Index: src/exceptions/OFException.m
==================================================================
--- src/exceptions/OFException.m
+++ src/exceptions/OFException.m
@@ -27,19 +27,20 @@
 #endif
 
 #import "OFException.h"
 #import "OFArray.h"
 #import "OFLocale.h"
-#ifdef OF_HAVE_THREADS
-# import "OFMutex.h"
-#endif
 #import "OFString.h"
 #import "OFSystemInfo.h"
 
 #import "OFInitializationFailedException.h"
 #import "OFLockFailedException.h"
 #import "OFUnlockFailedException.h"
+
+#ifdef OF_HAVE_THREADS
+# import "mutex.h"
+#endif
 
 #if defined(OF_WINDOWS) && defined(OF_HAVE_SOCKETS)
 # include <winerror.h>
 #endif
 
@@ -68,20 +69,20 @@
 extern int _Unwind_VRS_Get(struct _Unwind_Context *, int, uint32_t, int,
     void *);
 #endif
 
 #if !defined(HAVE_STRERROR_R) && defined(OF_HAVE_THREADS)
-static OFMutex *mutex;
+static of_mutex_t mutex;
 
 OF_CONSTRUCTOR()
 {
-	mutex = [[OFMutex alloc] init];
+	OF_ENSURE(of_mutex_new(&mutex) == 0);
 }
 
 OF_DESTRUCTOR()
 {
-	[mutex release];
+	of_mutex_free(&mutex);
 }
 #endif
 
 OFString *
 of_strerror(int errNo)
@@ -190,19 +191,22 @@
 
 	ret = [OFString stringWithCString: buffer
 				 encoding: [OFLocale encoding]];
 #else
 # ifdef OF_HAVE_THREADS
-	[mutex lock];
+	if (of_mutex_lock(&mutex) != 0)
+		@throw [OFLockFailedException exception];
+
 	@try {
 # endif
 		ret = [OFString
 		    stringWithCString: strerror(errNo)
 			     encoding: [OFLocale encoding]];
 # ifdef OF_HAVE_THREADS
 	} @finally {
-		[mutex unlock];
+		if (of_mutex_unlock(&mutex) != 0)
+			@throw [OFUnlockFailedException exception];
 	}
 # endif
 #endif
 
 	return ret;