1 // Copyright 2015 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "src/runtime/runtime-utils.h" 6 7 #include "src/arguments.h" 8 #include "src/base/platform/time.h" 9 #include "src/conversions-inl.h" 10 #include "src/futex-emulation.h" 11 #include "src/globals.h" 12 13 // Implement Futex API for SharedArrayBuffers as defined in the 14 // SharedArrayBuffer draft spec, found here: 15 // https://github.com/lars-t-hansen/ecmascript_sharedmem 16 17 namespace v8 { 18 namespace internal { 19 20 RUNTIME_FUNCTION(Runtime_AtomicsFutexWait) { 21 HandleScope scope(isolate); 22 DCHECK(args.length() == 4); 23 CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0); 24 CONVERT_SIZE_ARG_CHECKED(index, 1); 25 CONVERT_INT32_ARG_CHECKED(value, 2); 26 CONVERT_DOUBLE_ARG_CHECKED(timeout, 3); 27 CHECK(sta->GetBuffer()->is_shared()); 28 CHECK_LT(index, NumberToSize(isolate, sta->length())); 29 CHECK_EQ(sta->type(), kExternalInt32Array); 30 CHECK(timeout == V8_INFINITY || !std::isnan(timeout)); 31 32 Handle<JSArrayBuffer> array_buffer = sta->GetBuffer(); 33 size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset()); 34 35 return FutexEmulation::Wait(isolate, array_buffer, addr, value, timeout); 36 } 37 38 39 RUNTIME_FUNCTION(Runtime_AtomicsFutexWake) { 40 HandleScope scope(isolate); 41 DCHECK(args.length() == 3); 42 CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0); 43 CONVERT_SIZE_ARG_CHECKED(index, 1); 44 CONVERT_INT32_ARG_CHECKED(count, 2); 45 CHECK(sta->GetBuffer()->is_shared()); 46 CHECK_LT(index, NumberToSize(isolate, sta->length())); 47 CHECK_EQ(sta->type(), kExternalInt32Array); 48 49 Handle<JSArrayBuffer> array_buffer = sta->GetBuffer(); 50 size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset()); 51 52 return FutexEmulation::Wake(isolate, array_buffer, addr, count); 53 } 54 55 56 RUNTIME_FUNCTION(Runtime_AtomicsFutexWakeOrRequeue) { 57 HandleScope scope(isolate); 58 DCHECK(args.length() == 5); 59 CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0); 60 CONVERT_SIZE_ARG_CHECKED(index1, 1); 61 CONVERT_INT32_ARG_CHECKED(count, 2); 62 CONVERT_INT32_ARG_CHECKED(value, 3); 63 CONVERT_SIZE_ARG_CHECKED(index2, 4); 64 CHECK(sta->GetBuffer()->is_shared()); 65 CHECK_LT(index1, NumberToSize(isolate, sta->length())); 66 CHECK_LT(index2, NumberToSize(isolate, sta->length())); 67 CHECK_EQ(sta->type(), kExternalInt32Array); 68 69 Handle<JSArrayBuffer> array_buffer = sta->GetBuffer(); 70 size_t addr1 = (index1 << 2) + NumberToSize(isolate, sta->byte_offset()); 71 size_t addr2 = (index2 << 2) + NumberToSize(isolate, sta->byte_offset()); 72 73 return FutexEmulation::WakeOrRequeue(isolate, array_buffer, addr1, count, 74 value, addr2); 75 } 76 77 78 RUNTIME_FUNCTION(Runtime_AtomicsFutexNumWaitersForTesting) { 79 HandleScope scope(isolate); 80 DCHECK(args.length() == 2); 81 CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, sta, 0); 82 CONVERT_SIZE_ARG_CHECKED(index, 1); 83 CHECK(sta->GetBuffer()->is_shared()); 84 CHECK_LT(index, NumberToSize(isolate, sta->length())); 85 CHECK_EQ(sta->type(), kExternalInt32Array); 86 87 Handle<JSArrayBuffer> array_buffer = sta->GetBuffer(); 88 size_t addr = (index << 2) + NumberToSize(isolate, sta->byte_offset()); 89 90 return FutexEmulation::NumWaitersForTesting(isolate, array_buffer, addr); 91 } 92 } // namespace internal 93 } // namespace v8 94
