diff --git a/libc/src/pthread/pthread_condattr_getpshared.cpp b/libc/src/pthread/pthread_condattr_getpshared.cpp
@@ -0,0 +1,24 @@
+//===-- Implementation of the pthread_condattr_getpshared -----------------===//
+//
+// 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_condattr_getpshared.h"
+
+#include "src/__support/common.h"
+
+#include <pthread.h>
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, pthread_condattr_getpshared,
+                   (const pthread_condattr_t *__restrict attr,
+                    int *__restrict pshared)) {
+  *pshared = attr->pshared;
+  return 0;
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/pthread/pthread_condattr_getpshared.h b/libc/src/pthread/pthread_condattr_getpshared.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for pthread_condattr_getpshared ---*- 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_CONDATTR_PSHARED_H
+#define LLVM_LIBC_SRC_PTHREAD_PTHREAD_CONDATTR_PSHARED_H
+
+#include <pthread.h>
+
+namespace LIBC_NAMESPACE {
+
+int pthread_condattr_getpshared(const pthread_condattr_t *__restrict attr,
+                                int *__restrict pshared);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_CONDATTR_PSHARED_H
diff --git a/libc/src/pthread/pthread_condattr_init.cpp b/libc/src/pthread/pthread_condattr_init.cpp
@@ -0,0 +1,24 @@
+//===-- Implementation of the pthread_condattr_init -----------------------===//
+//
+// 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_condattr_init.h"
+
+#include "src/__support/common.h"
+
+#include <pthread.h> // pthread_condattr_t, PTHREAD_PROCESS_PRIVATE
+#include <time.h>    // CLOCK_REALTIME
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, pthread_condattr_init, (pthread_condattr_t * attr)) {
+  attr->clock = CLOCK_REALTIME;
+  attr->pshared = PTHREAD_PROCESS_PRIVATE;
+  return 0;
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/pthread/pthread_condattr_init.h b/libc/src/pthread/pthread_condattr_init.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for pthread_condattr_init ---------*- 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_CONDATTR_INIT_H
+#define LLVM_LIBC_SRC_PTHREAD_PTHREAD_CONDATTR_INIT_H
+
+#include <pthread.h>
+
+namespace LIBC_NAMESPACE {
+
+int pthread_condattr_init(pthread_condattr_t *attr);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_CONDATTR_INIT_H
diff --git a/libc/src/pthread/pthread_condattr_setclock.cpp b/libc/src/pthread/pthread_condattr_setclock.cpp
@@ -0,0 +1,30 @@
+//===-- Implementation of the pthread_condattr_setclock -------------------===//
+//
+// 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_condattr_setclock.h"
+
+#include "src/__support/common.h"
+
+#include <errno.h>     // EINVAL
+#include <pthread.h>   // pthread_condattr_t
+#include <sys/types.h> // clockid_t
+#include <time.h>      // CLOCK_MONOTONIC, CLOCK_REALTIME
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, pthread_condattr_setclock,
+                   (pthread_condattr_t * attr, clockid_t clock)) {
+
+  if (clock != CLOCK_MONOTONIC && clock != CLOCK_REALTIME)
+    return EINVAL;
+
+  attr->clock = clock;
+  return 0;
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/pthread/pthread_condattr_setclock.h b/libc/src/pthread/pthread_condattr_setclock.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for pthread_condattr_setclock -----*- 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_CONDATTR_SETCLOCK_H
+#define LLVM_LIBC_SRC_PTHREAD_PTHREAD_CONDATTR_SETCLOCK_H
+
+#include <pthread.h>
+#include <sys/types.h> // clockid_t
+
+namespace LIBC_NAMESPACE {
+
+int pthread_condattr_setclock(pthread_condattr_t *attr, clockid_t clock);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_CONDATTR_SETCLOCK_H
diff --git a/libc/src/pthread/pthread_condattr_setpshared.cpp b/libc/src/pthread/pthread_condattr_setpshared.cpp
@@ -0,0 +1,28 @@
