| 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 | |
| 36 | LIBC_INLINE int get_mutexattr_type(pthread_mutexattr_t attr) { |
| 37 | return (attr & unsigned(PThreadMutexAttrPos::TYPE_MASK)) >> |
| 38 | unsigned(PThreadMutexAttrPos::TYPE_SHIFT); |
| 39 | } |
| 40 | |
| 41 | LIBC_INLINE int get_mutexattr_robust(pthread_mutexattr_t attr) { |
| 42 | return (attr & unsigned(PThreadMutexAttrPos::ROBUST_MASK)) >> |
| 43 | unsigned(PThreadMutexAttrPos::ROBUST_SHIFT); |
| 44 | } |
| 45 | |
| 46 | } // namespace LIBC_NAMESPACE |
| 47 | |
| 48 | #endif // LLVM_LIBC_SRC_PTHREAD_PTHREAD_MUTEXATTR_H |
| 49 |