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Process Hanging

 
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Old 07-07-2010
Process Hanging
Hi! I have written a program three threads will be created to execute three different Sybase SQLs. so three thread will call a method runQuery.
In run query again we create child process to execute the actuall SQL by connecting to the SQL. When I run the process first three threading working fine. but third thread relate child process is hangin just after fork().

Can somebody let me know the why the child process hangs with lwp_park( truss). is there any clue from below information. Any deadlock? locks?

STRUSS INFO:
Code:
% truss -p 5586
/4: waitid(P_PID, 5590, 0xFEB7B760, WEXITED|WTRAPPED) (sleeping...)
/1: lwp_wait(4, 0xFFBFF7BC) (sleeping...)
% truss -p 5590
lwp_park(0x00000000, 0) (sleeping...)

Here is
parent pid:5586
child pid:5590
PSTACK INFO:
Code:
:pstack 5586
----------------- lwp# 1 / thread# 1 --------------------
ff046458 lwp_wait (4, ffbff7bc)
ff041e40 _thrp_join (4, 0, ffbff84c, 1, ffbff7bc, ff073700) + 34
00024b2c __1cUGenericDataExtractorLextractData6M_i_ (ffbff91c, ffbffab9, 0, 0, 0, 0) + 1dc
00029868 main (2, ffbff9b4, ffbff9c0, 72800, ff091340, 0) + 258
0001e818 _start (0, 0, 0, 0, 0, 0) + 108
----------------- lwp# 4 / thread# 4 --------------------
ff046750 waitid (0, 15d6, feb7b760, 3)
ff039030 waitpid (15d6, feb7b8dc, 0, 0, 48, b) + 60
00023674 __1cLSimpleQdDueryKexecuteSQdDL6MrnJQdDueryInfo__i_ (7ce58, feb7be4c, 7c684, 58640, 72, ff072f18) + 67c
00026b5c __1cOQdDueryProcessorRprocessConfigFile6M_i_ (8bc10, feb7c000, 0, 0, 290f8, 0) + b74
00025c20 __1cOQdDueryProcessorIrunQdDuery6M_i_ (8bc10, 0, 0, 137d4, ff0ea810, 7d470) + 30
00029148 runQuery (8bc10, feb7c000, 0, 0, 290f8, 0) + 50
ff045238 _lwp_start (0, 0, 0, 0, 0, 0)
 
:pstack 5590
ff0452d8 lwp_park (0, 0, 0)
ff03df18 mutex_lock_internal (7ba48, 0, 1, 10, ff06e2f4, 0) + 2cc
0003d6c8 __1cNstream_rmutexLrmutex_lock6M_v_ (73470, 73470, 0, 58640, 72, ff072f18) + 9c
0002ca38 __1cNstream_lockerHdo_lock6M_v_ (feb7b834, 5d795, 0, 0, ff073700, fee41200) + 48
0002c230 __1cNstream_lockerElock6M_v_ (feb7b834, 73470, 0, 58640, 72, ff072f18) + 30
0002b2c8 __1cHostream2l6Mpkc_r0_ (73424, 5d795, 0, 0, ff073700, fee41200) + b8
000232b0 __1cLSimpleQdDueryKexecuteSQdDL6MrnJQdDueryInfo__i_ (7ce58, feb7be4c, 7c684, 58640, 72, ff072f18) + 2b8
00026b5c __1cOQdDueryProcessorRprocessConfigFile6M_i_ (8bc10, feb7c000, 0, 0, 290f8, 0) + b74
00025c20 __1cOQdDueryProcessorIrunQdDuery6M_i_ (8bc10, 0, 0, 137d4, ff0ea810, 7d470) + 30
00029148 runQuery (8bc10, feb7c000, 0, 0, 290f8, 0) + 50
ff045238 _lwp_start (0, 0, 0, 0, 0, 0)

Last edited by pludi; 07-07-2010 at 09:13 AM.. Reason: code tags, please...
 
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