process waiting for a semaphore

Allexandra05 · 03-05-2015, 07:37 AM

If I have a process that is in sleep state and i can see in ps' column WCHAN that is waiting to obtain a semaphore, is there any way to find the adress of that semaphore?

rtmistler · 03-05-2015, 08:02 AM

No not unless you're within that code's execution path and know the symbol name.

Valery Reznic · 03-06-2015, 12:38 AM

Quote:

Originally Posted by Allexandra05

If I have a process that is in sleep state and i can see in ps' column WCHAN that is waiting to obtain a semaphore, is there any way to find the adress of that semaphore?

Code:

sudo strace -p <your_process_pid>

will gave you some info, but what will you do with this semaphore address?

Allexandra05 · 03-06-2015, 06:32 AM

Quote:

Originally Posted by Valery Reznic

Code:

sudo strace -p <your_process_pid>

will gave you some info, but what will you do with this semaphore address?

I need a tools for linux that will provide the same information as QNX's pidin, more about the state and blocked columns: http://www.qnx.com/developers/docs/6...n.html#Blocked.

In pidin's output, when the state is SEM(semaphore-blocked) in the blocked column will be the adress of the semaphore.
I want, if it's possible, to somehow combine this information with ps.