diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 155dedd..5e3ddd3 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -673,10 +673,8 @@
     libc.src.pthread.pthread_mutexattr_settype
     libc.src.pthread.pthread_once
     libc.src.pthread.pthread_rwlockattr_destroy
-    libc.src.pthread.pthread_rwlockattr_getkind_np
     libc.src.pthread.pthread_rwlockattr_getpshared
     libc.src.pthread.pthread_rwlockattr_init
-    libc.src.pthread.pthread_rwlockattr_setkind_np
     libc.src.pthread.pthread_rwlockattr_setpshared
     libc.src.pthread.pthread_setspecific
 
diff --git a/libc/include/pthread.h.def b/libc/include/pthread.h.def
index d41273b..a94d770 100644
--- a/libc/include/pthread.h.def
+++ b/libc/include/pthread.h.def
@@ -38,11 +38,6 @@
 #define PTHREAD_PROCESS_PRIVATE 0
 #define PTHREAD_PROCESS_SHARED 1
 
-#define PTHREAD_RWLOCK_PREFER_READER_NP 0
-#define PTHREAD_RWLOCK_PREFER_WRITER_NP 1
-#define PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP 2
-
-
 %%public_api()
 
 #endif // LLVM_LIBC_PTHREAD_H
diff --git a/libc/spec/posix.td b/libc/spec/posix.td
index e16353b..e7a0cf8 100644
--- a/libc/spec/posix.td
+++ b/libc/spec/posix.td
@@ -1235,11 +1235,6 @@
           [ArgSpec<PThreadRWLockAttrTPtr>]
       >,
       FunctionSpec<
-          "pthread_rwlockattr_getkind_np",
-          RetValSpec<IntType>,
-          [ArgSpec<PThreadRWLockAttrTPtr>, ArgSpec<IntPtr>]
-      >,
-      FunctionSpec<
           "pthread_rwlockattr_getpshared",
           RetValSpec<IntType>,
           [ArgSpec<ConstPThreadRWLockAttrTPtr>, ArgSpec<IntPtr>]
@@ -1250,11 +1245,6 @@
           [ArgSpec<PThreadRWLockAttrTPtr>]
       >,
       FunctionSpec<
-          "pthread_rwlockattr_setkind_np",
-          RetValSpec<IntType>,
-          [ArgSpec<PThreadRWLockAttrTPtr>, ArgSpec<IntType>]
-      >,
-      FunctionSpec<
           "pthread_rwlockattr_setpshared",
           RetValSpec<IntType>,
           [ArgSpec<PThreadRWLockAttrTPtr>, ArgSpec<IntType>]
diff --git a/libc/src/pthread/CMakeLists.txt b/libc/src/pthread/CMakeLists.txt
index e5bebb6..c57475c 100644
--- a/libc/src/pthread/CMakeLists.txt
+++ b/libc/src/pthread/CMakeLists.txt
@@ -471,16 +471,6 @@
 )
 
 add_entrypoint_object(
-  pthread_rwlockattr_getkind_np
-  SRCS
-    pthread_rwlockattr_getkind_np.cpp
-  HDRS
-    pthread_rwlockattr_getkind_np.h
-  DEPENDS
-    libc.include.pthread
-)
-
-add_entrypoint_object(
   pthread_rwlockattr_getpshared
   SRCS
     pthread_rwlockattr_getpshared.cpp
@@ -501,17 +491,6 @@
 )
 
