Reland: [libc][POSIX][pthreads] implemented missing pthread_rwlockattr functions (llvm#93622)

New pull request for llvm#89443

The previous PR was reverted after breaking fullbuild due to a missing
struct declaration, which I forgot to commit.

Reverts revert and adds the missing pthread_rwlockattr_getkind_np /
pthread_rwlockattr_setkind_np functions and tests respecitvely.

Author: HendrikHuebner

libc/config/linux/x86_64/entrypoints.txt

@@ -673,8 +673,10 @@ if(LLVM_LIBC_FULL_BUILD)
     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
 

libc/include/llvm-libc-types/pthread_rwlockattr_t.h

@@ -10,6 +10,7 @@
 
 typedef struct {
   int pshared;
+  int pref;
 } pthread_rwlockattr_t;
 
 #endif // LLVM_LIBC_TYPES_PTHREAD_RWLOCKATTR_T_H

libc/include/pthread.h.def

@@ -38,6 +38,11 @@ enum {
 #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

libc/spec/posix.td

@@ -1234,6 +1234,11 @@ def POSIX : StandardSpec<"POSIX"> {
           RetValSpec<IntType>,
           [ArgSpec<PThreadRWLockAttrTPtr>]
       >,
+      FunctionSpec<
+          "pthread_rwlockattr_getkind_np",
+          RetValSpec<IntType>,
+          [ArgSpec<PThreadRWLockAttrTPtr>, ArgSpec<IntPtr>]
+      >,
       FunctionSpec<
           "pthread_rwlockattr_getpshared",
           RetValSpec<IntType>,
@@ -1244,6 +1249,11 @@ def POSIX : StandardSpec<"POSIX"> {
           RetValSpec<IntType>,
           [ArgSpec<PThreadRWLockAttrTPtr>]
       >,
+      FunctionSpec<
+          "pthread_rwlockattr_setkind_np",
+          RetValSpec<IntType>,
+          [ArgSpec<PThreadRWLockAttrTPtr>, ArgSpec<IntType>]
+      >,
       FunctionSpec<
           "pthread_rwlockattr_setpshared",
           RetValSpec<IntType>,

libc/src/pthread/CMakeLists.txt

@@ -470,6 +470,16 @@ add_entrypoint_object(
     libc.include.pthread
 )
 
+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
@@ -490,6 +500,17 @@ add_entrypoint_object(
     libc.include.pthread
 )
 
+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

libc/src/pthread/pthread_rwlockattr_getkind_np.cpp

@@ -0,0 +1,24 @@
+//===-- 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

libc/src/pthread/pthread_rwlockattr_getkind_np.h

@@ -0,0 +1,21 @@
+//===-- 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

libc/src/pthread/pthread_rwlockattr_init.cpp

@@ -17,6 +17,7 @@ namespace LIBC_NAMESPACE {
 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;
 }
 

libc/src/pthread/pthread_rwlockattr_setkind_np.cpp

@@ -0,0 +1,30 @@
+//===-- 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

libc/src/pthread/pthread_rwlockattr_setkind_np.h

@@ -0,0 +1,20 @@
+//===-- 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