Use unsigned types instead of long for threadqueue

include/ucore/threadqueue.h

@@ -100,10 +100,10 @@ struct uc_threadqueue {
  * Number of elements in the queue.
  * Use #threadqueue_length to read it.
  */
-	long num_elements;
+	unsigned int num_elements;
 
 /** Max number of elements this queue will hold */
-    long max_elements;
+    unsigned int max_elements;
 /**
  * Mutex for the queue.
  */
@@ -119,11 +119,11 @@ struct uc_threadqueue {
 /** 
  * Number of threads blocking on writing to the queue
  */
-    long num_read_waiters;
+    unsigned short num_read_waiters;
 /** 
  * Number of threads blocking on reading from  the queue
  */
-    long num_write_waiters;
+    unsigned short num_write_waiters;
 
 /**
  * Internal pointers for the messages in the queue.
@@ -146,7 +146,7 @@ struct uc_threadqueue {
  * @return 0 on success EINVAL if queue is NULL or max_elements <= 0, or
  * another errno value if pthread_ functions fails
  */
-int uc_thread_queue_init(struct uc_threadqueue *queue, long max_elements);
+int uc_thread_queue_init(struct uc_threadqueue *queue, unsigned int max_elements);
 
 /**
  * Adds a message to a queue
@@ -225,7 +225,7 @@ static inline int uc_thread_queue_get(struct uc_threadqueue *queue, struct uc_th
  * @param queue Pointer to the queue for which to get the length
  * @return the length(number of pending messages) in the queue
  */
-long uc_thread_queue_length( struct uc_threadqueue *queue );
+unsigned int uc_thread_queue_length( struct uc_threadqueue *queue );
 
 /**
  * Destroy the queue.

src/threadqueue.c

@@ -24,7 +24,7 @@ static inline void uc_get_absolute_time(struct timespec *result,
     }
 }
 
-int uc_thread_queue_init(struct uc_threadqueue *queue, long max_elements)
+int uc_thread_queue_init(struct uc_threadqueue *queue, unsigned int max_elements)
 {
     int rc = 0;
     if (queue == NULL || max_elements <= 0) {
@@ -265,9 +265,9 @@ int uc_thread_queue_destroy(struct uc_threadqueue *queue,
 }
 
 
-long uc_thread_queue_length(struct uc_threadqueue *queue)
+unsigned int uc_thread_queue_length(struct uc_threadqueue *queue)
 {
-    long length;
+    unsigned int length;
 
     if (queue == NULL ) {
         return -EINVAL;