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// ####ECOSHOSTGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of the eCos host tools.
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// Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 or (at your option) any
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// later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the
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// Free Software Foundation, Inc., 51 Franklin Street,
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// Fifth Floor, Boston, MA 02110-1301, USA.
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// -------------------------------------------
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// ####ECOSHOSTGPLCOPYRIGHTEND####
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//=================================================================
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//
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// eCosThreadUtils.h
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//
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//
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//=================================================================
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//=================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): sdf
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// Contributors: sdf
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// Date: 1999-04-01
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// Description: Threading-related utiltities
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// Usage:
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//
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//####DESCRIPTIONEND####
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#ifndef _ECOSTHREADUTILS_H
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#define _ECOSTHREADUTILS_H
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#include "eCosStd.h"
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#include "Collections.h"
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#ifndef _WIN32 // UNIX
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#ifndef NO_THREADS
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#include <pthread.h>
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#endif
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#endif
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//=================================================================
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// This class handles threads in a host-independent manner.
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// It also contains a few thread-related functions such as Sleep
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//=================================================================
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class CeCosThreadUtils {
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public:
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#ifdef _WIN32
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typedef DWORD THREAD_ID;
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#else // UNIX
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#ifndef NO_THREADS
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typedef int THREAD_ID;
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#else
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typedef pthread_t THREAD_ID;
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#endif
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#endif
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static THREAD_ID GetThreadId(); // Get my current thread ID, mostly for debugging
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// CS supports a single system-wide critical sections (recursive mutexes).
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// You are expected to use macros ENTERCRITICAL and LEAVECRITICAL to use this class - these macros define
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// a block containing a CS object, which has the effect of creating a critical section.
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// Exit from the block (by whatever means, including an exception) causes the CS dtor
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// to be called so as to release the section.
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class CS{
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public:
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static bool InCriticalSection(); // This thread owns the critical section
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CS();
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virtual ~CS();
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protected:
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static int m_nCriticalSectionLock; // The number of times the recursive mutex has been locked. Management of this allows us to avoid use of true recursive mutexes on UNIX.
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static THREAD_ID nCSOwner; // The thread owning the resource.
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#ifdef _WIN32
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static CRITICAL_SECTION cs; // The one and only critical section
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static bool bCSInitialized;
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#else // UNIX
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#ifndef NO_THREADS
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static pthread_mutex_t cs; // The one and only critical section
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#endif
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#endif
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};
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#define ENTERCRITICAL {CeCosThreadUtils::CS c
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#define LEAVECRITICAL }
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static int AtomicIncrement (int &n); // return old value
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static int AtomicDecrement (int &n); // return old value
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// Wait for this boolean to become true, subject to the given timeout
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// If the timeout happens first, the return code will be false - otherwise true
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static bool WaitFor (bool &b, int dTimeout=0x7fffffff);
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///////////////////////////////////////////////////////////////////////////
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// Define the characteristics of a callback procedure:
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// A callback procedure, used both for thread entry points and thread completion callbacks
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typedef void (CALLBACK CallbackProc)(void *);
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// Run a thread: pThreadFunc is the entry point (passed pParam). No notification of completion.
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static bool RunThread(CallbackProc *pThreadFunc, void *pParam, LPCTSTR pszName=_T("")) { return RunThread(pThreadFunc,pParam,0,0,pszName); }
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// Run a thread, setting the bool on completion
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static bool RunThread(CallbackProc *pThreadFunc, void *pParam, bool *pb, LPCTSTR pszName=_T("")) { *pb=false; return RunThread(pThreadFunc,pParam,0,pb,pszName); }
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// Run a thread, calling the callback on completion
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static bool RunThread(CallbackProc *pThreadFunc, void *pParam, CallbackProc *pCompletionFunc, LPCTSTR pszName=_T("")) { return RunThread(pThreadFunc,pParam,pCompletionFunc,pParam,pszName); }
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static void Sleep (int nMsec);
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protected:
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// Run a thread: arbitrary callbcak
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static bool RunThread(CallbackProc *pThreadFunc, void *pParam, CallbackProc *pCompletionFunc, void *pCompletionParam, LPCTSTR pszName);
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// This is the information that is passed to the host-specific thread proc. It is simply enough to call the thread entry point and
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// call the callback (or set the boolean) at the end.
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struct ThreadInfo {
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CallbackProc *pThreadFunc; // The thread proc is this function
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void *pThreadParam; // - called with this parameter
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CallbackProc *pCompletionFunc; // At the end - call this function
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void *pCompletionParam; // with this parameter
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String strName; // For debugging
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ThreadInfo (CallbackProc *_pThreadFunc,void *_pThreadParam,CallbackProc *_pCompletionFunc,void *_pCompletionParam,LPCTSTR pszName) :
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pThreadFunc(_pThreadFunc),
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pThreadParam(_pThreadParam),
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pCompletionFunc(_pCompletionFunc),
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pCompletionParam(_pCompletionParam),
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strName(pszName){}
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};
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// THREADFUNC is the result type of the thread function
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#ifdef _WIN32
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typedef unsigned long THREADFUNC;
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static int CALLBACK FilterFunction(LPEXCEPTION_POINTERS p);
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#else // UNIX
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typedef void * THREADFUNC;
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#endif
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static THREADFUNC CALLBACK SThreadFunc (void *pParam);
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};
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#endif
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