boost/interprocess
2
0
Fork 0
mirror of https://github.com/boostorg/interprocess.git synced 2026-01-19 04:12:13 +00:00
Code Issues Projects Releases Wiki Activity

Changes for Boost.1.39

Browse Source 
[SVN r51964]
This commit is contained in:
Ion Gaztañaga
2009-03-24 21:52:06 +00:00
parent 814c51a803
commit 3d0fcd68e3
274 changed files with 23335 additions and 20691 deletions
Download Patch File Download Diff File Expand all files Collapse all files

77
example/doc_cached_adaptive_pool.cpp
View File

@@ -18,54 +18,53 @@ using namespace boost::interprocess;
int main ()
{
shared_memory_object::remove("MySharedMemory");
try{
//Create shared memory
managed_shared_memory segment(create_only,
"MySharedMemory", //segment name
65536);
//Remove shared memory on construction and destruction
struct shm_destroy
{
shm_destroy() { shared_memory_object::remove("MySharedMemory"); }
~shm_destroy(){ shared_memory_object::remove("MySharedMemory"); }
} remover;
//Create a cached_adaptive_pool that allocates ints from the managed segment
//The number of chunks per segment is the default value
typedef cached_adaptive_pool<int, managed_shared_memory::segment_manager>
cached_adaptive_pool_t;
cached_adaptive_pool_t allocator_instance(segment.get_segment_manager());
//Create shared memory
managed_shared_memory segment(create_only,
"MySharedMemory", //segment name
65536);
//The max cached nodes are configurable per instance
allocator_instance.set_max_cached_nodes(3);
//Create a cached_adaptive_pool that allocates ints from the managed segment
//The number of chunks per segment is the default value
typedef cached_adaptive_pool<int, managed_shared_memory::segment_manager>
cached_adaptive_pool_t;
cached_adaptive_pool_t allocator_instance(segment.get_segment_manager());
//Create another cached_adaptive_pool. Since the segment manager address
//is the same, this cached_adaptive_pool will be
//attached to the same pool so "allocator_instance2" can deallocate
//nodes allocated by "allocator_instance"
cached_adaptive_pool_t allocator_instance2(segment.get_segment_manager());
//The max cached nodes are configurable per instance
allocator_instance.set_max_cached_nodes(3);
//The max cached nodes are configurable per instance
allocator_instance2.set_max_cached_nodes(5);
//Create another cached_adaptive_pool. Since the segment manager address
//is the same, this cached_adaptive_pool will be
//attached to the same pool so "allocator_instance2" can deallocate
//nodes allocated by "allocator_instance"
cached_adaptive_pool_t allocator_instance2(segment.get_segment_manager());
//Create another cached_adaptive_pool using copy-constructor. This
//cached_adaptive_pool will also be attached to the same pool
cached_adaptive_pool_t allocator_instance3(allocator_instance2);
//The max cached nodes are configurable per instance
allocator_instance2.set_max_cached_nodes(5);
//We can clear the cache
allocator_instance3.deallocate_cache();
//Create another cached_adaptive_pool using copy-constructor. This
//cached_adaptive_pool will also be attached to the same pool
cached_adaptive_pool_t allocator_instance3(allocator_instance2);
//All allocators are equal
assert(allocator_instance == allocator_instance2);
assert(allocator_instance2 == allocator_instance3);
//We can clear the cache
allocator_instance3.deallocate_cache();
//So memory allocated with one can be deallocated with another
allocator_instance2.deallocate(allocator_instance.allocate(1), 1);
allocator_instance3.deallocate(allocator_instance2.allocate(1), 1);
//All allocators are equal
assert(allocator_instance == allocator_instance2);
assert(allocator_instance2 == allocator_instance3);
//The common pool will be destroyed here, since no allocator is
//attached to the pool
}
catch(...){
shared_memory_object::remove("MySharedMemory");
throw;
}
shared_memory_object::remove("MySharedMemory");
//So memory allocated with one can be deallocated with another
allocator_instance2.deallocate(allocator_instance.allocate(1), 1);
allocator_instance3.deallocate(allocator_instance2.allocate(1), 1);
//The common pool will be destroyed here, since no allocator is
//attached to the pool
return 0;
}
//]