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Status Delivered
Workspace z/OS
Categories Ported Tools
Created by Guest
Created on Feb 10, 2023

RELATED IDEAS

Set a specific zlib for zEDC stream to use software instead of hardware via a thread-safe method

I need to be able to perform raw deflate/inflate with compression dictionaries. Currently, there is a limitation where the hardware accelerator does not support the zlib function inflateSetDictionary() when using raw inflate. So I would like to be able to programmatically switch to using software to perform raw inflate that requires a dictionary.

I see in the documentation that the environment variable _HZC_COMPRESSION_METHOD=software can be set to force zEDC to use software. However, I don’t want to turn off the hardware accelerator completely for all operations. I would like to still be able to perform standard deflate/inflate using the hardware accelerator.

I have looked into using setenv() to set the environment variable prior to calling inflateInit2(), and then use unsetenv() to unset the environment variable after inflateEnd(). Unfortunately, I can’t use this solution as my application is multithreaded, and setenv() is not thread-safe. There could be a race condition where Thread A sets _HZC_COMPRESSION_METHOD=software, and then Thread B unsets the environment variable before Thread A is able to call inflateInit2(). 

So I need to be able to initialize a specific stream to use software via a thread-safe function call, or some other method.

Idea priority High
  • Guest
    Reply
    |     Apr 25, 2024
    This request has been delivered via APAR OA65661.
  • Guest
    Reply
    |     Feb 13, 2023
    put this in candidate list for next release. Will discuss with PM about the plan when start development work for next release.

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