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python Programming Glossary: lockWeird closure behavior in python http://stackoverflow.com/questions/11109838/weird-closure-behavior-in-python in its scope is '3' all three closures return the same. To lock the current value of a variable create a new scope just for..
http://stackoverflow.com/questions/1190206/threading-in-python in fact in its own thread. Sharing data is if not easy locks are never easy at least simple. Cons As mentioned by Juergen.. access state in the interpreter there's one big lock the infamous Global Interpreter Lock . What that means in practice.. If for some reason you don't know when and how to use locks and conditions you have to start with those. Multitasking code..
What is a global interpreter lock (GIL)? http://stackoverflow.com/questions/1294382/what-is-a-global-interpreter-lock-gil is a global interpreter lock GIL What is a global interpreter lock and why is that an issue.. global interpreter lock GIL What is a global interpreter lock and why is that an issue A lot noise has been made around removing.. writers need to release the GIL when their extensions do blocking I O so that other threads in the Python process get a chance..
What is the best way to open a file for exclusive access in Python? http://stackoverflow.com/questions/186202/what-is-the-best-way-to-open-a-file-for-exclusive-access-in-python It is preferred if a crashing program will not keep the lock open. python file locking share improve this question I.. crashing program will not keep the lock open. python file locking share improve this question I don't think there is a.. Fortunately there is a portable implementation portalocker using the platform appropriate method at the python cookbook...
Does python support multiprocessor/multicore programming? http://stackoverflow.com/questions/203912/does-python-support-multiprocessor-multicore-programming by executing multiple threads. The global interpreter lock in the CPython and PyPy runtimes preclude this option but only..
Ensuring a single instance of an application in Linux http://stackoverflow.com/questions/220525/ensuring-a-single-instance-of-an-application-in-linux to have to burden my users with having to manually delete lock files because I crashed. python linux singleinstance share.. The one I see used most often is to create a pid lock file on startup that contains the pid of the running process...
http://stackoverflow.com/questions/261638/how-do-i-protect-python-code code compiled interpreted language is very difficult to lock down. Even if you use a exe packager like py2exe the layout..
What is the python “with” statement designed for? [closed] http://stackoverflow.com/questions/3012488/what-is-the-python-with-statement-designed-for are opening files using with open filename as fp acquiring locks using with lock where lock is an instance of threading.Lock.. using with open filename as fp acquiring locks using with lock where lock is an instance of threading.Lock . You can also construct.. open filename as fp acquiring locks using with lock where lock is an instance of threading.Lock . You can also construct your..
Multiprocessing vs Threading Python http://stackoverflow.com/questions/3044580/multiprocessing-vs-threading-python at the same time. This is what the global interpreter lock is for. Spawning processes is a bit slower than spawning threads...
Python: single instance of program http://stackoverflow.com/questions/380870/python-single-instance-of-program is expected to fail sometimes i.e. segfault so things like lock file won't work Update the solutions offered are much more complex.. server so I'd have to go with that one. python singleton locking share improve this question The following code should..
What does `if __name__ == “__main__”:` do? http://stackoverflow.com/questions/419163/what-does-if-name-main-do example import time thread def myfunction string sleeptime lock args while 1 lock.acquire time.sleep sleeptime lock.release.. thread def myfunction string sleeptime lock args while 1 lock.acquire time.sleep sleeptime lock.release time.sleep sleeptime.. lock args while 1 lock.acquire time.sleep sleeptime lock.release time.sleep sleeptime if __name__ __main__ lock thread.allocate_lock..
http://stackoverflow.com/questions/489861/locking-a-file-in-python a file in Python I need to lock a file for writing in Python. It will be accessed from multiple.. are often only Unix based or Windows based. python file locking share improve this question Alright so I ended up going.. website . I can use it in the following fashion from filelock import FileLock with FileLock myfile.txt # work with the file..
http://stackoverflow.com/questions/7933596/django-dynamic-model-fields to be considered. You need to be sure to maintain a proper lock in order to allow simultaneous database altering requests. If..
how do I parallelize a simple python loop? http://stackoverflow.com/questions/9786102/how-do-i-parallelize-a-simple-python-loop for pure Python code due to the global interpreter lock GIL . I suggest to use the multiprocessing module instead pool..
