[libc] add simplified tid cache (#101620)

According to discussions on monthly meeting, we probably don't want to
cache `getpid` anymore. glibc removes their cache. bionic is hesitating
whether suc

[libc] add simplified tid cache (#101620)

According to discussions on monthly meeting, we probably don't want to
cache `getpid` anymore. glibc removes their cache. bionic is hesitating
whether such cache is to be removed. `getpid` is async-signal-safe, so
we must make sure it always work.

However, for `gettid`, we have more freedom. Moreover, we are using
`gettid` to examine deadlock such that the performance penalty is not
negligible here. Thus, this patch is separated from previous patch to
provide only `tid` caching. It is much more simplified. Hopefully,
previous build issues can be resolved easily.

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revert all tid changes (#100915)

reland "[libc] implement cached process/thread identity (#98989)" (#99765)

Revert "[libc] implement cached process/thread identity" (#99559)

Reverts llvm/llvm-project#98989

[libc] implement cached process/thread identity (#98989)

migrated from https://github.com/llvm/llvm-project/pull/95965 due to
corrupted git history

[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98597)

This is a part of #97655.

Revert "[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration" (#98593)

Reverts llvm/llvm-project#98075

bots are broken

[libc] Migrate to using LIBC_NAMESPACE_DECL for namespace declaration (#98075)

This is a part of #97655.

[libc] Mass replace enclosing namespace (#67032)

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][cleanup] Fix most conversion warnings

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 wh

[libc][cleanup] Fix most conversion warnings

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

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[libc][NFC] Standardize missing syscalls error messages.

This patch standardizes the error messages when a syscall is not
available to be in the format: "ABC and DEF syscalls are not available."

Re

[libc][NFC] Standardize missing syscalls error messages.

This patch standardizes the error messages when a syscall is not
available to be in the format: "ABC and DEF syscalls are not available."

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D148373

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[libc] Enable __llvm_libc_syscall and fork

This patch enables the remaining calls from unistd.

The test cases had to be updated to:
1. Use SYS_symlinkat if SYS_symlink is not available
2. Use SYS_r

[libc] Enable __llvm_libc_syscall and fork

This patch enables the remaining calls from unistd.

The test cases had to be updated to:
1. Use SYS_symlinkat if SYS_symlink is not available
2. Use SYS_readlinkat if SYS_readlink is not available
3. Use SYS_unlinkat if SYS_unlink is not available
4. Use SYS_openat if SYS_open is not available

We also abort compilation if neither of the syscalls mentioned above are
available.

Differential Revision: https://reviews.llvm.org/D146161

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[libc][obvious] Fix errno includes in unistd

Minor typo swapped quotes for angle brackets. This patch moves
everything to quotes.

Differential Revision: https://reviews.llvm.org/D145188

[libc][NFC] Switch use of errno in src/unistd and src/sys to libc_errno.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D145096

[libc] move fork into threads folder

Fork, as a thread function, should go in the threads folder.
Additionally, it depends on the thread mutex, and it was causing build
issues for targets where we d

[libc] move fork into threads folder

Fork, as a thread function, should go in the threads folder.
Additionally, it depends on the thread mutex, and it was causing build
issues for targets where we don't support threads.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D137867

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[libc] Add implementation of pthread_atfork.

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D135432

[libc] Add a minimal implementation of the POSIX fork function.

A very simple and minimal implementation of fork is added. Future
changes will add more functionality to satisfy POSIX and Linux
requi

[libc] Add a minimal implementation of the POSIX fork function.

A very simple and minimal implementation of fork is added. Future
changes will add more functionality to satisfy POSIX and Linux
requirements.

An implementation of wait and a few support macros in sys/wait.h
have also been added to help with testing the fork function.

Reviewed By: lntue, michaelrj

Differential Revision: https://reviews.llvm.org/D135131

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