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1 // Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
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2 // Licensed under the MIT License:
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3 //
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4 // Permission is hereby granted, free of charge, to any person obtaining a copy
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5 // of this software and associated documentation files (the "Software"), to deal
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6 // in the Software without restriction, including without limitation the rights
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7 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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8 // copies of the Software, and to permit persons to whom the Software is
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9 // furnished to do so, subject to the following conditions:
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10 //
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11 // The above copyright notice and this permission notice shall be included in
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12 // all copies or substantial portions of the Software.
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13 //
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14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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20 // THE SOFTWARE.
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21
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22 #pragma once
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23
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24 #include "common.h"
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25 #include "function.h"
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26 #include "exception.h"
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27
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28 KJ_BEGIN_HEADER
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29
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30 namespace kj {
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31
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32 class Thread {
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33 // A thread! Pass a lambda to the constructor, and it runs in the thread. The destructor joins
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34 // the thread. If the function throws an exception, it is rethrown from the thread's destructor
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35 // (if not unwinding from another exception).
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36
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37 public:
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38 explicit Thread(Function<void()> func);
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39 KJ_DISALLOW_COPY_AND_MOVE(Thread);
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40
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41 ~Thread() noexcept(false);
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42
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43 #if !_WIN32
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44 void sendSignal(int signo);
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45 // Send a Unix signal to the given thread, using pthread_kill or an equivalent.
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46 #endif
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47
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48 void detach();
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49 // Don't join the thread in ~Thread().
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50
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51 private:
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52 struct ThreadState {
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53 ThreadState(Function<void()> func);
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54
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55 Function<void()> func;
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56 Function<void(Function<void()>)> initializer;
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57 kj::Maybe<kj::Exception> exception;
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58
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59 unsigned int refcount;
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60 // Owned by the parent thread and the child thread.
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61
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62 void unref();
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63 };
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64 ThreadState* state;
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65
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66 #if _WIN32
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67 void* threadHandle;
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68 #else
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69 unsigned long long threadId; // actually pthread_t
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70 #endif
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71 bool detached = false;
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72
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73 #if _WIN32
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74 static unsigned long __stdcall runThread(void* ptr);
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75 #else
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76 static void* runThread(void* ptr);
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77 #endif
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78 };
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79
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80 } // namespace kj
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81
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82 KJ_END_HEADER
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