as a signal to
* the other end. The receiving side then reverses the
* procedures and copies the information into user buffer.
*/
class ACE_Export ACE_MEM_IO : public ACE_SOCK
{
public:
// = Initialization and termination methods.
/// Constructor.
ACE_MEM_IO (void);
/// Destructor.
~ACE_MEM_IO (void);
typedef enum
{
Reactive,
MT
} Signal_Strategy;
/**
* Initialize the MEM_SAP object.
*/
int init (const ACE_TCHAR *name,
ACE_MEM_IO::Signal_Strategy type = ACE_MEM_IO::Reactive,
ACE_MEM_SAP::MALLOC_OPTIONS *options = 0);
/**
* Finalizing the MEM_IO object. This method doesn't invoke
* the <remove> method.
*/
int fini (void);
/// Send an <n> byte buffer to the other process using shm_malloc_
/// connected thru the socket.
ssize_t send (const void *buf,
size_t n,
int flags) ;
/// Recv an <n> byte buffer from the shm_malloc_ thru connected socket.
ssize_t recv (void *buf,
size_t n,
int flags) ;
/// Send an <n> byte buffer to the other process using shm_malloc_
/// connected thru the socket.
ssize_t send (const void *buf,
size_t n) ;
/// Recv an <n> byte buffer from the shm_malloc_ thru connected socket.
ssize_t recv (void *buf,
size_t n) ;
/**
* Wait to to <timeout> amount of time to send up to <n> bytes into
* <buf> from <handle> (uses the <send> call). If <send> times out
* a -1 is returned with <errno == ETIME>. If it succeeds the
* number of bytes sent is returned.
*/
ssize_t send (const void *buf,
size_t n,
const ACE_Time_Value *timeout);
/**
* Wait to to <timeout> amount of time to send up to <n> bytes into
* <buf> from <handle> (uses the <send> call). If <send> times out
* a -1 is returned with <errno == ETIME>. If it succeeds the
* number of bytes sent is returned.
*/
ssize_t send (const void *buf,
size_t n,
int flags,
const ACE_Time_Value *timeout);
/**
* Wait to to <timeout> amount of time to send the <message_block>.
* If <send> times out a -1 is returned with <errno == ETIME>. If
* it succeeds the number of bytes sent is returned.
*/
ssize_t send (const ACE_Message_Block *message_block,
const ACE_Time_Value *timeout);
/**
* Wait up to <timeout> amount of time to receive up to <n> bytes
* into <buf> from <handle> (uses the <recv> call). If <recv> times
* out a -1 is returned with <errno == ETIME>. If it succeeds the
* number of bytes received is returned.
*/
ssize_t recv (void *buf,
size_t n,
const ACE_Time_Value *timeout);
/**
* Wait up to <timeout> amount of time to receive up to <n> bytes
* into <buf> from <handle> (uses the <recv> call). If <recv> times
* out a -1 is returned with <errno == ETIME>. If it succeeds the
* number of bytes received is returned.
*/
ssize_t recv (void *buf,
size_t n,
int flags,
const ACE_Time_Value *timeout);
/// Dump the state of an object.
void dump (void) const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
/// Return the local endpoint port number. Returns 0 if successful,
/// else -1.
/* int get_local_port (u_short &) const;
/// Return the port number of the remotely connected peer (if there
/// is one). Returns 0 if successful, else -1.
int get_remote_port (u_short &) const;
*/
private:
ssize_t fetch_recv_buf (int flag, const ACE_Time_Value *timeout);
/// Actual deliverying mechanism.
ACE_MEM_SAP *deliver_strategy_;
/// Internal pointer for support recv/send.
ACE_MEM_SAP_Node *recv_buffer_;
/// Record the current total buffer size of <recv_buffer_>.
ssize_t buf_size_;
/// Record the current read pointer location in <recv_buffer_>.
ssize_t cur_offset_;
};
#if defined (__ACE_INLINE__)
#include "ace/MEM_IO.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1 */
#include /**/ "ace/post.h"
#endif /* ACE_SOCK_IO_H */
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