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IPCQueueStub.cpp
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IPCQueueStub.cpp
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// ======================================================================
// \title Queue.cpp
// \author dinkel
// \brief Queue implementation using the pthread library. This is NOT
// an IPC queue. It is meant to be used between threads within
// the same address space.
//
// \copyright
// Copyright 2009-2015, by the California Institute of Technology.
// ALL RIGHTS RESERVED. United States Government Sponsorship
// acknowledged.
//
// ======================================================================
#include <Os/Pthreads/BufferQueue.hpp>
#include <Fw/Types/Assert.hpp>
#include <Os/IPCQueue.hpp>
#include <cerrno>
#include <pthread.h>
#include <cstdio>
#include <new>
namespace Os {
// A helper class which stores variables for the queue handle.
// The queue itself, a pthread condition variable, and pthread
// mutex are contained within this container class.
class QueueHandle {
public:
QueueHandle() {
int ret;
ret = pthread_cond_init(&this->queueNotEmpty, nullptr);
FW_ASSERT(ret == 0, ret); // If this fails, something horrible happened.
ret = pthread_cond_init(&this->queueNotFull, nullptr);
FW_ASSERT(ret == 0, ret); // If this fails, something horrible happened.
ret = pthread_mutex_init(&this->queueLock, nullptr);
FW_ASSERT(ret == 0, ret); // If this fails, something horrible happened.
}
~QueueHandle() {
(void) pthread_cond_destroy(&this->queueNotEmpty);
(void) pthread_cond_destroy(&this->queueNotFull);
(void) pthread_mutex_destroy(&this->queueLock);
}
bool create(NATIVE_INT_TYPE depth, NATIVE_INT_TYPE msgSize) {
return queue.create(static_cast<NATIVE_UINT_TYPE>(depth), static_cast<NATIVE_UINT_TYPE>(msgSize));
}
BufferQueue queue;
pthread_cond_t queueNotEmpty;
pthread_cond_t queueNotFull;
pthread_mutex_t queueLock;
};
IPCQueue::IPCQueue() : Queue() {
}
Queue::QueueStatus IPCQueue::create(const Fw::StringBase &name, NATIVE_INT_TYPE depth, NATIVE_INT_TYPE msgSize) {
QueueHandle* queueHandle = reinterpret_cast<QueueHandle*>(this->m_handle);
// Queue has already been created... remove it and try again:
if (nullptr != queueHandle) {
delete queueHandle;
queueHandle = nullptr;
}
// Create queue handle:
queueHandle = new(std::nothrow) QueueHandle;
if (nullptr == queueHandle) {
return QUEUE_UNINITIALIZED;
}
if( !queueHandle->create(depth, msgSize) ) {
return QUEUE_UNINITIALIZED;
}
this->m_handle = reinterpret_cast<POINTER_CAST>(queueHandle);
#if FW_QUEUE_REGISTRATION
if (this->s_queueRegistry) {
this->s_queueRegistry->regQueue(this);
}
#endif
return QUEUE_OK;
}
IPCQueue::~IPCQueue() {
// Clean up the queue handle:
QueueHandle* queueHandle = reinterpret_cast<QueueHandle*>(this->m_handle);
if (nullptr != queueHandle) {
delete queueHandle;
}
this->m_handle = reinterpret_cast<POINTER_CAST>(nullptr);
}
Queue::QueueStatus sendNonBlockIPCStub(QueueHandle* queueHandle, const U8* buffer, NATIVE_INT_TYPE size, NATIVE_INT_TYPE priority) {
BufferQueue* queue = &queueHandle->queue;
pthread_cond_t* queueNotEmpty = &queueHandle->queueNotEmpty;
pthread_mutex_t* queueLock = &queueHandle->queueLock;
NATIVE_INT_TYPE ret;
Queue::QueueStatus status = Queue::QUEUE_OK;
////////////////////////////////
// Locked Section
///////////////////////////////
ret = pthread_mutex_lock(queueLock);
FW_ASSERT(ret == 0, errno);
///////////////////////////////
// Push item onto queue:
bool pushSucceeded = queue->push(buffer, static_cast<NATIVE_UINT_TYPE>(size), priority);
if(pushSucceeded) {
// Push worked - wake up a thread that might be waiting on
// the other end of the queue:
ret = pthread_cond_signal(queueNotEmpty);
FW_ASSERT(ret == 0, errno); // If this fails, something horrible happened.
