Boost線程池

Boost 線程池位于組件 asio 中，是一種固定大小的線程池。

class thread_pool :public execution_context

Types

NameDescription

executor_type	Executor used to submit functions to a thread pool.
fork_event	Fork-related event notifications.

Member Functions

NameDescription

get_executor	Obtains the executor associated with the pool.
join	Joins the threads.
notify_fork	Notify the execution_context of a fork-related event.
stop	Stops the threads.
thread_pool()	Constructs a pool with an automatically determined number of threads.
thread_pool(std::size_t num_threads)	Constructs a pool with a specified number of threads.
~thread_pool	Destructor.

Protected Member Functions

NameDescription

destroy	Destroys all services in the context.
shutdown	Shuts down all services in the context.

Friends

NameDescription

add_service	(Deprecated: Use make_service().) Add a service object to the execution_context.
has_service	Determine if an execution_context contains a specified service type.
make_service	Creates a service object and adds it to the execution_context.
use_service	Obtain the service object corresponding to the given type.

To submit functions to the thread_pool, use the dispatch , post or defer free functions.

#include <iostream> #include <thread> #include <boost/asio.hpp>/* 互斥鎖 */ std::mutex mutex_iostream;void my_task( void ) {std::lock_guard<std::mutex> lg(mutex_iostream);std::cout.flush();std::cout << "This is my task." << std::endl;std::cout.flush(); }int main( int argc, const char **argv ) {/* 定義一個4線程的線程池 */boost::asio::thread_pool tp( 4 );/* 將函數(shù)投放到線程池 */for( int i=0; i<5; ++i ) {boost::asio::post( tp, my_task );}/* 將語句塊投放到線程池 */for( int i=0; i<5; ++i ) {boost::asio::post(tp,[](){std::lock_guard<std::mutex> lg( mutex_iostream );std::cout.flush();std::cout << "This is lambda task." << std::endl;std::cout.flush();});}/* 退出所有線程 */tp.join();system("PAUSE");return 0; }

Requirements

Header

• boost/asio/thread_pool.hpp

Convenience header

• boost/asio.hpp

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