examples/dm_example/phase2a/private/src/phase2a_cmp.c

/**
 *Licensed to the Apache Software Foundation (ASF) under one
 *or more contributor license agreements.  See the NOTICE file
 *distributed with this work for additional information
 *regarding copyright ownership.  The ASF licenses this file
 *to you under the Apache License, Version 2.0 (the
 *"License"); you may not use this file except in compliance
 *with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *Unless required by applicable law or agreed to in writing,
 *software distributed under the License is distributed on an
 *"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 *specific language governing permissions and limitations
 *under the License.
 */
/*
 * publisher.c
 *
 *  \date       Oct 29, 2015
 *  \author    	<a href="mailto:dev@celix.apache.org">Apache Celix Project Team</a>
 *  \copyright	Apache License, Version 2.0
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>

#include "celix_threads.h"
#include "phase2a_cmp.h"

#define SLEEPTIME 2000000

struct phase2a_cmp_struct {
	celix_thread_t thread;
    bool running;
	double currentValue;
    celix_thread_mutex_t mutex;
    phase1_t *phase1Serv;
};

static void *phase2a_thread(void *data);

phase2a_cmp_t *phase2a_create(void) {
	phase2a_cmp_t *cmp = calloc(1, sizeof(*cmp));
	if (cmp != NULL) {
		cmp->currentValue = 0.0;
        cmp->running = false;
        celixThreadMutex_create(&cmp->mutex, NULL);
	}
	return cmp;
}

int phase2a_init(phase2a_cmp_t *cmp) {
	printf("init phase2a\n");
    return 0;
}

int phase2a_start(phase2a_cmp_t *cmp) {
	printf("start phase2a\n");
    cmp->running = true;
    celixThread_create(&cmp->thread, NULL, phase2a_thread, cmp);
    return 0;
}

int phase2a_stop(phase2a_cmp_t *cmp) {
	printf("stop phase2a\n");
    cmp->running = false;
    celixThread_kill(cmp->thread, SIGUSR1);
    celixThread_join(cmp->thread, NULL);
    return 0;
}

int phase2a_deinit(phase2a_cmp_t *cmp) {
    printf("deinit phase1\n");
    return 0;
}

void phase2a_destroy(phase2a_cmp_t *cmp) {
    celixThreadMutex_lock(&cmp->mutex);
    celixThreadMutex_destroy(&cmp->mutex);
    free(cmp);
	printf("destroy phase2a\n");
}

int phase2a_setPhase1(phase2a_cmp_t *cmp, phase1_t *phase1) {
    printf("phase2a_setPhase1 called!\n\n");
    celixThreadMutex_lock(&cmp->mutex);
    cmp->phase1Serv = phase1;
    celixThreadMutex_unlock(&cmp->mutex);
    return 0;
}

static void *phase2a_thread(void *data) {
    phase2a_cmp_t *cmp = data;
    unsigned int counter;

    while (cmp->running) {
        celixThreadMutex_lock(&cmp->mutex);
        if (cmp->phase1Serv != NULL) {
            cmp->phase1Serv->getData(cmp->phase1Serv->handle, &counter);
            cmp->currentValue = 1.0 / counter;
        }
        celixThreadMutex_unlock(&cmp->mutex);
        usleep(SLEEPTIME);
    }

    celixThread_exit(NULL);
    return NULL;
}

int phase2a_getData(phase2a_cmp_t *cmp, double *data) {
    *data = cmp->currentValue;
    return 0;
}