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Support for WASI threads #98120

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Support for WASI threads #98120

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6a88a5c
Add support for WASI threads
Milek7 Feb 6, 2024
06d5061
Patch csproj conditionals to work with WASI threads
Milek7 Feb 6, 2024
c48c6ab
Fix pthread linking for WasmBuildNative
Milek7 Mar 19, 2024
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22 changes: 14 additions & 8 deletions eng/native/gen-buildsys.cmd
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ set __Arch=%4
set __Os=%5
set __CmakeGenerator=Visual Studio
set __UseEmcmake=0
set __Pthreads=0
if /i "%__Ninja%" == "1" (
set __CmakeGenerator=Ninja
) else (
Expand All @@ -37,6 +38,14 @@ if /i "%__Ninja%" == "1" (
)
)

:loop
if [%6] == [] goto end_loop
if ""%6"" == """-DCMAKE_USE_PTHREADS=1""" set __Pthreads=1
set __ExtraCmakeParams=%__ExtraCmakeParams% %6
shift
goto loop
:end_loop

if /i "%__Arch%" == "wasm" (

if "%__Os%" == "" (
Expand Down Expand Up @@ -72,19 +81,16 @@ if /i "%__Arch%" == "wasm" (
set "WASI_SDK_PATH=!WASI_SDK_PATH:\=/!"
if not "!WASI_SDK_PATH:~-1!" == "/" set "WASI_SDK_PATH=!WASI_SDK_PATH!/"
set __CmakeGenerator=Ninja
set __ExtraCmakeParams=%__ExtraCmakeParams% -DCLR_CMAKE_TARGET_OS=wasi -DCLR_CMAKE_TARGET_ARCH=wasm "-DWASI_SDK_PREFIX=!WASI_SDK_PATH!" "-DCMAKE_TOOLCHAIN_FILE=!WASI_SDK_PATH!/share/cmake/wasi-sdk.cmake" "-DCMAKE_SYSROOT=!WASI_SDK_PATH!/share/wasi-sysroot"
if "%__Pthreads%" == "1" (
set __ExtraCmakeParams=%__ExtraCmakeParams% -DCLR_CMAKE_TARGET_OS=wasi -DCLR_CMAKE_TARGET_ARCH=wasm "-DWASI_SDK_PREFIX=!WASI_SDK_PATH!" "-DCMAKE_TOOLCHAIN_FILE=!WASI_SDK_PATH!/share/cmake/wasi-sdk-pthread.cmake" "-DCMAKE_SYSROOT=!WASI_SDK_PATH!/share/wasi-sysroot"
) else (
set __ExtraCmakeParams=%__ExtraCmakeParams% -DCLR_CMAKE_TARGET_OS=wasi -DCLR_CMAKE_TARGET_ARCH=wasm "-DWASI_SDK_PREFIX=!WASI_SDK_PATH!" "-DCMAKE_TOOLCHAIN_FILE=!WASI_SDK_PATH!/share/cmake/wasi-sdk.cmake" "-DCMAKE_SYSROOT=!WASI_SDK_PATH!/share/wasi-sysroot"
)
)
) else (
set __ExtraCmakeParams=%__ExtraCmakeParams% "-DCMAKE_SYSTEM_VERSION=10.0"
)

:loop
if [%6] == [] goto end_loop
set __ExtraCmakeParams=%__ExtraCmakeParams% %6
shift
goto loop
:end_loop

set __ExtraCmakeParams="-DCMAKE_INSTALL_PREFIX=%__CMakeBinDir%" "-DCLR_CMAKE_HOST_ARCH=%__Arch%" %__ExtraCmakeParams%

set __CmdLineOptionsUpToDateFile=%__IntermediatesDir%\cmake_cmd_line.txt
Expand Down
21 changes: 17 additions & 4 deletions src/mono/CMakeLists.txt
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Expand Up @@ -153,6 +153,10 @@ if(NOT AOT_TARGET_TRIPLE STREQUAL "")
elseif(AOT_TARGET_TRIPLE STREQUAL "wasm32-unknown-wasi")
set(TARGET_SYSTEM_NAME "wasi")
set(TARGET_ARCH "wasm")
elseif(AOT_TARGET_TRIPLE STREQUAL "wasm32-unknown-wasi-threads")
set(TARGET_SYSTEM_NAME "wasi")
set(TARGET_SYSTEM_VARIANT "threads")
set(TARGET_ARCH "wasm")
elseif(AOT_TARGET_TRIPLE STREQUAL "x86_64-none-linux-android")
set(TARGET_SYSTEM_NAME "android")
set(TARGET_ARCH "x86_64")
Expand Down Expand Up @@ -180,11 +184,17 @@ endif()
# HOST OS CHECKS
######################################

