From 0231b68a8b0ef60d905d4fc7acdf7bc3e20e6cc1 Mon Sep 17 00:00:00 2001
From: Samy Al Bahra <sbahra@appnexus.com>
Date: Fri, 11 Nov 2011 21:54:38 +0000
Subject: [PATCH] ck_spinlock: Add ck_spinlock_*_locked.

This class of functions detects whether or not the
lock is currently acquired.
---
 include/ck_spinlock.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/include/ck_spinlock.h b/include/ck_spinlock.h
index 3955068..d1cc03c 100644
--- a/include/ck_spinlock.h
+++ b/include/ck_spinlock.h
@@ -177,6 +177,13 @@ ck_spinlock_fas_trylock(struct ck_spinlock_fas *lock)
 	return (!value);
 }
 
+CK_CC_INLINE static bool
+ck_spinlock_fas_locked(struct ck_spinlock_fas *lock)
+{
+
+	return ck_pr_load_uint(&lock->value);
+}
+
 CK_CC_INLINE static void
 ck_spinlock_fas_lock(struct ck_spinlock_fas *lock)
 {
@@ -239,6 +246,13 @@ ck_spinlock_cas_trylock(struct ck_spinlock_cas *lock)
 	return (!value);
 }
 
+CK_CC_INLINE static bool
+ck_spinlock_cas_locked(struct ck_spinlock_cas *lock)
+{
+
+	return ck_pr_load_uint(&lock->value);
+}
+
 CK_CC_INLINE static void
 ck_spinlock_cas_lock(struct ck_spinlock_cas *lock)
 {
@@ -297,6 +311,13 @@ ck_spinlock_dec_trylock(struct ck_spinlock_dec *lock)
 	return (value == 1);
 }
 
+CK_CC_INLINE static bool
+ck_spinlock_dec_locked(struct ck_spinlock_dec *lock)
+{
+
+	return ck_pr_load_uint(&lock->value) != 1;
+}
+
 CK_CC_INLINE static void
 ck_spinlock_dec_lock(struct ck_spinlock_dec *lock)
 {
@@ -470,6 +491,13 @@ ck_spinlock_mcs_trylock(struct ck_spinlock_mcs **queue, struct ck_spinlock_mcs *
 	return ck_pr_cas_ptr(queue, NULL, node);
 }
 
+CK_CC_INLINE static bool
+ck_spinlock_mcs_locked(struct ck_spinlock_mcs **queue)
+{
+
+	return ck_pr_load_ptr(queue) != NULL;
+}
+
 CK_CC_INLINE static void
 ck_spinlock_mcs_lock(struct ck_spinlock_mcs **queue, struct ck_spinlock_mcs *node)
 {