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Full Discussion: Multithreading in Pro*C
Top Forums Programming Multithreading in Pro*C Post 6635 by shaik786 on Sunday 9th of September 2001 04:17:12 AM
Old 09-09-2001
Question Multithreading in Pro*C

Smilie

Hi!

I have created a Multhreaded Application in Pro*C (using pthreads) with about 5 Threads running simultaneously. The Application is basically to Update a Centralized Table in Oracle, which updates different rows in the Table (Each Thread updates different rows!). The problem is that it gets compiled and when I execute, I get an error.

This happens like this ...

void *thread_1(void *nothing)
{
EXEC SQL BEGIN DECLARE SECTION;
.
.
.
EXEC SQL END DECLARE SECTION;

EXEC SQL CONTEXT USE :ctx0;
EXEC SQL WHENEVER SQLERROR DO sql_error();
printf(" In Here\n");
EXEC SQL CONNECT : uid IDENTIFIED BY : pwd;
printf(" Out Here\n");


.
.
.
}


The "In Here" is displayed on the Screen, but "Out Here" message is never shown on screen, but instead, I get the message:


In Here
Stack overflow: pid 17041, proc UPDATE, addr 0x140065ff0, pc 0x1200b961c
Memory fault(coredump)


The UID/PWD is right. But when I reduse some "EXEC SQL ..." statements from the function, the program works perfecty fine!

Could someone tell me what exactly is the error and how can it be avoided.

Thanks and Regards
SHAIK

Last edited by shaik786; 09-09-2001 at 08:25 AM..
shaik786
 

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ROLLBACK(7)                                                        SQL Commands                                                        ROLLBACK(7)

NAME
ROLLBACK - abort the current transaction SYNOPSIS
ROLLBACK [ WORK | TRANSACTION ] DESCRIPTION
ROLLBACK rolls back the current transaction and causes all the updates made by the transaction to be discarded. PARAMETERS
WORK TRANSACTION Optional key words. They have no effect. NOTES
Use COMMIT [commit(7)] to successfully terminate a transaction. Issuing ROLLBACK when not inside a transaction does no harm, but it will provoke a warning message. EXAMPLES
To abort all changes: ROLLBACK; COMPATIBILITY
The SQL standard only specifies the two forms ROLLBACK and ROLLBACK WORK. Otherwise, this command is fully conforming. SEE ALSO
BEGIN [begin(7)], COMMIT [commit(7)], ROLLBACK TO SAVEPOINT [rollback_to_savepoint(7)] SQL - Language Statements 2010-05-14 ROLLBACK(7)
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