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SS7 Protocols ISUP Programmer's Manual Issue 15

4 Interface to System Services

4.1 System Functions

In addition to the primitive interfaces and the management interface to the

ISUP module (which are described in later sections) the module requires a

few basic system services to be supplied by the underlying operating system.

In most cases, this is achieved by the use of the appropriate Development

package.

The following functions are used for inter-task communication:

GCT_send Send a message to another task.

GCT_receive Receive the next message from the module’s input queue, blocking the task if

no message is ready.

GCT_grab As GCT_receive, but no blocking if no message is ready.

The following functions are required for message allocations for inter-task

communication:

getm Allocate a message from the system.

relm Release a message back to the system.

4.2 Timer Operation

In order to provide internal implementation of the ISUP protocol timers the

module needs to receive a periodic timer tick message. This is generated

either by the on-board timer module or the tick and tim binaries supplied as

part of the development package.

The following action request message is issued by the ISUP module:

KEEP_TIME Issued by ISUP to initialize timer services.

The ISUP module expects the following notification on a periodic basis from

the timer module:

TM_EXP Issued by the timer module to notify of periodic timer tick.

The format of these messages is described in Appendix F: Timer Services on

page 199

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Welltech Dialogic SS7 Protocols ISUP Manual de usuario Pagina 19