Multiple Processes Per Address Space

Multiple Processes Per Address Space

      Disclosed is a method for multiple processes to run in the same
address space.  Each process runs independent of the other processes
in the address space, as if it were running in its own address space.

      To solve the problem of using too many address spaces to run
unix/POSIX like work on MVS, the OpenEdition MVS Kernel provides the
ability for multiple processes to run in the same address space.
This capability is provided in the following ways:
  1.  An application can use the OpenEdition MVS services Spawn
       (specifying "YES" for the _BPX_SHAREAS environment variable),
       Attach_exec and Attach_execmvs to create a child process to
       run a specific MVS or OpenEdition MVS HFS program in the
       same address space as the caller.  These services accomplish
       this by attaching a MVS subtask to the MVS task of the
       caller, dubbing the new task as an OpenEdition MVS child
       process of the calling process and then transferring control
       to the specified program.  The child process that is created
       inherits the same attributes that a child process would
       inherit after a fork and then an exec is issued to create a
       new child process.  The inheritance attributes of the child
       can be altered by use of the spawn service, which allows
       the remapping of file descriptors, setting of...