X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Fcore%2Fsemaphore.cpp;h=06e8435c3a34212599a8ead8817d28073c4c26cc;hp=bba39642c8c6aee8c52da11e931555a13645d485;hb=7f847aeb48e0e8f58ead52ba255cff27527628eb;hpb=cd89068b8ebafdc0f888c1aa21498bb93b55d814

diff --git a/source/core/semaphore.cpp b/source/core/semaphore.cpp
index bba3964..06e8435 100644
--- a/source/core/semaphore.cpp
+++ b/source/core/semaphore.cpp
@@ -1,120 +1,97 @@
-/* $Id$
-
-This file is part of libmspcore
-Copyright © 2006  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-#ifndef WIN32
+#ifdef WIN32
+#include <windows.h>
+#else
 #include <sys/time.h>
+#include <cerrno>
 #endif
-#include <errno.h>
+#include <msp/time/rawtime_private.h>
+#include <msp/time/timestamp.h>
+#include <msp/time/units.h>
+#include <msp/time/utils.h>
+#include "mutex_private.h"
 #include "semaphore.h"
-#include "../time/timestamp.h"
-#include "../time/units.h"
-#include "../time/utils.h"
+#include "systemerror.h"
 
 namespace Msp {
 
-Semaphore::Semaphore():
-	mutex(new Mutex),
-	own_mutex(true)
+struct Semaphore::Private
 {
-	init();
-}
-
-Semaphore::Semaphore(Mutex &m):
-	mutex(&m),
-	own_mutex(false)
-{
-	init();
-}
-
 #ifdef WIN32
-int Semaphore::signal()
-{
-	if(count==0) 
-		return 0;
-
-	int ret=!ReleaseSemaphore(sem, 1, 0); 
-
-	unsigned old_count=count;
-	mutex->unlock();
-	while(count==old_count)
-		Sleep(0);
-	mutex->lock();
+	HANDLE handle;
+#else
+	Mutex mutex;
+	pthread_cond_t cond;
+	unsigned limit;
+	unsigned count;
+#endif
+};
 
-	return ret;
-}
 
-int Semaphore::broadcast()
+Semaphore::Semaphore(unsigned limit):
+	priv(new Private)
 {
-	if(count==0)
-		return 0;
-	int ret=!ReleaseSemaphore(sem, count, 0);
-
-	mutex->unlock();
-	while(count)
-		Sleep(0);
-	mutex->lock();
-
-	return ret;
+#ifdef WIN32
+	priv->handle = CreateSemaphore(0, 0, limit, 0);
+#else
+	pthread_cond_init(&priv->cond, 0);
+	priv->limit = limit;
+	priv->count = 0;
+#endif
 }
 
-int Semaphore::wait()
-{ 
-	++count; 
-	mutex->unlock();
-	DWORD ret=WaitForSingleObject(sem, INFINITE); 
-	mutex->lock();
-	--count;
-	
-	return ret==WAIT_OBJECT_0;
-}
+Semaphore::~Semaphore()
+{
+#ifdef WIN32
+	CloseHandle(priv->handle);
+#else
+	pthread_cond_destroy(&priv->cond);
 #endif
+	delete priv;
+}
 
-int Semaphore::wait(const Time::TimeDelta &d)
+void Semaphore::signal()
 {
-#ifndef WIN32
-	Time::TimeStamp ts=Time::now()+d;
-
-	timespec timeout;
-	timeout.tv_sec=ts.raw()/1000000;
-	timeout.tv_nsec=(ts.raw()%1000000)*1000;
-
-	int r=pthread_cond_timedwait(&sem, &mutex->mutex, &timeout);
-	if(r==ETIMEDOUT)
-		return 1;
-	else if(r)
-		return -1;
-	return 0;
+#ifdef WIN32
+	if(!ReleaseSemaphore(priv->handle, 1, 0))
+		throw system_error("ReleaseSemaphore");
 #else
-	++count;
-	mutex->lock();
-	DWORD ret=WaitForSingleObject(sem, (DWORD)(d/Time::usec));
-	mutex->unlock();
-	--count;
-	return ret==WAIT_OBJECT_0;
+	MutexLock mlock(priv->mutex);
+	if(priv->count<priv->limit)
+		++priv->count;
+	if(int err = pthread_cond_signal(&priv->cond))
+		throw system_error("pthread_cond_signal", err);
 #endif
 }
 
-Semaphore::~Semaphore()
-{
-	if(own_mutex)
-		delete mutex;
+void Semaphore::wait()
+{ 
 #ifdef WIN32
-	CloseHandle(sem);
+	DWORD ret = WaitForSingleObject(priv->handle, INFINITE);
+	if(ret==WAIT_FAILED)
+		throw system_error("WaitForSingleObject");
 #else
-	pthread_cond_destroy(&sem);
+	MutexLock mlock(priv->mutex);
+	while(!priv->count)
+		if(int err = pthread_cond_wait(&priv->cond, &priv->mutex.priv->mutex))
+			throw system_error("pthread_cond_wait", err);
+	--priv->count;
 #endif
 }
 
-void Semaphore::init()
+bool Semaphore::wait(const Time::TimeDelta &d)
 {
 #ifdef WIN32
-	count=0;
-	sem=CreateSemaphore(0, 0, 32, 0);
+	DWORD ret = WaitForSingleObject(priv->handle, (DWORD)(d/Time::usec));
+	if(ret==WAIT_FAILED)
+		throw system_error("WaitForSingleObject");
+	return ret==WAIT_OBJECT_0;
 #else
-	pthread_cond_init(&sem, 0);
+	timespec timeout = Time::rawtime_to_timespec((Time::now()+d).raw());
+
+	int err = pthread_cond_timedwait(&priv->cond, &priv->mutex.priv->mutex, &timeout);
+	if(err && err!=ETIMEDOUT)
+		throw system_error("pthread_cond_timedwait", err);
+	return err==0;
 #endif
 }