1. make umtx sharable between processes, the way is two or more processes

   call mmap() to create a shared space, and then initialize umtx on it,
   after that, each thread in different processes can use the umtx same
   as threads in same process.
2. introduce a new syscall _umtx_op to support timed lock and condition
   variable semantics. also, orignal umtx_lock and umtx_unlock inline
   functions now are reimplemented by using _umtx_op, the _umtx_op can
   use arbitrary id not just a thread id.

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/kern/syscalls.c b/sys/kern/syscalls.c
index 3abb7f8c6083..e61b71e31a37 100644
--- a/sys/kern/syscalls.c
+++ b/sys/kern/syscalls.c
@@ -461,4 +461,5 @@ const char *syscallnames[] = {
 	"getaudit_addr",			/* 451 = getaudit_addr */
 	"setaudit_addr",			/* 452 = setaudit_addr */
 	"auditctl",			/* 453 = auditctl */
+	"_umtx_op",			/* 454 = _umtx_op */
 };