B
    a\                 @   s   d dl Z d dlmZ d dlZd dlZyd dlmZ W n  ek
rT   d dlmZ Y nX dddgZG dd de	Z
ejd	krd
d Zndd ZdddZdddZdd Zdd Zdd adddZdddZdS )    N)partial)	monotonic)timeNoWayToWaitForSocketErrorwait_for_readwait_for_writec               @   s   e Zd ZdS )r   N)__name__
__module____qualname__ r   r   0lib/python3.7/site-packages/urllib3/util/wait.pyr      s   )      c             C   s   | |S )Nr   )fntimeoutr   r   r   _retry_on_intr)   s    r   c          
   C   s   |d krt d}n
t | }xry| |S  ttjfk
r } z@|jd tjkrR n(|t  }|dk rhd}|t dkrxd }wW d d }~X Y qX qW d S )Ninfr   )floatr   OSErrorselecterrorargserrnoZEINTR)r   r   Zdeadlineer   r   r   r   -   s    


Fc       
      C   sd   |s|st dg }g }|r&||  |r4||  ttj|||}t||\}}}	t|p`|p`|	S )Nz2must specify at least one of read=True, write=True)RuntimeErrorappendr   r   r   bool)
sockreadwriter   ZrcheckZwcheckr   ZrreadyZwreadyZxreadyr   r   r   select_wait_for_socketD   s    

r    c                s^   |s|st dd}|r"|tjO }|r0|tjO }t   | |  fdd}tt||S )Nz2must specify at least one of read=True, write=Truer   c                s   | d k	r| d9 }   | S )Ni  )poll)t)poll_objr   r   do_pollc   s    z%poll_wait_for_socket.<locals>.do_poll)r   r   ZPOLLINZPOLLOUTr!   registerr   r   )r   r   r   r   maskr$   r   )r#   r   poll_wait_for_socketW   s    

r'   c              O   s   t dd S )Nzno select-equivalent available)r   )r   kwargsr   r   r   null_wait_for_socketk   s    r)   c           	   C   s:   yt  } t| jd W n ttfk
r0   dS X dS d S )Nr   FT)r   r!   r   AttributeErrorr   )r#   r   r   r   _have_working_pollo   s    r+   c              O   s*   t  rtanttdrtantat| |S )Nr   )r+   r'   wait_for_sockethasattrr   r    r)   )r   r(   r   r   r   r,   |   s    
r,   c             C   s   t | d|dS )z Waits for reading to be available on a given socket.
    Returns True if the socket is readable, or False if the timeout expired.
    T)r   r   )r,   )r   r   r   r   r   r      s    c             C   s   t | d|dS )z Waits for writing to be available on a given socket.
    Returns True if the socket is readable, or False if the timeout expired.
    T)r   r   )r,   )r   r   r   r   r   r      s    )FFN)FFN)N)N)r   	functoolsr   r   sysr   r   ImportError__all__	Exceptionr   version_infor   r    r'   r)   r+   r,   r   r   r   r   r   r   <module>   s&   





