1. Implement multi-Threading method:It's actually multiple threads calling Io_service::run at the same timefor (int i = 0; I! = m_nthreads; ++i){Boost::shared_ptrBoost::bind (boost::asio::io_service::run,m_ioservice));M_listthread.push_back (PTH);}2, multi-threaded scheduling situation:ASIO specifies that the event completion processor can only be called in a thread that calls Io_service::run.Note: The event completion processor is your async_accept,
Boost. Asio c ++ network programming translation (26), boost. asio Network ProgrammingBoost. Asio-Other Features This chapter describes some features that Boost. Asio is not so well known. Standard stream and streambuf objects are sometimes more difficult to use, but as you can see, they also have their benefits. Final
1. Overview
Generally, most of the types we create for receiving errors are declared as follows:
boost::system::error_code error
We use this type to accept Errors generated in functions, such:
socket.connect(endpoint, error);
If the connection fails, the error type will be saved to error. For example, if the connection to the host fails, this error may be returned.
boost::asio::error::host_not_found;
If (error) throws an exception after detecting the
Boost. Asio c ++ network programming translation (21), boost. asio Network ProgrammingThe author of synchronous VS asynchronous Boost. Asio made a very amazing job: it allows you to freely choose between synchronous and asynchronous, so as to better adapt to your application. In the previous sections, we learned the frameworks of each type of application, such as
Boost. Asio c ++ network programming translation (20), boost. asio Network ProgrammingThe Asynchronous Server chart is quite complex. From Boost. Asio, You can see four arrows pointing to on_accept, on_read, on_write, and on_check_ping. That means you never know which asynchronous call is the next complete call, but you can be sure that it is one of the four oper
Boost. Asio c ++ network programming translation (24), boost. asio Network ProgrammingMultithreading In the Asynchronous Server I have displayed on the client and the server in Chapter 4th. The Asynchronous Server is single-threaded, and all things happen in main:
int main() { talk_to_client::ptr client = talk_to_client::new_(); acc.async_accept(client->sock(), boost::bind(handle_
accept,client,
used at the operating system level.
The most significant difference is that, at TCP distance, the Reactor will notify the upper-layer application when the kernel receives TCP data, the following code extracts data from the kernel and calls the processing function for processing (when and how ). After receiving data from TCP, The Proactor will copy the data to the specified space by the kernel, and then immediately call the registered callback function for processing.
It seems that Proactor is
////Async_client.cpp// ~~~~~~~~~~~~~~~~//an asynchronous HTTP client that is very similar to synchronization. The difference is the last point where the loop is synchronized//Copyright (c) 2003-2013 Christopher M. Kohlhoff (Chris at kohlhoff dot com)////distributed under the Boost software License, Version 1.0. (See accompanying//file license_1_0.txt or copy atHttp://www.boost.org/LICENSE_1_0.txt)//#include#include#include#includestring>#include#includeusingboost::
//Daemon.cpp//This example shows a fork system call that combines the ASIO and POSIX standard systems to produce a daemon. //time server? //Copyright (c) 2003-2014 Christopher M. Kohlhoff (Chris at kohlhoff dot com)////distributed under the Boost software License, Version 1.0. (See accompanying//file license_1_0.txt or copy atHttp://www.boost.org/LICENSE_1_0.txt)//#include#include#include#include#include#include#include#include#includeusingboost::
Create a buffer
In io operations, read and write data mostly in a buffer zone. In the asio framework, you can use the asio: buffer function to create a buffer zone to provide data read and write. The buffer function does not apply for memory, but provides an encapsulation of the existing memory.
Char d1 [128];Size_t bytes_transferred = sock. receive (asio: buffe
TCP: resolver is generally used in combination with TCP: resolver: Query. You can use the word "query" to obtain the corresponding information of the socket, generally, we care about the address and port of socket. through TCP: resolver, it is easy to set and query. It uses query to set the IP address in string format, such as 192.168.0.200 or the Host Name HTTP: // The localhost and port "8080" are converted into the internal representation format of the socket, so that we can directly use the
Before using ASIO, you must first understand its design ideas. Understanding the design ideas will help us understand and apply ASIO. ASIO is based on the proactor mode. The proactor mode of ASIO is hidden in a large number of details. To find its trace, there is often a sense that the tree does not see the forest. The
(Original) Open the fog to see the moon-analyze the proactor mode in asio (2), asioproactor
In the previous blog, we mentioned that asynchronous requests are forwarded from the upper layer to the win_iocp_socket_service object at the bottom of the service layer, which forwards requests to the Operating System (Calling windows APIs ), how does the operating system return the result to the application after processing the asynchronous request? Here, it
BOOST. Asio, boost
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Ace is a very mature middleware product. It is an adaptive communication environment, but it is too ambitious. There are a bunch of design patterns, and the architecture is layer after layer. It is a little difficult for beginners.
ASIO is a basic asynchronous Io library developed by boost. It encapsulates socket and simplifies socket-based
Program Development.
Recently analyzed ASIO
Source code I was sur
////Sync_client.cpp// ~~~~~~~~~~~~~~~//HTTP client, synchronizing//Copyright (c) 2003-2013 Christopher M. Kohlhoff (Chris at kohlhoff dot com)////distributed under the Boost software License, Version 1.0. (See accompanying//file license_1_0.txt or copy atHttp://www.boost.org/LICENSE_1_0.txt)//#include#include#include#includestring>#includeusingboost::asio::ip::tcp;intMainintargcChar*argv[]) { Try { if(ARGC! =3) {Std::cout"usage:sync_client "; Std
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