| Name | threadsafevariable JSON |
| Version |
20230507.1
JSON |
| download |
| home_page | |
| Summary | Please read the README |
| upload_time | 2023-05-08 00:17:56 |
| maintainer | |
| docs_url | None |
| author | |
| requires_python | >=3.7 |
| license | |
| keywords |
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| VCS |
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| bugtrack_url |
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No requirements were recorded.
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# ThreadSafeVariable
## The problem
Imagine you have class like this
```
class A(object):
def __init__(self, x):
self.x = x
a = A(3)
print(a.x)
```
``a.x`` is a member variable of object ``a``. It is not thread safe. This means that if one thread changes `a.x``, all other threads see the new value. You can avoid this using a thread local object:
```
import threading
class A(object):
def __init__(self, x):
self.local = threading.local()
self.local.x
a = A(3)
print(a.local.x)
```
This works but has two downsides:
- you have changed the syntax
- even if a is accessible from other threads, a.local.x is only defined for the one thread that created the object
The ThreadSafeVariable module helps solve this problem and preserves the original syntax.
## The solution
We change the code in the first example by declaring which variables should the thrad safe:
```
from threadsafevariable import ThreadSafeVariable
class A(object):
x = ThreadSafeVariable() # we add this line
def __init__(self, x):
self.x = x
a = A(3)
print(a.x)
```
We have preserved the syntax for the first example but a.x is now a thread local variable.
In addition we can do:
```
iceblock = ThreadSafeVariable.freeze()
```
This will store a snapshot all ThreadSafeVariable(s) of all objects defined in the current thread.
Then for any other thread:
```
ThreadSafeVariable.restore(iceblock)
```
will restore all variables of all objects in this thread to the value stores in iceblock.
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"description": "# ThreadSafeVariable\n\n## The problem\n\nImagine you have class like this\n\n```\nclass A(object):\n def __init__(self, x):\n self.x = x\n\na = A(3)\nprint(a.x)\n```\n\n``a.x`` is a member variable of object ``a``. It is not thread safe. This means that if one thread changes `a.x``, all other threads see the new value. You can avoid this using a thread local object:\n\n```\nimport threading\n\nclass A(object): \n def __init__(self, x):\n self.local = threading.local()\n self.local.x\n\na = A(3)\nprint(a.local.x)\n``` \n\nThis works but has two downsides:\n\n- you have changed the syntax\n- even if a is accessible from other threads, a.local.x is only defined for the one thread that created the object\n\nThe ThreadSafeVariable module helps solve this problem and preserves the original syntax.\n\n## The solution\n\nWe change the code in the first example by declaring which variables should the thrad safe:\n\n```\nfrom threadsafevariable import ThreadSafeVariable\n\nclass A(object):\n x = ThreadSafeVariable() # we add this line\n def __init__(self, x):\n self.x = x\n\na = A(3)\nprint(a.x)\n```\n\nWe have preserved the syntax for the first example but a.x is now a thread local variable.\n\nIn addition we can do:\n\n```\niceblock = ThreadSafeVariable.freeze()\n```\n\nThis will store a snapshot all ThreadSafeVariable(s) of all objects defined in the current thread.\nThen for any other thread:\n\n```\nThreadSafeVariable.restore(iceblock)\n```\n\nwill restore all variables of all objects in this thread to the value stores in iceblock.\n",
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