Are locks unnecessary in multi-threaded Python code because of the GIL? http://stackoverflow.com/questions/105095/are-locks-unnecessary-in-multi-threaded-python-code-because-of-the-gil an implementation of Python that has a Global Interpreter Lock i.e. CPython and writing multithreaded code do you really need..
http://stackoverflow.com/questions/1190206/threading-in-python there's one big lock the infamous Global Interpreter Lock . What that means in practice is that threads are useful for.. Actual concurrency for all tasks no Global Interpreter Lock . Scales to multiple processors can even scale to multiple machines..
How to make built-in containers (sets, dicts, lists) thread safe? http://stackoverflow.com/questions/13610654/how-to-make-built-in-containers-sets-dicts-lists-thread-safe own. Therefore I could come up with from threading import Lock class LockedSet set A set where add and remove are thread safe.. I could come up with from threading import Lock class LockedSet set A set where add and remove are thread safe def __init__.. def __init__ self args kwargs # Create a lock self._lock Lock # Call the original __init__ super LockedSet self .__init__..
http://stackoverflow.com/questions/1482282/java-vs-python-on-hadoop Python is also held back by its Global Interpreter Lock meaning it cannot push threads of a single process onto different..
PyEval_InitThreads in Python 3: How/when to call it? (the saga continues ad nauseum) http://stackoverflow.com/questions/15470367/pyeval-initthreads-in-python-3-how-when-to-call-it-the-saga-continues-ad-naus PyEval_InitThreads and then release the Global Interpreter Lock. Okay seems straightforward enough. So prima facie all that's.. initialize threading and acquire GIL PyEval_ReleaseLock Release GIL Seems easy enough... but unfortunately the Python.. the Python 3.2 docs also say that PyEval_ReleaseLock has been deprecated . Instead we're supposed to use PyEval_SaveThread..
Why the Global Interpreter Lock? http://stackoverflow.com/questions/265687/why-the-global-interpreter-lock the Global Interpreter Lock What is exactly the function of Python's Global Interpreter.. is exactly the function of Python's Global Interpreter Lock Do other languages that are compiled to bytecode employ a similar..
Multiprocessing vs Threading Python http://stackoverflow.com/questions/3044580/multiprocessing-vs-threading-python that Multiprocessing get's around the Global Interpreter Lock but what other advantages are there and can threading not do..
How do threads work in Python, and what are common Python-threading specific pitfalls? http://stackoverflow.com/questions/31340/how-do-threads-work-in-python-and-what-are-common-python-threading-specific-pit this question Yes because of the Global Interpreter Lock GIL there can only run one thread at a time. Here are some links..
http://stackoverflow.com/questions/489861/locking-a-file-in-python a file in Python I need to lock a file for writing in Python... use it in the following fashion from filelock import FileLock with FileLock myfile.txt # work with the file as it is now locked.. following fashion from filelock import FileLock with FileLock myfile.txt # work with the file as it is now locked print Lock..
Python Global Interpreter Lock (GIL) workaround on multi-core systems using taskset on Linux? http://stackoverflow.com/questions/990102/python-global-interpreter-lock-gil-workaround-on-multi-core-systems-using-task Global Interpreter Lock GIL workaround on multi core systems using taskset on Linux.. watching this talk on the Python Global Interpreter Lock GIL http blip.tv file 2232410 . The gist of it is that the GIL..
Why is there no GIL in the Java Virtual Machine? Why does Python need one so bad? http://stackoverflow.com/questions/991904/why-is-there-no-gil-in-the-java-virtual-machine-why-does-python-need-one-so-bad threads nicely without the need for a Global Interpreter Lock GIL while Python necessitates such an evil. java python multithreading..
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