Anthony,

I've created a bug report on SF:
 https://sourceforge.net/tracker/index.php?func=detail&aid=580952&group_id=5470&atid=105470

and assigned it to Tim for initial review. I'm
suggesting that the imp module should grow
acquire_lock and release_lock so hooks can
do this right.

-- Gordon
http://www.mcmillan-inc.com/



On 12 Jul 2002 at 15:00, Anthony Tuininga wrote:

>  I just joined this list so my apologies if this has
>  been discussed before. The list (from the archives)
>  seems close to dead with a suggestion to kill it
>  permanently.... :-)
>  
>  I noticed that in PyImport_ImportModuleEx, that a lock
>  is held until the import is completed or an exception
>  is raised. The only problem is that the higher level
>  interface PyImport_Import does __NOT__ hold the lock
>  and this is the method that is used for hooks. The
>  builtin function __import__ calls
>  PyImport_ImportModuleEx but if that function is
>  replaced with a call to a hook, no locking takes place
>  which makes the import mechanism not thread safe.
>  
>  My question is: would there be a problem with holding
>  the lock during PyImport_Import? If there is, would
>  there be a problem with exposing a method that would do
>  the import lock? The only thing that is currently
>  available is imp.lock_held() but that simply states
>  whether or not the import lock is held and nothing that
>  I could see provides any mechanism for acquiring the
>  import lock.
>  
>  I am using Installer (from Gordon McMillan) and it is
>  using its own locking mechanism which seems to break
>  inside PythonCOM (from Mark Hammond) if a large enough
>  quantity of threads are executing. All of my imports
>  are done within the import of the main module which is
>  done using the normal method but I would like to solve
>  this problem in a more permanent way as otherwise I
>  will have to fork Installer for our own internal use.
>  Blech.
>  
>  -- 
>  Anthony Tuininga
>  anthony@[...].com
>  
>  Computronix
>  Distinctive Software. Real People.
>  Suite 200, 10216 - 124 Street NW
>  Edmonton, AB, Canada  T5N 4A3
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>  http://www.computronix.com
>  
>  
>  
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