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Diffstat (limited to 'src/boost/libs/interprocess/example/doc_where_allocate.cpp')
-rw-r--r-- | src/boost/libs/interprocess/example/doc_where_allocate.cpp | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/boost/libs/interprocess/example/doc_where_allocate.cpp b/src/boost/libs/interprocess/example/doc_where_allocate.cpp new file mode 100644 index 00000000..c8f14f16 --- /dev/null +++ b/src/boost/libs/interprocess/example/doc_where_allocate.cpp @@ -0,0 +1,96 @@ +////////////////////////////////////////////////////////////////////////////// +// +// (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_where_allocate +#include <boost/interprocess/managed_shared_memory.hpp> +#include <boost/interprocess/containers/vector.hpp> +#include <boost/interprocess/containers/string.hpp> +#include <boost/interprocess/allocators/allocator.hpp> +//<- +#include "../test/get_process_id_name.hpp" +//-> + +int main () +{ + using namespace boost::interprocess; + //Typedefs + typedef allocator<char, managed_shared_memory::segment_manager> + CharAllocator; + typedef basic_string<char, std::char_traits<char>, CharAllocator> + MyShmString; + typedef allocator<MyShmString, managed_shared_memory::segment_manager> + StringAllocator; + typedef vector<MyShmString, StringAllocator> + MyShmStringVector; + + //Open shared memory + //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; + //-> + + //<- + #if 1 + managed_shared_memory shm(create_only, test::get_process_id_name(), 10000); + #else + //-> + managed_shared_memory shm(create_only, "MySharedMemory", 10000); + //<- + #endif + //-> + + //Create allocators + CharAllocator charallocator (shm.get_segment_manager()); + StringAllocator stringallocator(shm.get_segment_manager()); + + //This string is in only in this process (the pointer pointing to the + //buffer that will hold the text is not in shared memory). + //But the buffer that will hold "this is my text" is allocated from + //shared memory + MyShmString mystring(charallocator); + mystring = "this is my text"; + + //This vector is only in this process (the pointer pointing to the + //buffer that will hold the MyShmString-s is not in shared memory). + //But the buffer that will hold 10 MyShmString-s is allocated from + //shared memory using StringAllocator. Since strings use a shared + //memory allocator (CharAllocator) the 10 buffers that hold + //"this is my text" text are also in shared memory. + MyShmStringVector myvector(stringallocator); + myvector.insert(myvector.begin(), 10, mystring); + + //This vector is fully constructed in shared memory. All pointers + //buffers are constructed in the same shared memory segment + //This vector can be safely accessed from other processes. + MyShmStringVector *myshmvector = + shm.construct<MyShmStringVector>("myshmvector")(stringallocator); + myshmvector->insert(myshmvector->begin(), 10, mystring); + + //Destroy vector. This will free all strings that the vector contains + shm.destroy_ptr(myshmvector); + return 0; +} +//] +#include <boost/interprocess/detail/config_end.hpp> |