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//===-- Declarations related mutex attribute objects -----------*- 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_MUTEXATTR_H
#define LLVM_LIBC_SRC_PTHREAD_PTHREAD_MUTEXATTR_H
#include "src/__support/common.h"
#include <pthread.h>
namespace LIBC_NAMESPACE {
enum class PThreadMutexAttrPos : unsigned int {
TYPE_SHIFT = 0,
TYPE_MASK = 0x3 << TYPE_SHIFT, // Type is encoded in 2 bits
ROBUST_SHIFT = 2,
ROBUST_MASK = 0x1 << ROBUST_SHIFT,
PSHARED_SHIFT = 3,
PSHARED_MASK = 0x1 << PSHARED_SHIFT,
// TODO: Add a mask for protocol and prioceiling when it is supported.
};
constexpr pthread_mutexattr_t DEFAULT_MUTEXATTR =
PTHREAD_MUTEX_DEFAULT << unsigned(PThreadMutexAttrPos::TYPE_SHIFT) |
PTHREAD_MUTEX_STALLED << unsigned(PThreadMutexAttrPos::ROBUST_SHIFT) |
PTHREAD_PROCESS_PRIVATE << unsigned(PThreadMutexAttrPos::PSHARED_SHIFT);
LIBC_INLINE int get_mutexattr_type(pthread_mutexattr_t attr) {
return (attr & unsigned(PThreadMutexAttrPos::TYPE_MASK)) >>
unsigned(PThreadMutexAttrPos::TYPE_SHIFT);
}
LIBC_INLINE int get_mutexattr_robust(pthread_mutexattr_t attr) {
return (attr & unsigned(PThreadMutexAttrPos::ROBUST_MASK)) >>
unsigned(PThreadMutexAttrPos::ROBUST_SHIFT);
}
} // namespace LIBC_NAMESPACE
#endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_MUTEXATTR_H