zlog_fini multi thread dead lock

[ligzy]

HI,
Thank your library first.It's very good log library.
I am use for my work.
I use it in a multi thread program.
I found a question that when in function will not exit.

In my main thread ,when i got a signal such as SEGEV then call clean up function. In clean function it will cal zlog_fini(void).
but some time it will hung there and not exit,then the program will not exit.
I use debug message found that 👍 in zlog_fini(void)
rc = pthread_rwlock_wrlock(&zlog_env_lock);
is waiting and not return.because of another thread got the lock somewhere.
if when cleanup i call zlog_fini(void) in that thread it will success and every thing is ok.

So i guess here is a multi thread bug in multi thread call zlog_fini(void).

special thanks for your the good library.

Thanks!

Jeremy Li

[HardySimpson]

That would happen.
I think when your main thread receive SEGSEV and call zlog_fini in signal handle function,
another working thread is still in log fuction, which get the read lock.

As zlog_fini() should get the write lock, and wait for all the read lock release.
I don't know how to correctly solve this kind of problem in any multi-thread program.

In this case, I think the useful way is not call zlog_fini() in signal handle function.