1 files changed, 398 insertions, 0 deletions
diff --git a/mcop_mt/threads_posix.cpp b/mcop_mt/threads_posix.cpp
new file mode 100644
index 0000000..6fa953c
--- /dev/null
+++ b/mcop_mt/threads_posix.cpp
@@ -0,0 +1,398 @@
+    /*
+
+    Copyright (C) 2001 Stefan Westerfeld
+                       stefan@space.twc.de
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+  
+    This library 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
+    Library General Public License for more details.
+   
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+
+    */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+/* only compile this if we have libpthread available */
+#ifdef HAVE_LIBPTHREAD
+
+#include <gsl/gslconfig.h>
+#include <gsl/gslcommon.h>
+
+#include <sys/types.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <debug.h>
+#include <string.h>
+#include "thread.h"
+
+/*
+ * define this if you want to protect mutexes against being locked twice by
+ * the same thread
+ */
+#undef PTHREAD_DEBUG
+
+namespace Arts {
+
+extern void *gslGlobalMutexTable;
+
+namespace PosixThreads {
+
+class ThreadCondition_impl;
+
+class Mutex_impl : public Arts::Mutex_impl {
+protected:
+	friend class ThreadCondition_impl;
+	pthread_mutex_t mutex;
+
+#ifdef PTHREAD_DEBUG
+	pthread_t owner;
+#endif
+
+public:
+	Mutex_impl()
+	{
+		pthread_mutex_init(&mutex, 0);
+#ifdef PTHREAD_DEBUG
+		owner = 0;
+#endif
+	}
+	void lock()
+	{
+#ifdef PTHREAD_DEBUG
+		pthread_t self = pthread_self();
+		arts_assert(owner != self);
+#endif
+
+		pthread_mutex_lock(&mutex);
+
+#ifdef PTHREAD_DEBUG
+		arts_assert(!owner);
+		owner = self;
+#endif
+	}
+	bool tryLock()
+	{
+#ifdef PTHREAD_DEBUG
+		pthread_t self = pthread_self();
+		arts_assert(owner != self);
+#endif
+
+		int result = pthread_mutex_trylock(&mutex);
+
+#ifdef PTHREAD_DEBUG
+		if(result == 0)
+		{
+			arts_assert(!owner);
+			owner = self;
+		}
+#endif
+		return(result == 0);
+	}
+	void unlock()
+	{
+#ifdef PTHREAD_DEBUG
+		arts_assert(owner == pthread_self());
+		owner = 0;
+#endif
+
+		pthread_mutex_unlock(&mutex);
+	}
+};
+
+class RecMutex_impl : public Arts::Mutex_impl {
+protected:
+	friend class ThreadCondition_impl;
+	pthread_mutex_t mutex;
+	pthread_t owner;
+	int count;
+
+public:
+	RecMutex_impl()
+	{
+		pthread_mutex_init(&mutex, 0);
+		owner = 0;
+		count = 0;
+	}
+	void lock()
+	{
+		pthread_t self = pthread_self();
+		if(owner != self)
+		{
+			pthread_mutex_lock(&mutex);
+#ifdef PTHREAD_DEBUG
+			arts_assert(count == 0);
+			arts_assert(!owner);
+#endif
+			owner = self;
+		}
+		count++;
+	}
+	bool tryLock()
+	{
+		pthread_t self = pthread_self();
+		if(owner != self)
+		{
+			int result = pthread_mutex_trylock(&mutex);
+			if(result != 0)
+				return false;
+
+#ifdef PTHREAD_DEBUG
+			arts_assert(count == 0);
+			arts_assert(!owner);
+#endif
+			owner = self;
+		}
+		count++;
+		return true;
+	}
+	void unlock()
+	{
+#ifdef PTHREAD_DEBUG
+		arts_assert(owner == pthread_self());
+		arts_assert(count > 0);
+#endif
+
+		count--;
+		if(count == 0)
+		{
+			owner = 0;
+			pthread_mutex_unlock(&mutex);
+		}
+	}
+};
+
+
+class Thread_impl : public Arts::Thread_impl {
+protected:
+	friend class PosixThreads;
+	pthread_t pthread;
+	Thread *thread;
+
+public:
