boost::interprocess ubuntu exception on creating managed shared memory object

Question

I am newbie in boost. I am trying to use shared memory to communicate between processes using boost.

It works perfectly on my windows using vs2010 with 4 processes sharing memory with a manager. The manager initiates the shared memory mechanism before the other processes are launched.

However, I am getting an interprocess_exception on Ubuntu 14 running inside VirtualBox. I am using boost 1.58 and intel compiler. Same code works on windows using vs2010.

struct shm_remove 
{
  shm_remove() { shared_memory_object::remove("MySharedMemory1"); }
  ~shm_remove() { shared_memory_object::remove("MySharedMemory1"); }
} cleaner;

// exception occurs in the next line 
managed_shared_memory sharedMemSegment = managed_shared_memory(boost::interprocess::create_only, "MySharedMemory1", 65536);

exact error : "terminate called after throwing an instance of 'boost::interprocess::interprocess_exception' what(): No such file or directory

Changing to boost::interprocess::open_or_create did not work.

Help is much appreciated.

if you use open_or_create do you get the same error in the exeption? — Hayt, Sep 09 '16 at 10:44
Yes , same exception , same message "No such file or directory" — user1130254, Sep 10 '16 at 04:55
While debugging boost I've found out that it uses FILESYSTEM_BASED shared memory and it failes in opening the file name for my shared memory. Using sudo when running my app doesn't help , is there another shared mem mechanism , not file based ? — user1130254, Sep 11 '16 at 05:54
non-name based only when you fork the processes I guess. have you checked those things? http://stackoverflow.com/questions/30850686/reasons-a-user-might-not-be-able-to-open-a-shared-memory-object-on-linux-systems usually for me it has been problems with /dev/shm on a virtual machine sometimes. — Hayt, Sep 12 '16 at 07:23
Try the [XSI](https://www.boost.org/doc/libs/1_71_0/doc/html/interprocess/sharedmemorybetweenprocesses.html#interprocess.sharedmemorybetweenprocesses.sharedmemory) SYSTEM 5 shared memory for Linux. — Victor Gubin, Sep 05 '19 at 15:35

score 0 · Answer 1 · answered Mar 06 '23 at 11:13

Do not use any "/" in the shared_memory_object name.

Why

The "/" character confuses boost, because on macOS the shared memory objects are stored in the file system, in a temporary folder called boost_interprocess.

In macOS 12.6.3 you can find this folder in /tmp/boost_interprocesses.

boost::interprocess ubuntu exception on creating managed shared memory object

1 Answers1

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