'boost::interprocess::basic_managed_shared_memory 中没有名为 'get_mapping_handle' 的成员

Question

我正在尝试编译一些 boost 代码，但出现以下错误

这是代码的简化版

#include <boost/interprocess/managed_shared_memory.hpp>
using namespace boost::interprocess;
int main()
{
      managed_shared_memory shmem(create_only, "MySharedMemory", sizeof(TransferData));
      mapped_region region(shmem, read_write);
}

但我遇到了这个问题

In file included from holster/src/main.cc:6:
In file included from external/boost/boost/interprocess/managed_shared_memory.hpp:26:
In file included from external/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:26:
external/boost/boost/interprocess/mapped_region.hpp:594:39: error: no member named 'get_mapping_handle' in 'boost::interprocess::basic_managed_shared_memory<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, int, unsigned int, 0>, 0>, iset_index>'
   mapping_handle_t map_hnd = mapping.get_mapping_handle();
                              ~~~~~~~ ^
holster/src/main.cc:96:21: note: in instantiation of function template specialization 'boost::interprocess::mapped_region::mapped_region<boost::interprocess::basic_managed_shared_memory<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, int, unsigned int, 0>, 0>, iset_index> >' requested here
      mapped_region region(shmem, read_write, 1000);
                    ^
In file included from holster/src/main.cc:6:
In file included from external/boost/boost/interprocess/managed_shared_memory.hpp:26:
In file included from external/boost/boost/interprocess/detail/managed_open_or_create_impl.hpp:26:
external/boost/boost/interprocess/mapped_region.hpp:702:32: error: no member named 'get_mapping_handle' in 'boost::interprocess::basic_managed_shared_memory<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, int, unsigned int, 0>, 0>, iset_index>'
                     , mapping.get_mapping_handle().handle
                       ~~~~~~~ ^

这是我正在使用的 boost 版本

Version: 1.71.0.0ubuntu2

Answer 1

这是一个极好的最小化示例。

它清楚地显示了你做错了什么。您正在托管段上使用映射区域。这不是他们的目的，甚至不是支持：

Also:

一旦创建或打开，进程只需将共享内存对象映射到进程的地址空间。用户可以映射整个共享内存或只是其中的一部分。映射过程是使用 ma​​pped_region 类完成的。该类表示已从共享内存或其他具有映射功能的设备（例如文件）映射的内存区域。可以从任何 memory_mappable 对象创建 mapped_region，正如您可能想象的那样，shared_memory_object 是一个 memory_mappable 对象 [...]

我找不到明确的列表，但据我所知，这里是满足memory_mappable 要求的模型列表：

• boost::interprocess::file_mapping
• boost::interprocess::shared_memory_object
• boost::interprocess::xsi_shared_memory

此外，您正在为细分指定 sizeof(TransferData)，这首先是行不通的：Why does boost::interprocess::managed_shared_memory throw a boost::interprocess_exception upon construction?