[Boost-bugs] [Boost C++ Libraries] #2741: proposal to manage portable and non portablethread attributes

Subject: [Boost-bugs] [Boost C++ Libraries] #2741: proposal to manage portable and non portablethread attributes
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-02-10 16:43:46

#2741: proposal to manage portable and non portablethread attributes
-------------------------------+--------------------------------------------
 Reporter:  viboes             |       Owner:  anthonyw      
     Type:  Feature Requests   |      Status:  new           
Milestone:  Boost 1.39.0       |   Component:  thread        
  Version:  Boost 1.37.0       |    Severity:  Not Applicable
 Keywords:  thread attributes  |  
-------------------------------+--------------------------------------------
 Boost.thread has already a non portable interface to get the thread handle

 {{{
 #!cpp
 class thread {
 public:
     ...
     typedef np_native_handle_type native_handle_type;
     native_handle_type native_handle();
     ...
 };
 }}}
 Boost.Thread do not allows to pass thread attributes on the thread
 constructor. I suppose that this is due to portable issues. Could we
 identify which attributes are portable and which one not?

 The portable attributes (as stack size, ...) can be grouped on a
 thread_attributes class.

 In order to be able to pass whatever attribute to the thread constructor
 we
 can add the setting of non portable attributes to this thread_attributes
 class, and making the thread constructor take a thread_attributes in
 addition to the existing parameters.

 {{{
 #!cpp
 class thread {
 public:
     class thread_attributes {
         // portable attributes

     public:
         typedef np_native_handle_type native_handle_type;
         native_handle_type native_handle();
         // set/get of attributes
         // ..
 #if defined(BOOST_THREAD_PLATFORM_WIN32)
 // ... window version
 #elif defined(BOOST_THREAD_PLATFORM_PTHREAD)
     private:
         pthread_attr_t native_attributes;
     public:
         thread_attributes() {
             pthread_attr_init(&native_attributes);
         }
         ~thread_attributes() {
             pthread_attr_destroy(&native_attributes);
         }

         // ... other
 #else
 #error "Boost threads unavailable on this platform"
 #endif
     };
     thread(const thread_attributes&p, F f,A1 a1);
 ...

 };
 }}}
 The portable application needing some specific configuration can construct
 portable threads using the following schema

 {{{
 #!cpp
         thread::thread_attributes attr;
         // set portable attributes
         // ...
         attr.set_stack_size(1000000)
     #if defined(BOOST_THREAD_PLATFORM_WIN32)
         // ... window version
     #elif defined(BOOST_THREAD_PLATFORM_PTHREAD)
         // ... pthread version
         pthread_attr_setschedpolicy(attr.get_native_handle(), SCHED_RR);
     #else
     #error "Boost threads unavailable on this platform"
     #endif
         thread th(attr, f,ctx);
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/2741>
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