126940 - NSPR shared memory functions are not implemented in OS/2

Status: RESOLVED WONTFIX

(NSPR :: NSPR, defect, P3)

Description

[Julien Pierre]

The following functions :
PR_OpenSharedMemory
PR_AttachSharedMemory
PR_DetachSharedMemory
PR_CloseSharedMemory
PR_DeleteSharedMemory

all currently map to PR_NOT_IMPLEMENTED_ERROR on OS/2 today.

It is possible to implement them on OS/2 using
DosAllocSharedMem
DosGetSharedMem
DosFreeMem

From browsing the OS/2 API docs, I don't see OS/2 functions to implement the
"detach" or "close". This may be implemented transparently by refcount and/or
DosFreeMem may need to be used in all processes using the unnamed shared memory
block. I don't think I have used shared memory on OS/2 in a while, if ever.
There are samples for using it though, as well as docs.

Comment 1

[Julien Pierre]

This should be implemented in a new file, eg.
mozilla/nsprpub/pr/src/md/os2/os2shm.c

Once it's done,  the file 
mozilla/nsprpub/pr/src/memory/prshm.c should be modified at the top with the
following :

#elif defined PR_HAVE_OS2_NAMED_SHARED_MEMORY
/* OS/2 implementation is in pr/src/md/os2/os2shm.c */

Comment 2

[Mike Kaply [:mkaply]]

We're not going to implement shared memory function on OS/2.