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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-07-25 Shell first version
* 2023-11-25 Shell Add pgrp, session lock API
*/
#define DBG_TAG "lwp.internal"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <stdlib.h>
#include "lwp_internal.h"
static rt_err_t _mutex_take_safe(rt_mutex_t mtx, rt_int32_t timeout, int flags)
{
LWP_DEF_RETURN_CODE(rc);
int retry;
rt_int32_t effect_timeout;
#ifdef LWP_DEBUG
rt_thread_t thread = rt_thread_self();
#endif
if (mtx)
{
effect_timeout = timeout;
#if DBG_LVL == DBG_LOG && defined(LWP_DEBUG)
int exception;
rt_list_t *node = RT_NULL;
struct rt_mutex *tak_obj = RT_NULL;
if (!rt_list_isempty(&(thread->taken_object_list)) && timeout == RT_WAITING_FOREVER)
{
exception = 1;
effect_timeout = 0;
}
else
{
exception = 0;
}
#endif /* DBG_LOG && defined(LWP_DEBUG) */
do {
retry = 0;
if (flags & LWP_MTX_FLAGS_INTR)
rc = rt_mutex_take_interruptible(mtx, effect_timeout);
else
rc = rt_mutex_take_killable(mtx, effect_timeout);
#ifdef LWP_DEBUG
if (rc == RT_EOK)
{
if (!(flags & LWP_MTX_FALGS_NESTED) && rt_mutex_get_hold(mtx) > 1)
{
LOG_W("Already hold the lock");
rt_backtrace();
}
}
else if (rc == -RT_ETIMEOUT)
{
#if DBG_LVL == DBG_LOG
if (exception)
{
rt_list_for_each(node, &(thread->taken_object_list))
{
tak_obj = rt_list_entry(node, struct rt_mutex, taken_list);
if (rt_mutex_get_owner(tak_obj)->stat & RT_THREAD_SUSPEND_MASK)
LOG_D("Potential dead lock - Taken: %s, Try take: %s",
tak_obj->parent.parent.name, mtx->parent.parent.name);
}
rt_backtrace();
retry = 1;
exception = 0;
}
#endif
}
else if (rc != -RT_EINTR)
{
char tname[RT_NAME_MAX];
rt_thread_get_name(thread, tname, sizeof(tname));
LOG_W("Possible kernel corruption detected on thread %s with errno %ld", tname, rc);
}
#endif /* LWP_DEBUG */
} while (retry);
}
else
{
rc = -RT_ERROR;
LOG_W("%s: mtx should not be NULL", __func__);
RT_ASSERT(0);
}
LWP_RETURN(rc);
}
rt_err_t lwp_mutex_take_safe(rt_mutex_t mtx, rt_int32_t timeout, int flags)
{
LWP_DEF_RETURN_CODE(rc);
rc = _mutex_take_safe(mtx, timeout, flags);
LWP_RETURN(rc);
}
rt_err_t lwp_mutex_release_safe(rt_mutex_t mtx)
{
LWP_DEF_RETURN_CODE(rc);
rc = rt_mutex_release(mtx);
if (rc)
{
LOG_I("%s: release failed with code %ld", __func__, rc);
rt_backtrace();
}
LWP_RETURN(rc);
}
rt_err_t lwp_critical_enter(struct rt_lwp *lwp, int flags)
{
rt_err_t rc;
do {
rc = lwp_mutex_take_safe(&lwp->lwp_lock, RT_WAITING_FOREVER, flags);
} while (rc != RT_EOK && !(flags & LWP_MTX_FLAGS_INTR) && rc == -RT_EINTR);
/* if current process is force killed */
if (rc != RT_EOK && rc != -RT_EINTR)
{
LOG_I("%s: unexpected return code = %ld", __func__, rc);
}
return rc;
}
rt_err_t lwp_critical_exit(struct rt_lwp *lwp)
{
return lwp_mutex_release_safe(&lwp->lwp_lock);
}
rt_err_t lwp_pgrp_critical_enter(struct rt_processgroup *pgrp, int flags)
{
rt_err_t rc;
do {
rc = lwp_mutex_take_safe(&pgrp->mutex, RT_WAITING_FOREVER, flags);
} while (rc != RT_EOK && !(flags & LWP_MTX_FLAGS_INTR) && rc == -RT_EINTR);
/* if current process is force killed */
if (rc != RT_EOK && rc != -RT_EINTR)
{
LOG_I("%s: unexpected return code = %ld", __func__, rc);
}
return rc;
}
rt_err_t lwp_pgrp_critical_exit(struct rt_processgroup *pgrp)
{
return lwp_mutex_release_safe(&pgrp->mutex);
}
rt_err_t lwp_sess_critical_enter(struct rt_session *sess, int flags)
{
rt_err_t rc;
do {
rc = lwp_mutex_take_safe(&sess->mutex, RT_WAITING_FOREVER, flags);
} while (rc != RT_EOK && !(flags & LWP_MTX_FLAGS_INTR) && rc == -RT_EINTR);
/* if current process is force killed */
if (rc != RT_EOK && rc != -RT_EINTR)
{
LOG_I("%s: unexpected return code = %ld", __func__, rc);
}
return rc;
}
rt_err_t lwp_sess_critical_exit(struct rt_session *sess)
{
return lwp_mutex_release_safe(&sess->mutex);
}
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