On Tue, Oct 26, 2021 at 11:29 PM Thomas Munro <thomas.mu...@gmail.com> wrote: > When I do mmap(MAP_ANONYMOUS | MAP_SHARED) and then fork(), it seems > that futex(2) wakeups are not delivered between child and parent in > that memory. It does work as expected if I instead use > shmget(IPC_PRIVATE).
Hello, This seems to be because such memory objects have no uvm_obj, which is needed by futex_get() to identify futexes. Could they have one? Or perhaps there is some other way to make a futex key in this case?