 add_entrypoint_object(
-  pthread_rwlockattr_setkind_np
-  SRCS
-    pthread_rwlockattr_setkind_np.cpp
-  HDRS
-    pthread_rwlockattr_setkind_np.h
-  DEPENDS
-    libc.include.pthread
-    libc.include.errno
-)
-
-add_entrypoint_object(
   pthread_rwlockattr_setpshared
   SRCS
     pthread_rwlockattr_setpshared.cpp
diff --git a/libc/src/pthread/pthread_rwlockattr_getkind_np.cpp b/libc/src/pthread/pthread_rwlockattr_getkind_np.cpp
deleted file mode 100644
index 0c82179..0000000
--- a/libc/src/pthread/pthread_rwlockattr_getkind_np.cpp
+++ /dev/null
@@ -1,24 +0,0 @@
-//===-- Implementation of the pthread_rwlockattr_getkind_np ---------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "pthread_rwlockattr_getkind_np.h"
-
-#include "src/__support/common.h"
-
-#include <pthread.h> // pthread_rwlockattr_t
-
-namespace LIBC_NAMESPACE {
-
-LLVM_LIBC_FUNCTION(int, pthread_rwlockattr_getkind_np,
-                   (const pthread_rwlockattr_t *__restrict attr,
-                    int *__restrict pref)) {
-  *pref = attr->pref;
-  return 0;
-}
-
-} // namespace LIBC_NAMESPACE
diff --git a/libc/src/pthread/pthread_rwlockattr_getkind_np.h b/libc/src/pthread/pthread_rwlockattr_getkind_np.h
deleted file mode 100644
index 51f633c..0000000
--- a/libc/src/pthread/pthread_rwlockattr_getkind_np.h
+++ /dev/null
@@ -1,21 +0,0 @@
-//===-- Implementation header for pthread_rwlockattr_getkind_np -*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_LIBC_SRC_PTHREAD_PTHREAD_RWLOCKATTR_GETKIND_NP_H
-#define LLVM_LIBC_SRC_PTHREAD_PTHREAD_RWLOCKATTR_GETKIND_NP_H
-
-#include <pthread.h>
-
-namespace LIBC_NAMESPACE {
-
-int pthread_rwlockattr_getkind_np(const pthread_rwlockattr_t *__restrict attr,
-                                  int *__restrict pref);
-
-} // namespace LIBC_NAMESPACE
-
-#endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_RWLOCKATTR_GETKIND_NP_H
diff --git a/libc/src/pthread/pthread_rwlockattr_init.cpp b/libc/src/pthread/pthread_rwlockattr_init.cpp
index bbc8955..7971f17 100644
--- a/libc/src/pthread/pthread_rwlockattr_init.cpp
+++ b/libc/src/pthread/pthread_rwlockattr_init.cpp
@@ -17,7 +17,6 @@
 LLVM_LIBC_FUNCTION(int, pthread_rwlockattr_init,
                    (pthread_rwlockattr_t * attr)) {
   attr->pshared = PTHREAD_PROCESS_PRIVATE;
-  attr->pref = PTHREAD_RWLOCK_PREFER_READER_NP;
   return 0;
 }
 
diff --git a/libc/src/pthread/pthread_rwlockattr_setkind_np.cpp b/libc/src/pthread/pthread_rwlockattr_setkind_np.cpp
deleted file mode 100644
index 47fbf2a..0000000
--- a/libc/src/pthread/pthread_rwlockattr_setkind_np.cpp
+++ /dev/null
@@ -1,30 +0,0 @@
-//===-- Implementation of the pthread_rwlockattr_setkind_np ---------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#include "pthread_rwlockattr_setkind_np.h"
-
-#include "src/__support/common.h"
-
-#include <errno.h>
-#include <pthread.h> // pthread_rwlockattr_t
-
-namespace LIBC_NAMESPACE {
-
-LLVM_LIBC_FUNCTION(int, pthread_rwlockattr_setkind_np,
-                   (pthread_rwlockattr_t * attr, int pref)) {
-
-  if (pref != PTHREAD_RWLOCK_PREFER_READER_NP &&
-      pref != PTHREAD_RWLOCK_PREFER_WRITER_NP &&
-      pref != PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP)
-    return EINVAL;
-
-  attr->pref = pref;
-  return 0;
-}
-
-} // namespace LIBC_NAMESPACE
diff --git a/libc/src/pthread/pthread_rwlockattr_setkind_np.h b/libc/src/pthread/pthread_rwlockattr_setkind_np.h
deleted file mode 100644
index 00ef8e1..0000000
--- a/libc/src/pthread/pthread_rwlockattr_setkind_np.h
+++ /dev/null
@@ -1,20 +0,0 @@
-//===-- Implementation header for pthread_rwlockattr_setkind_np -*- C++ -*-===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_LIBC_SRC_PTHREAD_PTHREAD_RWLOCKATTR_SETKIND_NP_H
-#define LLVM_LIBC_SRC_PTHREAD_PTHREAD_RWLOCKATTR_SETKIND_NP_H
-
-#include <pthread.h>
-
-namespace LIBC_NAMESPACE {
-
-int pthread_rwlockattr_setkind_np(pthread_rwlockattr_t *attr, int pref);
-
-} // namespace LIBC_NAMESPACE
-
-#endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_RWLOCKATTR_SETKIND_NP_H
diff --git a/libc/test/src/pthread/CMakeLists.txt b/libc/test/src/pthread/CMakeLists.txt
index 0eeec44..ea75e65 100644
--- a/libc/test/src/pthread/CMakeLists.txt
+++ b/libc/test/src/pthread/CMakeLists.txt
@@ -68,9 +68,7 @@
     libc.include.errno
     libc.include.pthread
     libc.src.pthread.pthread_rwlockattr_destroy
-    libc.src.pthread.pthread_rwlockattr_getkind_np
     libc.src.pthread.pthread_rwlockattr_getpshared
     libc.src.pthread.pthread_rwlockattr_init
-    libc.src.pthread.pthread_rwlockattr_setkind_np
     libc.src.pthread.pthread_rwlockattr_setpshared
 )
diff --git a/libc/test/src/pthread/pthread_rwlockattr_test.cpp b/libc/test/src/pthread/pthread_rwlockattr_test.cpp
index 3791f56..6e5ae70 100644
--- a/libc/test/src/pthread/pthread_rwlockattr_test.cpp
+++ b/libc/test/src/pthread/pthread_rwlockattr_test.cpp
@@ -8,10 +8,8 @@
 
