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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/runtime/runtime-utils.h"
#include "src/arguments.h"
#include "src/base/platform/time.h"
#include "src/conversions-inl.h"
#include "src/futex-emulation.h"
#include "src/globals.h"
// Implement Futex API for SharedArrayBuffers as defined in the
// SharedArrayBuffer draft spec, found here:
// https://github.com/tc39/ecmascript_sharedmem
namespace v8 {
namespace internal {
RUNTIME_FUNCTION(Runtime_AtomicsWait) {
HandleScope scope(isolate);
DCHECK(args.length() == 4);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
CONVERT_SIZE_ARG_CHECKED(index, 1);
CONVERT_INT32_ARG_CHECKED(value, 2);
CONVERT_DOUBLE_ARG_CHECKED(timeout, 3);
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index, NumberToSize(sta->length()));
CHECK_EQ(sta->type(), kExternalInt32Array);
CHECK(timeout == V8_INFINITY || !std::isnan(timeout));
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
return FutexEmulation::Wait(isolate, array_buffer, addr, value, timeout);
}
RUNTIME_FUNCTION(Runtime_AtomicsWake) {
HandleScope scope(isolate);
DCHECK(args.length() == 3);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
CONVERT_SIZE_ARG_CHECKED(index, 1);
CONVERT_INT32_ARG_CHECKED(count, 2);
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index, NumberToSize(sta->length()));
CHECK_EQ(sta->type(), kExternalInt32Array);
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
return FutexEmulation::Wake(isolate, array_buffer, addr, count);
}
RUNTIME_FUNCTION(Runtime_AtomicsNumWaitersForTesting) {
HandleScope scope(isolate);
DCHECK(args.length() == 2);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0);
CONVERT_SIZE_ARG_CHECKED(index, 1);
CHECK(sta->GetBuffer()->is_shared());
CHECK_LT(index, NumberToSize(sta->length()));
CHECK_EQ(sta->type(), kExternalInt32Array);
Handle<JSArrayBuffer> array_buffer = sta->GetBuffer();
size_t addr = (index << 2) + NumberToSize(sta->byte_offset());
return FutexEmulation::NumWaitersForTesting(isolate, array_buffer, addr);
}
} // namespace internal
} // namespace v8
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