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[3.12] gh-101538: Add experimental wasi-threads build (GH-101537)#106834

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
Add experimental wasi-threads support. Patch by Takashi Yamamoto.
8 changes: 8 additions & 0 deletionsPython/thread_pthread.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -356,7 +356,15 @@ PyThread_exit_thread(void)
{
if (!initialized)
exit(0);
#if defined(__wasi__)
/*
* wasi-threads doesn't have pthread_exit right now
* cf. https://github.com/WebAssembly/wasi-threads/issues/7
*/
abort();
#else
pthread_exit(0);
#endif
}

#ifdef USE_SEMAPHORES
Expand Down
8 changes: 7 additions & 1 deletionTools/wasm/wasm_build.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -480,7 +480,6 @@ def configure_cmd(self) -> List[str]:
cmd.append(f"--{opt}-wasm-dynamic-linking")

if self.pthreads is not None:
assert self.host.is_emscripten
opt = "enable" if self.pthreads else "disable"
cmd.append(f"--{opt}-wasm-pthreads")

Expand DownExpand Up@@ -745,6 +744,13 @@ def build_emports(self, force: bool = False):
support_level=SupportLevel.supported,
host=Host.wasm32_wasi,
),
# wasm32-wasi-threads
BuildProfile(
"wasi-threads",
support_level=SupportLevel.experimental,
host=Host.wasm32_wasi,
pthreads=True,
),
# no SDK available yet
# BuildProfile(
# "wasm64-wasi",
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21 changes: 20 additions & 1 deletionconfigure
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Some generated files are not rendered by default. Learn more abouthow customized files appear on GitHub.

18 changes: 17 additions & 1 deletionconfigure.ac
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Original file line numberDiff line numberDiff line change
Expand Up@@ -1079,7 +1079,11 @@ cat > conftest.c <<EOF
# if defined(__EMSCRIPTEN__)
wasm32-emscripten
# elif defined(__wasi__)
# if defined(_REENTRANT)
wasm32-wasi-threads
# else
wasm32-wasi
# endif
# else
# error unknown wasm32 platform
# endif
Expand DownExpand Up@@ -1272,7 +1276,7 @@ AC_ARG_ENABLE([wasm-pthreads],
[
AS_CASE([$ac_sys_system],
[Emscripten], [],
[WASI], [AC_MSG_ERROR([WASI threading is not implemented yet.])],
[WASI], [],
[AC_MSG_ERROR([--enable-wasm-pthreads only applies to Emscripten and WASI])]
)
], [
Expand DownExpand Up@@ -2309,6 +2313,18 @@ AS_CASE([$ac_sys_system],
LIBS="$LIBS -lwasi-emulated-signal -lwasi-emulated-getpid -lwasi-emulated-process-clocks"
echo "#define _WASI_EMULATED_SIGNAL 1" >> confdefs.h

AS_VAR_IF([enable_wasm_pthreads], [yes], [
# Note: update CFLAGS because ac_compile/ac_link needs this too.
# without this, configure fails to find pthread_create, sem_init,
# etc because they are only available in the sysroot for
# wasm32-wasi-threads.
AS_VAR_APPEND([CFLAGS], [" -target wasm32-wasi-threads -pthread"])
AS_VAR_APPEND([CFLAGS_NODIST], [" -target wasm32-wasi-threads -pthread"])
AS_VAR_APPEND([LDFLAGS_NODIST], [" -target wasm32-wasi-threads -pthread"])
AS_VAR_APPEND([LDFLAGS_NODIST], [" -Wl,--import-memory"])
AS_VAR_APPEND([LDFLAGS_NODIST], [" -Wl,--max-memory=10485760"])
])

dnl increase initial memory and stack size, move stack first
dnl https://github.com/WebAssembly/wasi-libc/issues/233
AS_VAR_APPEND([LDFLAGS_NODIST], [" -z stack-size=524288 -Wl,--stack-first -Wl,--initial-memory=10485760"])
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