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 | |
37 | LIBC_INLINE int get_mutexattr_type(pthread_mutexattr_t attr) { |
38 | return (attr & unsigned(PThreadMutexAttrPos::TYPE_MASK)) >> |
39 | unsigned(PThreadMutexAttrPos::TYPE_SHIFT); |
40 | } |
41 | |
42 | LIBC_INLINE int get_mutexattr_robust(pthread_mutexattr_t attr) { |
43 | return (attr & unsigned(PThreadMutexAttrPos::ROBUST_MASK)) >> |
44 | unsigned(PThreadMutexAttrPos::ROBUST_SHIFT); |
45 | } |
46 | |
47 | LIBC_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 |