}
else {
// Push failed - the queue is full:
status = Queue::QUEUE_FULL;
}
///////////////////////////////
ret = pthread_mutex_unlock(queueLock);
FW_ASSERT(ret == 0, errno);
////////////////////////////////
///////////////////////////////
return status;
}
Queue::QueueStatus sendBlockIPCStub(QueueHandle* queueHandle, const U8* buffer, NATIVE_INT_TYPE size, NATIVE_INT_TYPE priority) {
BufferQueue* queue = &queueHandle->queue;
pthread_cond_t* queueNotEmpty = &queueHandle->queueNotEmpty;
pthread_cond_t* queueNotFull = &queueHandle->queueNotFull;
pthread_mutex_t* queueLock = &queueHandle->queueLock;
NATIVE_INT_TYPE ret;
////////////////////////////////
// Locked Section
///////////////////////////////
ret = pthread_mutex_lock(queueLock);
FW_ASSERT(ret == 0, errno);
///////////////////////////////
// If the queue is full, wait until a message is taken off the queue:
while( queue->isFull() ) {
ret = pthread_cond_wait(queueNotFull, queueLock);
FW_ASSERT(ret == 0, errno);
}
// Push item onto queue:
bool pushSucceeded = queue->push(buffer, static_cast<NATIVE_UINT_TYPE>(size), priority);
// The only reason push would not succeed is if the queue
// was full. Since we waited for the queue to NOT be full
// before sending on the queue, the push must have succeeded
// unless there was a programming error or a bit flip.
FW_ASSERT(pushSucceeded, pushSucceeded);
// Push worked - wake up a thread that might be waiting on
// the other end of the queue:
ret = pthread_cond_signal(queueNotEmpty);
FW_ASSERT(ret == 0, errno); // If this fails, something horrible happened.
///////////////////////////////
ret = pthread_mutex_unlock(queueLock);
FW_ASSERT(ret == 0, errno);
////////////////////////////////
///////////////////////////////
return Queue::QUEUE_OK;
}
Queue::QueueStatus IPCQueue::send(const U8* buffer, NATIVE_INT_TYPE size, NATIVE_INT_TYPE priority, QueueBlocking block) {
(void) block; // Always non-blocking for now
QueueHandle* queueHandle = reinterpret_cast<QueueHandle*>(this->m_handle);
BufferQueue* queue = &queueHandle->queue;
if (nullptr == queueHandle) {
return QUEUE_UNINITIALIZED;
}
if (nullptr == buffer) {
return QUEUE_EMPTY_BUFFER;
}
if (size < 0 || static_cast<NATIVE_UINT_TYPE>(size) > queue->getMsgSize()) {
return QUEUE_SIZE_MISMATCH;
}
if( QUEUE_NONBLOCKING == block ) {
return sendNonBlockIPCStub(queueHandle, buffer, size, priority);
}
return sendBlockIPCStub(queueHandle, buffer, size, priority);
}
Queue::QueueStatus receiveNonBlockIPCStub(QueueHandle* queueHandle, U8* buffer, NATIVE_INT_TYPE capacity, NATIVE_INT_TYPE &actualSize, NATIVE_INT_TYPE &priority) {
BufferQueue* queue = &queueHandle->queue;
pthread_mutex_t* queueLock = &queueHandle->queueLock;
pthread_cond_t* queueNotFull = &queueHandle->queueNotFull;
NATIVE_INT_TYPE ret;
NATIVE_UINT_TYPE size = static_cast<NATIVE_UINT_TYPE>(capacity);
NATIVE_INT_TYPE pri = 0;
Queue::QueueStatus status = Queue::QUEUE_OK;
////////////////////////////////
// Locked Section
///////////////////////////////
ret = pthread_mutex_lock(queueLock);
FW_ASSERT(ret == 0, errno);
///////////////////////////////
// Get an item off of the queue:
bool popSucceeded = queue->pop(buffer, size, pri);
if(popSucceeded) {
// Pop worked - set the return size and priority:
actualSize = static_cast<NATIVE_INT_TYPE>(size);
priority = pri;
// Pop worked - wake up a thread that might be waiting on
// the send end of the queue:
ret = pthread_cond_signal(queueNotFull);
FW_ASSERT(ret == 0, errno); // If this fails, something horrible happened.
