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/*
* MOST NetServices "Light" V3.2.7.0.1796 MultiInstance Patch
*
* Copyright (C) 2015 Microchip Technology Germany II GmbH & Co. KG
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* You may also obtain this software under a propriety license from Microchip.
* Please contact Microchip for further information.
*
*/
/*!
* \file
* \brief Implementation of the API locking manager.
*
* \cond MNS_INTERNAL_DOC
* \addtogroup G_ALM
* @{
*/
/*------------------------------------------------------------------------------------------------*/
/* Includes */
/*------------------------------------------------------------------------------------------------*/
#include "mns_alm.h"
#include "mns_misc.h"
/*------------------------------------------------------------------------------------------------*/
/* Internal constant */
/*------------------------------------------------------------------------------------------------*/
/*! \brief Interval for garbage collection */
static const uint16_t ALM_GARBAGE_COLLECTOR_INTERVAL = 2600U; /* parasoft-suppress MISRA2004-8_7 "Value shall be part of the module, not part of a function." */
/*------------------------------------------------------------------------------------------------*/
/* Internal prototypes */
/*------------------------------------------------------------------------------------------------*/
static void Alm_HandleInternalErrors(void *self, void *error_code_ptr);
static void Alm_GarbageCollector(void *self);
static bool Alm_CheckRegisteredApi(void *current_alm_ptr, void *alm_inst_ptr);
static void Alm_StartTimeout(CApiLockingManager *self);
static void Alm_ClearTimeout(CApiLockingManager *self);
static bool Alm_SearchLockedApi(void *current_alm_ptr, void *alm_inst_ptr);
static void Alm_ResetRegisteredApis(CApiLockingManager *self);
static bool Alm_ResetApi(void *current_alm_ptr, void *alm_inst_ptr);
/*------------------------------------------------------------------------------------------------*/
/* Implementation of class CApiLockingManager */
/*------------------------------------------------------------------------------------------------*/
/*! \brief Constructor of the API locking manager class.
* \param self Instance pointer
* \param tm_ptr Reference to timer management instance
* \param eh_ptr Reference to event handler instance
* \param mns_inst_id MOST NetServices instance ID
*/
void Alm_Ctor(CApiLockingManager *self,
CTimerManagement *tm_ptr,
CEventHandler *eh_ptr,
uint8_t mns_inst_id)
{
MISC_MEM_SET(self, 0, sizeof(*self));
T_Ctor(&self->garbage_collector);
self->tm_ptr = tm_ptr;
self->eh_ptr = eh_ptr;
self->mns_inst_id = mns_inst_id;
/* Observe internal errors and events */
Mobs_Ctor(&self->internal_error_obs, self, EH_M_TERMINATION_EVENTS, &Alm_HandleInternalErrors);
Eh_AddObsrvInternalEvent(self->eh_ptr, &self->internal_error_obs);
}
/*! \brief Handles internal errors and events
* \param self Instance pointer
* \param error_code_ptr Reference to reported error code
*/
static void Alm_HandleInternalErrors(void *self, void *error_code_ptr)
{
CApiLockingManager *self_ = (CApiLockingManager *)self;
MISC_UNUSED(error_code_ptr);
Tm_ClearTimer(self_->tm_ptr, &self_->garbage_collector); /* Clear timeout */
Alm_ResetRegisteredApis(self_); /* Reset all registered APIs */
}
/*! \brief Checks for API locking timeouts. This method is the callback function of timer
* \c garbage_collector.
* \param self Instance pointer
*/
static void Alm_GarbageCollector(void *self)
{
CApiLockingManager *self_ = (CApiLockingManager *)self;
(void)Dl_Foreach(&self_->api_list, &Alm_CheckRegisteredApi, self_);
}
/*! \brief This method is used by Alm_GarbageCollector() to process each registered API.
* \param current_alm_ptr Reference to the current API
* \param alm_inst_ptr Instance of the API locking manager
* \return \c false to process all registered APIs
*/
static bool Alm_CheckRegisteredApi(void *current_alm_ptr, void *alm_inst_ptr)
{
CApiLockingManager *self = (CApiLockingManager *)alm_inst_ptr;
CApiLocking *alm_ptr_ = (CApiLocking *)current_alm_ptr;
MISC_UNUSED(self);
if(alm_ptr_->timeout_mask != 0U)
{
Alm_ModuleMask_t tmp_mask = 1U;
while(alm_ptr_->timeout_mask != 0U)
{
if(tmp_mask == (tmp_mask & alm_ptr_->timeout_mask))
{
Ssub_Notify(&alm_ptr_->subject, &tmp_mask, false);
alm_ptr_->method_mask &= ~tmp_mask;
alm_ptr_->timeout_mask &= ~tmp_mask;
}
tmp_mask <<= 1;
}
Alm_ClearTimeout(self);
}
if(alm_ptr_->method_mask != 0U)
{
alm_ptr_->timeout_mask = alm_ptr_->method_mask;
}
return false;
}
/*! \brief Registers a new API locking object.
