Messages in this thread | | | Date | Tue, 27 Apr 1999 19:14:28 -0400 | From | Manoj Kasichainula <> | Subject | Bug with fcntl locks, pthread mutexes, and threads? |
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I think I'm running into a very complicated threading bug.
To reproduce it, I use the attached C program. The program forks off two child processes, each with two threads. Each thread tries to grab a two-layer lock, with a pthread lock followed by an fcntl lock. The thread then sleeps for a long time. So, once we have a thread that has gotten through both locks, we have:
process 1: thread 1: holds pthread lock, holds fcntl lock, sleeping thread 2: waiting on pthread lock process 2: thread 1: holds pthread lock, waiting on fcntl lock thread 2: waiting on pthread lock
Then I kill -TERM process 1. All of its threads go away, but process 2, thread 1 never wakes up out of fcntl(). lsof claims that none of the remaining processes/threads hold the lock.
This sounds like a bug.
-- Manoj Kasichainula - manojk@raleigh.ibm.com IBM, Apache Development
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