Dmitry Chagin 79262bf1f0 Reimplement futexes. ... Old implemention used Giant to protect the kernel data structures, but at the same time called malloc(M_WAITOK), that could cause the calling thread to sleep and lost Giant protection. User-visible result was the missed wakeup. New implementation uses one sx lock per futex. The sx protects the futex structures and allows to sleep while copyin or copyout are performed. Unlike linux, we return EINVAL when FUTEX_CMP_REQUEUE operation is requested and either caller specified futexes are equial or second futex already exists. This is acceptable since the situation can only occur from the application error, and glibc falls back to old FUTEX_WAKE operation when FUTEX_CMP_REQUEUE returns an error. Approved by: kib (mentor) MFC after: 1 month		2009-05-01 15:36:02 +00:00
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linux.h	Revert 190445 change to this file restoring:	2009-03-27 17:00:49 +00:00
linux32_dummy.c	Implement robust futexes. Most of the code is modelled after	2008-05-13 20:01:27 +00:00
linux32_genassym.c	Segment registers are stored in the uc_mcontext member of the struct	2008-09-07 16:39:21 +00:00
linux32_ipc64.h
linux32_locore.s	Save and restore segment registers on amd64 when entering and leaving	2009-04-01 13:09:26 +00:00
linux32_machdep.c	Save and restore segment registers on amd64 when entering and leaving	2009-04-01 13:09:26 +00:00
linux32_proto.h	Regenerate	2008-11-29 14:57:58 +00:00
linux32_support.s	Move futex support code from <arch>/support.s into linux compat directory.	2007-05-23 08:33:06 +00:00
linux32_syscall.h	Regenerate	2008-11-29 14:57:58 +00:00
linux32_sysent.c	Regenerate	2008-11-29 14:57:58 +00:00
linux32_sysvec.c	Reimplement futexes.	2009-05-01 15:36:02 +00:00
Makefile
syscalls.conf	- Remove unused sysvec variables from various syscalls.conf.	2006-08-15 17:25:55 +00:00
syscalls.master	Fix iovec32 for linux32/amd64.	2008-11-29 14:55:24 +00:00