Mutex reingeniring

include/Mutex.h

@@ -34,10 +34,6 @@
 // -----------------------------------------------------------------------------------------
 namespace UniSetTypes
 {
-	typedef sig_atomic_t mutex_atomic_t;
-	// typedef _Atomic_word mutex_atomic_t;
-	
-
 	/*! \class uniset_mutex 
 
 	 * \note   \a lock()  \a unlock()   . 
@@ -48,10 +44,14 @@ namespace UniSetTypes
 	{
 		public:
 		    uniset_mutex();
-			uniset_mutex( std::string name );
+			uniset_mutex( const std::string name );
     		~uniset_mutex();
 
-			bool isRelease();
+			inline bool isRelease() const
+			{
+				return (bool)release;
+			};			
+
 			void lock();
 		    void unlock();
 			
@@ -66,18 +66,13 @@ namespace UniSetTypes
 			friend class uniset_mutex_lock;
 		   	uniset_mutex (const uniset_mutex& r);
 	   		const uniset_mutex &operator=(const uniset_mutex& r);
-			omni_condition* cnd;
-			std::string nm;
-			omni_semaphore sem;
-			omni_mutex mtx;
-			mutex_atomic_t locked;
+			volatile sig_atomic_t release;
+			const std::string nm;
+			omni_condition* ocond;
+			omni_mutex     omutex; 
  	};
 
 	/*! \class uniset_mutex_lock
-	 * \author Pavel Vainerman
-	 * \date   $Date: 2007/11/18 19:13:35 $
-	 * \version $Id: Mutex.h,v 1.14 2007/11/18 19:13:35 vpashka Exp $
-	 *
 	 *	    .   . \ref MutexHowToPage
 	 *	\note    ,  lock   ... 
 	 *	\warning        !
@@ -93,13 +88,13 @@ namespace UniSetTypes
 
 		private:
 		   	uniset_mutex* mutex;
-			mutex_atomic_t mlock;
 		    uniset_mutex_lock(const uniset_mutex_lock&);
 		    uniset_mutex_lock& operator=(const uniset_mutex_lock&);
 	};
 
 	// -------------------------------------------------------------------------
-	class uniset_spin_mutex
+	class uniset_spin_mutex:
+		public uniset_mutex
 	{
 		public:
 			uniset_spin_mutex();
@@ -111,7 +106,6 @@ namespace UniSetTypes
 			void unlock();
 
 		private:
-			mutex_atomic_t m;
 	};
 	// -------------------------------------------------------------------------
 	class uniset_spin_lock

src/Various/Mutex.cc

@@ -33,180 +33,100 @@
 using namespace std;
 using namespace UniSetTypes;
 // -----------------------------------------------------------------------------
-static mutex_atomic_t mutex_atomic_read( mutex_atomic_t* m ){ return (*m); }
-static mutex_atomic_t mutex_atomic_set( mutex_atomic_t* m, int val ){ return (*m) = val; }
-//static void mutex_atomic_inc( mutex_atomic_t* m ){ (*m)++; }
-//static void mutex_atomic_dec( mutex_atomic_t* m ){ (*m)--; }
-// -----------------------------------------------------------------------------
-#ifndef HAVE_LINUX_LIBC_HEADERS_INCLUDE_LINUX_FUTEX_H
-uniset_mutex::uniset_mutex():
-	cnd(0),
+#define MUTEX_LOCK_SLEEP_MS 20
+// -------------------------------------------------------------------------------------------
+uniset_mutex::uniset_mutex(): 
+	release(1),
 	nm("")
 {
-	mutex_atomic_set(&locked,0);
-	cnd = new omni_condition(&mtx);
+	ocond = new omni_condition(&omutex);
 }
 
-uniset_mutex::uniset_mutex( string name ):
+uniset_mutex::uniset_mutex( const string name ):
+	release(1),
 	nm(name)
 {
-	mutex_atomic_set(&locked,0);
-	cnd = new omni_condition(&mtx);
+	ocond = new omni_condition(&omutex);
 }
 
 uniset_mutex::~uniset_mutex()
 {
-	unlock();
-	mutex_atomic_set(&locked,0);
-	delete cnd;
+	delete ocond;
 }
 
 void uniset_mutex::lock()
 {
-	sem.wait();
-	mutex_atomic_set(&locked,1);
+	release = 0;
+	omutex.lock();
 }
 