+//===-- Implementation of the pthread_condattr_setpshared -----------------===//
+//
+// 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_condattr_setpshared.h"
+
+#include "src/__support/common.h"
+
+#include <errno.h> // EINVAL
+#include <pthread.h> // pthread_condattr_t, PTHREAD_PROCESS_SHARED, PTHREAD_PROCESS_PRIVATE
+
+namespace LIBC_NAMESPACE {
+
+LLVM_LIBC_FUNCTION(int, pthread_condattr_setpshared,
+                   (pthread_condattr_t * attr, int pshared)) {
+
+  if (pshared != PTHREAD_PROCESS_SHARED && pshared != PTHREAD_PROCESS_PRIVATE)
+    return EINVAL;
+
+  attr->pshared = pshared;
+  return 0;
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/pthread/pthread_condattr_setpshared.h b/libc/src/pthread/pthread_condattr_setpshared.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for pthread_condattr_setpshared ---*- 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_CONDATTR_SETPSHARED_H
+#define LLVM_LIBC_SRC_PTHREAD_PTHREAD_CONDATTR_SETPSHARED_H
+
+#include <pthread.h>
+
+namespace LIBC_NAMESPACE {
+
+int pthread_condattr_setpshared(pthread_condattr_t *attr, int pshared);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_CONDATTR_SETPSHARED_H
diff --git a/libc/test/src/pthread/CMakeLists.txt b/libc/test/src/pthread/CMakeLists.txt
@@ -39,3 +39,15 @@ add_libc_unittest(
     libc.src.pthread.pthread_mutexattr_setrobust
     libc.src.pthread.pthread_mutexattr_settype
 )
+
+add_libc_unittest(
+  pthread_condattr_test
+  SUITE
+    libc_pthread_unittests
+  SRCS
+    pthread_condattr_test.cpp
+  DEPENDS
+    libc.include.errno
+    libc.include.pthread
+    libc.include.time
+  )
diff --git a/libc/test/src/pthread/pthread_condattr_test.cpp b/libc/test/src/pthread/pthread_condattr_test.cpp
@@ -0,0 +1,71 @@
+//===-- Unittests for pthread_condattr_t ----------------------------------===//
+//
+// 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 "test/UnitTest/Test.h"
+
+#include <errno.h>
+#include <pthread.h>
+#include <time.h>
+
+TEST(LlvmLibcPThreadCondAttrTest, InitAndDestroy) {
+  pthread_condattr_t cond;
+  ASSERT_EQ(pthread_condattr_init(&cond), 0);
+  ASSERT_EQ(pthread_condattr_destroy(&cond), 0);
+}
+
+TEST(LlvmLibcPThreadCondAttrTest, GetDefaultValues) {
+  pthread_condattr_t cond;
+
+  // Invalid clock id.
+  clockid_t clock = 7;
+  // Invalid value.
+  int pshared = 42;
+
+  ASSERT_EQ(pthread_condattr_init(&cond), 0);
+  ASSERT_EQ(pthread_condattr_getclock(&cond, &clock), 0);
+  ASSERT_EQ(clock, CLOCK_REALTIME);
+  ASSERT_EQ(pthread_condattr_getpshared(&cond, &pshared), 0);
+  ASSERT_EQ(pshared, PTHREAD_PROCESS_PRIVATE);
+  ASSERT_EQ(pthread_condattr_destroy(&cond), 0);
+}
+
+TEST(LlvmLibcPThreadCondAttrTest, SetGoodValues) {
+  pthread_condattr_t cond;
+
+  // Invalid clock id.
+  clockid_t clock = 7;
+  // Invalid value.
+  int pshared = 42;
+
+  ASSERT_EQ(pthread_condattr_init(&cond), 0);
+  ASSERT_EQ(pthread_condattr_setclock(&cond, CLOCK_MONOTONIC), 0);
+  ASSERT_EQ(pthread_condattr_getclock(&cond, &clock), 0);
+  ASSERT_EQ(clock, CLOCK_MONOTONIC);
+  ASSERT_EQ(pthread_condattr_setpshared(&cond, PTHREAD_PROCESS_SHARED), 0);
+  ASSERT_EQ(pthread_condattr_getpshared(&cond, &pshared), 0);
+  ASSERT_EQ(pshared, PTHREAD_PROCESS_SHARED);
+  ASSERT_EQ(pthread_condattr_destroy(&cond), 0);
+}
+
+TEST(LlvmLibcPThreadCondAttrTest, SetBadValues) {
+  pthread_condattr_t cond;
+
+  // Invalid clock id.
+  clockid_t clock = 7;
+  // Invalid value.
+  int pshared = 42;
+
+  ASSERT_EQ(pthread_condattr_init(&cond), 0);
+  ASSERT_EQ(pthread_condattr_setclock(&cond, clock), EINVAL);
+  ASSERT_EQ(pthread_condattr_getclock(&cond, &clock), 0);
+  ASSERT_EQ(clock, CLOCK_REALTIME);
+  ASSERT_EQ(pthread_condattr_setpshared(&cond, pshared), EINVAL);
+  ASSERT_EQ(pthread_condattr_getpshared(&cond, &pshared), 0);
+  ASSERT_EQ(pshared, PTHREAD_PROCESS_PRIVATE);
+  ASSERT_EQ(pthread_condattr_destroy(&cond), 0);
+}