Execution Scheduler (SCH_)

    #include "sch.h"
    
    Void SCH_init(Int nuOfSchQuItems);
    Void SCH_reset();

    Void SCH_submit(func, arg)
    Int (*func)();
    Ptr arg;

    Void SCH_block();
    Void SCH_run();

In environments where multi processing is supported, it may be desirable to time share the CPU with other processes. In this scenario when the communication software has no more work to do it can block and deliver CPU to other processes.

SCH_ module can be used for rescheduling of known modules. One of the common usages of SCH_ module rescheduling of further processing with in the same module. This happens most often to prevent re-entry to non-re-entrant code.

Take the case of an (N-1) Action Primitive resulting into an (N-1) Event Primitive. If (N) layer code is non-re-entrant, this should not happen. The expected behavior of (N-1) module is:

• Detect that an Action Primitive is resulting into an Event Primitive.
• Store the information required for the future issuance of the Event Primitive.
• Request re-scheduling of this layer.
• Complete the Action Primitive, and return.

The following example illustrates an example of such a sequence.

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