From: Willy Tarreau > Sent: 06 October 2020 17:11 > > On Tue, Oct 06, 2020 at 08:50:52AM -0700, Paul E. McKenney wrote: > > Comparing 25+ assembly languages to but two compilers most definitely > > motivates looking hard at doing something with the compilers. > > +1, especially since the kernel is not special; anyone working with > threads faces the same issues in userland, which are often hidden > behind the implicit whole-memory clobbers of certain operations or > the call to mutex manipulation functions, but which become a reality > again as soon as you go slightly away from these and try to use > lockless mechanisms.
AFAICT most windows and android apps completely ignore the problem of thread locking - which is why the crash and lock up all the time :-) I've spent most of the day looking at some library traces from a customer bug. I almost suspect a bug in the pthread mutex code on their system. They are using a nice, modern, 3.10.0-957.el7.x86_64 kernel. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)