* \param self Instance pointer
* \param al_ptr Reference to the API to register
*/
void Alm_RegisterApi(CApiLockingManager *self, CApiLocking *al_ptr)
{
Dl_InsertTail(&self->api_list, &al_ptr->node);
Dln_SetData(&al_ptr->node, al_ptr);
al_ptr->alm_ptr = self;
}
/*! \brief Starts the garbage collecting timer.
* \param self Instance pointer
*/
static void Alm_StartTimeout(CApiLockingManager *self)
{
if(T_IsTimerInUse(&self->garbage_collector) == false)
{
Tm_SetTimer(self->tm_ptr,
&self->garbage_collector,
&Alm_GarbageCollector,
self,
ALM_GARBAGE_COLLECTOR_INTERVAL,
ALM_GARBAGE_COLLECTOR_INTERVAL);
}
}
/*! \brief Clears the garbage collecting timer. The timer is clear if no API locking flag is
* currently pending.
* \param self Instance pointer
*/
static void Alm_ClearTimeout(CApiLockingManager *self)
{
if(NULL == Dl_Foreach(&self->api_list, &Alm_SearchLockedApi, self))
{
Tm_ClearTimer(self->tm_ptr, &self->garbage_collector);
}
}
/*! \brief Used by Alm_ClearTimeout() to check if at least one registered API is locked.
* \param current_alm_ptr Reference to the current API locking object
* \param alm_inst_ptr Instance of the API locking manager
* \return \c true if a locked API was found, otherwise \c false
*/
static bool Alm_SearchLockedApi(void *current_alm_ptr, void *alm_inst_ptr)
{
CApiLocking *alm_ptr_ = (CApiLocking *)current_alm_ptr;
bool ret_val = false;
MISC_UNUSED(alm_inst_ptr);
if(alm_ptr_->method_mask != 0U)
{
ret_val = true;
}
return ret_val;
}
/*! \brief Resets all registered APIs. Called if an internal error has been occurred.
* \param self Instance pointer
*/
static void Alm_ResetRegisteredApis(CApiLockingManager *self)
{
(void)Dl_Foreach(&self->api_list, &Alm_ResetApi, self);
}
/*! \brief Used by Alm_ResetRegisteredApis() to reset all registered APIs.
* \param current_alm_ptr Reference to the current API locking object
* \param alm_inst_ptr Instance of the API locking manager
* \return \c false (process all registered APIs)
*/
static bool Alm_ResetApi(void *current_alm_ptr, void *alm_inst_ptr)
{
CApiLocking *alm_ptr_ = (CApiLocking *)current_alm_ptr;
MISC_UNUSED(alm_inst_ptr);
alm_ptr_->method_mask = 0U;
alm_ptr_->timeout_mask = 0U;
return false;
}
/*------------------------------------------------------------------------------------------------*/
/* Implementation of class CApiLocking */
/*------------------------------------------------------------------------------------------------*/
/*! \brief Constructor of the API locking class.
* \param self Instance pointer
* \param obs_ptr Observer to signal locked API methods
* \param mns_inst_id MOST NetServices instance ID
*/
void Al_Ctor(CApiLocking *self, CSingleObserver *obs_ptr, uint8_t mns_inst_id)
{
MISC_MEM_SET(self, 0, sizeof(*self));
self->mns_inst_id = mns_inst_id;
Dln_Ctor(&self->node, NULL);
if(obs_ptr != NULL)
{
Ssub_Ctor(&self->subject, self->mns_inst_id);
(void)Ssub_AddObserver(&self->subject, obs_ptr);
}
}
/*! \brief Locks the given API method.
* \param self Instance pointer
* \param method Bitmask of method to lock
* \return \c true if the API has been locked successfully
* \return \c false if the API was already locked
*/
bool Al_Lock(CApiLocking *self, Alm_ModuleMask_t method)
{
bool ret_val = false;
if((self->method_mask & method) == 0U)
{
ret_val = true;
self->method_mask |= method;
self->timeout_mask &= ~method;
Alm_StartTimeout(self->alm_ptr);
}
return ret_val;
}
/*! \brief Releases the lock of the given API method.
* \param self Instance pointer
* \param method Bitmask of method to lock
*/
void Al_Release(CApiLocking *self, Alm_ModuleMask_t method)
{
self->method_mask &= ~method;
self->timeout_mask &= ~method;
Alm_ClearTimeout(self->alm_ptr);
}
/*!
* @}
* \endcond
*/
/*------------------------------------------------------------------------------------------------*/
/* End of file */
/*------------------------------------------------------------------------------------------------*/
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