posix/aos delta document background • background: jsf, os-jtf, disa (ajpo), and usaf wright lab...

Curtis Royster, Jr.Curtis Royster, Jr.DISA, Center for StandardsDISA, Center for Standards

([email protected])([email protected])

Minerva RodriguezMinerva RodriguezRaytheon Systems CompanyRaytheon Systems Company

([email protected])([email protected])

POSIX/AOS Delta DocumentOpen Systems Project Engineering Conference (OSPEC)

FY 98 Status Review29 April - 1 May 1998

REPORT DOCUMENTATION PAGE Form Approved OMB No.0704-0188

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1. REPORT DATE (DD-MM-YYYY)29-04-1998

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4. TITLE AND SUBTITLEPOSIX/AOS Delta DocumentUnclassified

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6. AUTHOR(S)Royster, Jr., curtis ;Rodriguez, Minerva ;

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9. SPONSORING/MONITORING AGENCY NAME AND ADDRESSOpen Systems Joint Task Force (OSJTF)1931 Jefferson Davis HighwayCrystal Mall 3, Suite 104Arlington, VA22202

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19. NAME OF RESPONSIBLE PERSONhttp://www.acq.osd.mil/osjtf/library/library_alpha.html,(blank)[email protected]

a. REPORTUnclassified

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Standard Form 298 (Rev. 8-98)Prescribed by ANSI Std Z39.18

2

Background

• Background: JSF, OS-JTF, DISA (AJPO), andUSAF Wright Lab funded Hughes to evaluate anddetermine the suitability of the POSIX and AOSAPIs, and Ada 95 features for real-time embeddedsoftware

– Areas of Interest: availability, performance, security, andsupportability tradeoffs

– Provide a Delta Document comparing POSIX, AOS andAda 95 (1996 - 1997)

– Received Funding to pursue implementation of the DeltaDocument Findings (1998 )

• The Delta Document provides information neededto decide if POSIX is feasible in real-time militaryavionics?

3

The Delta Document Flow

Delta Document:•Req’t Desc.•API Evaluation•Comparison Matrix

•POSIX•Ada-95•AOS

API

POSIX W/G

OtherStudies

RTOS

SAERequirements

AdaBindings

DistributedCommunications

Standard

Updated Profiles

Revised Real-TimeStandard

Real-TimeAvionicsStandard

4

SAE-AS5 OS API WGRequirements

File Management Data Conversion Built-In TestBootup/Initialization/

ShutdownMemory ManagementProgram Support

CommunicationTask Control InstrumentationInput / Output Configuration Reinitialization

Fault ManagementData Security Timer ServicesSynchronization Non-Operational SupportSpecial Devices

5

API Comparison

FunctionalityFunctionality-

•17 Functional Areas•Based on fulfilling 75% of The Requirements in a Functional Area

RequirementsRequirements-

•277 Total Requirements•17 Functional Areas•Failed, Unknown, and Not Applicable Req’s not Counted As Fulfilled

P O S IX AOS A d a - 9 50

2

4

6

8

1 0

1 2

1 4

1 6

P O S IX AOS A d a - 9 5

A P I F u n c tio n a lity

P O S IX A O S A d a - 9 50 %

2 0 %

4 0 %

6 0 %

8 0 %

1 0 0 %

P O S IX A O S A d a - 9 5

R e q u ire m e n ts

6

Category 1: POSIX Meets TheRequirements

RequirementsRequirements:

•Synchronization•Task Control•Timer Services•File Management

Number of RequirementsNumber of Requirements:•60 Total Requirements

FindingsFindings:

POSIX: Minor Modifications needed to:•Synchronization•Task control•Timer Services•File Management

RecommendationsRecommendations:

•Present List of Minor Changes to POSIXReal-Time Working Group.Example: Semaphores as NotificationMechanism.

• Write PAR. Implement Changes into Real-Time Standard.

•Evaluate the Four POSIX Military ProfilesFor Avionics Feasibility.

