// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/runtime/runtime-utils.h"
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#include "src/arguments-inl.h"
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#include "src/base/platform/time.h"
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#include "src/conversions-inl.h"
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#include "src/futex-emulation.h"
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#include "src/globals.h"
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#include "src/objects/js-array-buffer-inl.h"
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// Implement Futex API for SharedArrayBuffers as defined in the
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// SharedArrayBuffer draft spec, found here:
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// https://github.com/tc39/ecmascript_sharedmem
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namespace v8 {
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namespace internal {
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RUNTIME_FUNCTION(Runtime_AtomicsNumWaitersForTesting) {
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HandleScope scope(isolate);
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DCHECK_EQ(2, args.length());
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CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
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CONVERT_SIZE_ARG_CHECKED(index, 1);
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CHECK(sta->GetBuffer()->is_shared());
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CHECK_LT(index, NumberToSize(sta->length()));
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CHECK_EQ(sta->type(), kExternalInt32Array);
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Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
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size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
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return FutexEmulation::NumWaitersForTesting(array_buffer, addr);
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}
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RUNTIME_FUNCTION(Runtime_SetAllowAtomicsWait) {
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HandleScope scope(isolate);
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DCHECK_EQ(1, args.length());
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CONVERT_BOOLEAN_ARG_CHECKED(set, 0);
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isolate->set_allow_atomics_wait(set);
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return ReadOnlyRoots(isolate).undefined_value();
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}
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} // namespace internal
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} // namespace v8
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