added a HAVE_THREADS flag

1 files changed, 8 insertions, 0 deletions

diff --git a/src/port/string.c b/src/port/string.c
index 398788c..9c360d0 100644
--- a/src/port/string.c
+++ b/src/port/string.c
@@ -49,19 +49,23 @@ char *wolf_port_strdup( const char *s ) {
 #include <errno.h>		/* for errno */
 #include "threads/mutex.h"	/* for mutexes */
 
+#ifdef HAVE_THREADS
 static bool mutex_initialized = false;
 static wolf_mutex_t mutex;
+#endif
 
 int wolf_port_strerror_r( int num, char *buf, size_t buflen ) {
 	int safe_errno = errno;
 	const char *msg;
 
 	/* critical section as strerror is not thread-safe */
+#ifdef HAVE_THREADS
 	if( !mutex_initialized ) {
 		wolf_mutex_init( &mutex );
 		mutex_initialized = true;
 	}
 	wolf_mutex_lock( &mutex );
+#endif
 
 	msg = strerror( num );
 	/* TODO: can we detect illegal error numbers? For sure on Linux NULL
@@ -73,13 +77,17 @@ int wolf_port_strerror_r( int num, char *buf, size_t buflen ) {
 		/* Linux returns an empty string in this case, why? */
 		(void)snprintf( buf, buflen, "Unknown error %d", num );
 		errno = EINVAL;
+#ifdef HAVE_THREADS		
 		wolf_mutex_unlock( &mutex );
+#endif
 		return -1;
 	}
 
 	strncpy( buf, msg, buflen-1 );
 	errno = safe_errno;
+#ifdef HAVE_THREADS
 	wolf_mutex_unlock( &mutex );
+#endif
 	return 0;
 }