[Stormdos-develop] SD-32 Multitasking and modules

[Juras <yb...@tu...>]

Hello stormdos-develop,

== execs.txt ===
SD-32 Multitasking and modules
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 The main item used for multi-tasking is called a CONTEXT.
 The context belongs to a PROCESS. A process can countain
 a lot of contexts. A process also makes so that the contexts
 of the same project have the same address space. A process
 maintains a list of used DLLs.
 
 
 CONTEXTs->PROCESS->MAIN_MODULE_IMAGE_ID
                    USED_DLLs_IDs
                    
                    
                    
                    
                    
 Executables and DLLs are managed alike by the same
 module manager. It registers unique DLLs and EXEs.
 Then returns IDs to that modules incrementing the
 reference counter of each. The module manager
 allocates memory, makes fix-up and automatically loads
 needed dependent modules and also makes all the
 necessary clean-up.

  
 Algorithm: function load_module()
 
 1) check whether that module has not been loaded
   - check if it is already used by the process,
     a) if so - exit.
     b) no - allocate structure
      
 2) increase ref. counter, allocate memory, fix-up
 3) enumerate dependencies, launch load_module for each
    store dependencies IDs in the stucture
 4) use loaded dependencies to make imports and exports meet


-- 
Best regards,
 Juras                          mailto:yb...@tu...