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

[Manohar Reddy]

Hi Bill,

Thanks for your prompt response.

We run multiple builds in parallel in different processes. Would calling
SideEffect() from one build in one process prevent mutual access to a file
from other builds running in separate processes?

Thanks
Manohar

On Sat, Jan 30, 2021 at 12:29 AM Bill Deegan <bill at baddogconsulting.com>
wrote:

> 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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