[dpdk-stable] [PATCH 1/2] eal/thread: fix return codes for rte_thread_setname()

[Stojaczyk, DariuszX]

+CC thomas at monjalon.net 
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> -----Original Message-----
> From: Stojaczyk, DariuszX
> Sent: Friday, June 8, 2018 2:37 PM
> To: dev at dpdk.org
> Cc: Stojaczyk, DariuszX <dariuszx.stojaczyk at intel.com>;
> thomas.monjalon at 6wind.com; stable at dpdk.org
> Subject: [PATCH 1/2] eal/thread: fix return codes for rte_thread_setname()
> 
> The doc says this function returns negative errno on error, but it currently
> returns either -1 or positive errno.
> 
> It was incorrectly assumed that pthread_setname_np() returns negative
> error numbers. It always returns positive ones, so this patch negates its
> return value before returning.
> 
> While here, also ignore rte_thread_setname() failure in
> rte_ctrl_thread_create() and print a debug message instead.
> 
> Fixes: 3901ed99c2f8 ("eal: fix thread naming on FreeBSD")
> Cc: thomas.monjalon at 6wind.com
> Cc: stable at dpdk.org
> 
> Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk at intel.com>
> ---
>  lib/librte_eal/common/eal_common_thread.c | 3 ++-
> lib/librte_eal/linuxapp/eal/eal_thread.c  | 4 ++--
>  2 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/librte_eal/common/eal_common_thread.c
> b/lib/librte_eal/common/eal_common_thread.c
> index 4239863..8110ac2 100644
> --- a/lib/librte_eal/common/eal_common_thread.c
> +++ b/lib/librte_eal/common/eal_common_thread.c
> @@ -191,7 +191,8 @@ rte_ctrl_thread_create(pthread_t *thread, const
> char *name,
>  	if (name != NULL) {
>  		ret = rte_thread_setname(*thread, name);
>  		if (ret < 0)
> -			goto fail;
> +			RTE_LOG(DEBUG, EAL,
> +				"Cannot set name for ctrl thread\n");
>  	}
> 
>  	cpu_found = 0;
> diff --git a/lib/librte_eal/linuxapp/eal/eal_thread.c
> b/lib/librte_eal/linuxapp/eal/eal_thread.c
> index f652ff9..b496fc7 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_thread.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_thread.c
> @@ -176,7 +176,7 @@ int rte_sys_gettid(void)
> 
>  int rte_thread_setname(pthread_t id, const char *name)  {
> -	int ret = -1;
> +	int ret = ENOSYS;
>  #if defined(__GLIBC__) && defined(__GLIBC_PREREQ)  #if
> __GLIBC_PREREQ(2, 12)
>  	ret = pthread_setname_np(id, name);
> @@ -184,5 +184,5 @@ int rte_thread_setname(pthread_t id, const char
> *name)  #endif
>  	RTE_SET_USED(id);
>  	RTE_SET_USED(name);
> -	return ret;
> +	return -ret;
>  }
> --
> 2.7.4