From 2a2dd3533944fcfd5c144541a6d2ee77ec8e8dc8 Mon Sep 17 00:00:00 2001
From: Xiang Xiao <xiaoxiang@xiaomi.com>
Date: Fri, 31 Jul 2020 22:09:28 +0800
Subject: [PATCH] =?UTF-8?q?arch/sim:=20Fix=20warning:=20implicit=20declara?=
 =?UTF-8?q?tion=20of=20function=20=E2=80=98pthread=5Fyield=E2=80=99?=
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https://stackoverflow.com/questions/32174861/why-implicit-declaration-of-pthread-yield-with-lpthread-while-all-ok-with-pthr

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
---
 arch/sim/src/sim/up_simsmp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/sim/src/sim/up_simsmp.c b/arch/sim/src/sim/up_simsmp.c
index 2584347a9e3..6a2ac32f440 100644
--- a/arch/sim/src/sim/up_simsmp.c
+++ b/arch/sim/src/sim/up_simsmp.c
@@ -41,6 +41,7 @@
 #include <pthread.h>
 #include <semaphore.h>
 #include <signal.h>
+#include <sched.h>
 #include <errno.h>
 
 /****************************************************************************
@@ -183,7 +184,7 @@ static void *sim_idle_trampoline(void *arg)
 #else
       /* Give other pthreads/CPUs a shot */
 
-      pthread_yield();
+      sched_yield();
 #endif
     }
 
@@ -418,7 +419,7 @@ int up_cpu_pause(int cpu)
 
   while (g_cpu_paused[cpu] != 0)
     {
-      pthread_yield();
+      sched_yield();
     }
 
   return 0;