diff --git a/musl_src.gni b/musl_src.gni
index 2e0a75969da21c9825c3d95c2d0793402ee3190a..21e78ff43f0178274961dcbb072119664574cfc2 100644
--- a/musl_src.gni
+++ b/musl_src.gni
@@ -2119,9 +2119,11 @@ musl_src_porting_file = [
   "src/thread/pthread_mutex_lock.c",
   "src/thread/pthread_mutex_timedlock_monotonic_np.c",
   "src/thread/pthread_mutex_lock_timeout_np.c",
+  "src/thread/pthread_mutex_init.c",
   "src/thread/pthread_rwlock_clockrdlock.c",
   "src/thread/pthread_rwlock_timedrdlock.c",
   "src/thread/pthread_rwlock_timedrdlock_monotonic_np.c",
+  "src/thread/pthread_rwlock_init.c",
   "src/thread/pthread_cond_timedwait_monotonic_np.c",
   "src/thread/pthread_cond_timeout_np.c",
   "src/thread/pthread_cond_clockwait.c",
diff --git a/porting/linux/user/src/thread/pthread_mutex_init.c b/porting/linux/user/src/thread/pthread_mutex_init.c
new file mode 100644
index 0000000000000000000000000000000000000000..f606428db366ead2f84b6eb05873ac9a3f774441
--- /dev/null
+++ b/porting/linux/user/src/thread/pthread_mutex_init.c
@@ -0,0 +1,8 @@
+#include "pthread_impl.h"
+
+int pthread_mutex_init(pthread_mutex_t *restrict m, const pthread_mutexattr_t *restrict a)
+{
+	__builtin_memset(m, 0, sizeof(pthread_mutex_t));
+	if (a) m->_m_type = a->__attr;
+	return 0;
+}
diff --git a/porting/linux/user/src/thread/pthread_rwlock_init.c b/porting/linux/user/src/thread/pthread_rwlock_init.c
new file mode 100644
index 0000000000000000000000000000000000000000..27cf8723e11bafc0661117f6f7e939381ff36218
--- /dev/null
+++ b/porting/linux/user/src/thread/pthread_rwlock_init.c
@@ -0,0 +1,8 @@
+#include "pthread_impl.h"
+
+int pthread_rwlock_init(pthread_rwlock_t *restrict rw, const pthread_rwlockattr_t *restrict a)
+{
+	__builtin_memset(rw, 0, sizeof(pthread_rwlock_t));
+	if (a) rw->_rw_shared = a->__attr[0]*128;
+	return 0;
+}