X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Furcu%2Ftls-compat.h;h=1f3ef0fbbdb5bfe8f03d58e642ccdc1373e2f54c;hb=HEAD;hp=c17aca36b2c86a4b94f95e1c97c8aaa327f1f4a7;hpb=cb1f3ebfa99c3d49962fa2421ea3ae33d8dad757;p=userspace-rcu.git

diff --git a/include/urcu/tls-compat.h b/include/urcu/tls-compat.h
index c17aca3..1f3ef0f 100644
--- a/include/urcu/tls-compat.h
+++ b/include/urcu/tls-compat.h
@@ -1,26 +1,12 @@
+// SPDX-FileCopyrightText: 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
 #ifndef _URCU_TLS_COMPAT_H
 #define _URCU_TLS_COMPAT_H
 
 /*
- * urcu/tls-compat.h
- *
  * Userspace RCU library - Thread-Local Storage Compatibility Header
- *
- * Copyright 2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <stdlib.h>
@@ -32,7 +18,21 @@
 extern "C" {
 #endif
 
-#ifdef CONFIG_RCU_TLS	/* Based on ax_tls.m4 */
+#ifdef CONFIG_RCU_TLS
+
+/*
+ * Default to '__thread' on all C and C++ compilers except MSVC. While C11 has
+ * '_Thread_local' and C++11 has 'thread_local', only '__thread' seems to have
+ * a compatible implementation when linking public extern symbols across
+ * language boundaries.
+ *
+ * For more details, see 'https://gcc.gnu.org/onlinedocs/gcc/Thread-Local.html'.
+ */
+#if defined(_MSC_VER)
+# define URCU_TLS_STORAGE_CLASS	__declspec(thread)
+#else
+# define URCU_TLS_STORAGE_CLASS	__thread
+#endif
 
 /*
  * Hint: How to define/declare TLS variables of compound types
@@ -65,13 +65,13 @@ extern "C" {
  */
 
 # define DECLARE_URCU_TLS(type, name)	\
-	CONFIG_RCU_TLS type name
+	URCU_TLS_STORAGE_CLASS type name
 
 # define DEFINE_URCU_TLS(type, name)	\
-	CONFIG_RCU_TLS type name
+	URCU_TLS_STORAGE_CLASS type name
 
 # define DEFINE_URCU_TLS_INIT(type, name, init)	\
-	CONFIG_RCU_TLS type name = (init)
+	URCU_TLS_STORAGE_CLASS type name = (init)
 
 # define URCU_TLS(name)		(name)
 
@@ -102,6 +102,7 @@ struct urcu_tls {
 	type *__tls_access_ ## name(void)			\
 	{							\
 		static struct urcu_tls __tls_ ## name = {	\
+			.key = 0,				\
 			.init_mutex = PTHREAD_MUTEX_INITIALIZER,\
 			.init_done = 0,				\
 		};						\
@@ -118,9 +119,9 @@ struct urcu_tls {
 			pthread_mutex_unlock(&__tls_ ## name.init_mutex); \
 		}						\
 		cmm_smp_rmb();	/* read init_done before getting key */ \
-		__tls_p = pthread_getspecific(__tls_ ## name.key); \
+		__tls_p = (__typeof__(type) *) pthread_getspecific(__tls_ ## name.key); \
 		if (caa_unlikely(__tls_p == NULL)) {		\
-			__tls_p = calloc(1, sizeof(type));	\
+			__tls_p = (__typeof__(type) *) calloc(1, sizeof(type));	\
 			do_init					\
 			(void) pthread_setspecific(__tls_ ## name.key,	\
 				__tls_p);			\