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//
// $Id$
//
#ifndef __LED_SERVER_h
#define __LED_SERVER_h
#include "MessageQueueT.h"
#include <unistd.h>
#include <time.h>
#include "../led.h"
namespace Examples {
class LEDServer {
private:
typedef enum {
StopLED,
StartLED,
ShutdownLED,
SetRate
} Discriminator_t;
typedef struct {
Discriminator_t discriminator;
union {
struct {
unsigned int on_period_in_milliseconds;
unsigned int off_period_in_milliseconds;
} Rate;
} Args;
} Message_t;
typedef OSWrapper::MessageQueueTemplate<Message_t> LEDQ_t;
LEDQ_t *mQueue;
pthread_t mThread;
static void *LEDServerThread( void *arg )
{
Examples::LEDServer *led = (Examples::LEDServer *)arg;
return led->ThreadBody();
}
public:
void *ThreadBody(void)
{
bool active = false;
unsigned int ledCount = 0;
unsigned int onPeriod = 0;
unsigned int offPeriod = 0;
Message_t m;
while ( 1 ) {
if ( mQueue->IsAvailable() ) {
mQueue->Read( &m );
switch ( m.discriminator ) {
case StartLED:
std::cerr << "StartLED" << std::endl;
active = true;
break;
case StopLED:
std::cerr << "StopLED" << std::endl;
active = false;
break;
case SetRate:
std::cerr << "SetRate: "
<< "on=" << m.Args.Rate.on_period_in_milliseconds
<< " off=" << m.Args.Rate.off_period_in_milliseconds
<< std::endl;
onPeriod = m.Args.Rate.on_period_in_milliseconds;
offPeriod = m.Args.Rate.off_period_in_milliseconds;
break;
case ShutdownLED:
std::cerr << "Shutdown of LED Server requested" << std::endl;
goto thread_exit;
break;
default:
break;
}
}
if ( active ) {
struct timespec ts;
unsigned int p;
if ( (++ledCount % 2) == 1 ) {
LED_ON();
p = onPeriod;
} else {
LED_OFF();
p = offPeriod;
}
p = (p) ? p : 500;
ts.tv_sec = (p / 1000);
ts.tv_nsec = (p * 1000000) % 1000000000;
nanosleep( &ts, NULL );
} else {
sleep(1);
}
}
thread_exit:
return NULL;
}
public:
LEDServer()
{
int status;
mQueue = new LEDQ_t( std::string("LEDQ"), (unsigned int) 10 );
status =
pthread_create( &mThread, NULL, LEDServerThread, (void *)this );
if ( status ) {
std::cerr << "LEDServer: pthread_create failed "
<< status << std::endl;
}
}
~LEDServer()
{
Message_t msg;
msg.discriminator = ShutdownLED;
mQueue->Write( &msg );
sleep(1);
delete mQueue;
}
void start( void )
{
Message_t msg;
msg.discriminator = StartLED;
mQueue->Write( &msg );
}
void stop( void )
{
Message_t msg;
msg.discriminator = StopLED;
mQueue->Write( &msg );
}
void setPeriod( unsigned int on, unsigned int off )
{
Message_t msg;
if ( !on || !off ) {
std::cerr << "setPeriod: 0 period is not allowed" << std::endl;
return;
}
msg.discriminator = SetRate;
msg.Args.Rate.on_period_in_milliseconds = on;
msg.Args.Rate.off_period_in_milliseconds = off;
mQueue->Write( &msg );
}
};
}
#endif
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