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cosmopolitan/third_party/nsync
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Justine Tunney 751d20d98d
Fix nsync_mu_unlock_slow_() on Apple Silicon 
We torture test dlmalloc() in test/libc/stdio/memory_test.c. That test
was crashing on occasion on Apple M1 microprocessors when dlmalloc was
using *NSYNC locks. It was relatively easy to spot the cause, which is
this one particular compare and swap operation, which needed to change
to use sequentially-consistent ordering rather than an acquire barrier
2023-11-13 11:07:13 -08:00
..
mem Use dynamic memory for *NSYNC waiters 2023-11-10 01:42:06 -08:00
testing Make improvements 2023-09-18 21:04:47 -07:00
array.internal.h Clean up some sleep code 2022-10-08 03:00:48 -07:00
atomic.h Make some more fixes 2023-10-09 12:22:00 -07:00
atomic.internal.h Fix nsync_mu_unlock_slow_() on Apple Silicon 2023-11-13 11:07:13 -08:00
common.c Iterate more on recent changes 2023-11-11 00:28:22 -08:00
common.internal.h Iterate more on recent changes 2023-11-11 00:28:22 -08:00
compat.S Make improvements 2023-06-15 14:50:53 -07:00
counter.h Clean up more code 2023-07-06 08:03:24 -07:00
cv.h Clean up more code 2023-07-06 08:03:24 -07:00
debug.h Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
futex.c Make win32 i/o signals atomic and longjmp() safe 2023-11-04 20:33:29 -07:00
futex.internal.h Fix warnings 2023-09-01 20:50:18 -07:00
heap.internal.h Clean up some sleep code 2022-10-08 03:00:48 -07:00
LICENSE.txt Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
mu.c Fix nsync_mu_unlock_slow_() on Apple Silicon 2023-11-13 11:07:13 -08:00
mu.h Clean up more code 2023-07-06 08:03:24 -07:00
mu_semaphore.c Iterate more on recent changes 2023-11-11 00:28:22 -08:00
mu_semaphore.h Iterate more on recent changes 2023-11-11 00:28:22 -08:00
mu_semaphore.internal.h Iterate more on recent changes 2023-11-11 00:28:22 -08:00
mu_semaphore_futex.c Make improvements 2023-09-18 21:04:47 -07:00
mu_semaphore_gcd.c Iterate more on recent changes 2023-11-11 00:28:22 -08:00
mu_semaphore_sem.c Iterate more on recent changes 2023-11-11 00:28:22 -08:00
mu_wait.h Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
note.h Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
nsync.mk Make improvements 2023-09-18 21:04:47 -07:00
once.h Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
panic.c Iterate more on recent changes 2023-11-11 00:28:22 -08:00
races.internal.h Add *NSYNC mu_test 2022-09-11 18:56:29 -07:00
README.cosmo Fix nsync_mu_unlock_slow_() on Apple Silicon 2023-11-13 11:07:13 -08:00
README.md Add *NSYNC to libc/isystem 2022-09-13 01:47:12 -07:00
time.h Improve cancellations, randomness, and time 2022-11-05 23:45:32 -07:00
wait_s.internal.h Use dynamic memory for *NSYNC waiters 2023-11-10 01:42:06 -08:00
waiter.h Use *NSYNC for POSIX threads locking APIs 2022-09-11 11:04:50 -07:00
yield.c Make improvements 2023-09-18 21:04:47 -07:00

README.md

*NSYNC

*NSYNC is a library providing scalable synchronization primitives. The following packages are provided:

  • THIRD_PARTY_NSYNC has nsync_mu which doesn't depend on malloc().
  • THIRD_PARTY_NSYNC_MEM has the rest of *NSYNC, e.g. nsync_cv.

The origin of this code is here:

git@github.com:google/nsync
ac5489682760393fe21bd2a8e038b528442412a7 (1.25.0)
Author: Mike Burrows <m3b@google.com>
Date:   Wed Jun 1 16:47:52 2022 -0700

NSYNC uses the Apache 2.0 license. We made the following local changes:

  • Write custom nsync_malloc_() so malloc() can use *NSYNC.

  • Rewrite futex() wrapper to support old Linux kernels and OpenBSD.

  • Normalize sources to Cosmopolitan style conventions; *NSYNC upstream supports dozens of compilers and operating systems, at compile-time. Since Cosmo solves portability at runtime instead, most of the build config toil has been removed, in order to help the NSYNC source code be more readable and hackable.