flipperzero-firmware/core/api-basic/pubsub.c

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#include "pubsub.h"
#include "flipper_v2.h"
bool init_pubsub(PubSub* pubsub) {
// mutex without name,
// no attributes (unfortunatly robust mutex is not supported by FreeRTOS),
// with dynamic memory allocation
const osMutexAttr_t value_mutex_attr = {
.name = NULL, .attr_bits = 0, .cb_mem = NULL, .cb_size = 0U};
pubsub->mutex = osMutexNew(&value_mutex_attr);
if(pubsub->mutex == NULL) return false;
// construct list
list_pubsub_cb_init(pubsub->items);
return true;
}
bool delete_pubsub(PubSub* pubsub) {
if(osMutexAcquire(pubsub->mutex, osWaitForever) == osOK) {
bool result = osMutexDelete(pubsub->mutex) == osOK;
list_pubsub_cb_clear(pubsub->items);
return result;
} else {
return false;
}
}
PubSubItem* subscribe_pubsub(PubSub* pubsub, PubSubCallback cb, void* ctx) {
if(osMutexAcquire(pubsub->mutex, osWaitForever) == osOK) {
// put uninitialized item to the list
PubSubItem* item = list_pubsub_cb_push_raw(pubsub->items);
// initialize item
item->cb = cb;
item->ctx = ctx;
item->self = pubsub;
// TODO unsubscribe pubsub on app exit
//flapp_on_exit(unsubscribe_pubsub, item);
osMutexRelease(pubsub->mutex);
return item;
} else {
return NULL;
}
}
bool unsubscribe_pubsub(PubSubItem* pubsub_id) {
if(osMutexAcquire(pubsub_id->self->mutex, osWaitForever) == osOK) {
bool result = false;
// iterate over items
list_pubsub_cb_it_t it;
for(list_pubsub_cb_it(it, pubsub_id->self->items); !list_pubsub_cb_end_p(it);
list_pubsub_cb_next(it)) {
const PubSubItem* item = list_pubsub_cb_cref(it);
// if the iterator is equal to our element
if(item == pubsub_id) {
list_pubsub_cb_remove(pubsub_id->self->items, it);
result = true;
break;
}
}
osMutexRelease(pubsub_id->self->mutex);
return result;
} else {
return false;
}
}
bool notify_pubsub(PubSub* pubsub, void* arg) {
if(osMutexAcquire(pubsub->mutex, osWaitForever) == osOK) {
// iterate over subscribers
list_pubsub_cb_it_t it;
for(list_pubsub_cb_it(it, pubsub->items); !list_pubsub_cb_end_p(it);
list_pubsub_cb_next(it)) {
const PubSubItem* item = list_pubsub_cb_cref(it);
item->cb(arg, item->ctx);
}
osMutexRelease(pubsub->mutex);
return true;
} else {
return false;
}
}