if("${triple}" STREQUAL "wasm32-wasi-threads")
set(CMAKE_SYSTEM_VARIANT "threads")
endif()

message ("CMAKE_SYSTEM_NAME=${CMAKE_SYSTEM_NAME}")
message ("CMAKE_SYSTEM_VARIANT=${CMAKE_SYSTEM_VARIANT}")

set(CLR_CMAKE_HOST_OS ${CMAKE_SYSTEM_NAME})
string(TOLOWER ${CLR_CMAKE_HOST_OS} CLR_CMAKE_HOST_OS)
set(CLR_CMAKE_HOST_VARIANT ${CMAKE_SYSTEM_VARIANT})
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i'm not super familiar with cmake, but it seems weird that the host variant is either threads or not threads depending on the target you're building for. don't all cmake build hosts have threads?

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@Milek7 Milek7 Feb 7, 2024 •
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I think this is referring not to build host but mono runtime host. (as opposed to target system for which runtime will do codegen)
Still, I'm not sure how that interacts with DISABLE_THREADS (shouldn't there be TARGET/HOST_DISABLE_THREADS?), but in any case it was used this way for wasm before.

string(TOLOWER "${CLR_CMAKE_HOST_OS}" CLR_CMAKE_HOST_OS)
string(TOLOWER "${CLR_CMAKE_HOST_VARIANT}" CLR_CMAKE_HOST_VARIANT)

# TODO: check if we can enable this on more platforms
# set(MONO_KEYWORD_THREAD "__thread")
Expand All @@ -195,7 +205,7 @@ if(CLR_CMAKE_HOST_OS STREQUAL "darwin")
set(HOST_OSX 1)
set(PTHREAD_POINTER_ID 1)
set(USE_MACH_SEMA 1)
if(CMAKE_SYSTEM_VARIANT STREQUAL "maccatalyst")
if(CLR_CMAKE_HOST_VARIANT STREQUAL "maccatalyst")
set(HOST_MACCAT 1)
endif()
elseif(CLR_CMAKE_HOST_OS STREQUAL "ios" OR CLR_CMAKE_HOST_OS STREQUAL "tvos")
Expand Down Expand Up @@ -310,14 +320,15 @@ endif()

if(NOT TARGET_SYSTEM_NAME)
set(TARGET_SYSTEM_NAME "${CLR_CMAKE_HOST_OS}")
set(TARGET_SYSTEM_VARIANT "${CLR_CMAKE_HOST_VARIANT}")
endif()

