#include <Asynch_IO.h>
Inheritance diagram for ACE_Asynch_Read_File:
Public Member Functions | |
ACE_Asynch_Read_File (void) | |
A do nothing constructor. | |
virtual | ~ACE_Asynch_Read_File (void) |
Destructor. | |
int | open (ACE_Handler &handler, ACE_HANDLE handle=ACE_INVALID_HANDLE, const void *completion_key=0, ACE_Proactor *proactor=0) |
int | read (ACE_Message_Block &message_block, size_t bytes_to_read, unsigned long offset=0, unsigned long offset_high=0, const void *act=0, int priority=0, int signal_number=ACE_SIGRTMIN) |
int | readv (ACE_Message_Block &message_block, size_t bytes_to_read, unsigned long offset=0, unsigned long offset_high=0, const void *act=0, int priority=0, int signal_number=ACE_SIGRTMIN) |
virtual ACE_Asynch_Operation_Impl * | implementation (void) const |
Return the underlying implementation class. | |
Protected Attributes | |
ACE_Asynch_Read_File_Impl * | implementation_ |
Once {open} is called, multiple asynchronous {read}s can started using this class. An ACE_Asynch_Read_File::Result will be passed back to the {handler} when the asynchronous reads completes through the {ACE_Handler::handle_read_file} callback. This class differs slightly from ACE_Asynch_Read_Stream as it allows the user to specify an offset for the read.
Definition at line 550 of file Asynch_IO.h.
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A do nothing constructor.
Definition at line 360 of file Asynch_IO.cpp.
00361 : implementation_ (0) 00362 { 00363 } |
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Destructor.
Definition at line 365 of file Asynch_IO.cpp.
00366 { 00367 // Delete the implementation. 00368 delete this->implementation_; 00369 this->implementation_ = 0; 00370 } |
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Return the underlying implementation class.
Reimplemented from ACE_Asynch_Read_Stream. Definition at line 431 of file Asynch_IO.cpp.
00432 { 00433 return this->implementation_; 00434 } |
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Initializes the factory with information which will be used with each asynchronous call. If ({handle} == ACE_INVALID_HANDLE), {ACE_Handler::handle} will be called on the {handler} to get the correct handle. Reimplemented from ACE_Asynch_Read_Stream. Definition at line 373 of file Asynch_IO.cpp. References ACE_Proactor::create_asynch_read_file(), ACE_Asynch_Operation::get_proactor(), and ACE_Asynch_Operation::open().
00377 { 00378 // Get a proactor for/from the user. 00379 proactor = this->get_proactor (proactor, handler); 00380 00381 // Now let us get the implementation initialized. 00382 if ((this->implementation_ = proactor->create_asynch_read_file ()) == 0) 00383 return -1; 00384 00385 // Call the <open> method of the base class. 00386 return ACE_Asynch_Operation::open (handler, 00387 handle, 00388 completion_key, 00389 proactor); 00390 } |
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This starts off an asynchronous read. Upto {bytes_to_read} will be read and stored in the {message_block}. The read will start at {offset} from the beginning of the file. Priority of the operation is specified by {priority}. On POSIX4-Unix, this is supported. Works like {nice} in Unix. Negative values are not allowed. 0 means priority of the operation same as the process priority. 1 means priority of the operation is one less than process. And so forth. On Win32, this argument is a no-op. {signal_number} is the POSIX4 real-time signal number to be used for the operation. {signal_number} ranges from ACE_SIGRTMIN to ACE_SIGRTMAX. This argument is a no-op on non-POSIX4 systems. Definition at line 393 of file Asynch_IO.cpp. References ACE_Asynch_Read_File_Impl::read().
00400 { 00401 return this->implementation_->read (message_block, 00402 bytes_to_read, 00403 offset, 00404 offset_high, 00405 act, 00406 priority, 00407 signal_number); 00408 } |
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Same as above but with scatter support, through chaining of composite message blocks using the continuation field.
Definition at line 412 of file Asynch_IO.cpp. References ACE_Asynch_Read_File_Impl::readv().
00419 { 00420 return this->implementation_->readv (message_block, 00421 bytes_to_read, 00422 offset, 00423 offset_high, 00424 act, 00425 priority, 00426 signal_number); 00427 } |
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Delegation/implementation class that all methods will be forwarded to. Reimplemented from ACE_Asynch_Read_Stream. Definition at line 615 of file Asynch_IO.h. |