Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
#include "util.h"
#include "rwsem.h"
 
int init_rwsem(struct rw_semaphore *sem)
{
<------>return pthread_rwlock_init(&sem->lock, NULL);
}
 
int exit_rwsem(struct rw_semaphore *sem)
{
<------>return pthread_rwlock_destroy(&sem->lock);
}
 
int down_read(struct rw_semaphore *sem)
{
<------>return perf_singlethreaded ? 0 : pthread_rwlock_rdlock(&sem->lock);
}
 
int up_read(struct rw_semaphore *sem)
{
<------>return perf_singlethreaded ? 0 : pthread_rwlock_unlock(&sem->lock);
}
 
int down_write(struct rw_semaphore *sem)
{
<------>return perf_singlethreaded ? 0 : pthread_rwlock_wrlock(&sem->lock);
}
 
int up_write(struct rw_semaphore *sem)
{
<------>return perf_singlethreaded ? 0 : pthread_rwlock_unlock(&sem->lock);
}