/* * Carla Thread * Copyright (C) 2013-2019 Filipe Coelho * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * For a full copy of the GNU General Public License see the doc/GPL.txt file. */ #ifndef CARLA_THREAD_HPP_INCLUDED #define CARLA_THREAD_HPP_INCLUDED #include "CarlaMutex.hpp" #include "CarlaString.hpp" #include "CarlaProcessUtils.hpp" #ifdef CARLA_OS_LINUX # include #endif // ----------------------------------------------------------------------- // CarlaThread class class CarlaThread { protected: /* * Constructor. */ CarlaThread(const char* const threadName = nullptr) noexcept : fLock(), fSignal(), fName(threadName), #ifdef PTW32_DLLPORT fHandle({nullptr, 0}), #else fHandle(0), #endif fShouldExit(false) {} /* * Destructor. */ virtual ~CarlaThread() /*noexcept*/ { CARLA_SAFE_ASSERT(! isThreadRunning()); stopThread(-1); } /* * Virtual function to be implemented by the subclass. */ virtual void run() = 0; // ------------------------------------------------------------------- public: /* * Check if the thread is running. */ bool isThreadRunning() const noexcept { #ifdef PTW32_DLLPORT return (fHandle.p != nullptr); #else return (fHandle != 0); #endif } /* * Check if the thread should exit. */ bool shouldThreadExit() const noexcept { return fShouldExit; } /* * Start the thread. */ bool startThread(const bool withRealtimePriority = false) noexcept { // check if already running CARLA_SAFE_ASSERT_RETURN(! isThreadRunning(), true); pthread_t handle; pthread_attr_t attr; pthread_attr_init(&attr); struct sched_param sched_param; carla_zeroStruct(sched_param); if (withRealtimePriority) { sched_param.sched_priority = 80; #ifndef CARLA_OS_HAIKU if (pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) == 0 && pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED) == 0 && # ifndef CARLA_OS_WIN (pthread_attr_setschedpolicy(&attr, SCHED_FIFO) == 0 || pthread_attr_setschedpolicy(&attr, SCHED_RR) == 0) && # endif pthread_attr_setschedparam(&attr, &sched_param) == 0) { carla_stdout("CarlaThread setup with realtime priority successful"); } else #endif { carla_stdout("CarlaThread setup with realtime priority failed, going with normal priority instead"); pthread_attr_destroy(&attr); pthread_attr_init(&attr); } } const CarlaMutexLocker cml(fLock); fShouldExit = false; bool ok = pthread_create(&handle, &attr, _entryPoint, this) == 0; pthread_attr_destroy(&attr); if (withRealtimePriority && !ok) { carla_stdout("CarlaThread with realtime priority failed on creation, going with normal priority instead"); pthread_attr_init(&attr); ok = pthread_create(&handle, &attr, _entryPoint, this) == 0; pthread_attr_destroy(&attr); } CARLA_SAFE_ASSERT_RETURN(ok, false); #ifdef PTW32_DLLPORT CARLA_SAFE_ASSERT_RETURN(handle.p != nullptr, false); #else CARLA_SAFE_ASSERT_RETURN(handle != 0, false); #endif pthread_detach(handle); _copyFrom(handle); // wait for thread to start fSignal.wait(); return true; } /* * Stop the thread. * In the 'timeOutMilliseconds': * = 0 -> no wait * > 0 -> wait timeout value * < 0 -> wait forever */ bool stopThread(const int timeOutMilliseconds) noexcept { const CarlaMutexLocker cml(fLock); if (isThreadRunning()) { signalThreadShouldExit(); if (timeOutMilliseconds != 0) { // Wait for the thread to stop int timeOutCheck = (timeOutMilliseconds == 1 || timeOutMilliseconds == -1) ? timeOutMilliseconds : timeOutMilliseconds/2; for (; isThreadRunning();) { carla_msleep(2); if (timeOutCheck < 0) continue; if (timeOutCheck > 0) timeOutCheck -= 1; else break; } } if (isThreadRunning()) { // should never happen! carla_stderr2("Carla assertion failure: \"! isThreadRunning()\" in file %s, line %i", __FILE__, __LINE__); // copy thread id so we can clear our one pthread_t threadId; _copyTo(threadId); _init(); try { pthread_cancel(threadId); } CARLA_SAFE_EXCEPTION("pthread_cancel"); return false; } } return true; } /* * Tell the thread to stop as soon as possible. */ void signalThreadShouldExit() noexcept { fShouldExit = true; } // ------------------------------------------------------------------- /* * Returns the name of the thread. * This is the name that gets set in the constructor. */ const CarlaString& getThreadName() const noexcept { return fName; } /* * Returns the Id/handle of the thread. */ pthread_t getThreadId() const noexcept { return fHandle; } /* * Changes the name of the caller thread. */ static void setCurrentThreadName(const char* const name) noexcept { CARLA_SAFE_ASSERT_RETURN(name != nullptr && name[0] != '\0',); carla_setProcessName(name); #if defined(__GLIBC__) && (__GLIBC__ * 1000 + __GLIBC_MINOR__) >= 2012 && !defined(CARLA_OS_GNU_HURD) pthread_setname_np(pthread_self(), name); #endif } // ------------------------------------------------------------------- private: CarlaMutex fLock; // Thread lock CarlaSignal fSignal; // Thread start wait signal const CarlaString fName; // Thread name volatile pthread_t fHandle; // Handle for this thread volatile bool fShouldExit; // true if thread should exit /* * Init pthread type. */ void _init() noexcept { #ifdef PTW32_DLLPORT fHandle.p = nullptr; fHandle.x = 0; #else fHandle = 0; #endif } /* * Copy our pthread type from another var. */ void _copyFrom(const pthread_t& handle) noexcept { #ifdef PTW32_DLLPORT fHandle.p = handle.p; fHandle.x = handle.x; #else fHandle = handle; #endif } /* * Copy our pthread type to another var. */ void _copyTo(volatile pthread_t& handle) const noexcept { #ifdef PTW32_DLLPORT handle.p = fHandle.p; handle.x = fHandle.x; #else handle = fHandle; #endif } /* * Thread entry point. */ void _runEntryPoint() noexcept { setCurrentThreadName(fName); // report ready fSignal.signal(); try { run(); } catch(...) {} // done _init(); } /* * Thread entry point. */ static void* _entryPoint(void* userData) noexcept { static_cast(userData)->_runEntryPoint(); return nullptr; } CARLA_DECLARE_NON_COPY_CLASS(CarlaThread) }; // ----------------------------------------------------------------------- #endif // CARLA_THREAD_HPP_INCLUDED