INtime® 3.1 Software - tenAsys

INtime 3.1 Software
System call types
Several types of calls exist, and each kernel exchange object has calls of one or more
type associated with it:
• Windows eXtension (NTX) calls: Windows uses these calls to communicate with
the INtime kernel. NTX calls allow Windows applications to operate on objects
created by, stored in, and controlled by the RT kernel.
• Real-time (RT) calls: The RT kernel uses these calls to run the RT portion of
INtime applications and communicate with Windows. INtime software provides
two levels of system calls for RT kernel exchange objects:
• High-level (validating) calls: Write, test, and debug your application using
high-level calls with their protection and validation features.
• Low-level (non-validating) calls: Use low-level calls where there is no other
choice, such as with AlarmEvents and where a semaphore or a mailbox must
be used with an interrupt handler.
• RT services: INtime real-time applications (RTAs) which process messages from a
user and events from an interface, and the service handlers required to perform
service-dependent functions of the system calls.
RT kernel objects provide these RT call levels:
Object NTX High-level Low-level
Distributed System Management (DSM) X X
Exception handling
X
Interrupts
X
Mailboxes X X X
Memory management X X
Object directories X X
Ports X X
Processes X X
Regions
X
Scheduler
X
Semaphores X X X
Status X X
System data
X
TCP/IP calls
Threads
X
Time management
X
RT service handlers
X
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