cannam@135: // Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
cannam@135: // Licensed under the MIT License:
cannam@135: //
cannam@135: // Permission is hereby granted, free of charge, to any person obtaining a copy
cannam@135: // of this software and associated documentation files (the "Software"), to deal
cannam@135: // in the Software without restriction, including without limitation the rights
cannam@135: // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
cannam@135: // copies of the Software, and to permit persons to whom the Software is
cannam@135: // furnished to do so, subject to the following conditions:
cannam@135: //
cannam@135: // The above copyright notice and this permission notice shall be included in
cannam@135: // all copies or substantial portions of the Software.
cannam@135: //
cannam@135: // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
cannam@135: // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
cannam@135: // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
cannam@135: // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
cannam@135: // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
cannam@135: // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
cannam@135: // THE SOFTWARE.
cannam@135: 
cannam@135: #ifndef KJ_THREAD_H_
cannam@135: #define KJ_THREAD_H_
cannam@135: 
cannam@135: #if defined(__GNUC__) && !KJ_HEADER_WARNINGS
cannam@135: #pragma GCC system_header
cannam@135: #endif
cannam@135: 
cannam@135: #include "common.h"
cannam@135: #include "function.h"
cannam@135: #include "exception.h"
cannam@135: 
cannam@135: namespace kj {
cannam@135: 
cannam@135: class Thread {
cannam@135:   // A thread!  Pass a lambda to the constructor, and it runs in the thread.  The destructor joins
cannam@135:   // the thread.  If the function throws an exception, it is rethrown from the thread's destructor
cannam@135:   // (if not unwinding from another exception).
cannam@135: 
cannam@135: public:
cannam@135:   explicit Thread(Function<void()> func);
cannam@135:   KJ_DISALLOW_COPY(Thread);
cannam@135: 
cannam@135:   ~Thread() noexcept(false);
cannam@135: 
cannam@135: #if !_WIN32
cannam@135:   void sendSignal(int signo);
cannam@135:   // Send a Unix signal to the given thread, using pthread_kill or an equivalent.
cannam@135: #endif
cannam@135: 
cannam@135:   void detach();
cannam@135:   // Don't join the thread in ~Thread().
cannam@135:   //
cannam@135:   // TODO(soon): Currently broken: the thread uses the Thread objects during its execution; instead
cannam@135:   //   the Thread object and the thread itself will need to share a refcounted object.
cannam@135: 
cannam@135: private:
cannam@135:   struct ThreadState {
cannam@135:     Function<void()> func;
cannam@135:     kj::Maybe<kj::Exception> exception;
cannam@135: 
cannam@135:     unsigned int refcount;
cannam@135:     // Owned by the parent thread and the child thread.
cannam@135: 
cannam@135:     void unref();
cannam@135:   };
cannam@135:   ThreadState* state;
cannam@135: 
cannam@135: #if _WIN32
cannam@135:   void* threadHandle;
cannam@135: #else
cannam@135:   unsigned long long threadId;  // actually pthread_t
cannam@135: #endif
cannam@135:   bool detached = false;
cannam@135: 
cannam@135: #if _WIN32
cannam@135:   static unsigned long __stdcall runThread(void* ptr);
cannam@135: #else
cannam@135:   static void* runThread(void* ptr);
cannam@135: #endif
cannam@135: };
cannam@135: 
cannam@135: }  // namespace kj
cannam@135: 
cannam@135: #endif  // KJ_THREAD_H_