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Expose IsGoogleLoggingInitialized() in public API. #651

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merged 1 commit into from
May 14, 2021

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@xkszltl xkszltl commented May 13, 2021

Usually library does not have control of the process lifespan.
Without this function, it is impossible to init/shutdown reliably.
It has been one of the major pain points for years when using glog in libraries.

AFAIK 3 workarounds have been used previously:

  1. Init without checking. This causes compatiblity issues with other libs using glog.
  2. Also provide a init function in library's API. This makes API complicated and stateful, especially for libs that does not mean to stay for the entire life of process.
  3. Steal the utility function in internal namespace. Does not work with msvc (due to missing dllexport) or gcc -fvisibility=hidden.

None of them are perfect, except for the last hack that usually works well on Linux.
0.5.0 changes default visibility to hidden and it does not work anymore.

Resolve #125

@google-cla google-cla bot added the cla: yes label May 13, 2021
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xkszltl commented May 13, 2021

@sergiud

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A simple test checking the result of IsGoogleLoggingInitialized before and after init, and also after a shutdown should be added as well.

src/logging.cc Outdated Show resolved Hide resolved
@sergiud sergiud self-assigned this May 13, 2021
@sergiud sergiud added this to the next milestone May 13, 2021
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xkszltl commented May 13, 2021

Tests added.

xkszltl added a commit to xkszltl/Roaster that referenced this pull request May 13, 2021
@xkszltl xkszltl force-pushed the initapi branch 2 times, most recently from 648cfbc to 61196e1 Compare May 13, 2021 23:16
src/utilities.cc Outdated Show resolved Hide resolved
src/utilities.h Outdated Show resolved Hide resolved
Usually library does not have control of the process lifespan.
Without this function, it is impossible to init/shutdown reliably.
It has been one of the major pain points for years when using glog in libraries.

AFAIK 3 workarounds have been used previously:
1. Init without checking. This causes compatiblity issues with other libs using glog.
2. Also provide a init function in library's API. This makes API complicated and stateful, especially for libs that does not mean to stay for the entire life of process.
3. Steal the utility function in internal namespace. Does not work with msvc (due to missing dllexport) or `gcc -fvisibility=hidden`.

None of them are perfect, except for the last hack that usually works well on Linux.
0.5.0 changes default visibility to hidden and it does not work anymore.

Resolve google#125
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xkszltl commented May 14, 2021

Added decl in logging.h and def in utilities.cc as requested.

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Allow glog to be queried as to whether or not InitGoogleLogging has been called.
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