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Groups > comp.lang.c++ > #10688 > unrolled thread
| Started by | Jaydeep Chovatia <chovatia.jaydeep@gmail.com> |
|---|---|
| First post | 2011-10-05 14:09 -0700 |
| Last post | 2011-10-06 20:42 +1300 |
| Articles | 3 — 3 participants |
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pthread rwlock deadlock detection Jaydeep Chovatia <chovatia.jaydeep@gmail.com> - 2011-10-05 14:09 -0700
Re: pthread rwlock deadlock detection gwowen <gwowen@gmail.com> - 2011-10-06 00:39 -0700
Re: pthread rwlock deadlock detection Ian Collins <ian-news@hotmail.com> - 2011-10-06 20:42 +1300
| From | Jaydeep Chovatia <chovatia.jaydeep@gmail.com> |
|---|---|
| Date | 2011-10-05 14:09 -0700 |
| Subject | pthread rwlock deadlock detection |
| Message-ID | <653ffd73-06b2-4df1-8a7e-367a3afdcbc3@n15g2000vbn.googlegroups.com> |
Hi, I have multi-threaded program (C++, Linux) in which I am using pthread_rwlock_t to read/write lock the critical section. Under load my program hangs in acquiring read lock. It seems like some writer has not released the lock. I have doubled check my source code but no success. Is there any way to see thread ownership on mutex to get idea about who is current owner? Is there any otherway to debug it? Note: I am using PTHREAD_MUTEX_ERRORCHECK type of thread and checking the return status while locking/unlocking. No error found during locking/unlocking. Thank you, Jaydeep
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| From | gwowen <gwowen@gmail.com> |
|---|---|
| Date | 2011-10-06 00:39 -0700 |
| Message-ID | <e911bfab-72d1-4caa-ae42-0026e64379d0@q25g2000vbx.googlegroups.com> |
| In reply to | #10688 |
On Oct 5, 10:09 pm, Jaydeep Chovatia <chovatia.jayd...@gmail.com> wrote: > Is there any way to see thread ownership on mutex to get idea about > who is current owner? Is there any otherway to debug it? I've had some success with the valgrind --tool=helgrind, but its not a panacea
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| From | Ian Collins <ian-news@hotmail.com> |
|---|---|
| Date | 2011-10-06 20:42 +1300 |
| Message-ID | <9f54evFtu8U3@mid.individual.net> |
| In reply to | #10688 |
On 10/ 6/11 10:09 AM, Jaydeep Chovatia wrote: > Hi, > > I have multi-threaded program (C++, Linux) in which I am using > pthread_rwlock_t to read/write lock the critical section. Under load > my program hangs in acquiring read lock. It seems like some writer has > not released the lock. I have doubled check my source code but no > success. > Is there any way to see thread ownership on mutex to get idea about > who is current owner? Is there any otherway to debug it? The easiest way is to wrap the mutex and instrument it (keep the owner tid in the wrapper object) for debugging. -- Ian Collins
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