1 //===-- Declarations related mutex attribute objects -----------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIBC_SRC_PTHREAD_PTHREAD_MUTEXATTR_H 10 #define LLVM_LIBC_SRC_PTHREAD_PTHREAD_MUTEXATTR_H 11 12 #include "src/__support/common.h" 13 14 #include <pthread.h> 15 16 namespace LIBC_NAMESPACE { 17 18 enum class PThreadMutexAttrPos : unsigned int { 19 TYPE_SHIFT = 0, 20 TYPE_MASK = 0x3 << TYPE_SHIFT, // Type is encoded in 2 bits 21 22 ROBUST_SHIFT = 2, 23 ROBUST_MASK = 0x1 << ROBUST_SHIFT, 24 25 PSHARED_SHIFT = 3, 26 PSHARED_MASK = 0x1 << PSHARED_SHIFT, 27 28 // TODO: Add a mask for protocol and prioceiling when it is supported. 29 }; 30 31 constexpr pthread_mutexattr_t DEFAULT_MUTEXATTR = 32 PTHREAD_MUTEX_DEFAULT << unsigned(PThreadMutexAttrPos::TYPE_SHIFT) | 33 PTHREAD_MUTEX_STALLED << unsigned(PThreadMutexAttrPos::ROBUST_SHIFT) | 34 PTHREAD_PROCESS_PRIVATE << unsigned(PThreadMutexAttrPos::PSHARED_SHIFT); 35 get_mutexattr_type(pthread_mutexattr_t attr)36LIBC_INLINE int get_mutexattr_type(pthread_mutexattr_t attr) { 37 return (attr & unsigned(PThreadMutexAttrPos::TYPE_MASK)) >> 38 unsigned(PThreadMutexAttrPos::TYPE_SHIFT); 39 } 40 get_mutexattr_robust(pthread_mutexattr_t attr)41LIBC_INLINE int get_mutexattr_robust(pthread_mutexattr_t attr) { 42 return (attr & unsigned(PThreadMutexAttrPos::ROBUST_MASK)) >> 43 unsigned(PThreadMutexAttrPos::ROBUST_SHIFT); 44 } 45 get_mutexattr_pshared(pthread_mutexattr_t attr)46LIBC_INLINE int get_mutexattr_pshared(pthread_mutexattr_t attr) { 47 return (attr & unsigned(PThreadMutexAttrPos::PSHARED_MASK)) >> 48 unsigned(PThreadMutexAttrPos::PSHARED_SHIFT); 49 } 50 51 } // namespace LIBC_NAMESPACE 52 53 #endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_MUTEXATTR_H 54