if(TARGET_SYSTEM_NAME STREQUAL "darwin")
set(TARGET_UNIX 1)
set(TARGET_MACH 1)
set(TARGET_OSX 1)
set(TARGET_DARWIN 1)
if(CMAKE_SYSTEM_VARIANT STREQUAL "maccatalyst")
if(TARGET_SYSTEM_VARIANT STREQUAL "maccatalyst")
set(TARGET_MACCAT 1)
endif()
elseif(TARGET_SYSTEM_NAME STREQUAL "ios" OR TARGET_SYSTEM_NAME STREQUAL "tvos")
Expand Down Expand Up @@ -351,7 +362,9 @@ elseif(TARGET_SYSTEM_NAME STREQUAL "emscripten")
endif()
elseif(TARGET_SYSTEM_NAME STREQUAL "wasi")
set(TARGET_WASI 1)
set(DISABLE_THREADS 1)
if (NOT (TARGET_SYSTEM_VARIANT STREQUAL "threads"))
set(DISABLE_THREADS 1)
endif()
if (CMAKE_BUILD_TYPE STREQUAL "Release")
add_compile_options(-Os)
endif()
Expand Down
6 changes: 3 additions & 3 deletions src/mono/System.Private.CoreLib/System.Private.CoreLib.csproj
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Expand Up @@ -126,7 +126,7 @@
<FeatureWasmPerfTracing Condition="('$(TargetsBrowser)' == 'true' or '$(TargetsWasi)' == 'true') and ('$(WasmEnableThreads)' == 'true')">true</FeatureWasmPerfTracing>
<FeaturePortableTimer Condition="('$(TargetsBrowser)' != 'true' and '$(TargetsWasi)' != 'true') or '$(FeatureWasmManagedThreads)' == 'true'">true</FeaturePortableTimer>
<FeaturePortableThreadPool Condition="('$(TargetsBrowser)' != 'true' and '$(TargetsWasi)' != 'true') or '$(FeatureWasmManagedThreads)' == 'true'">true</FeaturePortableThreadPool>
<FeaturePerfTracing Condition="('$(TargetsBrowser)' != 'true' and '$(TargetsWasi)' != 'true') or '$(FeatureWasmPerftracing)' == 'true'">true</FeaturePerfTracing>
<FeaturePerfTracing Condition="('$(TargetsBrowser)' != 'true' and '$(TargetsWasi)' != 'true') or ('$(TargetsBrowser)' == 'true' and '$(FeatureWasmPerftracing)' == 'true')">true</FeaturePerfTracing>
<FeatureObjCMarshal Condition="'$(TargetsOSX)' == 'true' or '$(TargetsMacCatalyst)' == 'true' or '$(TargetsiOS)' == 'true' or '$(TargetstvOS)' == 'true'">true</FeatureObjCMarshal>
</PropertyGroup>

