Comment 7 for bug 57731

Hi Rogers,
Thanks for your interesting C-code!
Occasionally I am experiencing the same problem.
The program freezes due to a FUTEX_WAIT call (detected by the use of strace), directly after the arrival of SIGCHLD.
After reading some documents on futexes I believe to know, that the reason for the deadlock is a missing FUTEX_WAKE call by the kernel to wake up the suspended processes/threads again.
In your program your are writing a zero to the futex value.
Why is this working? Did you refer to a specific document?

Cheers,
Wayne