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|
/*****************************************************************
|
| Neptune - Queue :: Posix Implementation
|
| (c) 2001-2002 Gilles Boccon-Gibod
| Author: Gilles Boccon-Gibod (bok@bok.net)
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#if defined(__SYMBIAN32__)
#include <stdio.h>
#endif
#include <pthread.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>
#include "NptConfig.h"
#include "NptTypes.h"
#include "NptQueue.h"
#include "NptThreads.h"
#include "NptList.h"
#include "NptLogging.h"
/*----------------------------------------------------------------------
| logging
+---------------------------------------------------------------------*/
NPT_SET_LOCAL_LOGGER("neptune.queue.posix")
/*----------------------------------------------------------------------
| NPT_PosixQueue
+---------------------------------------------------------------------*/
class NPT_PosixQueue : public NPT_GenericQueue
{
public:
// methods
NPT_PosixQueue(NPT_Cardinal max_items);
~NPT_PosixQueue() override;
NPT_Result Push(NPT_QueueItem* item, NPT_Timeout timeout) override;
NPT_Result Pop(NPT_QueueItem*& item, NPT_Timeout timeout) override;
NPT_Result Peek(NPT_QueueItem*& item, NPT_Timeout timeout) override;
private:
void Abort();
NPT_Result GetTimeOut(NPT_Timeout timeout, struct timespec& timed);
private:
// members
NPT_Cardinal m_MaxItems;
pthread_mutex_t m_Mutex;
pthread_cond_t m_CanPushCondition;
pthread_cond_t m_CanPopCondition;
NPT_Cardinal m_PushersWaitingCount;
NPT_Cardinal m_PoppersWaitingCount;
NPT_List<NPT_QueueItem*> m_Items;
bool m_Aborting;
};
/*----------------------------------------------------------------------
| NPT_PosixQueue::NPT_PosixQueue
+---------------------------------------------------------------------*/
NPT_PosixQueue::NPT_PosixQueue(NPT_Cardinal max_items) :
m_MaxItems(max_items),
m_PushersWaitingCount(0),
m_PoppersWaitingCount(0),
m_Aborting(false)
{
pthread_mutex_init(&m_Mutex, NULL);
pthread_cond_init(&m_CanPushCondition, NULL);
pthread_cond_init(&m_CanPopCondition, NULL);
}
/*----------------------------------------------------------------------
| NPT_PosixQueue::~NPT_PosixQueue()
+---------------------------------------------------------------------*/
NPT_PosixQueue::~NPT_PosixQueue()
{
Abort();
// destroy resources
pthread_cond_destroy(&m_CanPushCondition);
pthread_cond_destroy(&m_CanPopCondition);
pthread_mutex_destroy(&m_Mutex);
}
/*----------------------------------------------------------------------
| NPT_PosixQueue::Abort
+---------------------------------------------------------------------*/
void
NPT_PosixQueue::Abort()
{
pthread_cond_t abort_condition;
pthread_cond_init(&abort_condition, NULL);
struct timespec timed;
GetTimeOut(20, timed);
// acquire mutex
if (pthread_mutex_lock(&m_Mutex)) {
return;
}
// tell other threads that they should exit immediately
m_Aborting = true;
// notify clients
pthread_cond_broadcast(&m_CanPopCondition);
pthread_cond_broadcast(&m_CanPushCondition);
// wait for all waiters to exit
while (m_PoppersWaitingCount > 0 || m_PushersWaitingCount > 0) {
pthread_cond_timedwait(&abort_condition,
&m_Mutex,
&timed);
}
pthread_mutex_unlock(&m_Mutex);
}
/*----------------------------------------------------------------------
| NPT_PosixQueue::GetTimeOut
+---------------------------------------------------------------------*/
NPT_Result
NPT_PosixQueue::GetTimeOut(NPT_Timeout timeout, struct timespec& timed)
{
if (timeout != NPT_TIMEOUT_INFINITE) {
// get current time from system
struct timeval now;
if (gettimeofday(&now, NULL)) {
return NPT_FAILURE;
}
now.tv_usec += timeout * 1000;
if (now.tv_usec >= 1000000) {
now.tv_sec += now.tv_usec / 1000000;
now.tv_usec = now.tv_usec % 1000000;
}
// setup timeout
timed.tv_sec = now.tv_sec;
timed.tv_nsec = now.tv_usec * 1000;
}
return NPT_SUCCESS;
}
/*----------------------------------------------------------------------
| NPT_PosixQueue::Push
