1 files changed, 89 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/lib/libspl/mutex.c b/sys/contrib/openzfs/lib/libspl/mutex.c
new file mode 100644
index 000000000000..36e5bec396ed
--- /dev/null
+++ b/sys/contrib/openzfs/lib/libspl/mutex.c
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: CDDL-1.0
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or https://opensource.org/licenses/CDDL-1.0.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
+ * Copyright (c) 2016 Actifio, Inc. All rights reserved.
+ * Copyright (c) 2025, Klara, Inc.
+ */
+
+#include <assert.h>
+#include <pthread.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/mutex.h>
+
+/*
+ * =========================================================================
+ * mutexes
+ * =========================================================================
+ */
+
+void
+mutex_init(kmutex_t *mp, char *name, int type, void *cookie)
+{
+	(void) name, (void) type, (void) cookie;
+	VERIFY0(pthread_mutex_init(&mp->m_lock, NULL));
+	memset(&mp->m_owner, 0, sizeof (pthread_t));
+}
+
+void
+mutex_destroy(kmutex_t *mp)
+{
+	VERIFY0(pthread_mutex_destroy(&mp->m_lock));
+}
+
+void
+mutex_enter(kmutex_t *mp)
+{
+	VERIFY0(pthread_mutex_lock(&mp->m_lock));
+	mp->m_owner = pthread_self();
+}
+
+int
+mutex_enter_check_return(kmutex_t *mp)
+{
+	int error = pthread_mutex_lock(&mp->m_lock);
+	if (error == 0)
+		mp->m_owner = pthread_self();
+	return (error);
+}
+
+int
+mutex_tryenter(kmutex_t *mp)
+{
+	int error = pthread_mutex_trylock(&mp->m_lock);
+	if (error == 0) {
+		mp->m_owner = pthread_self();
+		return (1);
+	} else {
+		VERIFY3S(error, ==, EBUSY);
+		return (0);
+	}
+}
+
+void
+mutex_exit(kmutex_t *mp)
+{
+	memset(&mp->m_owner, 0, sizeof (pthread_t));
+	VERIFY0(pthread_mutex_unlock(&mp->m_lock));
+}