Expand Down Expand Up @@ -274,7 +274,7 @@
<ItemGroup Condition="('$(TargetsUnix)' == 'true' or '$(TargetsBrowser)' == 'true' or '$(TargetsWasi)' == 'true') and '$(FeaturePortableThreadPool)' == 'true'">
<Compile Include="$(BclSourcesRoot)\System\Threading\LowLevelLifoSemaphore.Unix.Mono.cs" />
</ItemGroup>
<ItemGroup Condition="('$(TargetsBrowser)' == 'true' or '$(TargetsWasi)' == 'true') and '$(FeatureWasmManagedThreads)' == 'true'">
<ItemGroup Condition="'$(TargetsBrowser)' == 'true' and '$(FeatureWasmManagedThreads)' == 'true'">
<Compile Include="$(BclSourcesRoot)\System\Threading\ThreadPoolBoundHandle.Browser.Threads.Mono.cs" />
<Compile Include="$(BclSourcesRoot)\System\Threading\LowLevelLifoAsyncWaitSemaphore.Browser.Threads.Mono.cs" />
<Compile Include="$(BclSourcesRoot)\System\Threading\PortableThreadPool.Browser.Threads.Mono.cs" />
Expand All @@ -288,7 +288,7 @@
<Compile Include="$(BclSourcesRoot)\System\Threading\ThreadPool.Browser.Mono.cs" />
<Compile Include="$(BclSourcesRoot)\System\Threading\TimerQueue.Browser.Mono.cs" />
</ItemGroup>
<ItemGroup Condition="'$(TargetsWasi)' == 'true'">
<ItemGroup Condition="'$(TargetsWasi)' == 'true' and '$(FeatureWasmManagedThreads)' != 'true'">
<Compile Include="$(BclSourcesRoot)\System\Threading\ThreadPoolBoundHandle.Browser.Mono.cs" />
<Compile Include="$(BclSourcesRoot)\System\Threading\PreAllocatedOverlapped.Browser.Mono.cs" />
<Compile Include="$(BclSourcesRoot)\System\Threading\ThreadPool.Wasi.Mono.cs" />
Expand Down
7 changes: 5 additions & 2 deletions src/mono/mono.proj
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Expand Up @@ -59,6 +59,7 @@
<PropertyGroup>
<MonoThreadSuspend Condition="'$(TargetswatchOS)' == 'true' and '$(MonoThreadSuspend)' == ''">coop</MonoThreadSuspend>
<MonoThreadSuspend Condition="'$(TargetsBrowser)' == 'true' and '$(WasmEnableThreads)' == 'true' and '$(MonoThreadSuspend)' == ''">coop</MonoThreadSuspend>
<MonoThreadSuspend Condition="'$(TargetsWasi)' == 'true' and '$(WasmEnableThreads)' == 'true' and '$(MonoThreadSuspend)' == ''">coop</MonoThreadSuspend>
<!-- wasm isn't really preemptive, but we don't want safepoints -->
<MonoThreadSuspend Condition="( '$(TargetsBrowser)' == 'true' or '$(TargetsWasi)' == 'true' ) and '$(MonoThreadSuspend)' == ''">preemptive</MonoThreadSuspend>
<!-- all other platforms -->
Expand Down Expand Up @@ -602,7 +603,8 @@
<_MonoCMakeConfigureCommand>cmake @(_MonoCMakeArgs, ' ') $(MonoCMakeExtraArgs) &quot;$(MonoProjectRoot.TrimEnd('\/'))&quot;</_MonoCMakeConfigureCommand>
<_MonoCMakeConfigureCommand Condition="'$(TargetsBrowser)' != 'true' and '$(TargetsWasi)' != 'true' and '$(_MonoSkipInitCompiler)' != 'true' and '$(HostOS)' != 'windows'">sh -c 'build_arch=&quot;$(_CompilerTargetArch)&quot; compiler=&quot;$(MonoCCompiler)&quot; . &quot;$(RepositoryEngineeringCommonDir)native/init-compiler.sh&quot; &amp;&amp; @(_MonoBuildEnv, ' ') $(_MonoCMakeConfigureCommand)'</_MonoCMakeConfigureCommand>
<_MonoCMakeConfigureCommand Condition="'$(TargetsBrowser)' != 'true' and '$(TargetsWasi)' != 'true' and '$(_MonoSkipInitCompiler)' == 'true' and '$(HostOS)' != 'windows'">$(_MonoCCOption) $(_MonoCXXOption) @(_MonoBuildEnv, ' ') $(_MonoCMakeConfigureCommand)</_MonoCMakeConfigureCommand>
<_MonoCMakeConfigureCommand Condition="'$(TargetsWasi)' == 'true'">$(_MonoCMakeConfigureCommand) -DWASI_SDK_PREFIX=$(WASI_SDK_PATH) -DCMAKE_SYSROOT=$(WASI_SDK_PATH)share/wasi-sysroot -DCMAKE_TOOLCHAIN_FILE=$(WASI_SDK_PATH)share/cmake/wasi-sdk.cmake -DCMAKE_CXX_FLAGS="--sysroot=$(WASI_SDK_PATH)share/wasi-sysroot"</_MonoCMakeConfigureCommand>
<_MonoCMakeConfigureCommand Condition="'$(TargetsWasi)' == 'true' and '$(WasmEnableThreads)' != 'true'">$(_MonoCMakeConfigureCommand) -DWASI_SDK_PREFIX=$(WASI_SDK_PATH) -DCMAKE_SYSROOT=$(WASI_SDK_PATH)share/wasi-sysroot -DCMAKE_TOOLCHAIN_FILE=$(WASI_SDK_PATH)share/cmake/wasi-sdk.cmake -DCMAKE_CXX_FLAGS="--sysroot=$(WASI_SDK_PATH)share/wasi-sysroot"</_MonoCMakeConfigureCommand>
<_MonoCMakeConfigureCommand Condition="'$(TargetsWasi)' == 'true' and '$(WasmEnableThreads)' == 'true'">$(_MonoCMakeConfigureCommand) -DWASI_SDK_PREFIX=$(WASI_SDK_PATH) -DCMAKE_SYSROOT=$(WASI_SDK_PATH)share/wasi-sysroot -DCMAKE_TOOLCHAIN_FILE=$(WASI_SDK_PATH)share/cmake/wasi-sdk-pthread.cmake -DCMAKE_CXX_FLAGS="--sysroot=$(WASI_SDK_PATH)share/wasi-sysroot"</_MonoCMakeConfigureCommand>

