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 #include "src/__support/macros/config.h" 14 15 #include <pthread.h> 16 17 namespace LIBC_NAMESPACE_DECL { 18 19 enum class PThreadMutexAttrPos : unsigned int { 20 TYPE_SHIFT = 0, 21 TYPE_MASK = 0x3 << TYPE_SHIFT, // Type is encoded in 2 bits 22 23 ROBUST_SHIFT = 2, 24 ROBUST_MASK = 0x1 << ROBUST_SHIFT, 25 26 PSHARED_SHIFT = 3, 27 PSHARED_MASK = 0x1 << PSHARED_SHIFT, 28 29 // TODO: Add a mask for protocol and prioceiling when it is supported. 30 }; 31 32 constexpr pthread_mutexattr_t DEFAULT_MUTEXATTR = 33 PTHREAD_MUTEX_DEFAULT << unsigned(PThreadMutexAttrPos::TYPE_SHIFT) | 34 PTHREAD_MUTEX_STALLED << unsigned(PThreadMutexAttrPos::ROBUST_SHIFT) | 35 PTHREAD_PROCESS_PRIVATE << unsigned(PThreadMutexAttrPos::PSHARED_SHIFT); 36 get_mutexattr_type(pthread_mutexattr_t attr)37LIBC_INLINE int get_mutexattr_type(pthread_mutexattr_t attr) { 38 return (attr & unsigned(PThreadMutexAttrPos::TYPE_MASK)) >> 39 unsigned(PThreadMutexAttrPos::TYPE_SHIFT); 40 } 41 get_mutexattr_robust(pthread_mutexattr_t attr)42LIBC_INLINE int get_mutexattr_robust(pthread_mutexattr_t attr) { 43 return (attr & unsigned(PThreadMutexAttrPos::ROBUST_MASK)) >> 44 unsigned(PThreadMutexAttrPos::ROBUST_SHIFT); 45 } 46 get_mutexattr_pshared(pthread_mutexattr_t attr)47LIBC_INLINE int get_mutexattr_pshared(pthread_mutexattr_t attr) { 48 return (attr & unsigned(PThreadMutexAttrPos::PSHARED_MASK)) >> 49 unsigned(PThreadMutexAttrPos::PSHARED_SHIFT); 50 } 51 52 } // namespace LIBC_NAMESPACE_DECL 53 54 #endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_MUTEXATTR_H 55