From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 22 Jun 2016 20:20:25 +0000 (-0400)
Subject: Fix: add missing destroy functions to queues/stack APIs
X-Git-Tag: v0.9.3~10
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=026aaf45e156cae3b0d97df55bc1a04ef77c538e;p=userspace-rcu.git

Fix: add missing destroy functions to queues/stack APIs

Queues and stack APIs that invoke pthread_mutex_init() should have a
"destroy" counterpart which calls pthread_mutex_destroy(), ortherwise
this causes small memory leaks on platforms where pthread_mutex_init
performs memory allocation.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/lfstack.c b/lfstack.c
index 3dac178..c974a47 100644
--- a/lfstack.c
+++ b/lfstack.c
@@ -40,6 +40,11 @@ void cds_lfs_init(struct cds_lfs_stack *s)
 	_cds_lfs_init(s);
 }
 
+void cds_lfs_destroy(struct cds_lfs_stack *s)
+{
+	_cds_lfs_destroy(s);
+}
+
 void __cds_lfs_init(struct __cds_lfs_stack *s)
 {
 	___cds_lfs_init(s);
diff --git a/urcu/lfstack.h b/urcu/lfstack.h
index 11a63d9..5a9bca3 100644
--- a/urcu/lfstack.h
+++ b/urcu/lfstack.h
@@ -95,6 +95,7 @@ typedef union {
 
 #define cds_lfs_node_init		_cds_lfs_node_init
 #define cds_lfs_init			_cds_lfs_init
+#define cds_lfs_destroy			_cds_lfs_destroy
 #define __cds_lfs_init			___cds_lfs_init
 #define cds_lfs_empty			_cds_lfs_empty
 #define cds_lfs_push			_cds_lfs_push
@@ -119,12 +120,20 @@ typedef union {
 extern void cds_lfs_node_init(struct cds_lfs_node *node);
 
 /*
- * cds_lfs_init: initialize lock-free stack.
+ * cds_lfs_init: initialize lock-free stack (with locking). Pair with
+ * cds_lfs_destroy().
  */
 extern void cds_lfs_init(struct cds_lfs_stack *s);
 
 /*
- * __cds_lfs_init: initialize lock-free stack.
+ * cds_lfs_destroy: destroy lock-free stack (with lock). Pair with
+ * cds_lfs_init().
+ */
+extern void cds_lfs_destroy(struct cds_lfs_stack *s);
+
+/*
+ * __cds_lfs_init: initialize lock-free stack (without lock).
+ * Don't pair with any destroy function.
  */
 extern void __cds_lfs_init(struct __cds_lfs_stack *s);
 
diff --git a/urcu/static/lfstack.h b/urcu/static/lfstack.h
index 7afe71e..05d0bb4 100644
--- a/urcu/static/lfstack.h
+++ b/urcu/static/lfstack.h
@@ -66,7 +66,8 @@ void _cds_lfs_node_init(struct cds_lfs_node *node)
 }
 
 /*
- * cds_lfs_init: initialize lock-free stack.
+ * cds_lfs_init: initialize lock-free stack (with lock). Pair with
+ * cds_lfs_destroy().
  */
 static inline
 void _cds_lfs_init(struct cds_lfs_stack *s)
@@ -79,7 +80,19 @@ void _cds_lfs_init(struct cds_lfs_stack *s)
 }
 
 /*
- * ___cds_lfs_init: initialize lock-free stack.
+ * cds_lfs_destroy: destroy lock-free stack (with lock). Pair with
+ * cds_lfs_init().
+ */
+static inline
+void _cds_lfs_destroy(struct cds_lfs_stack *s)
+{
+        int ret = pthread_mutex_destroy(&s->lock);
+	assert(!ret);
+}
+
+/*
+ * ___cds_lfs_init: initialize lock-free stack (without lock).
+ * Don't pair with any destroy function.
  */
 static inline
 void ___cds_lfs_init(struct __cds_lfs_stack *s)
diff --git a/urcu/static/wfcqueue.h b/urcu/static/wfcqueue.h
index 4ababbf..67ac05f 100644
--- a/urcu/static/wfcqueue.h
+++ b/urcu/static/wfcqueue.h
@@ -92,7 +92,8 @@ static inline void _cds_wfcq_node_init(struct cds_wfcq_node *node)
 }
 
 /*
- * cds_wfcq_init: initialize wait-free queue.
+ * cds_wfcq_init: initialize wait-free queue (with lock). Pair with
+ * cds_wfcq_destroy().
  */
 static inline void _cds_wfcq_init(struct cds_wfcq_head *head,
 		struct cds_wfcq_tail *tail)
@@ -107,7 +108,19 @@ static inline void _cds_wfcq_init(struct cds_wfcq_head *head,
 }
 
