blob: 10b2f79ba8288a9404837a0d9acf6478c6b48acc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/* Copyright (c) 2015, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
/**
* @file
*
* ODP recursive read/write lock
*/
#ifndef ODP_API_RWLOCK_RECURSIVE_H_
#define ODP_API_RWLOCK_RECURSIVE_H_
#ifdef __cplusplus
extern "C" {
#endif
/**
* @addtogroup odp_locks
* @details
* <b> Recursive reader/writer lock (odp_rwlock_recursive_t) </b>
*
* This is recursive version of the reader/writer lock.
* A thread can read- or write-acquire a recursive read-write lock multiple
* times without a deadlock. To release the lock, the thread must unlock it
* the same number of times. Recursion is supported only for a pure series of
* read or write lock calls. Read and write lock calls must not be mixed when
* recursing.
*
* For example, these are supported...
* * read_lock(); read_lock(); read_unlock(); read_unlock();
* * write_lock(); write_lock(); write_unlock(); write_unlock();
*
* ... but this is not supported.
* * read_lock(); write_lock(); write_unlock(); read_unlock();
* @{
*/
/**
* @typedef odp_rwlock_recursive_t
* Recursive rwlock
*/
/**
* Initialize recursive rwlock
*
* @param lock Pointer to a lock
*/
void odp_rwlock_recursive_init(odp_rwlock_recursive_t *lock);
/**
* Acquire recursive rwlock for reading
*
* This call allows the thread to acquire the same lock multiple times for
* reading. The lock cannot be acquired for writing while holding it
* for reading.
*
* @param lock Pointer to a lock
*/
void odp_rwlock_recursive_read_lock(odp_rwlock_recursive_t *lock);
/**
* Release recursive rwlock after reading
*
* @param lock Pointer to a lock
*/
void odp_rwlock_recursive_read_unlock(odp_rwlock_recursive_t *lock);
/**
* Acquire recursive rwlock for writing
*
* This call allows the thread to acquire the same lock multiple times for
* writing. The lock cannot be acquired for reading while holding it
* for writing.
*
* @param lock Pointer to a lock
*/
void odp_rwlock_recursive_write_lock(odp_rwlock_recursive_t *lock);
/**
* Release recursive rwlock after writing
*
* @param lock Pointer to a lock
*/
void odp_rwlock_recursive_write_unlock(odp_rwlock_recursive_t *lock);
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif
|
