1 // Copyright 2013 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/libplatform/default-platform.h"
6
7 #include <algorithm>
8 #include <queue>
9
10 #include "src/base/logging.h"
11 #include "src/base/platform/platform.h"
12 #include "src/base/sys-info.h"
13 #include "src/libplatform/worker-thread.h"
14
15 namespace v8 {
16 namespace platform {
17
18
CreateDefaultPlatform(int thread_pool_size)19 v8::Platform* CreateDefaultPlatform(int thread_pool_size) {
20 DefaultPlatform* platform = new DefaultPlatform();
21 platform->SetThreadPoolSize(thread_pool_size);
22 platform->EnsureInitialized();
23 return platform;
24 }
25
26
PumpMessageLoop(v8::Platform * platform,v8::Isolate * isolate)27 bool PumpMessageLoop(v8::Platform* platform, v8::Isolate* isolate) {
28 return reinterpret_cast<DefaultPlatform*>(platform)->PumpMessageLoop(isolate);
29 }
30
31
32 const int DefaultPlatform::kMaxThreadPoolSize = 4;
33
34
DefaultPlatform()35 DefaultPlatform::DefaultPlatform()
36 : initialized_(false), thread_pool_size_(0) {}
37
38
~DefaultPlatform()39 DefaultPlatform::~DefaultPlatform() {
40 base::LockGuard<base::Mutex> guard(&lock_);
41 queue_.Terminate();
42 if (initialized_) {
43 for (std::vector<WorkerThread*>::iterator i = thread_pool_.begin();
44 i != thread_pool_.end(); ++i) {
45 delete *i;
46 }
47 }
48 for (std::map<v8::Isolate*, std::queue<Task*> >::iterator i =
49 main_thread_queue_.begin();
50 i != main_thread_queue_.end(); ++i) {
51 while (!i->second.empty()) {
52 delete i->second.front();
53 i->second.pop();
54 }
55 }
56 }
57
58
SetThreadPoolSize(int thread_pool_size)59 void DefaultPlatform::SetThreadPoolSize(int thread_pool_size) {
60 base::LockGuard<base::Mutex> guard(&lock_);
61 DCHECK(thread_pool_size >= 0);
62 if (thread_pool_size < 1) {
63 thread_pool_size = base::SysInfo::NumberOfProcessors();
64 }
65 thread_pool_size_ =
66 std::max(std::min(thread_pool_size, kMaxThreadPoolSize), 1);
67 }
68
69
EnsureInitialized()70 void DefaultPlatform::EnsureInitialized() {
71 base::LockGuard<base::Mutex> guard(&lock_);
72 if (initialized_) return;
73 initialized_ = true;
74
75 for (int i = 0; i < thread_pool_size_; ++i)
76 thread_pool_.push_back(new WorkerThread(&queue_));
77 }
78
79
PumpMessageLoop(v8::Isolate * isolate)80 bool DefaultPlatform::PumpMessageLoop(v8::Isolate* isolate) {
81 Task* task = NULL;
82 {
83 base::LockGuard<base::Mutex> guard(&lock_);
84 std::map<v8::Isolate*, std::queue<Task*> >::iterator it =
85 main_thread_queue_.find(isolate);
86 if (it == main_thread_queue_.end() || it->second.empty()) {
87 return false;
88 }
89 task = it->second.front();
90 it->second.pop();
91 }
92 task->Run();
93 delete task;
94 return true;
95 }
96
CallOnBackgroundThread(Task * task,ExpectedRuntime expected_runtime)97 void DefaultPlatform::CallOnBackgroundThread(Task *task,
98 ExpectedRuntime expected_runtime) {
99 EnsureInitialized();
100 queue_.Append(task);
101 }
102
103
CallOnForegroundThread(v8::Isolate * isolate,Task * task)104 void DefaultPlatform::CallOnForegroundThread(v8::Isolate* isolate, Task* task) {
105 base::LockGuard<base::Mutex> guard(&lock_);
106 main_thread_queue_[isolate].push(task);
107 }
108
109 } } // namespace v8::platform
110