<_MonoCMakeConfigureCommand Condition="'$(TargetsBrowser)' != 'true' and '$(TargetsWasi)' != 'true' and '$(HostOS)' == 'windows'">call &quot;$(RepositoryEngineeringDir)native\init-vs-env.cmd&quot; $(_CompilerTargetArch) &amp;&amp; cd /D &quot;$(MonoObjDir)&quot; &amp;&amp; @(_MonoBuildEnv, ' ') $(_MonoCMakeConfigureCommand)</_MonoCMakeConfigureCommand>
<_MonoCMakeConfigureCommand Condition="'$(TargetsBrowser)' == 'true' and '$(HostOS)' != 'windows'">bash -c 'source $(EMSDK_PATH)/emsdk_env.sh 2>&amp;1 &amp;&amp; emcmake $(_MonoCMakeConfigureCommand)'</_MonoCMakeConfigureCommand>
Expand Down Expand Up @@ -724,7 +726,8 @@
<PropertyGroup Condition="'$(TargetsBrowser)' == 'true' or '$(TargetsWasi)' == 'true'">
<MonoUseCrossTool>true</MonoUseCrossTool>
<MonoAotAbi Condition="'$(TargetsBrowser)' == 'true'">wasm32-unknown-none</MonoAotAbi>
<MonoAotAbi Condition="'$(TargetsWasi)' == 'true'">wasm32-unknown-wasi</MonoAotAbi>
<MonoAotAbi Condition="'$(TargetsWasi)' == 'true' and $(WasmEnableThreads) != 'true'">wasm32-unknown-wasi</MonoAotAbi>
<MonoAotAbi Condition="'$(TargetsWasi)' == 'true' and $(WasmEnableThreads) == 'true'">wasm32-unknown-wasi-threads</MonoAotAbi>
<MonoAotOffsetsFile>$(MonoObjCrossDir)offsets-wasm32-unknown-none.h</MonoAotOffsetsFile>
<MonoLibClang Condition="$([MSBuild]::IsOSPlatform('OSX'))">$(MonoLLVMDir)/$(BuildArchitecture)/lib/libclang.dylib</MonoLibClang>
<MonoLibClang Condition="$([MSBuild]::IsOSPlatform('Linux'))">$(MonoLLVMDir)/$(BuildArchitecture)/lib/libclang.so</MonoLibClang>
Expand Down
6 changes: 3 additions & 3 deletions src/mono/mono/component/diagnostics_server.c
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Expand Up @@ -7,7 +7,7 @@
#include <mono/utils/mono-publib.h>
#include <mono/utils/mono-compiler.h>
#include <eventpipe/ds-server.h>
#if defined (HOST_WASM) && !defined(HOST_WASI)
#if defined(HOST_BROWSER)
#include <eventpipe/ep-ipc-stream.h>
#include <mono/component/event_pipe-wasm.h>
#include <mono/utils/mono-coop-semaphore.h>
Expand All @@ -19,7 +19,7 @@
static bool
diagnostics_server_available (void);

#if !defined (HOST_WASM) || defined (DISABLE_THREADS)
#if !defined(HOST_BROWSER) || defined (DISABLE_THREADS)
static MonoComponentDiagnosticsServer fn_table = {
{ MONO_COMPONENT_ITF_VERSION, &diagnostics_server_available },
&ds_server_init,
Expand Down Expand Up @@ -350,7 +350,7 @@ wasm_ipc_stream_close (void *self)
return r == 0;
}

#endif /* !defined (HOST_WASM) || defined (DISABLE_THREADS) */
#endif /* !defined (HOST_BROWSER) || defined (DISABLE_THREADS) */

static bool
diagnostics_server_available (void)
Expand Down
2 changes: 1 addition & 1 deletion src/mono/mono/metadata/gc.c
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Expand Up @@ -691,7 +691,7 @@ mono_gc_finalize_notify (void)
if (mono_gc_is_null ())
return;

#if defined(HOST_WASI)
#if defined(HOST_WASI) && defined(DISABLE_THREADS)
// TODO: Schedule the background job on WASI. Threads aren't yet supported in this build.
#elif defined(HOST_WASM) && defined(DISABLE_THREADS)
mono_main_thread_schedule_background_job (mono_runtime_do_background_work);
Expand Down
2 changes: 1 addition & 1 deletion src/mono/mono/metadata/sgen-mono.c
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Expand Up @@ -2893,7 +2893,7 @@ sgen_client_binary_protocol_collection_end (int minor_gc_count, int generation,
MONO_PROFILER_RAISE (gc_event, (MONO_GC_EVENT_END, generation, generation == GENERATION_OLD && sgen_concurrent_collection_in_progress));
}

