Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include "util.h"
3#include "rwsem.h"
4
5#if RWS_ERRORCHECK
6#include "mutex.h"
7#endif
8
9int init_rwsem(struct rw_semaphore *sem)
10{
11#if RWS_ERRORCHECK
12 mutex_init(&sem->mtx);
13 return 0;
14#else
15 return pthread_rwlock_init(&sem->lock, NULL);
16#endif
17}
18
19int exit_rwsem(struct rw_semaphore *sem)
20{
21#if RWS_ERRORCHECK
22 mutex_destroy(&sem->mtx);
23 return 0;
24#else
25 return pthread_rwlock_destroy(&sem->lock);
26#endif
27}
28
29int down_read(struct rw_semaphore *sem)
30 NO_THREAD_SAFETY_ANALYSIS
31{
32#if RWS_ERRORCHECK
33 mutex_lock(&sem->mtx);
34 return 0;
35#else
36 return perf_singlethreaded ? 0 : pthread_rwlock_rdlock(&sem->lock);
37#endif
38}
39
40int up_read(struct rw_semaphore *sem)
41 NO_THREAD_SAFETY_ANALYSIS
42{
43#if RWS_ERRORCHECK
44 mutex_unlock(&sem->mtx);
45 return 0;
46#else
47 return perf_singlethreaded ? 0 : pthread_rwlock_unlock(&sem->lock);
48#endif
49}
50
51int down_write(struct rw_semaphore *sem)
52 NO_THREAD_SAFETY_ANALYSIS
53{
54#if RWS_ERRORCHECK
55 mutex_lock(&sem->mtx);
56 return 0;
57#else
58 return perf_singlethreaded ? 0 : pthread_rwlock_wrlock(&sem->lock);
59#endif
60}
61
62int up_write(struct rw_semaphore *sem)
63 NO_THREAD_SAFETY_ANALYSIS
64{
65#if RWS_ERRORCHECK
66 mutex_unlock(&sem->mtx);
67 return 0;
68#else
69 return perf_singlethreaded ? 0 : pthread_rwlock_unlock(&sem->lock);
70#endif
71}