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/**************************************************************************
*** COPYRIGHT (c) 2002 by TransNexus, Inc. ***
*** ***
*** This software is property of TransNexus, Inc. ***
*** This software is freely available under license from TransNexus. ***
*** The license terms and conditions for free use of this software by ***
*** third parties are defined in the OSP Toolkit Software License ***
*** Agreement (LICENSE.txt). Any use of this software by third ***
*** parties, which does not comply with the terms and conditions of the ***
*** OSP Toolkit Software License Agreement is prohibited without ***
*** the prior, express, written consent of TransNexus, Inc. ***
*** ***
*** Thank you for using the OSP ToolKit(TM). Please report any bugs, ***
*** suggestions or feedback to support@transnexus.com ***
*** ***
**************************************************************************/
/*
* syncque.cpp - SyncQueue object funcions.
*/
#include "syncque.h"
static int SyncQueueInitSync(SYNCQUEUE *);
void SyncQueueIncrementNumberOfTransactions(SYNCQUEUE *);
void SyncQueueDecrementNumberOfTransactions(SYNCQUEUE *);
/*
* Private API
*/
static int SyncQueueInitSync(SYNCQUEUE *syncQueue)
{
int errorcode = OSPC_ERR_NO_ERROR, tmperror = OSPC_ERR_NO_ERROR;
OSPM_MUTEX_INIT(syncQueue->Mutex, OSPC_OSNULL, errorcode);
if (errorcode == OSPC_ERR_NO_ERROR) {
OSPM_CONDVAR_INIT(syncQueue->CondVarNotEmpty, OSPC_OSNULL, errorcode);
if (errorcode == OSPC_ERR_NO_ERROR) {
OSPM_CONDVAR_INIT(syncQueue->CondVarEmpty, OSPC_OSNULL, errorcode);
}
if (errorcode != OSPC_ERR_NO_ERROR) {
OSPM_MUTEX_DESTROY(syncQueue->Mutex, tmperror);
}
}
return errorcode;
}
void SyncQueueIncrementNumberOfTransactions(SYNCQUEUE *syncQueue)
{
syncQueue->NumberOfTransactions++;
}
void SyncQueueDecrementNumberOfTransactions(SYNCQUEUE *syncQueue)
{
syncQueue->NumberOfTransactions--;
}
/*
* Public API
*/
int SyncQueueNew(SYNCQUEUE **syncQueue)
{
int errorcode = OSPC_ERR_NO_ERROR;
OSPM_MALLOC(*syncQueue, SYNCQUEUE, sizeof(SYNCQUEUE));
if (*syncQueue != OSPC_OSNULL) {
OSPM_MEMSET(*syncQueue, 0, sizeof(SYNCQUEUE));
(*syncQueue)->NumberOfTransactions = 0;
/*
* initialize the mutex and conditional variable for the message queue
*/
errorcode = SyncQueueInitSync(*syncQueue);
/*
* initialize the list used to hold message info structures (items)
*/
OSPPListNew(&((*syncQueue)->PayloadList));
if (errorcode != OSPC_ERR_NO_ERROR)
OSPM_FREE(*syncQueue);
} else {
errorcode = OSPC_ERR_MSGQ_NO_MEMORY;
}
return errorcode;
}
void SyncQueueDelete(SYNCQUEUE **syncQueue)
{
if (*syncQueue != OSPC_OSNULL) {
OSPM_FREE(*syncQueue);
*syncQueue = OSPC_OSNULL;
}
}
unsigned SyncQueueGetNumberOfTransactions(SYNCQUEUE *syncQueue)
{
unsigned RetVal = 0;
int errorcode = OSPC_ERR_NO_ERROR;
/* acquire mutex lock */
OSPM_MUTEX_LOCK(syncQueue->Mutex, errorcode);
if (errorcode == OSPC_ERR_NO_ERROR) {
RetVal = syncQueue->NumberOfTransactions;
/* release mutex lock */
OSPM_MUTEX_UNLOCK(syncQueue->Mutex, errorcode);
assert(errorcode == OSPC_ERR_NO_ERROR);
}
return RetVal;
}
int SyncQueueAddTransaction(SYNCQUEUE *syncQueue, void *transaction)
{
int errorcode = OSPC_ERR_NO_ERROR;
/*
* acquire message queue mutex
*/
if (errorcode == OSPC_ERR_NO_ERROR) {
OSPM_MUTEX_LOCK(syncQueue->Mutex, errorcode);
}
if (errorcode == OSPC_ERR_NO_ERROR) {
/*
* add the item to the message queue list
*/
OSPPListAppend(&(syncQueue->PayloadList), transaction);
/*
* increment number of transactions in the queue
*/
SyncQueueIncrementNumberOfTransactions(syncQueue);
/*
* signal the communication manager that a new
* transaction is now in the queue
*/
OSPM_CONDVAR_SIGNAL(syncQueue->CondVarNotEmpty, errorcode);
assert(errorcode == OSPC_ERR_NO_ERROR);
/* release msg queue mutex lock */
OSPM_MUTEX_UNLOCK(syncQueue->Mutex, errorcode);
assert(errorcode == OSPC_ERR_NO_ERROR);
}
return errorcode;
}
int SyncQueueRemoveTransaction(SYNCQUEUE *syncQueue, void **transaction)
{
int errorcode = OSPC_ERR_NO_ERROR;
/*
* acquire message queue mutex
*/
OSPM_MUTEX_LOCK(syncQueue->Mutex, errorcode);
if (errorcode == OSPC_ERR_NO_ERROR) {
/*
* wait for conditional variable on the transaction count
*/
while (0 == syncQueue->NumberOfTransactions) {
OSPM_CONDVAR_WAIT(syncQueue->CondVarNotEmpty, syncQueue->Mutex, errorcode);
}
if (errorcode == OSPC_ERR_NO_ERROR) {
/*
* thereis at least one transaction on the queue
*/
*transaction = OSPPListRemove(&(syncQueue->PayloadList));
SyncQueueDecrementNumberOfTransactions(syncQueue);
/*
* Are there any more transactions on the queue ?
*/
if (0 == syncQueue->NumberOfTransactions) {
OSPM_CONDVAR_SIGNAL(syncQueue->CondVarEmpty, errorcode);
}
}
/*
* release the mutex lock
*/
OSPM_MUTEX_UNLOCK(syncQueue->Mutex, errorcode);
}
return errorcode;
}
int SyncQueueBlockWhileNotEmpty(SYNCQUEUE *syncQueue)
{
int errorcode = OSPC_ERR_NO_ERROR;
/*
* acquire message queue mutex
*/
OSPM_MUTEX_LOCK(syncQueue->Mutex, errorcode);
if (errorcode == OSPC_ERR_NO_ERROR) {
/*
* wait for conditional variable on the transaction count
*/
while (syncQueue->NumberOfTransactions > 0) {
OSPM_CONDVAR_WAIT(syncQueue->CondVarEmpty, syncQueue->Mutex, errorcode);
}
/*
* release the mutex lock
*/
OSPM_MUTEX_UNLOCK(syncQueue->Mutex, errorcode);
}
return errorcode;
}
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