handlers.c

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/************************************************************
 *                                                          *
 * Copyright (c) 2001-2007 McObject LLC. All Right Reserved.*
 *                                                          *
 ************************************************************/

#include "async.h"

long ev_new_count = 0;
long ev_update_count = 0;
long ev_del_count = 0;

/* Thread function that handles the <new> event. The visit count
 * is incremented. When the <new> object is created, eXtremeDB
 * runtime wakes up the Event_NewHndlr thread - the call to
 * mco_async_event_wait() retunrs with MCO_S_OK (zero). When the
 * main thread explicitely releses the event, the thread is also
 * awakened, but with the return code MCO_S_EVENT_RELEASED (14).
 * This return value forces the thread function to return, thus
 * terminating the thread.
 */
THREAD_PROC_DEFINE(Event_NewHndlr, p)
{
    ThrParam* p_ = (ThrParam*)p;
    mco_db_h db = p_->db;
    MCO_RET rc;

    p_->finished = 0;
    for (;;)
    {
        rc = mco_async_event_wait(db, MCO_EVENT_newEvent);
        if (rc)
        {
            printf("Exiting Event_NewHndlr thread\n");
            p_->finished = 1;
            return ;
        }
        ev_new_count++;
        printf("NewEvent handler is called\n");
    }
}


/* Thread function that handles the <update> event. The visit count
 * is incremented.
 */
THREAD_PROC_DEFINE(Event_UpdateHndlr, p)
{
    ThrParam* p_ = (ThrParam*)p;
    mco_db_h db = p_->db;
    MCO_RET rc;
    p_->finished = 1;

    for (;;)
    {
        rc = mco_async_event_wait(db, MCO_EVENT_updateEvent);
        if (rc)
        {
            printf("Exiting Event_UpdateHndlr thread\n");
            p_->finished = 1;
            return ;
        }
        ev_update_count++;
        printf("UpdateEvent handler is called\n");
    }
}

/* Thread function that handles the <update> event. The visit count
 * is incremented.
 */
THREAD_PROC_DEFINE(Event_UpdateHndlr2, p)
{
    ThrParam* p_ = (ThrParam*)p;
    mco_db_h db = p_->db;
    MCO_RET rc;
    p_->finished = 1;

    for (;;)
    {
        rc = mco_async_event_wait(db, MCO_EVENT_updateEvent2);
        if (rc)
        {
            printf("Exiting Event_UpdateHndlr2 thread\n");
            p_->finished = 1;
            return ;
        }
        ev_update_count++;
        printf("UpdateEvent handler2 is called\n");
    }
}

/* Thread function that handles the <update> event. The visit count
 * is incremented.
 */
THREAD_PROC_DEFINE(Event_UpdateHndlr3, p)
{
    ThrParam* p_ = (ThrParam*)p;
    mco_db_h db = p_->db;
    MCO_RET rc;
    p_->finished = 1;

    for (;;)
    {
        rc = mco_async_event_wait(db, MCO_EVENT_updateEvent3);
        if (rc)
        {
            printf("Exiting Event_UpdateHndlr3 thread\n");
            p_->finished = 1;
            return ;
        }
        ev_update_count++;
        printf("UpdateEvent handler3 is called\n");
    }
}

/* Thread function that handles the <delete> event. The visit count
 * is incremented.
 */
THREAD_PROC_DEFINE(Event_DeleteHndlr, p)
{
    ThrParam* p_ = (ThrParam*)p;
    mco_db_h db = p_->db;
    MCO_RET rc;

    p_->finished = 0;

    for (;;)
    {
        rc = mco_async_event_wait(db, MCO_EVENT_deleteEvent);
        if (rc)
        {
            printf("Exiting Event_DeleteHndlr thread\n");
            p_->finished = 1;
            return ;
        }
        ev_del_count++;
        printf("DeleteEvent handler is called\n");
    }
}


/* Starts all the event-handling threads
 */
void threads(ThrParam* all_tp_ptr)
{
    THREAD_ID_T event_new_id;
    THREAD_ID_T event_update_id;
    THREAD_ID_T event_del_id;
    THREAD_ID_T event_update2_id;
    THREAD_ID_T event_update3_id;

    THREAD_PROC_START(Event_NewHndlr, &all_tp_ptr[0], &event_new_id);
    Sleep(100);
    THREAD_PROC_START(Event_UpdateHndlr, &all_tp_ptr[1], &event_update_id);
    Sleep(100);
    THREAD_PROC_START(Event_DeleteHndlr, &all_tp_ptr[2], &event_del_id);
    Sleep(100);
    THREAD_PROC_START(Event_UpdateHndlr2, &all_tp_ptr[3], &event_update2_id);
    Sleep(100);
    THREAD_PROC_START(Event_UpdateHndlr3, &all_tp_ptr[4], &event_update3_id);
    Sleep(100);

}