Linux 2.4 is dead. (The libthread code hasn't worked for Linux 2.4 for a long time.)

Linux.c was for Linux 2.4 and is no longer used directly, only indirectly because NetBSD.c was a 1-line file #including Linux.c. So mv Linux.c NetBSD.c. Also rm Linux-*-asm.s which was for Linux 2.4 as well.

More dead code.

Darwin 11.0.0 was Mac OS X 10.7.0 aka Lion. The previous version was Snow Leopard, which has been unsupported by Apple since February 2014.

Pretty sure FreeBSD 4 is gone now. :-)

This should have been deleted in 20f5692b (2012-07-14), which removed the mkfile and sysofiles.sh references to it.

They were just a duplicate of my(get|set)mcontext from the other assembly file, and unused from threadimpl.h. Change-Id: Id8003e5177ed9d37a7f0210037acbe55bbf7f708

Fixes #195. Signed-off-by: Dan Cross <cross@gajendra.net>

Fixes #3.

Signed-off-by: Dan Cross <cross@gajendra.net>

The issue manifests in fork: POSIX fork mandates that a fork'd process is created with a single thread. If a multithreaded program forks, and some thread was in malloc() when the fork() happened, then in the child the lock will be held but there will be no thread to release it. We assume the system malloc() must already know how to deal with this and is thread-safe, but it won't know about our custom spinlock. Judging that this is no longer necessary (the lock code was added 15 years ago) we remove it. Signed-off-by: Dan Cross <cross@gajendra.net>

POSIX setenv does everything that p9putenv's body, so just delegate to that. Signed-off-by: Dan Cross <cross@gajendra.net>

Fixes #347.

The ptrace handlers wanted to take u64int arguments, not ulong. Signed-off-by: Dan Cross <cross@gajendra.net>