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Side by Side Diff: dart/runtime/bin/eventhandler_linux.h

Issue 879353003: Introduce optional 'bool shared' parameter to ServerSocket.bind() ... (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge
Patch Set: Addressed comments Created 5 years, 10 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #ifndef BIN_EVENTHANDLER_LINUX_H_ 5 #ifndef BIN_EVENTHANDLER_LINUX_H_
6 #define BIN_EVENTHANDLER_LINUX_H_ 6 #define BIN_EVENTHANDLER_LINUX_H_
7 7
8 #if !defined(BIN_EVENTHANDLER_H_) 8 #if !defined(BIN_EVENTHANDLER_H_)
9 #error Do not include eventhandler_linux.h directly; use eventhandler.h instead. 9 #error Do not include eventhandler_linux.h directly; use eventhandler.h instead.
10 #endif 10 #endif
11 11
12 #include <errno.h> 12 #include <errno.h>
13 #include <sys/epoll.h> 13 #include <sys/epoll.h>
14 #include <sys/socket.h> 14 #include <sys/socket.h>
15 #include <unistd.h> 15 #include <unistd.h>
16 16
17 #include "platform/hashmap.h" 17 #include "platform/hashmap.h"
18 #include "platform/signal_blocker.h" 18 #include "platform/signal_blocker.h"
19 19
20 20
21 namespace dart { 21 namespace dart {
22 namespace bin { 22 namespace bin {
23 23
24 class InterruptMessage { 24 class DescriptorInfo : public DescriptorInfoBase {
25 public: 25 public:
26 intptr_t id; 26 explicit DescriptorInfo(intptr_t fd) : DescriptorInfoBase(fd) { }
27 Dart_Port dart_port;
28 int64_t data;
29 };
30 27
31 template<typename T> 28 virtual ~DescriptorInfo() { }
32 class CircularLinkedList {
33 public:
34 CircularLinkedList() : head_(NULL) {}
35 29
36 // Returns true if the list was empty. 30 intptr_t GetPollEvents();
37 bool Add(T t) { 31
38 Entry* e = new Entry(t); 32 virtual void Close() {
39 if (head_ == NULL) { 33 VOID_TEMP_FAILURE_RETRY(close(fd_));
40 // Empty list, make e head, and point to itself. 34 fd_ = -1;
41 e->next_ = e;
42 e->prev_ = e;
43 head_ = e;
44 return true;
45 } else {
46 // Insert e as the last element in the list.
47 e->prev_ = head_->prev_;
48 e->next_ = head_;
49 e->prev_->next_ = e;
50 head_->prev_ = e;
51 return false;
52 }
53 } 35 }
54
55 void RemoveHead() {
56 Entry* e = head_;
57 if (e->next_ == e) {
58 head_ = NULL;
59 } else {
60 e->prev_->next_ = e->next_;
61 e->next_->prev_ = e->prev_;
62 head_ = e->next_;
63 }
64 delete e;
65 }
66
67 T head() const { return head_->t; }
68
69 bool HasHead() {
70 return head_ != NULL;
71 }
72
73 void Rotate() {
74 head_ = head_->next_;
75 }
76
77 private:
78 struct Entry {
79 explicit Entry(const T& t) : t(t) {}
80 const T t;
81 Entry* next_;
82 Entry* prev_;
83 };
84
85 Entry* head_;
86 }; 36 };
87 37
88 38
89 class ListeningSocketData; 39 class DescriptorInfoSingle
90 class SocketData { 40 : public DescriptorInfoSingleMixin<DescriptorInfo> {
91 public: 41 public:
92 explicit SocketData(intptr_t fd) 42 explicit DescriptorInfoSingle(intptr_t fd)
93 : fd_(fd), port_(0), mask_(0), tokens_(16) { 43 : DescriptorInfoSingleMixin(fd) {}
94 ASSERT(fd_ != -1); 44 virtual ~DescriptorInfoSingle() {}
95 }
96
97 virtual ~SocketData() {
98 }
99
100 intptr_t GetPollEvents();
101
102 void Close() {
103 port_ = 0;
104 mask_ = 0;
105 VOID_TEMP_FAILURE_RETRY(close(fd_));
106 fd_ = -1;
107 }
108
109 void SetMask(intptr_t mask) {
110 ASSERT(fd_ != -1);
111 mask_ = mask;
112 }
113
114 intptr_t fd() { return fd_; }
115 virtual Dart_Port port() { return port_; }
116
117 virtual bool IsListeningSocket() const { return false; }
118
119 virtual bool AddPort(Dart_Port port) {
120 ASSERT(port_ == 0);
121 port_ = port;
122 return true;
123 }
124
125 virtual bool RemovePort(Dart_Port port) {
126 ASSERT(port_ == 0 || port_ == port);
127 return true;
128 }
129
130 // Returns true if the last token was taken.