 /*
- * __cds_wfcq_init: initialize wait-free queue.
+ * cds_wfcq_destroy: destroy wait-free queue (with lock). Pair with
+ * cds_wfcq_init().
+ */
+static inline void _cds_wfcq_destroy(struct cds_wfcq_head *head,
+		struct cds_wfcq_tail *tail)
+{
+	int ret = pthread_mutex_destroy(&head->lock);
+	assert(!ret);
+}
+
+/*
+ * __cds_wfcq_init: initialize wait-free queue (without lock). Don't
+ * pair with any destroy function.
  */
 static inline void ___cds_wfcq_init(struct __cds_wfcq_head *head,
 		struct cds_wfcq_tail *tail)
diff --git a/urcu/static/wfqueue.h b/urcu/static/wfqueue.h
index cc21fac..df9f62f 100644
--- a/urcu/static/wfqueue.h
+++ b/urcu/static/wfqueue.h
@@ -65,6 +65,12 @@ static inline void _cds_wfq_init(struct cds_wfq_queue *q)
 	assert(!ret);
 }
 
+static inline void _cds_wfq_destroy(struct cds_wfq_queue *q)
+{
+	int ret = pthread_mutex_destroy(&q->lock);
+	assert(!ret);
+}
+
 static inline void _cds_wfq_enqueue(struct cds_wfq_queue *q,
 				    struct cds_wfq_node *node)
 {
diff --git a/urcu/static/wfstack.h b/urcu/static/wfstack.h
index 2666b0e..e96c887 100644
--- a/urcu/static/wfstack.h
+++ b/urcu/static/wfstack.h
@@ -77,7 +77,8 @@ void _cds_wfs_node_init(struct cds_wfs_node *node)
 }
 
 /*
- * __cds_wfs_init: initialize wait-free stack.
+ * __cds_wfs_init: initialize wait-free stack. Don't pair with
+ * any destroy function.
  */
 static inline void ___cds_wfs_init(struct __cds_wfs_stack *s)
 {
@@ -85,7 +86,8 @@ static inline void ___cds_wfs_init(struct __cds_wfs_stack *s)
 }
 
 /*
- * cds_wfs_init: initialize wait-free stack.
+ * cds_wfs_init: initialize wait-free stack. Pair with
+ * cds_wfs_destroy().
  */
 static inline
 void _cds_wfs_init(struct cds_wfs_stack *s)
@@ -97,6 +99,17 @@ void _cds_wfs_init(struct cds_wfs_stack *s)
 	assert(!ret);
 }
 
+/*
+ * cds_wfs_destroy: destroy wait-free stack. Pair with
+ * cds_wfs_init().
+ */
+static inline
+void _cds_wfs_destroy(struct cds_wfs_stack *s)
+{
+	int ret = pthread_mutex_destroy(&s->lock);
+	assert(!ret);
+}
+
 static inline bool ___cds_wfs_end(void *node)
 {
 	return node == CDS_WFS_END;
diff --git a/urcu/wfcqueue.h b/urcu/wfcqueue.h
index c65780e..6c6ebba 100644
--- a/urcu/wfcqueue.h
+++ b/urcu/wfcqueue.h
@@ -135,6 +135,7 @@ struct cds_wfcq_tail {
 #define cds_wfcq_node_init		_cds_wfcq_node_init
 #define cds_wfcq_init			_cds_wfcq_init
 #define __cds_wfcq_init			___cds_wfcq_init
+#define cds_wfcq_destroy		_cds_wfcq_destroy
 #define cds_wfcq_empty			_cds_wfcq_empty
 #define cds_wfcq_enqueue		_cds_wfcq_enqueue
 
@@ -213,13 +214,22 @@ struct cds_wfcq_tail {
 extern void cds_wfcq_node_init(struct cds_wfcq_node *node);
 
 /*
- * cds_wfcq_init: initialize wait-free queue.
+ * cds_wfcq_init: initialize wait-free queue. Pair with
+ * cds_wfcq_destroy().
  */
 extern void cds_wfcq_init(struct cds_wfcq_head *head,
 		struct cds_wfcq_tail *tail);
 
