On Fri, 16 Jul 2004 10:36:27 -0400, Brad Clements <[EMAIL PROTECTED]> wrote:
> The SAP folks say their adapter is "multi-thread capable", but I've come to believe > that only > means that it's ok to open a connection in one thread and use it in another, but NOT > to have > 2 threads make requests on the same connection at the same time. I would be surprised to find any database API that allowed that. Generally "thread-safe" means that there are no global state variables, i.e. all connection state is encapsulated in the connection object/struct. Generally I would not try to share connections between threads at all. To do it, you'd need to ensure that a thread performs a commit or rollback on the connection before another thread can use it, i.e. performs a complete transaction or none at all. Otherwise you will have all sorts of interesting problems. > Also, two threads can' t open a connection "at the same time" because their > connection table > management isn't "thread safe". That does suck, but it doesn't seem like an insurmountable problem for a DA. You just need a per-DA instance mutex which you acquire before opening a connection release afterwards. _______________________________________________ Zope-Dev maillist - [EMAIL PROTECTED] http://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://mail.zope.org/mailman/listinfo/zope-announce http://mail.zope.org/mailman/listinfo/zope )
