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The call chain to `Mutex:lock` can be polluted by stack protector. For
completely safe, let's postpone the main TLS tearing down to a separate
phase.
fix #108030
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Summary:
This file is an object library, but uses the `LIBC_COPT_PUBLIC_PACKAING`
option. This will always be undefined which leads to a type mismatch
when uses actually try to link against it. This patch simply removes
this and turns it into a header only library. This means that the
implementations of the callback lists and the mutexes need to live in
their respective files. The result is that `atexit` needs to be defined
for `at_quick_exit` to be valid.
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This is a part of #97655.
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declaration" (#98593)
Reverts llvm/llvm-project#98075
bots are broken
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This is a part of #97655.
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- added at_quick_exit function
- used helper file exit_handler which reuses code from atexit
- atexit now calls helper functions from exit_handler
- test cases and dependencies are added
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Co-authored-by: Aaryan Shukla <aaryanshukla@google.com>
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This PR address issue #89002.
#### Changes in this PR
* Added a simple implementation of `cpp::lock_guard` (an equivalent of
`std::lock_guard`) in libc/src/__support/CPP inspired by the libstdc++
implementation
* Added tests for `cpp::lock_guard` in
/libc/test/src/__support/CPP/mutex_test.cpp
* Replaced all references to `MutexLock` with `cpp::lock_guard`
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Co-authored-by: Guillaume Chatelet <gchatelet@google.com>
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I'm trying to break up the pieces of supporting __cxa_finalize into smaller
commits. Provide this symbol first, and make use of it from exit.
Next will be to store __dso_handle, then finally to only run callbacks that
were registered from a specific dso.
Link: #85651
Link: https://itanium-cxx-abi.github.io/cxx-abi/abi.html#dso-dtor
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The cpp namespace should only be used to mirror APIs from C++'s std::
namespace
(at least until we share more code with libc++, see
https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701)
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Summary:
The GPU backends have restrictions on the kinds of initializers they can
produce. The use of BlockStore here currently breaks the backends
through the use of recursive initializers. This prevents it from
actually being included in any builds. This patchs changes it to just
use a fixed size of 64 slots .The chances of someone exceeding the 64
slots in practice is very, very low.
However, this is primarily a bandaid solution as a real solution will
need to use a lock free data structure to push work in parallel.
Currently the mutexes on the GPU build do nothing, so they only work if
the user guards the use themselves.
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This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079
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Rename preprocessor definitions that control tuning of llvm libc.
Differential Revision: https://reviews.llvm.org/D143913
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Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D140459
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Reviewed By: abrachet
Differential Revision: https://reviews.llvm.org/D131219
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atexit handler
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The new container is used to store atexit callbacks. This way, we avoid
the possibility of the destructor of the container itself getting added
as an at exit callback.
Reviewed By: abrachet
Differential Revision: https://reviews.llvm.org/D121350
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Reviewed By: abrachet
Differential Revision: https://reviews.llvm.org/D121334
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Often atexit is implemented using __cxa_atexit. I have not implemented __cxa_atexit here because it potentially requires more discussion. It is unique for llvm-libc (I think) that it is an exported symbol that wouldn’t be defined in any spec file because it doesn’t have a header. Implementing it will be trivial given what is here already, but I figured it would be more contentious so it can be implemented later.
Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D119512
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