llvm-project.git/libc/src/__support/threads/linux/callonce.cpp, branch users/nico/python-2 Unnamed repository; edit this file 'description' to name the repository. [libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98597) 2024-07-12T16:28:41+00:00 Petr Hosek phosek@google.com 2024-07-12T16:28:41+00:00 5ff3ff33ff930e4ec49da7910612d8a41eb068cb This is a part of #97655. 
This is a part of #97655.
 Revert "[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration" (#98593) 2024-07-12T07:12:13+00:00 Mehdi Amini joker.eph@gmail.com 2024-07-12T07:12:13+00:00 ce9035f5bd3aa09cbd899489cdbc7f6c18acf1e3 Reverts llvm/llvm-project#98075 bots are broken 
Reverts llvm/llvm-project#98075

bots are broken
 [libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98075) 2024-07-11T19:35:22+00:00 Petr Hosek phosek@google.com 2024-07-11T19:35:22+00:00 3f30effe1bd81fa1b039218a9bfe79c3b03fafad This is a part of #97655. 
This is a part of #97655.
 [libc] inline fast path of callonce (#96226) 2024-06-27T15:48:13+00:00 Schrodinger ZHU Yifan yifanzhu@rochester.edu 2024-06-27T15:48:13+00:00 6d61d83736ca23c336472e7f2bda59b7bb307bba Split from #91572 --------- Co-authored-by: Nick Desaulniers (paternity leave) <nickdesaulniers@users.noreply.github.com> 
Split from #91572

---------

Co-authored-by: Nick Desaulniers (paternity leave) <nickdesaulniers@users.noreply.github.com>
 [libc] avoid cmpxchg on the fastpath of callonce (#91748) 2024-05-10T15:55:02+00:00 Schrodinger ZHU Yifan yifanzhu@rochester.edu 2024-05-10T15:55:02+00:00 b8f4f39d3d43d348e31fc5709b72e1f51392e52d Avoid `cmpxchg` operation if the function has already been called. The destination operand of `cmpxchg` may receive a write cycle without regard to the result of the comparison 
Avoid `cmpxchg` operation if the function has already been called.
The destination operand of `cmpxchg` may receive a write cycle without
regard to the result of the comparison
 [libc] clean up futex usage (#91163) 2024-05-07T14:47:41+00:00 Schrodinger ZHU Yifan yifanzhu@rochester.edu 2024-05-07T14:47:41+00:00 ab3a9e724d87a4272782f76b90fb0872a6a86939 # Motivation Futex syscalls are widely used in our codebase as synchronization mechanism. Hence, it may be worthy to abstract out the most common routines (wait and wake). On the other hand, C++20 also provides `std::atomic_notify_one/std::atomic_wait/std::atomic_notify_all` which align with such functionalities. This PR introduces `Futex` as a subtype of `cpp::Atomic<FutexWordType>` with additional `notify_one/notify_all/wait` operations. Providing such wrappers also make future porting easier. For example, FreeBSD's `_umtx_op` and Darwin's `ulock` can be wrapped in a similar manner. ### Similar Examples 1. [bionic futex](https://android.googlesource.com/platform/bionic/+/refs/heads/main/libc/bionic/bionic_futex.cpp) 2. [futex in Rust's std](https://github.com/rust-lang/rust/blob/8cef37dbb67e9c80702925f19cf298c4203991e4/library/std/src/sys/pal/unix/futex.rs#L21) 
# Motivation

Futex syscalls are widely used in our codebase as synchronization
mechanism. Hence, it may be worthy to abstract out the most common
routines (wait and wake). On the other hand, C++20 also provides
`std::atomic_notify_one/std::atomic_wait/std::atomic_notify_all` which
align with such functionalities. This PR introduces `Futex` as a subtype
of `cpp::Atomic<FutexWordType>` with additional
`notify_one/notify_all/wait` operations.

Providing such wrappers also make future porting easier. For example,
FreeBSD's `_umtx_op` and Darwin's `ulock` can be wrapped in a similar
manner.

### Similar Examples

1. [bionic
futex](https://android.googlesource.com/platform/bionic/+/refs/heads/main/libc/bionic/bionic_futex.cpp)
2. [futex in Rust's
std](https://github.com/rust-lang/rust/blob/8cef37dbb67e9c80702925f19cf298c4203991e4/library/std/src/sys/pal/unix/futex.rs#L21)
 [libc] Add C23 limits.h header. (#78887) 2024-01-24T21:08:56+00:00 lntue 35648136+lntue@users.noreply.github.com 2024-01-24T21:08:56+00:00 72ce6294157964042b7ed5576ce2c99257eeea9d 






[libc] Mass replace enclosing namespace (#67032)
2023-09-26T09:45:04+00:00

Guillaume Chatelet
gchatelet@google.com

2023-09-26T09:45:04+00:00

b6bc9d72f65a5086f310f321e969d96e9a559e75

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




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






[libc] Fix the remaining old style includes
2023-08-29T05:35:05+00:00

Petr Hosek
phosek@google.com

2023-08-29T05:32:59+00:00

f6259d9b9a546dbfa5bc2f29313c6edd6c701177

These were omitted from previous cleanup changes.

Differential Revision: https://reviews.llvm.org/D159066





These were omitted from previous cleanup changes.

Differential Revision: https://reviews.llvm.org/D159066







[libc][cleanup] Fix most conversion warnings
2023-08-07T22:03:01+00:00

Michael Jones
michaelrj@google.com

2023-08-02T23:30:26+00:00

f0a3954ef1af274cb0b79a6e0bc51a31e0de540b

This patch is large, but is almost entirely just adding casts to calls
to syscall_impl. Much of the work was done programatically, with human
checking when the syntax or types got confusing.

Reviewed By: mcgrathr

Differential Revision: https://reviews.llvm.org/D156950





This patch is large, but is almost entirely just adding casts to calls
to syscall_impl. Much of the work was done programatically, with human
checking when the syntax or types got confusing.

Reviewed By: mcgrathr

Differential Revision: https://reviews.llvm.org/D156950