boost线程池 [英] boost threadpool
问题描述
我试图用boost threadpool库创建一个线程池,但在定义它,我不断收到很多错误模板params是错误的。
I'm trying to create a threadpool with the boost threadpool library, but on defining it I keep getting lots of error about template params being wrong.
m可能做某事从根本上错了,但我没有看到它?
I'm probably doing something fundamentally wrong, but I'm not seeing it?
//Threadpool
typedef boost::threadpool::thread_pool<
boost::threadpool::task_func,
boost::threadpool::fifo_scheduler<tsk>,
boost::threadpool::static_size<boost::threadpool::fifo_pool>,
boost::threadpool::resize_controller<boost::threadpool::fifo_pool>,
boost::threadpool::wait_for_active_tasks<boost::threadpool::fifo_pool>
> pool;
错误:
------ Build started: Project: Trial, Configuration: Debug Win32 ------
Compiling...
Trial.cpp
error C2923: 'boost::threadpool::fifo_scheduler' : 'tsk' is invalid as template argument '#1', type expected
see declaration of 'tsk'
error C3200: 'boost::threadpool::fifo_pool' : invalid template argument for template parameter 'SizePolicy', expected a class template
error C3200: 'boost::threadpool::resize_controller<Pool>' : invalid template argument for template parameter 'SizePolicyController', expected a class template
with
[
Pool=boost::threadpool::fifo_pool
]
error C3200: 'boost::threadpool::wait_for_active_tasks<Pool>' : invalid template argument for template parameter 'ShutdownPolicy', expected a class template
with
[
Pool=boost::threadpool::fifo_pool
]
error C3200: 'boost::threadpool::fifo_pool' : invalid template argument for template parameter 'SizePolicy', expected a class template
see reference to class template instantiation 'boost::threadpool::thread_pool<Task,SchedulingPolicy,SizePolicy,SizePolicyController,ShutdownPolicy>' being compiled
with
[
Task=boost::threadpool::task_func,
SchedulingPolicy=boost::threadpool::fifo_scheduler,
SizePolicy=boost::threadpool::fifo_pool,
SizePolicyController=boost::threadpool::resize_controller<boost::threadpool::fifo_pool>,
ShutdownPolicy=boost::threadpool::wait_for_active_tasks<boost::threadpool::fifo_pool>
]
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(79) : error C3200: 'boost::threadpool::resize_controller<Pool>' : invalid template argument for template parameter 'SizePolicyController', expected a class template
with
[
Pool=boost::threadpool::fifo_pool
]
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(79) : error C3200: 'boost::threadpool::wait_for_active_tasks<Pool>' : invalid template argument for template parameter 'ShutdownPolicy', expected a class template
with
[
Pool=boost::threadpool::fifo_pool
]
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(91) : error C2059: syntax error : '<'
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(91) : error C2238: unexpected token(s) preceding ';'
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(92) : error C2059: syntax error : '<'
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(92) : error C2238: unexpected token(s) preceding ';'
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(111) : error C2146: syntax error : missing ';' before identifier 'size_controller'
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(111) : error C2501: 'boost::threadpool::thread_pool<Task,SchedulingPolicy,SizePolicy,SizePolicyController,ShutdownPolicy>::size_controller_type' : missing storage-class or type specifiers
with
[
Task=boost::threadpool::task_func,
SchedulingPolicy=boost::threadpool::fifo_scheduler,
SizePolicy=boost::threadpool::fifo_pool,
SizePolicyController=boost::threadpool::resize_controller<boost::threadpool::fifo_pool>,
ShutdownPolicy=boost::threadpool::wait_for_active_tasks<boost::threadpool::fifo_pool>
]
c:\Program Files\boost\boost_1_44\boost\threadpool\pool.hpp(112) : warning C4183: 'size_controller': missing return type; assumed to be a member function returning 'int'
---------------------- Done ----------------------
Build: 0 succeeded, 1 failed, 0 skipped
推荐答案
根据你的意见, tsk
是一个变量。您不能将运行时表达式(例如变量)作为模板参数。
According to your comment, tsk
is a variable. You can't pass runtime expressions (such as a variable) as template parameters. Templates are entirely compile-time.
对于这个特定的问题,你只需要这样做:
For this specific problem, you just need to do this:
typedef boost::threadpool::thread_pool<> pool;
void taskfunc();
// later on...
pool my_pool;
my_pool.schedule(&taskfunc);
boost :: threadpool :: task_func
只是一个 boost :: function0< void>
—任何0-arg void函数指针可以转换为该类型。
boost::threadpool::task_func
is just a boost::function0<void>
— any 0-arg void function pointer can convert to that type.
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