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56 lines
2.4 KiB
C++
56 lines
2.4 KiB
C++
// Copyright 2026 Mocktail Project Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef MOCKTAIL_COMPAT_BIONIC_PTHREAD_CREATE_RUNTIME_H_
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#define MOCKTAIL_COMPAT_BIONIC_PTHREAD_CREATE_RUNTIME_H_
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#include <pthread.h>
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#include <cstddef>
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namespace mocktail::compat {
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using NativeThreadInitializer = void (*)();
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// Pinned Bionic LP64 pthread_internal.h keeps total per-thread reservation
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// near 1 MiB by subtracting its 32 KiB alternate signal stack from the normal
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// thread stack. Host defaults are not ABI substitutes: musl's default is only
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// 128 KiB on the supported Void runtime.
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inline constexpr size_t kBionicLp64DefaultThreadStackSize =
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(1U * 1024U * 1024U) - (32U * 1024U);
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static_assert(kBionicLp64DefaultThreadStackSize == 1015808U);
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// Used only after a Bionic-sized stack is rejected by the host at thread
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// creation time. The retry takes the largest of this floor, the requested
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// guest size, and the host default. That retains enough stack on musl without
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// shrinking glibc's default.
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inline constexpr size_t kBionicLp64FallbackThreadStackSize = 2U * 1024U * 1024U;
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// Installs the payload-owned per-thread initializer used by subsequently
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// created guest threads. Passing nullptr restores ordinary host behavior.
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void ConfigureBionicPthreadThreadInitializer(
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NativeThreadInitializer initializer) noexcept;
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} // namespace mocktail::compat
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// Creates a host thread after rebuilding the supported POSIX attributes.
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// Rebuilding avoids passing ABI-private pthread_attr_t state from the Android
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// payload directly into glibc.
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extern "C" int mocktail_bionic_pthread_create(pthread_t* thread,
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const pthread_attr_t* attr,
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void* (*start_routine)(void*),
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void* argument);
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#endif // MOCKTAIL_COMPAT_BIONIC_PTHREAD_CREATE_RUNTIME_H_
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