Control exit-time destructors with new static variable macro #2105
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
falbrechtskirchinger
force-pushed
the
exit-time-dtors
branch
2 times, most recently
from
bea81e3 to
c5360a6
Compare
By making the random engine thread_local, each thread now has its own independent random sequence, ensuring safe concurrent access. Additionally, using an immediately invoked lambda expression to initialize the engine eliminates the need for separate static seed variables.
Introduce macro CPPHTTPLIB_DEFINE_STATIC to define static variables, with optional dynamic allocation to avoid exit-time destructors and race conditions with atexit handlers.
falbrechtskirchinger
force-pushed
the
exit-time-dtors
branch
from
c5360a6 to
6c11aa5
Compare
falbrechtskirchinger
changed the title
|
@falbrechtskirchinger thanks for the pull request. Could you please take a look at my #2097 (comment), and give me your thought? |
|
Closing per our discussion in #2097. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Introduce the
CPPHTTPLIB_DEFINE_STATICmacro to define static variables with optional dynamic allocation, enabled by definingCPPHTTPLIB_NO_EXIT_TIME_DESTRUCTORS. Dynamic allocation prevents running their destructors, which avoids race conditions with atexit handlers that may depend on them. Also includes a test to verify this functionality and updates the documentation to explain the usage and rationale for disabling exit-time destructors.Note: gtest v1.12.1 does not include the fix for exit-time destructors (after finding the last C++11 version, I forgot to re-check that it includes the relevant commit), necessitating compiling gtest separately and without
-Wexit-time-destructors.Resolves #2097.
To do:
std::exitwhile server running or client requests in flight #2097.-Wexit-time-destructors. (Requries: Avoid static std::string #2103 Update vendored gtest to 1.12.1 #2100)