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WHAT SYNCHRONOUS/ASYNCHRONOUS CALL??

 
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dsbhati

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Joined: 13 Jun 2005
Posts: 10
Location: india

PostPosted: Fri Jun 24, 2005 11:42 am    Post subject: WHAT SYNCHRONOUS/ASYNCHRONOUS CALL??
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Hi all,

Could any tell me what is synchronous and asynchronous call???

Thanks & Regards,
Darshan
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mdtendulkar

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Joined: 29 Jul 2003
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Location: USA

PostPosted: Wed Jun 29, 2005 8:11 am    Post subject:
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darshan,

A detailed query would have resulted in answers

btw...a 2 min search in google, would have given you following results

http://www.google.com/search?biw=1004&hl=en&q=synchronous+call&btnG=Google+Search

Hope this helps,

Regards
Mayuresh
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dsbhati

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Joined: 13 Jun 2005
Posts: 10
Location: india

PostPosted: Fri Jul 01, 2005 11:11 am    Post subject: Thanks Mayuresh.
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Mayuresh,

Could u tell how can ipmlement these in cobol??

can we do or not?/


Regards,
Darshan
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mdtendulkar

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Joined: 29 Jul 2003
Posts: 238
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PostPosted: Fri Jul 01, 2005 4:24 pm    Post subject:
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darshan,

Synchronous Call:

There are two main ways in which one program can invoke other

1) EXEC CICS LINK
This allows one program to transfer control to another and continue execution after the called program has returned. This also occurs by means of native programming language such as COBOL CALL statement.

2) EXEC CICS XCTL
Allows for one program to call other in synchronous but unlike LINK will not receive control back when the called program returns.

In both the cases, COMMAREA is used to pass parameters and returned values


Asynchronous Call:

One program can call other by passing data in the FROM area defined in EXEC CICS START command. Programm for which START has been issued is executed as logical level 1, independent of the level of the program that issued START. FROM area can be accessed using RETRIEVE command

Also you can code CICS + MQSERIES program for asynchronous calls


Hope this helps

Regards,

Mayuresh
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