 /*
- * __cds_wfcq_init: initialize wait-free queue.
+ * cds_wfcq_destroy: destroy wait-free queue. Pair with
+ * cds_wfcq_init().
+ */
+extern void cds_wfcq_destroy(struct cds_wfcq_head *head,
+		struct cds_wfcq_tail *tail);
+
+/*
+ * __cds_wfcq_init: initialize wait-free queue (without lock). Don't
+ * pair with any destroy function.
  */
 extern void __cds_wfcq_init(struct __cds_wfcq_head *head,
 		struct cds_wfcq_tail *tail);
diff --git a/urcu/wfqueue.h b/urcu/wfqueue.h
index 4cd4b13..2ba8624 100644
--- a/urcu/wfqueue.h
+++ b/urcu/wfqueue.h
@@ -71,6 +71,12 @@ void cds_wfq_init(struct cds_wfq_queue *q)
 	_cds_wfq_init(q);
 }
 
+static inline CDS_WFQ_DEPRECATED
+void cds_wfq_destroy(struct cds_wfq_queue *q)
+{
+	_cds_wfq_destroy(q);
+}
+
 static inline CDS_WFQ_DEPRECATED
 void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node)
 {
@@ -97,6 +103,9 @@ void cds_wfq_node_init(struct cds_wfq_node *node);
 extern CDS_WFQ_DEPRECATED
 void cds_wfq_init(struct cds_wfq_queue *q);
 
+extern CDS_WFQ_DEPRECATED
+void cds_wfq_destroy(struct cds_wfq_queue *q);
+
 extern CDS_WFQ_DEPRECATED
 void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node);
 
diff --git a/urcu/wfstack.h b/urcu/wfstack.h
index 28f6162..9d69305 100644
--- a/urcu/wfstack.h
+++ b/urcu/wfstack.h
@@ -108,6 +108,7 @@ typedef union {
 
 #define cds_wfs_node_init		_cds_wfs_node_init
 #define cds_wfs_init			_cds_wfs_init
+#define cds_wfs_destroy			_cds_wfs_destroy
 #define __cds_wfs_init			___cds_wfs_init
 #define cds_wfs_empty			_cds_wfs_empty
 #define cds_wfs_push			_cds_wfs_push
@@ -146,12 +147,20 @@ typedef union {
 extern void cds_wfs_node_init(struct cds_wfs_node *node);
 
 /*
- * cds_wfs_init: initialize wait-free stack.
+ * cds_wfs_init: initialize wait-free stack (with lock). Pair with
+ * cds_wfs_destroy().
  */
 extern void cds_wfs_init(struct cds_wfs_stack *s);
 
 /*
- * __cds_wfs_init: initialize wait-free stack.
+ * cds_wfs_destroy: destroy wait-free stack (with lock). Pair with
+ * cds_wfs_init().
+ */
+extern void cds_wfs_destroy(struct cds_wfs_stack *s);
+
+/*
+ * __cds_wfs_init: initialize wait-free stack (no lock). Don't pair with
+ * any destroy function.
  */
 extern void __cds_wfs_init(struct __cds_wfs_stack *s);
 
diff --git a/wfcqueue.c b/wfcqueue.c
index e28d51a..85de8ec 100644
--- a/wfcqueue.c
+++ b/wfcqueue.c
@@ -40,6 +40,12 @@ void cds_wfcq_init(struct cds_wfcq_head *head,
 	_cds_wfcq_init(head, tail);
 }
 
+void cds_wfcq_destroy(struct cds_wfcq_head *head,
+		struct cds_wfcq_tail *tail)
+{
+	_cds_wfcq_destroy(head, tail);
+}
+
 void __cds_wfcq_init(struct __cds_wfcq_head *head,
 		struct cds_wfcq_tail *tail)
 {
diff --git a/wfqueue.c b/wfqueue.c
index 14272cb..509f4f9 100644
--- a/wfqueue.c
+++ b/wfqueue.c
@@ -41,6 +41,11 @@ void cds_wfq_init(struct cds_wfq_queue *q)
 	_cds_wfq_init(q);
 }
 
+void cds_wfq_destroy(struct cds_wfq_queue *q)
+{
+	_cds_wfq_destroy(q);
+}
+
 void cds_wfq_enqueue(struct cds_wfq_queue *q, struct cds_wfq_node *node)
 {
 	_cds_wfq_enqueue(q, node);
diff --git a/wfstack.c b/wfstack.c
index 7618be3..46300f9 100644
--- a/wfstack.c
+++ b/wfstack.c
@@ -38,6 +38,11 @@ void cds_wfs_init(struct cds_wfs_stack *s)
 	_cds_wfs_init(s);
 }
 
+void cds_wfs_destroy(struct cds_wfs_stack *s)
+{
+	_cds_wfs_destroy(s);
+}
+
 void __cds_wfs_init(struct __cds_wfs_stack *s)
 {
 	___cds_wfs_init(s);