dp_util.c

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#include "dp_util.h"
void dputil_lock(void *handle) {
    if(!handle) {
        return;
    }
        pthread_mutex_lock((pthread_mutex_t *)handle);
}
void dputil_unlock(void *handle) {
    if(!handle) {
        return;
    }
        pthread_mutex_unlock((pthread_mutex_t *)handle);
}

void dputil_list_push(DPUtilList this, DPUtilListData data) {
        /* add to tail */
        data->prev = this->tail;
        //slide tail
        if(this->tail) {
                this->tail->next = data;
        }
        this->tail = data;

        /* if head is null, set to head */
        if(!this->head) {
                this->head = data;
        }
}

void dputil_list_insert(DPUtilList this, DPUtilListData prev, DPUtilListData data) {

    /*add to tail*/
    if(!prev) {
        dputil_list_push(this, data);
        return;
    }

    //there is a prev.
    data->next = prev->next;
    data->prev = prev;

    //only to care prev has next or not
    if(prev->next) {
        prev->next->prev = data;
    } else {
        //there is no next=> prev is tail
        this->tail = data;
    }

    prev->next = data;
}

void dputil_list_pull(DPUtilList this, DPUtilListData data) {
        if(!data) {
                return;
        }

        /* update content */
        if(this->head == data) {
                this->head = data->next;
        } else {
                /* else case, account is not head. So there is a prev. */
                data->prev->next = data->next;
        }

        if(this->tail == data) {
                this->tail = data->prev;
        } else {
                /* else case, account is not tail. So there is a next. */
                data->next->prev = data->prev;
        }
}

DPUtilListData dputil_list_pop(DPUtilList this) {
        DPUtilListData data = this->head;
    dputil_list_pull(this, data);
    return data;
}