 #include "include/llvm-libc-macros/generic-error-number-macros.h" // EINVAL
 #include "src/pthread/pthread_rwlockattr_destroy.h"
-#include "src/pthread/pthread_rwlockattr_getkind_np.h"
 #include "src/pthread/pthread_rwlockattr_getpshared.h"
 #include "src/pthread/pthread_rwlockattr_init.h"
-#include "src/pthread/pthread_rwlockattr_setkind_np.h"
 #include "src/pthread/pthread_rwlockattr_setpshared.h"
 #include "test/UnitTest/Test.h"
 
@@ -27,61 +25,40 @@
 TEST(LlvmLibcPThreadRWLockAttrTest, GetDefaultValues) {
   pthread_rwlockattr_t attr;
 
-  // Invalid values.
+  // Invalid value.
   int pshared = 42;
-  int pref = 1337;
 
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_init(&attr), 0);
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_getpshared(&attr, &pshared), 0);
-  ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_getkind_np(&attr, &pref), 0);
-
   ASSERT_EQ(pshared, PTHREAD_PROCESS_PRIVATE);
-  ASSERT_EQ(pref, PTHREAD_RWLOCK_PREFER_READER_NP);
-
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_destroy(&attr), 0);
 }
 
 TEST(LlvmLibcPThreadRWLockAttrTest, SetGoodValues) {
   pthread_rwlockattr_t attr;
 
-  // Invalid values.
+  // Invalid value.
   int pshared = 42;
-  int pref = 1337;
 
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_init(&attr), 0);
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_setpshared(
                 &attr, PTHREAD_PROCESS_SHARED),
             0);
-  ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_setkind_np(
-                &attr, PTHREAD_RWLOCK_PREFER_WRITER_NP),
-            0);
-
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_getpshared(&attr, &pshared), 0);
-  ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_getkind_np(&attr, &pref), 0);
-
   ASSERT_EQ(pshared, PTHREAD_PROCESS_SHARED);
-  ASSERT_EQ(pref, PTHREAD_RWLOCK_PREFER_WRITER_NP);
-
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_destroy(&attr), 0);
 }
 
 TEST(LlvmLibcPThreadRWLockAttrTest, SetBadValues) {
   pthread_rwlockattr_t attr;
 
-  // Invalid values.
+  // Invalid value.
   int pshared = 42;
-  int pref = 1337;
 
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_init(&attr), 0);
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_setpshared(&attr, pshared),
             EINVAL);
-  ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_setkind_np(&attr, pref), EINVAL);
-
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_getpshared(&attr, &pshared), 0);
-  ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_getkind_np(&attr, &pref), 0);
-
   ASSERT_EQ(pshared, PTHREAD_PROCESS_PRIVATE);
-  ASSERT_EQ(pref, PTHREAD_RWLOCK_PREFER_READER_NP);
-
   ASSERT_EQ(LIBC_NAMESPACE::pthread_rwlockattr_destroy(&attr), 0);
 }