[lttng-dev] [PATCH 1/2] urcu: add hint to DEFINE_URCU_TLS() for compound types

[Mathieu Desnoyers]

* Lai Jiangshan (laijs at cn.fujitsu.com) wrote:
> Just a hint.

merged, thanks!

Mathieu

> 
> Signed-off-by: Lai Jiangshan <laijs at cn.fujitsu.com>
> ---
>  urcu/tls-compat.h |   15 +++++++++++++++
>  1 files changed, 15 insertions(+), 0 deletions(-)
> 
> diff --git a/urcu/tls-compat.h b/urcu/tls-compat.h
> index 9686eca..192a536 100644
> --- a/urcu/tls-compat.h
> +++ b/urcu/tls-compat.h
> @@ -34,6 +34,21 @@ extern "C" {
>  
>  #ifdef CONFIG_RCU_TLS	/* Based on ax_tls.m4 */
>  
> +/*
> + * Hint: How to define/declare TLS variables of compound types
> + *       such as array or function pointers?
> + *
> + * Answer: Use typedef to assign a type_name to the compound type.
> + * Example: Define a TLS variable which is an int array with len=4:
> + *
> + * 	typedef int my_int_array_type[4];
> + * 	DEFINE_URCU_TLS(my_int_array_type, var_name);
> + *
> + * Another exmaple:
> + * 	typedef void (*call_rcu_flavor)(struct rcu_head *, XXXX);
> + * 	DECLARE_URCU_TLS(call_rcu_flavor, p_call_rcu);
> + */
> +
>  # define DECLARE_URCU_TLS(type, name)	\
>  	CONFIG_RCU_TLS type name
>  
> -- 
> 1.7.4.4
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com