| // 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 |