On 8/20/20 2:58 PM, mw wrote: > Hi, > > I run into an issue: it's SIGUSR1 in clock_nanosleep() The GC uses SIGUSR1 (and SIGUSR2). Maybe that's the issue? https://github.com/dlang/druntime/blob/e1fb19829ebef0419782de43ce4b0e2a1ba140be/src/core/thread/osthread.d#L1946 -Steve