Boost Memory Library: boost-memory-0.1.01

Exception Semantics

I update GC Allocator specification now. See the example named "testExceptionSemantics".

The following is the new minimum specification for GC Allocator:

typedef void (*DestructorType)(void* data);
 
concept GCAllocator
{
    // Allocate memory without given a cleanup function
    void* allocate(size_t cb);
 
    // Allocate unmanaged memory with a cleanup function
    void* unmanaged_alloc(size_t cb, DestructorType fn);
 
    // Commit unmanaged memory to be managed.
    void* manage(void* p, destructor_t fn);
 
    // Deprecated: allocate memory with a cleanup function
    void* allocate(size_t cb, DestructorType fn) {
        return manage(unmanaged_alloc(cb, fn), fn);
    }
 
    // Cleanup and deallocate all allocated memory by this GC Allocator
    void clear();
 
    // Swap two GCAllocator instances
    void swap(GCAllocator& o);
};

See http://svn.boost.org/trac/boost/ticket/1879

Thank Steven Watanabe and Scott McMurray.

Performance Comparison

I toke a performance comparison of

  • boost::memory::auto_alloc
  • boost::memory::scoped_alloc (use tls_block_pool::instance)
  • boost::memory::scoped_alloc
  • boost::memory::gc_alloc (auto)
  • boost::memory::gc_alloc (manually)
  • boost::pool (auto)
  • boost::object_pool (auto)
  • new/delete (gcc)
  • mt_allocator (gnu c++)

Here (auto) means recycling objects when allocators' destructor is called. and (manually) means deleting objects manually.

TestCase: performance.cpp
Output: output.txt
See: http://winx.googlecode.com/svn/tags/boost-memory-0.1.01/

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