diff --git a/queue.c b/queue.c
new file mode 100644
index 0000000..e165a95
--- /dev/null
+++ b/queue.c
@@ -0,0 +1,136 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <pthread.h>
+
+#include "queue.h"
+
+
+uint8_t 
+CQueueIsFull(CQueue *queue)
+{
+    pthread_mutex_lock(&queue->mutex);
+    if(queue)
+    {   return (queue->front == queue->rear + 1) | ((!queue->front) & (queue->rear == (queue->datalen / (queue->datasize + !queue->datasize) - 1)));
+    }
+    pthread_mutex_unlock(&queue->mutex);
+    return 0;
+}
+
+uint8_t 
+CQueueIsEmpty(CQueue *queue)
+{
+    pthread_mutex_lock(&queue->mutex);
+    if(queue)
+    {   return (queue->front == -1);
+    }
+    pthread_mutex_unlock(&queue->mutex);
+    return 0;
+}
+
+uint8_t 
+CQueuePop(CQueue *queue)
+{
+    pthread_mutex_lock(&queue->mutex);
+    if(queue)
+    {
+        if(queue->front == -1)
+        {   return 0;
+        }
+        if(queue->front == queue->rear)
+        {   queue->front = queue->rear = -1;
+        }
+        else 
+        {   queue->front = (queue->front + 1) % queue->datalen;
+        }
+        return 1;
+    }
+    pthread_mutex_unlock(&queue->mutex);
+    return 0;
+}
+
+uint8_t 
+CQueueAdd(CQueue *queue, void *data)
+{
+    pthread_mutex_lock(&queue->mutex);
+    if(queue)
+    {
+        if(CQueueIsFull(queue))
+        {   return 0;
+        }
+        
+        if(queue->front == -1)
+        {   queue->front = 0;
+        }
+
+        queue->rear = (queue->rear + 1) % queue->datalen;
+        memcpy(queue->data[queue->rear], data, queue->datasize);
+        return 1;
+    }
+    pthread_mutex_unlock(&queue->mutex);
+    return 0;
+}
+
+void *
+CQueueGetFirst(CQueue *queue)
+{
+    pthread_mutex_lock(&queue->mutex);
+    if(queue)
+    {
+        if(queue->front == -1)
+        {   return NULL;
+        }
+        return queue->data[queue->front];
+    }
+    pthread_mutex_unlock(&queue->mutex);
+    return NULL;
+}
+
+void *
+CQueueGetLast(CQueue *queue)
+{
+    pthread_mutex_lock(&queue->mutex);
+    if(queue)
+    {
+        if(queue->rear == -1)
+        {   return NULL;
+        }
+        return queue->data[queue->rear];
+    }
+    pthread_mutex_unlock(&queue->mutex);
+    return NULL;
+}
+
+uint8_t
+CQueueCreate(void **data, uint32_t datalen, size_t sizeof_one_item, CQueue *_Q_RETURN)
+{
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+    if(pthread_mutex_init(&mutex, NULL))
+    {   return 1;
+    }
+    if(pthread_cond_init(&cond, NULL))
+    {   
+        pthread_mutex_destroy(&mutex);
+        return 1;
+    }
+    CQueue queue;
+    queue.data = data;
+    queue.datasize = sizeof_one_item;
+    queue.rear = -1;
+    queue.front = -1;
+    queue.mutex = mutex;
+    queue.cond = cond;
+    *_Q_RETURN = queue;
+    return 0;
+}
+
+void 
+CQueueDestroy(CQueue *queue)
+{
+    pthread_mutex_destroy(&queue->mutex);
+    pthread_cond_destroy(&queue->cond);
+}
+
+
diff --git a/queue.h b/queue.h
new file mode 100644
index 0000000..834c046
--- /dev/null
+++ b/queue.h
@@ -0,0 +1,63 @@
+#ifndef _XCB_QUEUE_
+#define _XCB_QUEUE_
+
+#include <stdio.h>
+#include <stdint.h>
+#include <pthread.h>
+
+
+typedef struct CQueue CQueue;
+
+struct CQueue
+{
+    int64_t front;
+    int64_t rear;
+    void **data;
+    uint32_t datalen;
+    size_t datasize;
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+};
+
+/*
+ * RETURN: NonZero on Full.
+ * RETURN: 0 on not Full.
+ */
+uint8_t CQueueIsFull(CQueue *queue);
+/*
+ * RETURN: 1 on Empty.
+ * RETURN: 0 on not Empty.
+ */
+uint8_t CQueueIsEmpty(CQueue *queue);
+/*
+ * RETURN: 1 on Success.
+ * RETURN: 0 on Failure.
+ */
+uint8_t CQueuePop(CQueue *queue);
+/*
+ * RETURN: 1 on Success.
+ * RETURN: 0 on Failure.
+ */
+uint8_t CQueueAdd(CQueue *queue, void *data);
+/*
+ * RETURN: void * on Success.
+ * RETURN: NULL on Failure.
+ */
+void *CQueueGetFirst(CQueue *queue);
+/*
+ * RETURN: void * on Success.
+ * RETURN: NULL on Failure.
+ */
+void *CQueueGetLast(CQueue *queue);
+/*
+ *
+ * RETURN: 0 on Success.
+ * RETURN: 1 on Failure.
+ */
+uint8_t CQueueCreate(void **data, uint32_t datalen, size_t size_of_one_item, CQueue *_Q_RETURN);
+/* Frees any data from queue.
+ */
+void CQueueDestroy(CQueue *queue);
+
+
+#endif