OVMS3/OVMS.V3/main/ovms_mutex.cpp

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/*
; Project: Open Vehicle Monitor System
; Date: 14th March 2017
;
; Changes:
; 1.0 Initial release
;
; (C) 2011 Michael Stegen / Stegen Electronics
; (C) 2011-2017 Mark Webb-Johnson
; (C) 2011 Sonny Chen @ EPRO/DX
;
; Permission is hereby granted, free of charge, to any person obtaining a copy
; of this software and associated documentation files (the "Software"), to deal
; in the Software without restriction, including without limitation the rights
; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
; copies of the Software, and to permit persons to whom the Software is
; furnished to do so, subject to the following conditions:
;
; The above copyright notice and this permission notice shall be included in
; all copies or substantial portions of the Software.
;
; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
; THE SOFTWARE.
*/
#include "ovms_log.h"
static const char *TAG = "mutex";
#include "ovms_mutex.h"
/**
* Standard Mutex:
*/
OvmsMutex::OvmsMutex()
{
m_mutex = xSemaphoreCreateMutex();
}
OvmsMutex::~OvmsMutex()
{
// Note: no concurrency protection here to keep this lightweight.
// If you need some, implement on application level.
TaskHandle_t holder = xSemaphoreGetMutexHolder(m_mutex);
if (holder == xTaskGetCurrentTaskHandle())
{
Unlock();
}
else if (holder)
{
ESP_LOGE(TAG, "attempt to delete an OvmsMutex still locked by %p => abort", holder);
abort();
}
vSemaphoreDelete(m_mutex);
}
bool OvmsMutex::Lock(TickType_t timeout)
{
return (xSemaphoreTake(m_mutex, timeout) == pdTRUE);
}
void OvmsMutex::Unlock()
{
xSemaphoreGive(m_mutex);
}
OvmsMutexLock::OvmsMutexLock(OvmsMutex* mutex, TickType_t timeout)
{
m_mutex = mutex;
m_locked = m_mutex->Lock(timeout);
}
OvmsMutexLock::~OvmsMutexLock()
{
if (m_locked) m_mutex->Unlock();
}
bool OvmsMutexLock::IsLocked()
{
return m_locked;
}
/**
* Recursive Mutex:
*/
OvmsRecMutex::OvmsRecMutex()
{
m_mutex = xSemaphoreCreateRecursiveMutex();
}
OvmsRecMutex::~OvmsRecMutex()
{
// Note: no concurrency protection here to keep this lightweight.
// If you need some, implement on application level.
TaskHandle_t holder, me = xTaskGetCurrentTaskHandle();
while ((holder = xSemaphoreGetMutexHolder(m_mutex)) != NULL)
{
if (holder == me)
{
Unlock();
}
else
{
ESP_LOGE(TAG, "attempt to delete an OvmsRecMutex still locked by %p => abort", holder);
abort();
}
}
vSemaphoreDelete(m_mutex);
}
bool OvmsRecMutex::Lock(TickType_t timeout)
{
return (xSemaphoreTakeRecursive(m_mutex, timeout) == pdTRUE);
}
void OvmsRecMutex::Unlock()
{
xSemaphoreGiveRecursive(m_mutex);
}
OvmsRecMutexLock::OvmsRecMutexLock(OvmsRecMutex* mutex, TickType_t timeout)
{
m_mutex = mutex;
m_locked = m_mutex->Lock(timeout);
}
OvmsRecMutexLock::~OvmsRecMutexLock()
{
if (m_locked) m_mutex->Unlock();
}
bool OvmsRecMutexLock::IsLocked()
{
return m_locked;
}