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

[Dariusz Stojaczyk]

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