POSIX A O S A d a - 9 50 %

2 0 %

4 0 %

6 0 %

8 0 %

1 0 0 %

POSIX A O S A d a - 9 5

P O S I X M e e ts R e q u i r e m e n ts

7

Category 2: POSIX NearlyMeets Requirements

RequirementsRequirements:

•Communication


FindingsFindings:

•The POSIX Capability for themajority of Communication wasUnknown at the Time of TheEvaluation.

•NOTE: Need to review the POSIXDistributed CommunicationStandard

RecommendationsRecommendations:

•Compare Distributed Comm withDelta Document requirements

–Recommend The Implementation ofAda Bindings of Any RelevantRequirements.

POSIX AOS Ada-950%

20%

40%

60%

80%

100%

POSIX AOS Ada-95

POSIX Nearly Meets Requirements

8

Category 3: POSIX ShouldAddress

RequirementsRequirements:> Program Support > Data Security> Memory Mgmt > Input Output> Data Conversion > Fault Mgmt>Non-Operational Support


FindingsFindings:

•Significant Deficiencies Found in:•Program Support•Data Security•Memory Management•Input Output•Data Conversion•Fault Management•Non-Operational Support

RecommendationRecommendation:

•Present The Missing Requirements toThe Real-Time Working Group.

•Get a Consensus on The NeededRequirements & Implement

•Migrate Any Requirements That havenot Been Agreed-on to Category 4.

P O S IX A O S A d a - 9 50 %

2 0 %

4 0 %

6 0 %

8 0 %

1 0 0 %


P O S IX S h o u l d A d d r e s s

9

Category 4: POSIX Should NotAddress

RequirementsRequirements:•Special Devices > Configuration•Built-In Test > Instrumentation•Bootup / Initialization / Shutdown•Reinitialization


FindingsFindings:

•Significant Deficiencies Found in:•Special Devices•Configuration•Built-In Test•Instrumentation•Bootup / Initialization / Shutdown•Reinitialization

RecommendationRecommendation:

•Present The Missing Requirements toThe Real-Time Working Group.

•Get a Consensus on TheRequirements.

•Ask JSF OSA to Define an API forAvionics Specific Requirements.

P O S IX A O S A d a - 9 50 %

2 0 %

4 0 %

6 0 %

8 0 %

1 0 0 %


P O S I X S h o u l d N o t A d d r e s s

10

Ada’s Real Time Capabilities

(F-14)

(F-15)

(F-18)

Others (B-2)

(JSF)

Ada 83Ada 83

•Tasking•Exceptions

(F-22)

(Commanche)

Ada 95Ada 95

•Semaphores•Real-Time Services

OS Ada0%

20%40%60%80%

100%

OS Ada

Pre-Ada

OS Ada0%

20%40%60%80%

100%

OS Ada

Ada-83

OS Ada0%

20%40%60%80%

100%

OS Ada

Ada-95

11

The Trend in ApplicationProgramming I/Fs (API)

Ada + POSIXAda + POSIX•Real-Time Functionality Lacking in OS, POSIX, and Ada•Considerable Overlap in OS, POSIX, and Ada

Ada + POSIXAda + POSIX•High Order Functionality in Ada•General OS Functionality in POSIX•Hardware Specific Functionality in RTOS

POSIX RTOS HOL0%

20%

40%

60%

80%

100%

POSIX RTOS HOL

Past

POSIX RTOS Ada-950%

20%

40%

60%

80%

100%

POSIX RTOS Ada-95

Present

POSIX RTOS Ada-950%

20%

40%

60%

80%

100%

POSIX RTOS Ada-95

Future

12

FY98 Planned Tasks

• Task 1: Support The OSJTF Test Suite IndustryWide Certification Program.

» Beta Test

» Conformance Statement Questionnaire

• Task 2: Support POSIX Real-Time Standard.» Bring Delta Doc findings to RT System Services WG

» Write PARs and participate in WG

• Task 3: Update the Delta Document and provide toJSF.

» Update Delta Doc to include RT Distributed Communication

» Provide to JSF for DII/COE RT consideration

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