+---------------------------------------------------------------------*/
NPT_Result
NPT_PosixQueue::Push(NPT_QueueItem* item, NPT_Timeout timeout)
{
struct timespec timed;
if (timeout != NPT_TIMEOUT_INFINITE) {
NPT_CHECK(GetTimeOut(timeout, timed));
}
// lock the mutex that protects the list
if (pthread_mutex_lock(&m_Mutex)) {
return NPT_FAILURE;
}
NPT_Result result = NPT_SUCCESS;
// check that we have not exceeded the max
if (m_MaxItems) {
while (m_Items.GetItemCount() >= m_MaxItems) {
// wait until we can push
++m_PushersWaitingCount;
if (timeout == NPT_TIMEOUT_INFINITE) {
pthread_cond_wait(&m_CanPushCondition, &m_Mutex);
--m_PushersWaitingCount;
} else {
int wait_res = pthread_cond_timedwait(&m_CanPushCondition,
&m_Mutex,
&timed);
--m_PushersWaitingCount;
if (wait_res == ETIMEDOUT) {
result = NPT_ERROR_TIMEOUT;
break;
}
}
if (m_Aborting) {
result = NPT_ERROR_INTERRUPTED;
break;
}
}
}
// add the item to the list
if (result == NPT_SUCCESS) {
m_Items.Add(item);
// wake up any thread that may be waiting to pop
if (m_PoppersWaitingCount) {
pthread_cond_broadcast(&m_CanPopCondition);
}
}
// unlock the mutex
pthread_mutex_unlock(&m_Mutex);
return result;
}
/*----------------------------------------------------------------------
| NPT_PosixQueue::Pop
+---------------------------------------------------------------------*/
NPT_Result
NPT_PosixQueue::Pop(NPT_QueueItem*& item, NPT_Timeout timeout)
{
struct timespec timed;
if (timeout != NPT_TIMEOUT_INFINITE) {
NPT_CHECK(GetTimeOut(timeout, timed));
}
// lock the mutex that protects the list
if (pthread_mutex_lock(&m_Mutex)) {
return NPT_FAILURE;
}
NPT_Result result;
if (timeout) {
while ((result = m_Items.PopHead(item)) == NPT_ERROR_LIST_EMPTY) {
// no item in the list, wait for one
++m_PoppersWaitingCount;
if (timeout == NPT_TIMEOUT_INFINITE) {
pthread_cond_wait(&m_CanPopCondition, &m_Mutex);
--m_PoppersWaitingCount;
} else {
int wait_res = pthread_cond_timedwait(&m_CanPopCondition,
&m_Mutex,
&timed);
--m_PoppersWaitingCount;
if (wait_res == ETIMEDOUT) {
result = NPT_ERROR_TIMEOUT;
break;
}
}
if (m_Aborting) {
result = NPT_ERROR_INTERRUPTED;
break;
}
}
} else {
result = m_Items.PopHead(item);
}
// wake up any thread that my be waiting to push
if (m_MaxItems && (result == NPT_SUCCESS) && m_PushersWaitingCount) {
pthread_cond_broadcast(&m_CanPushCondition);
}
// unlock the mutex
pthread_mutex_unlock(&m_Mutex);
return result;
}
/*----------------------------------------------------------------------
| NPT_PosixQueue::Peek
+---------------------------------------------------------------------*/
NPT_Result
NPT_PosixQueue::Peek(NPT_QueueItem*& item, NPT_Timeout timeout)
{
struct timespec timed;
if (timeout != NPT_TIMEOUT_INFINITE) {
NPT_CHECK(GetTimeOut(timeout, timed));
}
// lock the mutex that protects the list
if (pthread_mutex_lock(&m_Mutex)) {
return NPT_FAILURE;
}
NPT_Result result = NPT_SUCCESS;
NPT_List<NPT_QueueItem*>::Iterator head = m_Items.GetFirstItem();
if (timeout) {
while (!head) {
// no item in the list, wait for one
++m_PoppersWaitingCount;
if (timeout == NPT_TIMEOUT_INFINITE) {
pthread_cond_wait(&m_CanPopCondition, &m_Mutex);
--m_PoppersWaitingCount;
} else {
int wait_res = pthread_cond_timedwait(&m_CanPopCondition,
&m_Mutex,
&timed);
--m_PoppersWaitingCount;
if (wait_res == ETIMEDOUT) {
result = NPT_ERROR_TIMEOUT;
break;
}
}
if (m_Aborting) {
result = NPT_ERROR_INTERRUPTED;
break;
}
head = m_Items.GetFirstItem();
}
} else {
if (!head) result = NPT_ERROR_LIST_EMPTY;
}
item = head?*head:NULL;
// unlock the mutex
pthread_mutex_unlock(&m_Mutex);
return result;
}
/*----------------------------------------------------------------------
| NPT_GenericQueue::CreateInstance
+---------------------------------------------------------------------*/
NPT_GenericQueue*
NPT_GenericQueue::CreateInstance(NPT_Cardinal max_items)
{
NPT_LOG_FINER_1("queue max_items = %d", (int)max_items);
return new NPT_PosixQueue(max_items);
}
|
