Mac Os Warning: implicit declaration of function 'pthread_setname_np' about c-thread-pool HOT 6 CLOSED

--- thpool_original.c	2018-03-21 13:46:04.000000000 -0700
+++ thpool_pedantic.c	2018-03-21 13:45:05.000000000 -0700
@@ -8,7 +8,17 @@
  *
  ********************************/
 
-#define _POSIX_C_SOURCE 200809L
+
+#	if defined(__APPLE__)
+#		include <AvailabilityMacros.h>
+#	else
+#		ifndef _POSIX_C_SOURCE
+#			define _POSIX_C_SOURCE 200809L
+#		elif _POSIX_C_SOURCE < 200809L
+#			error "Valid _POSIX_C_SOURCE version required."
+#		endif
+#	endif
+
 #include <unistd.h>
 #include <signal.h>
 #include <stdio.h>
@@ -94,7 +104,7 @@
 
 
 static int  thread_init(thpool_* thpool_p, struct thread** thread_p, int id);
-static void* thread_do(struct thread* thread_p);
+static void* thread_do(void * arg);
 static void  thread_hold(int sig_id);
 static void  thread_destroy(struct thread* thread_p);
 
@@ -123,8 +133,8 @@
 	threads_on_hold   = 0;
 	threads_keepalive = 1;
 
-	if (num_threads < 0){
-		num_threads = 0;
+	if (num_threads < 1){
+		num_threads = 1;
 	}
 
 	/* Make new thread pool */
@@ -290,7 +300,7 @@
 	(*thread_p)->thpool_p = thpool_p;
 	(*thread_p)->id       = id;
 
-	pthread_create(&(*thread_p)->pthread, NULL, (void *)thread_do, (*thread_p));
+	pthread_create(&(*thread_p)->pthread, NULL, thread_do, (*thread_p));
 	pthread_detach((*thread_p)->pthread);
 	return 0;
 }
@@ -314,8 +324,13 @@
 * @param  thread        thread that will run this function
 * @return nothing
 */
-static void* thread_do(struct thread* thread_p){
+static void* thread_do(void * arg){
 
+	struct thread * thread_p = (struct thread *)arg;
+	if (thread_p == NULL){
+		err("thread_do(): Could not access cookie\n");
+		return NULL;
+	}
 	/* Set thread name for profiling and debuging */
 	char thread_name[128] = {0};
 	sprintf(thread_name, "thread-pool-%d", thread_p->id);

#if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE)) || defined(_DARWIN_C_SOURCE)

/* returns non-zero if pthread_create or cthread_fork have been called */
__OSX_AVAILABLE_STARTING(__MAC_10_4, __IPHONE_2_0)
int pthread_is_threaded_np(void);

#if ! defined(_POSIX_C_SOURCE)
#define _POSIX_C_SOURCE 200809L
#endif