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build: use ucontext coroutines instead of pthreads on Linux and arm64 #3

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057b426
build: use ucontext coroutines instead of pthreads on Linux and arm
jbaczuk-qualia Sep 15, 2026
5422b70
chore: bump version to 5.0.6
jbaczuk-qualia Sep 16, 2026
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25 changes: 18 additions & 7 deletions binding.gyp
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Original file line number Diff line number Diff line change
Expand Up @@ -41,24 +41,35 @@
['OS == "linux"',
{
'cflags_c': [ '-std=gnu11' ],
'defines': ['CORO_PTHREAD'],
'variables': {
'USE_MUSL': '<!(ldd --version 2>&1 | head -n1 | grep "musl" | wc -l)',
},
'conditions': [
['<(USE_MUSL) == 1',
{'defines': ['CORO_ASM', '__MUSL__']},
{'defines': ['CORO_UCONTEXT']}
],
],
},
],
['OS == "solaris" or OS == "sunos" or OS == "freebsd" or OS == "aix"', {'defines': ['CORO_UCONTEXT']}],
['OS == "mac"', {'defines': ['CORO_ASM']}],
['OS == "openbsd"', {'defines': ['CORO_ASM']}],
['target_arch == "arm"',
{
# There's been problems getting real fibers working on arm
'defines': ['CORO_PTHREAD'],
'defines!': ['CORO_UCONTEXT', 'CORO_SJLJ', 'CORO_ASM'],
# ucontext works on 32-bit arm with glibc; the old CORO_PTHREAD fallback made every
# fiber an OS thread and every switch a condvar handoff.
'defines': ['CORO_UCONTEXT', '_XOPEN_SOURCE'],
'defines!': ['CORO_PTHREAD', 'CORO_SJLJ', 'CORO_ASM'],
},
],
['target_arch == "arm64"',
{
# There's been problems getting real fibers working on arm
'defines': ['CORO_PTHREAD'],
'defines!': ['CORO_UCONTEXT', 'CORO_SJLJ', 'CORO_ASM'],
# No prebuilt binaries ship for arm64, so production (Graviton) and arm64 CI/dev
# compile from source. CORO_PTHREAD here cost ~13 us per switch versus ~0.7 us with
# swapcontext, which glibc supports on aarch64.
'defines': ['CORO_UCONTEXT', '_XOPEN_SOURCE'],
'defines!': ['CORO_PTHREAD', 'CORO_SJLJ', 'CORO_ASM'],
},
],
],
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2 changes: 1 addition & 1 deletion package.json
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@@ -1,6 +1,6 @@
{
"name": "fibers",
"version": "5.0.5",
"version": "5.0.6",
"description": "Cooperative multi-tasking for Javascript",
"keywords": [
"fiber",
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