131 virtual bool TakeToken() {
132 ASSERT(tokens_ > 0);
133 tokens_--;
134 return tokens_ == 0;
135 }
136
137 // Returns true if the tokens was 0 before adding.
138 virtual bool ReturnToken(Dart_Port port, int count) {
139 ASSERT(port_ == port);
140 ASSERT(tokens_ >= 0);
141 bool was_empty = tokens_ == 0;
142 tokens_ += count;
143 return was_empty;
144 }
145
146 bool HasTokens() const { return tokens_ > 0; }
147
148 protected:
149 intptr_t fd_;
150 Dart_Port port_;
151 intptr_t mask_;
152 int tokens_;
153 }; 45 };
154 46
155 47
156 class ListeningSocketData : public SocketData { 48 class DescriptorInfoMultiple
157 private: 49 : public DescriptorInfoMultipleMixin<DescriptorInfo> {
158 static const int kTokenCount = 4;
159
160 static bool SamePortValue(void* key1, void* key2) {
161 return reinterpret_cast<Dart_Port>(key1) ==
162 reinterpret_cast<Dart_Port>(key2);
163 }
164
165 static uint32_t GetHashmapHashFromPort(Dart_Port port) {
166 return static_cast<uint32_t>(port & 0xFFFFFFFF);
167 }
168
169 static void* GetHashmapKeyFromPort(Dart_Port port) {
170 return reinterpret_cast<void*>(port);
171 }
172
173 public: 50 public:
174 explicit ListeningSocketData(intptr_t fd) 51 explicit DescriptorInfoMultiple(intptr_t fd)
175 : SocketData(fd), 52 : DescriptorInfoMultipleMixin(fd) {}
176 tokens_map_(&SamePortValue, 4) {} 53 virtual ~DescriptorInfoMultiple() {}
177
178 bool IsListeningSocket() const { return true; }
179
180 bool AddPort(Dart_Port port) {
181 HashMap::Entry* entry = tokens_map_.Lookup(
182 GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port), true);
183 entry->value = reinterpret_cast<void*>(kTokenCount);
184 return live_ports_.Add(port);
185 }
186
187 virtual bool RemovePort(Dart_Port port) {
188 HashMap::Entry* entry = tokens_map_.Lookup(
189 GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port), false);
190 if (entry != NULL) {
191 intptr_t tokens = reinterpret_cast<intptr_t>(entry->value);
192 if (tokens == 0) {
193 while (idle_ports_.head() != port) {
194 idle_ports_.Rotate();
195 }
196 idle_ports_.RemoveHead();
197 } else {
198 while (live_ports_.head() != port) {
199 live_ports_.Rotate();
200 }
201 live_ports_.RemoveHead();
202 }
203 tokens_map_.Remove(
204 GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port));
205 } else {
206 // NOTE: This is a listening socket which has been immediately closed.
207 //
208 // If a listening socket is not listened on, the event handler does not
209 // know about it beforehand. So the first time the event handler knows
210 // about it, is when it is supposed to be closed. We therefore do nothing
211 // here.
212 //
213 // But whether to close it, depends on whether other isolates have it open
214 // as well or not.
