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wasi-libc/stub-pthreads
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R a05277a680
Implement a stub pthreads library for THREAD_MODEL=single (#518) 
~~This patch series first starts with a number of commits stubbing out
functions in the existing `THREAD_model=posix` code. According to "The
Open Group Base Specifications Issue 7, 2018 edition", there are a
number of mandatory functions which have not been provided. There are
also some optional functions that have been partially provided in a
not-useful way (e.g. get but no set function). For these, I have chosen
to clean them up and remove the get functions for consistency.~~ EDIT:
These have been split off into separate PRs and merged.

The remainder of the patches then build up a stub implementation of
pthreads for `THREAD_MODEL=single`. I have done my best to try to make
sure that all functions are as conforming as possible (under the
assumption that another thread cannot ever be launched). This means that
objects such as mutexes and rwlocks actually do update their state and
will correctly fail when locks cannot be acquired.

When an inevitable deadlock occurs, I have chosen to return EDEADLK when
it has been explicitly listed as a permissible return value, and to
invoke `__builtin_trap` otherwise.

I have tested this by rebuilding libc++ with threads enabled and then
smoke-testing Clang/LLVM-on-WASI to make sure that it can compile a
simple program. I have not run any more-extensive conformance testing.

Fixes #501
2024-10-10 09:27:48 -07:00
..
barrier.c Implement a stub pthreads library for THREAD_MODEL=single (#518) 2024-10-10 09:27:48 -07:00
condvar.c Implement a stub pthreads library for THREAD_MODEL=single (#518) 2024-10-10 09:27:48 -07:00
mutex.c Implement a stub pthreads library for THREAD_MODEL=single (#518) 2024-10-10 09:27:48 -07:00
README.md Implement a stub pthreads library for THREAD_MODEL=single (#518) 2024-10-10 09:27:48 -07:00
rwlock.c Implement a stub pthreads library for THREAD_MODEL=single (#518) 2024-10-10 09:27:48 -07:00
spinlock.c Implement a stub pthreads library for THREAD_MODEL=single (#518) 2024-10-10 09:27:48 -07:00
stub-pthreads-emulated.c Implement a stub pthreads library for THREAD_MODEL=single (#518) 2024-10-10 09:27:48 -07:00
stub-pthreads-good.c Implement a stub pthreads library for THREAD_MODEL=single (#518) 2024-10-10 09:27:48 -07:00

README.md

Single-threaded pthreads stubs

The goal of these files is to provide stub implementations of pthreads functions for THREAD_MODEL=single. This implementation should always follow the strict letter of the POSIX specifications. This means that "doing nothing", "always succeeding", etc. are not proper implementations -- these stubs aim for higher conformance than that.

The code that is "more" aligned with the spirit of the POSIX specifications ends up compiled into libc itself. This primarily consists of synchronization primitives (which are implemented to actually track state).

The code that is "less" aligned with the spirit of the specifications (e.g. by "rules-lawyering" and always failing) are built into a library wasi-emulated-pthread.a. The distinction is ultimately made by vibes and a judgement call, not formal criteria.