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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-04-27 flybreak the first version.
*/
#include <arm-tpl.h>
#include <cstdint>
#include <stdatomic.h>
#include "tpl.h"
static int check_create(volatile __ARM_TPL_mutex_t *__vm, bool recursive = false)
{
if (__vm->data == 0)
{
uintptr_t mut_null = 0;
arm_tpl_mutex_struct *mutex_p = (arm_tpl_mutex_struct *)rt_malloc(sizeof(arm_tpl_mutex_struct));
if (mutex_p == nullptr) return -1;
if (recursive)
mutex_p->mutex = rt_mutex_create("mutexx", RT_IPC_FLAG_PRIO);
else
mutex_p->mutex = rt_mutex_create("mutexx", RT_IPC_FLAG_PRIO);
if (mutex_p->mutex == nullptr)
{
rt_free(mutex_p);
return -1;
}
mutex_p->type = recursive ? RECURSIVE : NORMAL;
uintptr_t mut_new = reinterpret_cast<uintptr_t>(mutex_p);
if (!atomic_compare_exchange_strong(&__vm->data, &mut_null, mut_new))
{
rt_mutex_delete(mutex_p->mutex);
rt_free(mutex_p);
}
}
return 0;
}
static int mutexLock(arm_tpl_mutex_struct *mutex_p, rt_tick_t timeOut)
{
if (mutex_p->type == RECURSIVE)
{
if (rt_mutex_take(mutex_p->mutex, timeOut) == 0)
return 0;
}
else
{
if (rt_mutex_take(mutex_p->mutex, timeOut) == 0)
return 0;
}
return -1;
}
static int mutexUnlock(arm_tpl_mutex_struct *mutex_p)
{
if (mutex_p->type == RECURSIVE)
rt_mutex_release(mutex_p->mutex);
else
rt_mutex_release(mutex_p->mutex);
return 0;
}
extern "C" int __ARM_TPL_recursive_mutex_init(__ARM_TPL_mutex_t *__m)
{
volatile __ARM_TPL_mutex_t *__vm = __m;
return check_create(__vm, true);
}
extern "C" int __ARM_TPL_mutex_lock(__ARM_TPL_mutex_t *__m)
{
volatile __ARM_TPL_mutex_t *__vm = __m;
if (check_create(__vm))
return -1;
while (mutexLock((arm_tpl_mutex_struct *)(__vm->data), ARM_TPL_MAX_DELAY) != 0);
return 0;
}
extern "C" int __ARM_TPL_mutex_trylock(__ARM_TPL_mutex_t *__m)
{
volatile __ARM_TPL_mutex_t *__vm = __m;
if (check_create(__vm))
return -1;
return mutexLock((arm_tpl_mutex_struct *)(__vm->data), 0);
}
extern "C" int __ARM_TPL_mutex_unlock(__ARM_TPL_mutex_t *__m)
{
volatile __ARM_TPL_mutex_t *__vm = __m;
return mutexUnlock((arm_tpl_mutex_struct *)(__vm->data));
}
extern "C" int __ARM_TPL_mutex_destroy(__ARM_TPL_mutex_t *__m)
{
volatile __ARM_TPL_mutex_t *__vm = __m;
if (__vm->data != 0)
{
rt_mutex_delete(((arm_tpl_mutex_struct *)(__vm->data))->mutex);
rt_free((void *)(__vm->data));
__vm->data = 0;
}
return 0;
}
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