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#include "communication.h"
#include <unistd.h>
#include <iostream>
using namespace std;
jack_ringbuffer_t* request_ringbuf;
jack_ringbuffer_t* result_ringbuf;
pthread_mutex_t request_mutex;
void init_communication()
{
pthread_mutex_init(&request_mutex, NULL);
request_ringbuf=jack_ringbuffer_create(sizeof(request_t)+1);
result_ringbuf=jack_ringbuffer_create(sizeof(int)+1);
}
void uninit_communication()
{
jack_ringbuffer_free(request_ringbuf);
jack_ringbuffer_free(result_ringbuf);
pthread_mutex_destroy(&request_mutex);
}
int do_request(request_t request)
{
pthread_mutex_lock(&request_mutex); // only one request at a time
jack_ringbuffer_write(request_ringbuf, (char*)(&request), sizeof(request_t));
do // wait for the answer
{
usleep(10000);
} while (jack_ringbuffer_read_space(result_ringbuf)<sizeof(int));
int result;
if (jack_ringbuffer_read(result_ringbuf, (char*)(&result), sizeof(int)) != sizeof(int))
cout << "FATAL: short read from result ringbuffer, expect breakage!" << endl; // TODO handle properly
if (jack_ringbuffer_read_space(result_ringbuf)!=0)
cout << "FATAL: result ringbuffer not empty, expect breakage!" << endl; // TODO handle properly
pthread_mutex_unlock(&request_mutex);
return result;
}
bool request_available()
{
return (jack_ringbuffer_read_space(request_ringbuf)>=sizeof(request_t));
}
request_t get_request()
{
request_t request;
int len=jack_ringbuffer_read(request_ringbuf, (char*)(&request), sizeof(request_t));
if (len==0)
cout << "ERROR: no request on the ringbuffer! nothing read, continuing..." << endl;
else if (len!=sizeof(request_t))
{
cout << "possibly FATAL: short read from the request ringbuffer, expect breakage!" << endl;
request.type=request_t::NONE;
}
return request;
}
void request_finished(int result)
{
jack_ringbuffer_write(result_ringbuf, (char*)(&result), sizeof(int));
}
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