acme.helpers.ReadWriteLock.ReadWriteLock

class documentation

class ReadWriteLock(object):

A lock object that allows many simultaneous "read locks", but only one "write lock."

Method	`__init__`	Initialize the ReadWriteLock object.
Method	`acquire_read`	Acquire a read lock. Blocks only if a thread has acquired the write lock.
Method	`acquire_write`	Acquire a write lock. Blocks until there are no acquired read or write locks.
Method	`release_read`	Release a read lock.
Method	`release_write`	Release a write lock.
Instance Variable	`_promote`	If True, then a reader thread can promote itself to a writer thread.
Instance Variable	`_read_ready`	Condition object to synchronize the read and write locks.
Instance Variable	`_readerList`	List of Reader thread IDs.
Instance Variable	`_readers`	Number of readers.
Instance Variable	`_writerList`	List of Writer thread IDs.
Instance Variable	`_writers`	Number of writers.

def __init__(self, withPromotion: bool | None = False): ¶

Initialize the ReadWriteLock object.

Parameters
withPromotion:`bool \| None`	If True, then a reader thread can promote itself to a writer thread.

def acquire_read(self): ¶

Acquire a read lock. Blocks only if a thread has acquired the write lock.

def acquire_write(self): ¶

Acquire a write lock. Blocks until there are no acquired read or write locks.

def release_read(self): ¶

Release a read lock.

def release_write(self): ¶

Release a write lock.

_promote = ¶

If True, then a reader thread can promote itself to a writer thread.

_read_ready = ¶

Condition object to synchronize the read and write locks.

_readerList: list[int] = ¶

List of Reader thread IDs.

_readers: int = ¶

Number of readers.

_writerList: list[int] = ¶

List of Writer thread IDs.

_writers: int = ¶

Number of writers.