[Scons-users] Suggestions for using MP Mutex during Action phase of build

[Bill Deegan]

Greetings,

You should probably be using SideEffect() if you're trying to prevent
mutual access to a file.

-Bill

On Fri, Jan 29, 2021 at 8:14 AM Manohar Reddy <manohar.mavilla at gmail.com>
wrote:

> Dear Scons Community users,
>
> In SCons, we have support for a multi-process mutex that can be acquired
> by each build variant to coordinate writing to a shared file. The mutex is
> implemented through two methods:
>
> env.AcquireMPMutex()
> env.ReleaseMPMutex()
>
> Example usage:
>
> env.AcquireMPMutex("foo_file")
> if not os.exists("foo.file"):
>     env.FooBuilder("foo.file", "foo.source")
> env.ReleaseMPMutex("foo_file")
>
> But, this is currently not working for the action phase of the build.  In
> the example above, the call to env.FooBuilder() is protected by the mutex,
> but this only queues up the action for SCons to perform later, and by the
> time SCons executes this action, the mutex will have already been released,
> so the actual action is not being protected.
>
> Can someone guide us on any alternative approach where the pre-action and
> post-action are performed right before and after the execution of the
> action?
>
> Thanks
> Manohar
>
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