 void uniset_mutex::unlock()
 {
-	mutex_atomic_set(&locked,0);
-	sem.post();
-	cnd->signal();
-}
-
-bool uniset_mutex::isRelease()
-{
-	return (bool)!mutex_atomic_read(&locked);
-}
-// -----------------------------------------------------------------------------
-#else // HAVE_LINUX_FUTEX_H
-// -----------------------------------------------------------------------------
-// mutex   futex
-//      http://kerneldump.110mb.com/dokuwiki/doku.php?id=wiki:futexes_are_tricky_p3
-//  : http://people.redhat.com/drepper/futex.pdf
-
-uniset_mutex::uniset_mutex():
-	val(0),nm("")
-{
-}
-
-uniset_mutex::uiset_mutex( std::string name )
-	val(0),
-	nm(name)
-{
-
-}
-
-uniset_mutex::~uniset_mutex()
-{
-	unlock();	
+	omutex.unlock();
+	release = 1;
 }
 
-void uniset_mutex::lock() 
-{
-	int c;
-	if( (c = cmpxchg(val, 0, 1))!= 0 )
-	{
-		do 
-		{
-			if( c==2 || cmpxchg(val, 1, 2)!=0 )
-				futex_wait(&val, 2);
-		}
-		while( (c = cmpxchg(val, 0, 2))!=0 );
-	}
-}
-
-void uniset_mutex::unlock()
-{
-	if( atomic_dec(val)!=1 )
-	{
-		val = 0;
-		futex_wake(&val, 1);
-	}
-}
-
-bool uniset_mutex::isRelease()
-{
-	return (bool)cmpxchg(val, 1, 2);
-}
-
-// -----------------------------------------------------------------------------
-#endif // HAVE_LINUX_FUTEX_H
-// -----------------------------------------------------------------------------
-
 const uniset_mutex &uniset_mutex::operator=(const uniset_mutex& r)
 {
 	if( this != &r )
-		locked = r.locked;
-
+	{
+		release = r.release;
+		if( release )
+			unlock();
+		else
+			lock();
+	}
 	return *this;
 }
 
-uniset_mutex::uniset_mutex( const uniset_mutex& r ):
-	cnd(0),
+uniset_mutex::uniset_mutex (const uniset_mutex& r):
+	release(r.release),
 	nm(r.nm)
 {
-	cnd = new omni_condition(&mtx);
 }
 
-// -----------------------------------------------------------------------------
-uniset_mutex_lock::uniset_mutex_lock( uniset_mutex& m, int timeMS ):
+// -------------------------------------------------------------------------------------------
+uniset_mutex_lock::uniset_mutex_lock( uniset_mutex& m, int t_msec ):
 	mutex(&m)
 {
-	if( timeMS <= 0 || mutex->isRelease() )
+	if( m.isRelease() )
 	{
-		mutex->lock();
-		mutex_atomic_set(&mlock,1);
+		m.lock();
+//		cerr << "....locked.." << endl; 
 		return;
 	}
-
-	unsigned long sec, msec;
-	omni_thread::get_time(&sec,&msec, timeMS/1000, (timeMS%1000)*1000000 );
-	mutex->mtx.lock();
-	if( !mutex->cnd->timedwait(sec, msec) )
+	
+	if( t_msec > 0 )
 	{
-		if( !mutex->name().empty() && unideb.debugging( Debug::type(Debug::LEVEL9|Debug::WARN)) )
+		m.lock();
+		unsigned long sec, msec;
+		omni_thread::get_time(&sec,&msec,t_msec/1000,(t_msec%1000)*1000000);
+//		cerr << "....wait mutex msec=" << t_msec << endl; 
+//		m.ocond->timedwait(sec, msec);
+		if( !m.ocond->timedwait(sec, msec) )
 		{
-			unideb[Debug::type(Debug::LEVEL9|Debug::WARN)] 
-				<< "(mutex_lock):     " 
-				<< timeMS << " msec  " << mutex->name() << endl;
+			m.unlock();
+			return;
 		}
-
-		mutex_atomic_set(&mlock,0);
-		mutex->mtx.unlock();
-		return;	//	  
 	}
-
-	mutex_atomic_set(&mlock,1);
-	mutex->lock();
-	mutex->mtx.unlock();
-}
-
-// -----------------------------------------------------------------------------
-bool uniset_mutex_lock::lock_ok()
-{ 
-	return (bool)mutex_atomic_read(&mlock);
+//	m.lock();
 }
 
