Both the main thread (1) and the worker thread (3) are in "nanosleep()". (The
rest are in `pthread_cond_wait()`.)
(gdb) bt
#0 0x00007f172734be4d in nanosleep () from /lib64/libpthread.so.0
#1 0x000000000044655b in nossleep (milsecs=milsecs@entry=100) at
/mnt/software/n/nim/0.20.2/Nim/lib/pure/os.nim:2791
#2 0x000000000046f4f2 in sync_WTnSSeVs19cfp5pRs6KBLXQ_2 ()
at
/mnt/software/n/nim/0.20.2/Nim/lib/pure/concurrency/threadpool.nim:596
(gdb) thread 3
[Switching to thread 3 (Thread 0x7f17231cd700 (LWP 32423))]
(gdb) bt
#0 0x00007f172734be4d in nanosleep () from /lib64/libpthread.so.0
#1 0x000000000044655b in nossleep (milsecs=milsecs@entry=100) at
/mnt/software/n/nim/0.20.2/Nim/lib/pure/os.nim:2791
#2 0x000000000046dead in slave_1yqYR9cLeffanOjn0piJ2VQ (w=<optimized out>)
at
/mnt/software/n/nim/0.20.2/Nim/lib/pure/concurrency/threadpool.nim:346
#3 0x0000000000413144 in threadProcWrapDispatch_4bfnMli3YetX01hUbaU1ig_2 (
thrd=0x79c040 <workers_bezHuru9a1bEti2XBmfodvA+704>) at
/mnt/software/n/nim/0.20.2/Nim/lib/system/threads.nim:141
#4 0x000000000041360a in threadProcWrapStackFrame_4bfnMli3YetX01hUbaU1ig (
thrd=thrd@entry=0x79c040 <workers_bezHuru9a1bEti2XBmfodvA+704>)
at /mnt/software/n/nim/0.20.2/Nim/lib/system/threads.nim:156
#5 0x000000000041364d in threadProcWrapper_oTnP9cUoE9cVTUL7iHAoIIAA
(closure=0x79c040 <workers_bezHuru9a1bEti2XBmfodvA+704>)
at /mnt/software/n/nim/0.20.2/Nim/lib/system/threads.nim:165
#6 0x00007f1727344e25 in start_thread () from /lib64/libpthread.so.0
#7 0x00007f172707234d in clone () from /lib64/libc.so.6
Run
338 proc slave(w: ptr Worker) {.thread.} =
339 isSlave = true
340 while true:
341 if w.shutdown:
342 w.shutdown = false
343 atomicDec currentPoolSize
344 while true:
345 if w.data != nil: # <--
346 sleep(threadpoolWaitMs)
Run
That was added recently, in
[https://github.com/nim-lang/Nim/issues/11275](https://github.com/nim-lang/Nim/issues/11275),
to fix a threadpool seg-fault.
