Index: libcfa/src/concurrency/clib/cfathread.cfa
===================================================================
--- libcfa/src/concurrency/clib/cfathread.cfa	(revision abcae5572a8a6ac044c7dc2e8fc17b873a0ff9f1)
+++ libcfa/src/concurrency/clib/cfathread.cfa	(revision 420b49833e450bfc19530f586a03156c5f61e366)
@@ -245,5 +245,5 @@
 	// Mutex
 	struct cfathread_mutex {
-		fast_lock impl;
+		linear_backoff_then_block_lock impl;
 	};
 	int cfathread_mutex_init(cfathread_mutex_t *restrict mut, const cfathread_mutexattr_t *restrict) __attribute__((nonnull (1))) { *mut = new(); return 0; }
@@ -260,5 +260,5 @@
 	// Condition
 	struct cfathread_condition {
-		condition_variable(fast_lock) impl;
+		condition_variable(linear_backoff_then_block_lock) impl;
 	};
 	int cfathread_cond_init(cfathread_cond_t *restrict cond, const cfathread_condattr_t *restrict) __attribute__((nonnull (1))) { *cond = new(); return 0; }