}
else {
actualSize = 0;
if( size > static_cast<NATIVE_UINT_TYPE>(capacity) ) {
// The buffer capacity was too small!
status = Queue::QUEUE_SIZE_MISMATCH;
}
else if( size == 0 ) {
// The queue is empty:
status = Queue::QUEUE_NO_MORE_MSGS;
}
else {
// If this happens, a programming error or bit flip occurred:
FW_ASSERT(0);
}
}
///////////////////////////////
ret = pthread_mutex_unlock(queueLock);
FW_ASSERT(ret == 0, errno);
////////////////////////////////
///////////////////////////////
return status;
}
Queue::QueueStatus receiveBlockIPCStub(QueueHandle* queueHandle, U8* buffer, NATIVE_INT_TYPE capacity, NATIVE_INT_TYPE &actualSize, NATIVE_INT_TYPE &priority) {
BufferQueue* queue = &queueHandle->queue;
pthread_cond_t* queueNotEmpty = &queueHandle->queueNotEmpty;
pthread_cond_t* queueNotFull = &queueHandle->queueNotFull;
pthread_mutex_t* queueLock = &queueHandle->queueLock;
NATIVE_INT_TYPE ret;
NATIVE_UINT_TYPE size = static_cast<NATIVE_UINT_TYPE>(capacity);
NATIVE_INT_TYPE pri = 0;
Queue::QueueStatus status = Queue::QUEUE_OK;
////////////////////////////////
// Locked Section
///////////////////////////////
ret = pthread_mutex_lock(queueLock);
FW_ASSERT(ret == 0, errno);
///////////////////////////////
// If the queue is empty, wait until a message is put on the queue:
while( queue->isEmpty() ) {
ret = pthread_cond_wait(queueNotEmpty, queueLock);
FW_ASSERT(ret == 0, errno);
}
// Get an item off of the queue:
bool popSucceeded = queue->pop(buffer, size, pri);
if(popSucceeded) {
// Pop worked - set the return size and priority:
actualSize = static_cast<NATIVE_INT_TYPE>(size);
priority = pri;
// Pop worked - wake up a thread that might be waiting on
// the send end of the queue:
ret = pthread_cond_signal(queueNotFull);
FW_ASSERT(ret == 0, errno); // If this fails, something horrible happened.
}
else {
actualSize = 0;
if( size > static_cast<NATIVE_UINT_TYPE>(capacity) ) {
// The buffer capacity was too small!
status = Queue::QUEUE_SIZE_MISMATCH;
}
else {
// If this happens, a programming error or bit flip occurred:
// The only reason a pop should fail is if the user's buffer
// was too small.
FW_ASSERT(0);
}
}
///////////////////////////////
ret = pthread_mutex_unlock(queueLock);
FW_ASSERT(ret == 0, errno);
////////////////////////////////
///////////////////////////////
return status;
}
Queue::QueueStatus IPCQueue::receive(U8* buffer, NATIVE_INT_TYPE capacity, NATIVE_INT_TYPE &actualSize, NATIVE_INT_TYPE &priority, QueueBlocking block) {
if( reinterpret_cast<POINTER_CAST>(nullptr) == this->m_handle ) {
return QUEUE_UNINITIALIZED;
}
QueueHandle* queueHandle = reinterpret_cast<QueueHandle*>(this->m_handle);
if (nullptr == queueHandle) {
return QUEUE_UNINITIALIZED;
}
// Do not need to check the upper bound of capacity, We don't care
// how big the user's buffer is.. as long as it's big enough.
if (capacity < 0) {
return QUEUE_SIZE_MISMATCH;
}
if( QUEUE_NONBLOCKING == block ) {
return receiveNonBlockIPCStub(queueHandle, buffer, capacity, actualSize, priority);
}
return receiveBlockIPCStub(queueHandle, buffer, capacity, actualSize, priority);
}
NATIVE_INT_TYPE IPCQueue::getNumMsgs() const {
QueueHandle* queueHandle = reinterpret_cast<QueueHandle*>(this->m_handle);
if (nullptr == queueHandle) {
return 0;
}
BufferQueue* queue = &queueHandle->queue;
return static_cast<NATIVE_INT_TYPE>(queue->getCount());
}
NATIVE_INT_TYPE IPCQueue::getMaxMsgs() const {
QueueHandle* queueHandle = reinterpret_cast<QueueHandle*>(this->m_handle);
if (nullptr == queueHandle) {
return 0;
}
BufferQueue* queue = &queueHandle->queue;
return static_cast<NATIVE_INT_TYPE>(queue->getMaxCount());
}
NATIVE_INT_TYPE IPCQueue::getQueueSize() const {
QueueHandle* queueHandle = reinterpret_cast<QueueHandle*>(this->m_handle);
if (nullptr == queueHandle) {
return 0;
}
BufferQueue* queue = &queueHandle->queue;
return static_cast<NATIVE_INT_TYPE>(queue->getDepth());
}
NATIVE_INT_TYPE IPCQueue::getMsgSize() const {
QueueHandle* queueHandle = reinterpret_cast<QueueHandle*>(this->m_handle);
if (nullptr == queueHandle) {
return 0;
}
BufferQueue* queue = &queueHandle->queue;
return static_cast<NATIVE_INT_TYPE>(queue->getMsgSize());
}
}