215 }
216 return !live_ports_.HasHead();
217 }
218
219 bool TakeToken() {
220 ASSERT(live_ports_.HasHead());
221 Dart_Port port = live_ports_.head();
222 HashMap::Entry* entry = tokens_map_.Lookup(
223 GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port), false);
224 ASSERT(entry != NULL);
225 intptr_t tokens = reinterpret_cast<intptr_t>(entry->value);
226 tokens--;
227 entry->value = reinterpret_cast<void*>(tokens);
228 if (tokens == 0) {
229 live_ports_.RemoveHead();
230 idle_ports_.Add(port);
231 if (!live_ports_.HasHead()) {
232 return true;
233 }
234 } else {
235 live_ports_.Rotate();
236 }
237 return false;
238 }
239
240 Dart_Port port() { return live_ports_.head(); }
241
242 bool ReturnToken(Dart_Port port, int count) {
243 HashMap::Entry* entry = tokens_map_.Lookup(
244 GetHashmapKeyFromPort(port), GetHashmapHashFromPort(port), false);
245 ASSERT(entry != NULL);
246 intptr_t tokens = reinterpret_cast<intptr_t>(entry->value);
247 tokens += count;
248 entry->value = reinterpret_cast<void*>(tokens);
249 if (tokens == count) {
250 // Return to live_ports_.
251 while (idle_ports_.head() != port) {
252 idle_ports_.Rotate();
253 }
254 idle_ports_.RemoveHead();
255 bool was_empty = !live_ports_.HasHead();
256 live_ports_.Add(port);
257 return was_empty;
258 }
259 return false;
260 }
261
262 private:
263 CircularLinkedList<Dart_Port> live_ports_;
264 CircularLinkedList<Dart_Port> idle_ports_;
265 HashMap tokens_map_;
266 }; 54 };
267 55
268 56
269 class EventHandlerImplementation { 57 class EventHandlerImplementation {
270 public: 58 public:
271 EventHandlerImplementation(); 59 EventHandlerImplementation();
272 ~EventHandlerImplementation(); 60 ~EventHandlerImplementation();
273 61
274 // Gets the socket data structure for a given file 62 // Gets the socket data structure for a given file
275 // descriptor. Creates a new one if one is not found. 63 // descriptor. Creates a new one if one is not found.
276 SocketData* GetSocketData(intptr_t fd, bool is_listening); 64 DescriptorInfo* GetDescriptorInfo(intptr_t fd, bool is_listening);
277 void SendData(intptr_t id, Dart_Port dart_port, int64_t data); 65 void SendData(intptr_t id, Dart_Port dart_port, int64_t data);
278 void Start(EventHandler* handler); 66 void Start(EventHandler* handler);
279 void Shutdown(); 67 void Shutdown();
280 68
281 private: 69 private:
282 void HandleEvents(struct epoll_event* events, int size); 70 void HandleEvents(struct epoll_event* events, int size);
283 static void Poll(uword args); 71 static void Poll(uword args);
284 void WakeupHandler(intptr_t id, Dart_Port dart_port, int64_t data); 72 void WakeupHandler(intptr_t id, Dart_Port dart_port, int64_t data);
285 void HandleInterruptFd(); 73 void HandleInterruptFd();
286 void SetPort(intptr_t fd, Dart_Port dart_port, intptr_t mask); 74 void SetPort(intptr_t fd, Dart_Port dart_port, intptr_t mask);
287 intptr_t GetPollEvents(intptr_t events, SocketData* sd); 75 intptr_t GetPollEvents(intptr_t events, DescriptorInfo* sd);
288 static void* GetHashmapKeyFromFd(intptr_t fd); 76 static void* GetHashmapKeyFromFd(intptr_t fd);
289 static uint32_t GetHashmapHashFromFd(intptr_t fd); 77 static uint32_t GetHashmapHashFromFd(intptr_t fd);
290 78
291 HashMap socket_map_; 79 HashMap socket_map_;
292 TimeoutQueue timeout_queue_; 80 TimeoutQueue timeout_queue_;
293 bool shutdown_; 81 bool shutdown_;
294 int interrupt_fds_[2]; 82 int interrupt_fds_[2];
295 int epoll_fd_; 83 int epoll_fd_;
296 int timer_fd_; 84 int timer_fd_;
297 }; 85 };
298 86
299 } // namespace bin 87 } // namespace bin
300 } // namespace dart 88 } // namespace dart
301 89
302 #endif // BIN_EVENTHANDLER_LINUX_H_ 90 #endif // BIN_EVENTHANDLER_LINUX_H_
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