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- //////////////////////////////////////////////////////////////////////////////
- //
- // (C) Copyright Ion Gaztanaga 2006-2012. Distributed under the Boost
- // Software License, Version 1.0. (See accompanying file
- // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- // See http://www.boost.org/libs/interprocess for documentation.
- //
- //////////////////////////////////////////////////////////////////////////////
- #include <boost/interprocess/detail/config_begin.hpp>
- #include <boost/interprocess/detail/workaround.hpp>
- //[doc_intrusive
- #include <boost/interprocess/managed_shared_memory.hpp>
- #include <boost/interprocess/smart_ptr/intrusive_ptr.hpp>
- //<-
- #include "../test/get_process_id_name.hpp"
- //->
- using namespace boost::interprocess;
- namespace N {
- //A class that has an internal reference count
- class reference_counted_class
- {
- private:
- //Non-copyable
- reference_counted_class(const reference_counted_class &);
- //Non-assignable
- reference_counted_class & operator=(const reference_counted_class &);
- //A typedef to save typing
- typedef managed_shared_memory::segment_manager segment_manager;
- //This is the reference count
- unsigned int m_use_count;
- //The segment manager allows deletion from shared memory segment
- offset_ptr<segment_manager> mp_segment_manager;
- public:
- //Constructor
- reference_counted_class(segment_manager *s_mngr)
- : m_use_count(0), mp_segment_manager(s_mngr){}
- //Destructor
- ~reference_counted_class(){}
- public:
- //Returns the reference count
- unsigned int use_count() const
- { return m_use_count; }
- //Adds a reference
- inline friend void intrusive_ptr_add_ref(reference_counted_class * p)
- { ++p->m_use_count; }
- //Releases a reference
- inline friend void intrusive_ptr_release(reference_counted_class * p)
- { if(--p->m_use_count == 0) p->mp_segment_manager->destroy_ptr(p); }
- };
- } //namespace N {
- //A class that has an intrusive pointer to reference_counted_class
- class intrusive_ptr_owner
- {
- typedef intrusive_ptr<N::reference_counted_class,
- offset_ptr<void> > intrusive_ptr_t;
- intrusive_ptr_t m_intrusive_ptr;
- public:
- //Takes a pointer to the reference counted class
- intrusive_ptr_owner(N::reference_counted_class *ptr)
- : m_intrusive_ptr(ptr){}
- };
- int main()
- {
- //Remove shared memory on construction and destruction
- struct shm_remove
- {
- //<-
- #if 1
- shm_remove() { shared_memory_object::remove(test::get_process_id_name()); }
- ~shm_remove(){ shared_memory_object::remove(test::get_process_id_name()); }
- #else
- //->
- shm_remove() { shared_memory_object::remove("MySharedMemory"); }
- ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
- //<-
- #endif
- //->
- } remover;
- //<-
- (void)remover;
- //->
- //Create shared memory
- //<-
- #if 1
- managed_shared_memory shmem(create_only, test::get_process_id_name(), 10000);
- #else
- //->
- managed_shared_memory shmem(create_only, "MySharedMemory", 10000);
- //<-
- #endif
- //->
- //Create the unique reference counted object in shared memory
- N::reference_counted_class *ref_counted =
- shmem.construct<N::reference_counted_class>
- ("ref_counted")(shmem.get_segment_manager());
- //Create an array of ten intrusive pointer owners in shared memory
- intrusive_ptr_owner *intrusive_owner_array =
- shmem.construct<intrusive_ptr_owner>
- (anonymous_instance)[10](ref_counted);
- //Now test that reference count is ten
- if(ref_counted->use_count() != 10)
- return 1;
- //Now destroy the array of intrusive pointer owners
- //This should destroy every intrusive_ptr and because of
- //that reference_counted_class will be destroyed
- shmem.destroy_ptr(intrusive_owner_array);
- //Now the reference counted object should have been destroyed
- if(shmem.find<intrusive_ptr_owner>("ref_counted").first)
- return 1;
- //Success!
- return 0;
- }
- //]
- #include <boost/interprocess/detail/config_end.hpp>
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