Fix YIELD definitions.

src/xpdev/genwrap.h

@@ -175,7 +175,7 @@ extern "C" {
 #elif defined(__unix__)
 
 #ifndef SLEEP
-	#ifndef SBBS
+	#ifndef YIELD
 	#define	YIELD()
 	#endif
 	#define SLEEP(x)		({	int y=x; struct timeval tv; \

src/xpdev/threadwrap.h

@@ -49,18 +49,21 @@ extern "C" {
 
 	#include <sys/param.h>
 	#include <pthread.h>	/* POSIX threads and mutexes */
-#ifdef __linux__
-	#define YIELD()		sched_yield()
-#else
-	#define YIELD()		pthread_yield()
-#endif
-#if defined(_NEED_SEM)
-	#include "sem.h"
-#else
-	#include <semaphore.h>	/* POSIX semaphores */
-#endif
-	ulong _beginthread(void( *start_address )( void * )
-		,unsigned stack_size, void *arglist);
+	#undef YIELD
+	#if defined(__linux__)
+		#define YIELD()		sched_yield()
+	#elif defined(_PTH_PTHREAD_H_)
+		#define YIELD()		pth_yield(NULL)
+	#else
+		#define YIELD()		pthread_yield()
+	#endif
+	#if defined(_NEED_SEM)
+		#include "sem.h"
+	#else
+		#include <semaphore.h>	/* POSIX semaphores */
+	#endif
+		ulong _beginthread(void( *start_address )( void * )
+			,unsigned stack_size, void *arglist);
 
 #elif defined(_WIN32)	
 
@@ -127,7 +130,6 @@ extern "C" {
 #define SLEEP(x)		({	int y=x; struct timeval tv; \
 								tv.tv_sec=(y/1000); tv.tv_usec=((y%1000)*1000); \
 								pth_nap(tv); })
-#define YIELD()		pth_yield(NULL)
 #endif
 
 #endif	/* Don't add anything after this line */