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Return a string which is used to differentiate pid namespaces
It's useful to detect "dead" processes and remove stale locks with
confidence. Typically it's just hostname. On modern linux, we include an
extra Linux-specific pid namespace identifier.
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a@ Block signal interrupt while doing something critical
This makes sure that the code block wrapped by this context manager won't
be interrupted.
For Windows developers: It appears not possible to guard time.sleep()
from CTRL_C_EVENT, so please don't use time.sleep() to test if this is
working.
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dd� Zdd� Zd dd �ZdS ) r4 a� An advisory lock held by one process to control access to a set
of files. Non-cooperating processes or incorrectly written scripts
can ignore Mercurial's locking scheme and stomp all over the
repository, so don't do that.
Typically used via localrepository.lock() to lock the repository
store (.hg/store/) or localrepository.wlock() to lock everything
else under .hg/.Nr3 Tc C sn || _ || _d| _|| _|| _|| _|| _|r6t| _nt j
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d}~0 0 dS )z�read lock and return its value
Returns None if no lock exists, pid for old-style locks, and host:pid
for new-style locks.
N)r? ZreadlockrF r rd r r )rL ri r r r re 3 s zlock._readlockc C sx |d u r dS z|� dd�\}}W n ty4 Y dS 0 |tjkrDdS z t|�}W n tyd Y dS 0 t�|�rtdS dS )NFr( r T)r) r$ r4 rc �intr
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0zlock._testlockc C s | � � }| �|�S )ao return id of locker if lock is valid, else None.
If old-style lock, we cannot tell what machine locker is on.
with new-style lock, if locker is on this machine, we can
see if locker is alive. If locker is on this machine but
not alive, we can safely break lock.
The lock file is only deleted when None is returned.
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lock.testlockc C s� | j dkr| j d8 _ n�| j dkr�d| _ | �� | jkr<dS z8| jrL| �� W z| j�| j� W q� tyr Y q�0 n(z| j�| j� W n ty� Y n0 0 | jD ] }||� q�d| _dS )z�release the lock and execute callback function if any
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