Module Name:src
Committed By: thorpej
Date: Tue Nov 3 16:05:51 UTC 2020
Modified Files:
src/sys/sys [thorpej-futex]: futex.h
Log Message:
Add definitions for FUTEX_NETBSD_RW_WAIT and FUTEX_NETBSD_RW_HANDOFF.
(Forgot to commit this file previously.)
To generate a diff of this commit:
cvs rdiff -u -r1.4 -r1.4.2.1 src/sys/sys/futex.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/sys/futex.h
diff -u src/sys/sys/futex.h:1.4 src/sys/sys/futex.h:1.4.2.1
--- src/sys/sys/futex.h:1.4 Tue May 5 15:25:18 2020
+++ src/sys/sys/futex.h Tue Nov 3 16:05:51 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: futex.h,v 1.4 2020/05/05 15:25:18 riastradh Exp $ */
+/* $NetBSD: futex.h,v 1.4.2.1 2020/11/03 16:05:51 thorpej Exp $ */
/*-
* Copyright (c) 2018, 2019 The NetBSD Foundation, Inc.
@@ -86,6 +86,10 @@
#define FUTEX_WAIT_REQUEUE_PI 11
#define FUTEX_CMP_REQUEUE_PI 12
+/* These futex operations are NetBSD extensions. */
+#define FUTEX_NETBSD_RW_WAIT 64
+#define FUTEX_NETBSD_RW_HANDOFF 65
+
#define FUTEX_PRIVATE_FLAG __BIT(7)
#define FUTEX_CLOCK_REALTIME __BIT(8)
@@ -133,6 +137,18 @@
#define FUTEX_BITSET_MATCH_ANY ((int)__BITS(0,31))
/*
+ * The FUTEX_NETBSD_RW_WAIT and FUTEX_NETBSD_RW_HANDOFF operations
+ * define specific meanings for some of the futex word bits and val3.
+ *
+ * (futex & FUTEX_TID_MASK) is the owner in the write-locked case,
+ * and the count of readers in the read-locked case.
+ */
+#define FUTEX_RW_WRITE_LOCKED FUTEX_SYNCOBJ_1
+#define FUTEX_RW_WRITE_WANTED FUTEX_SYNCOBJ_0
+#define FUTEX_RW_READER 0
+#define FUTEX_RW_WRITER 1
+
+/*
* The robust futex ABI consists of an array of 3 longwords, the address
* of which is registered with the kernel on a per-thread basis:
*
