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
*/
# 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) \
+ URCU_TLS_STORAGE_CLASS type name = (init)
# define URCU_TLS(name) (name)
* Note: we don't free memory at process exit, since it will be dealt
* with by the OS.
*/
-# define DEFINE_URCU_TLS_1(type, name) \
+# define DEFINE_URCU_TLS_INIT_1(type, name, do_init) \
type *__tls_access_ ## name(void) \
{ \
static struct urcu_tls __tls_ ## name = { \
+ .key = 0, \
.init_mutex = PTHREAD_MUTEX_INITIALIZER,\
.init_done = 0, \
}; \
- void *__tls_p; \
+ __typeof__(type) *__tls_p; \
if (!__tls_ ## name.init_done) { \
/* Mutex to protect concurrent init */ \
pthread_mutex_lock(&__tls_ ## name.init_mutex); \
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); \
} \
return __tls_p; \
}
+# define _URCU_TLS_INIT(init) \
+ *__tls_p = (init);
+
+# define DEFINE_URCU_TLS_INIT(type, name, init) \
+ DEFINE_URCU_TLS_INIT_1(type, name, _URCU_TLS_INIT(init))
+
# define DEFINE_URCU_TLS(type, name) \
- DEFINE_URCU_TLS_1(type, name)
+ DEFINE_URCU_TLS_INIT_1(type, name, /* empty */)
# define URCU_TLS_1(name) (*__tls_access_ ## name())