#if defined(HOST_WASM) && defined(DISABLE_THREADS)
#if defined(HOST_BROWSER) && defined(DISABLE_THREADS)
void
sgen_client_schedule_background_job (void (*cb)(void))
{
Expand Down
9 changes: 8 additions & 1 deletion src/mono/mono/metadata/threads.c
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Expand Up @@ -1286,8 +1286,11 @@ start_wrapper (gpointer data)
}

mono_thread_info_exit (res);

#ifdef HOST_WASI
return (mono_thread_start_return_t)res;
#else
g_assert_not_reached ();
#endif
}

static void
Expand Down Expand Up @@ -1754,6 +1757,8 @@ mono_thread_exit (void)
exit (mono_environment_exitcode_get ());

mono_thread_info_exit (0);

g_assert_not_reached ();
}

MonoThread *
Expand Down Expand Up @@ -2889,6 +2894,8 @@ mono_threads_set_shutting_down (void)

/* Wake up other threads potentially waiting for us */
mono_thread_info_exit (0);

g_assert_not_reached ();
} else {
shutting_down = TRUE;

Expand Down
4 changes: 3 additions & 1 deletion src/mono/mono/mini/mini-wasm.h
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Expand Up @@ -91,8 +91,10 @@ typedef struct {
#define MONO_ARCH_HAS_REGISTER_ICALL 1
#define MONO_ARCH_HAVE_SDB_TRAMPOLINES 1
#define MONO_ARCH_LLVM_TARGET_LAYOUT "e-m:e-p:32:32-i64:64-n32:64-S128"
#ifdef TARGET_WASI
#if defined(TARGET_WASI) && defined(DISABLE_THREADS)
#define MONO_ARCH_LLVM_TARGET_TRIPLE "wasm32-unknown-wasi"
#elif defined(TARGET_WASI)
#define MONO_ARCH_LLVM_TARGET_TRIPLE "wasm32-unknown-wasi-threads"
#else
#define MONO_ARCH_LLVM_TARGET_TRIPLE "wasm32-unknown-emscripten"
#endif
Expand Down
6 changes: 4 additions & 2 deletions src/mono/mono/utils/mono-threads-posix.c
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Expand Up @@ -32,7 +32,7 @@

#include <errno.h>

#if defined(_POSIX_VERSION) && !defined (HOST_WASM)
#if defined(_POSIX_VERSION) && !defined (USE_WASM_BACKEND)

#include <pthread.h>

Expand Down Expand Up @@ -127,11 +127,13 @@ mono_threads_platform_yield (void)
return sched_yield () == 0;
}

#ifndef USE_PTHREAD_WASM_BACKEND
void
mono_threads_platform_exit (gsize exit_code)
{
pthread_exit ((gpointer) exit_code);
}
#endif

gboolean
mono_thread_platform_external_eventloop_keepalive_check (void)
Expand All @@ -142,7 +144,7 @@ mono_thread_platform_external_eventloop_keepalive_check (void)
return FALSE;
}

#if HOST_FUCHSIA
#if defined(HOST_FUCHSIA) || !defined(HAVE_GETRLIMIT)
int
mono_thread_info_get_system_max_stack_size (void)
{
Expand Down
13 changes: 13 additions & 0 deletions src/mono/mono/utils/mono-threads-wasi.S
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Expand Up @@ -13,3 +13,16 @@ get_wasm_heap_base:
.functype get_wasm_heap_base () -> (i32)
global.get __heap_base@GOT
end_function

.globl get_wasm_stack_low
.globl get_wasm_stack_high

get_wasm_stack_low:
.functype get_wasm_stack_low () -> (i32)
global.get __stack_low@GOT
end_function

get_wasm_stack_high:
.functype get_wasm_stack_high () -> (i32)
global.get __stack_high@GOT
end_function
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