206 lines
3.3 KiB
C
206 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 2017 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <kernel.h>
|
|
#include <ksched.h>
|
|
#include <wait_q.h>
|
|
#include <posix/pthread.h>
|
|
|
|
#define MUTEX_MAX_REC_LOCK 32767
|
|
|
|
/*
|
|
* Default mutex attrs.
|
|
*/
|
|
static const pthread_mutexattr_t def_attr = {
|
|
.type = PTHREAD_MUTEX_DEFAULT,
|
|
};
|
|
|
|
static int acquire_mutex(pthread_mutex_t *m, int timeout)
|
|
{
|
|
int rc = 0, key = irq_lock();
|
|
|
|
if (m->lock_count == 0 && m->owner == NULL) {
|
|
m->lock_count++;
|
|
m->owner = pthread_self();
|
|
|
|
irq_unlock(key);
|
|
return 0;
|
|
} else if (m->owner == pthread_self()) {
|
|
if (m->type == PTHREAD_MUTEX_RECURSIVE &&
|
|
m->lock_count < MUTEX_MAX_REC_LOCK) {
|
|
m->lock_count++;
|
|
rc = 0;
|
|
} else if (m->type == PTHREAD_MUTEX_ERRORCHECK) {
|
|
rc = EDEADLK;
|
|
} else {
|
|
rc = EINVAL;
|
|
}
|
|
|
|
irq_unlock(key);
|
|
return rc;
|
|
}
|
|
|
|
if (timeout == K_NO_WAIT) {
|
|
irq_unlock(key);
|
|
return EINVAL;
|
|
}
|
|
|
|
rc = _pend_current_thread(key, &m->wait_q, timeout);
|
|
if (rc != 0) {
|
|
rc = ETIMEDOUT;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* @brief Lock POSIX mutex with non-blocking call.
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutex_trylock(pthread_mutex_t *m)
|
|
{
|
|
return acquire_mutex(m, K_NO_WAIT);
|
|
}
|
|
|
|
/**
|
|
* @brief Lock POSIX mutex with timeout.
|
|
*
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutex_timedlock(pthread_mutex_t *m,
|
|
const struct timespec *to)
|
|
{
|
|
return acquire_mutex(m, _ts_to_ms(to));
|
|
}
|
|
|
|
/**
|
|
* @brief Intialize POSIX mutex.
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutex_init(pthread_mutex_t *m,
|
|
const pthread_mutexattr_t *attr)
|
|
{
|
|
const pthread_mutexattr_t *mattr;
|
|
|
|
m->owner = NULL;
|
|
m->lock_count = 0;
|
|
|
|
mattr = (attr == NULL) ? &def_attr : attr;
|
|
|
|
m->type = mattr->type;
|
|
|
|
_waitq_init(&m->wait_q);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief Lock POSIX mutex with blocking call.
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutex_lock(pthread_mutex_t *m)
|
|
{
|
|
return acquire_mutex(m, K_FOREVER);
|
|
}
|
|
|
|
/**
|
|
* @brief Unlock POSIX mutex.
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutex_unlock(pthread_mutex_t *m)
|
|
{
|
|
unsigned int key = irq_lock();
|
|
|
|
k_tid_t thread;
|
|
|
|
if (m->owner != pthread_self()) {
|
|
irq_unlock(key);
|
|
return EPERM;
|
|
}
|
|
|
|
if (m->lock_count == 0) {
|
|
irq_unlock(key);
|
|
return EINVAL;
|
|
}
|
|
|
|
m->lock_count--;
|
|
|
|
if (m->lock_count == 0) {
|
|
thread = _unpend_first_thread(&m->wait_q);
|
|
if (thread) {
|
|
m->owner = (pthread_t)thread;
|
|
m->lock_count++;
|
|
_ready_thread(thread);
|
|
_set_thread_return_value(thread, 0);
|
|
_reschedule(key);
|
|
return 0;
|
|
}
|
|
m->owner = NULL;
|
|
|
|
}
|
|
irq_unlock(key);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Destroy POSIX mutex.
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutex_destroy(pthread_mutex_t *m)
|
|
{
|
|
ARG_UNUSED(m);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Read protocol attribute for mutex.
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutexattr_getprotocol(const pthread_mutexattr_t *attr,
|
|
int *protocol)
|
|
{
|
|
*protocol = PTHREAD_PRIO_NONE;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Read type attribute for mutex.
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutexattr_gettype(const pthread_mutexattr_t *attr, int *type)
|
|
{
|
|
*type = attr->type;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Set type attribute for mutex.
|
|
*
|
|
* See IEEE 1003.1
|
|
*/
|
|
int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int type)
|
|
{
|
|
int retc = EINVAL;
|
|
|
|
if ((type == PTHREAD_MUTEX_NORMAL) ||
|
|
(type == PTHREAD_MUTEX_RECURSIVE) ||
|
|
(type == PTHREAD_MUTEX_ERRORCHECK)) {
|
|
attr->type = type;
|
|
retc = 0;
|
|
}
|
|
|
|
return retc;
|
|
}
|