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--Copyright: Matra Datavision 1992,1993
-- File: OSD_SharedMemory.cdl
-- Created: Fri 21 1992
-- Author: Stephan GARNAUD (ARM)
-- <sga@sparc4>
class SharedMemory from OSD
---Purpose: IPC Tools -Shared Memory
-- This is a low level interface for communications.
-- Using shared memory, processes can use a common area to
-- communicate.
-- You can create and delete a shared memory.
uses Error, AsciiString from TCollection
raises ConstructionError, NullObject, OSDError, ProgramError
is
Create returns SharedMemory;
---Purpose: Allocates room for shared memory name.
-- This is to be used with 'Open'.
-- In this case, the process is a client of shared memory.
---Level: Advanced
Create (Name : AsciiString ; size : Integer) returns SharedMemory
---Purpose: Instantiates SharedMemory object with parameters.
-- A name to make sure shared memory is unique and a size in
-- bytes for the size of shared memory.
--
-- Raises ConstructionError when the name contains characters
-- not in range of ' '...'~'.
-- Raises ProgramError when the size given is negative or null.
-- This is for a server process.
--
---Level: Advanced
raises ConstructionError, ProgramError;
Build (me : in out) is static;
---Purpose: Creates a shared memory in the system
-- This is for a server process.
---Level: Advanced
Open (me : in out ; Name : AsciiString ; size : Integer)
---Purpose: Opens a shared memory
-- Raises ConstructionError when the name contains characters
-- not in range of ' '...'~'.
-- Raises ProgramError when the size given is negative or null.
-- This is for a server process.
--
---Level: Advanced
raises ConstructionError, ProgramError is static;
Delete (me : in out)
---Purpose: Removes a shared memory access.
-- This is used only by a server process !
---Level: Advanced
raises ProgramError is static;
GiveAddress (me) returns Address
---Purpose: Returns address of shared memory.
-- Raises NullObject when the Shared Memory is not created.
---Level: Advanced
raises NullObject is static;
Failed (me) returns Boolean is static;
---Purpose: Returns TRUE if an error occurs
---Level: Advanced
Reset (me : in out) is static;
---Purpose: Resets error counter to zero
---Level: Advanced
Perror (me : in out)
---Purpose: Raises OSD_Error
---Level: Advanced
raises OSDError is static;
Error (me) returns Integer is static;
---Purpose: Returns error number if 'Failed' is TRUE.
---Level: Advanced
fields
myId : Integer; -- Shared memory ID
myAddress : Address;
myName : AsciiString;
mySize : Integer;
myError : Error;
end SharedMemory from OSD;
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