diff --git a/bsd-user/main.c b/bsd-user/main.c
index 74a1ba61fb..0dc9b996e0 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -50,6 +50,43 @@ void gemu_log(const char *fmt, ...)
     vfprintf(stderr, fmt, ap);
     va_end(ap);
 }
+
+/* These are no-ops because we are not threadsafe.  */
+static inline void cpu_exec_start(CPUState *env)
+{
+}
+
+static inline void cpu_exec_end(CPUState *env)
+{
+}
+
+static inline void start_exclusive(void)
+{
+}
+
+static inline void end_exclusive(void)
+{
+}
+
+void fork_start(void)
+{
+}
+
+void fork_end(int child)
+{
+    if (child) {
+        gdbserver_fork(thread_env);
+    }
+}
+
+void cpu_list_lock(void)
+{
+}
+
+void cpu_list_unlock(void)
+{
+}
+
 #ifdef TARGET_SPARC
 #define SPARC64_STACK_BIAS 2047
 
diff --git a/bsd-user/qemu.h b/bsd-user/qemu.h
index 3ea0044f8e..d411bbbf4c 100644
--- a/bsd-user/qemu.h
+++ b/bsd-user/qemu.h
@@ -186,6 +186,8 @@ int target_msync(abi_ulong start, abi_ulong len, int flags);
 extern unsigned long last_brk;
 void mmap_lock(void);
 void mmap_unlock(void);
+void cpu_list_lock(void);
+void cpu_list_unlock(void);
 #if defined(USE_NPTL)
 void mmap_fork_start(void);
 void mmap_fork_end(int child);