+// -------------------------------------------------------------------------------------------
 uniset_mutex_lock::~uniset_mutex_lock()
 {	
-	if( mutex_atomic_read(&mlock) )
-	{
-		mutex_atomic_set(&mlock,0);
-		mutex->unlock();
-	}
+	mutex->unlock();
+	mutex->ocond->signal();
 }
-// -----------------------------------------------------------------------------
+// -------------------------------------------------------------------------------------------
 uniset_mutex_lock& uniset_mutex_lock::operator=(const uniset_mutex_lock &r)
 {
 	return *this;
 }
-// -----------------------------------------------------------------------------
-#ifndef HAVE_LINUX_LIBC_HEADERS_INCLUDE_LINUX_FUTEX_H
-
+// -------------------------------------------------------------------------------------------
 uniset_spin_mutex::uniset_spin_mutex()
 {
-	unlock();	
+	unlock();
 }
 
 uniset_spin_mutex::~uniset_spin_mutex()
@@ -229,54 +149,14 @@ uniset_spin_mutex::uniset_spin_mutex( const uniset_spin_mutex& r )
 
 void uniset_spin_mutex::lock( int check_pause_msec )
 {
-	while( mutex_atomic_read(&m) != 0 )
-	{
-		if( check_pause_msec > 0 )
-			msleep(check_pause_msec);
-	}
-	mutex_atomic_set(&m,1);
+	lock();
 }
 
 void uniset_spin_mutex::unlock()
 {
-	m = 0;
-}
-
-#else // HAVE_FUTEX
-
-// mutex   futex
-//      http://kerneldump.110mb.com/dokuwiki/doku.php?id=wiki:futexes_are_tricky_p3
-//  : http://people.redhat.com/drepper/futex.pdf
-void uniset_spin_mutex::lock( int check_pause_msec )
-{
-	struct timespec tm;
-	tm.tv_sec 	= check_pause_msec / 1000;
-	tm.tv_nsec 	= check_pause_msec%1000;
-
-	int c;
-	if( (c = cmpxchg(val, 0, 1))!= 0 )
-	{
-		do 
-		{
-			if( c==2 || cmpxchg(val, 1, 2)!=0 )
-			{
-				if( futex_wait(&val, 2,tm) == ETIMEDOUT )
-					return;
-			}
-		}
-		while( (c = cmpxchg(val, 0, 2))!=0 );
-	}
+	unlock();
 }
 
-void uniset_spin_mutex::unlock()
-{
-	if( atomic_dec(val)!=1 )
-	{
-		val = 0;
-		futex_wake(&val, 1);
-	}
-}
-#endif // HAVE_FUTEX
 
 // -------------------------------------------------------------------------------------------
 uniset_spin_lock::uniset_spin_lock( uniset_spin_mutex& _m, int check_pause_msec ):

tests/Makefile.am

@@ -2,7 +2,7 @@
 # This file is part of the UniSet library                                  #
 ############################################################################
 
-noinst_PROGRAMS 		= passivetimer unixml ui
+noinst_PROGRAMS 		= passivetimer unixml ui umutex
 
 passivetimer_SOURCES 	= passivetimer.cc
 passivetimer_LDADD 		= $(top_builddir)/lib/libUniSet.la
@@ -16,6 +16,10 @@ ui_SOURCES 	= ui.cc
 ui_LDADD 	= $(top_builddir)/lib/libUniSet.la
 ui_CPPFLAGS	= -I$(top_builddir)/include
 
+umutex_SOURCES 	= umutex.cc
+umutex_LDADD 	= $(top_builddir)/lib/libUniSet.la
+umutex_CPPFLAGS	= -I$(top_builddir)/include
+
 
 include $(top_builddir)/conf/setting.mk
 

tests/umutex.cc

+#include <string>
+#include "Mutex.h"
+#include "ThreadCreator.h"
+#include "UniSetTypes.h"
+
+using namespace std;
+using namespace UniSetTypes;
+
+uniset_mutex m;
+
+class MyClass
+{
+	public:
+		MyClass( const std::string name ): nm(name)
+		{
+			thr = new ThreadCreator<MyClass>(this, &MyClass::thread);
+		}
+		
+		~MyClass()
+		{
+			delete thr;
+		}
+				
+		void execute()
+		{
+			thr->start();
+		}
+			
+	protected:
+		std::string nm;
+
+		void thread()
+		{
+			while(1)
+			{
+				{
+					cerr << nm << ": before release=" << m.isRelease() << endl;
+					uniset_mutex_lock l(m,5000);
+					cerr << nm << ": after release=" << m.isRelease() << endl;
+				}
+				msleep(300);
+			}
+		}
+				
+		private:
+			ThreadCreator<MyClass>* thr;
+	};
+		
+
+int main( int argc, const char **argv )
+{
+	MyClass* mc1 = new MyClass("t1");
+	MyClass* mc2 = new MyClass("t2");
+	
+//	m.lock();
+	mc1->execute();
+	msleep(200);
+	mc2->execute();
+	pause();
+//	m.unlock();
+	return 0;
+}