+	Thread_impl(Thread *thread) : thread(thread) {
+	}
+	void setPriority(int priority) {
+		struct sched_param sp;
+		sp.sched_priority = priority;
+		if (pthread_setschedparam(pthread, SCHED_FIFO, &sp))
+			arts_debug("Thread::setPriority: sched_setscheduler failed");
+	}
+	static pthread_key_t privateDataKey;
+	static void *threadStartInternal(void *impl)
+	{
+		pthread_setspecific(privateDataKey, impl);
+
+    	((Thread_impl *)impl)->thread->run();
+    	return 0;
+	}
+	void start() {
+		pthread_create(&pthread,0,threadStartInternal,this);
+	}
+	void waitDone() {
+    	void *foo;
+    	pthread_join(pthread,&foo);
+	}
+};
+
+pthread_key_t Thread_impl::privateDataKey;
+
+class ThreadCondition_impl : public Arts::ThreadCondition_impl {
+protected:
+	pthread_cond_t cond;
+
+public:
+	ThreadCondition_impl() {
+		pthread_cond_init(&cond, 0);
+	}
+	~ThreadCondition_impl() {
+		pthread_cond_destroy(&cond);
+	}
+	void wakeOne() {
+		pthread_cond_signal(&cond);
+	}
+	void wakeAll() {
+		pthread_cond_broadcast(&cond);
+	}
+	void wait(Arts::Mutex_impl *mutex) {
+#ifdef PTHREAD_DEBUG
+		pthread_t self = pthread_self();
+		arts_assert(((Mutex_impl *)mutex)->owner == self);
+		((Mutex_impl *)mutex)->owner = 0;
+#endif
+
+		pthread_cond_wait(&cond, &((Mutex_impl*)mutex)->mutex);
+
+#ifdef PTHREAD_DEBUG
+		arts_assert(((Mutex_impl *)mutex)->owner == 0);
+		((Mutex_impl *)mutex)->owner = self;
+#endif
+	}
+};
+
+class Semaphore_impl : public Arts::Semaphore_impl
+{
+private:
+	sem_t semaphore;
+
+public:
+	Semaphore_impl(int shared, int count) {
+		sem_init(&semaphore, shared, count);
+	}
+
+	~Semaphore_impl() {
+		sem_destroy(&semaphore);
+	}
+
+	void wait() {
+		sem_wait(&semaphore);
+	}
+
+	int tryWait() {
+		return sem_trywait(&semaphore);
+	}
+
+	void post() {
+		sem_post(&semaphore);
+	}
+
+	int getValue() {
+		int retval;
+		sem_getvalue(&semaphore, &retval);
+		return retval;
+	}
+};
+
+class PosixThreads : public SystemThreads {
+private:
+	pthread_t mainThread;
+public:
+	PosixThreads() {
+		mainThread = pthread_self();
+	}
+	bool isMainThread() {
+		return pthread_equal(pthread_self(), mainThread);
+	}
+	Arts::Mutex_impl *createMutex_impl() {
+		return new Mutex_impl();
+	}
+	Arts::Mutex_impl *createRecMutex_impl() {
+		return new RecMutex_impl();
+	}
+	Arts::Thread_impl *createThread_impl(Arts::Thread *thread) {
+		return new Thread_impl(thread);
+	}
+	Arts::ThreadCondition_impl *createThreadCondition_impl() {
+		return new ThreadCondition_impl();
+	}
+	Thread *getCurrentThread() {
+		void *data = pthread_getspecific(Thread_impl::privateDataKey);
+
+		if(data)
+			return ((Thread_impl *)data)->thread;
+		else
+			return 0; /* main thread */
+	}
+	Arts::Semaphore_impl *createSemaphore_impl(int shared, int count) {
+		return new Semaphore_impl(shared, count);
+	}
+};
+
+// set posix threads on startup
+static class SetSystemThreads {
+private:
+	PosixThreads posixThreads;
+
+public:
+	SetSystemThreads() {
+		if(pthread_key_create(&Thread_impl::privateDataKey, 0))
+			arts_debug("SystemThreads init: pthread_key_create failed");
+
+		SystemThreads::init(&posixThreads);
+
+	}
+	~SetSystemThreads() {
+		SystemThreads::init(0);
+
+		if(pthread_key_delete(Thread_impl::privateDataKey))
+			arts_debug("SystemThreads init: pthread_key_delete failed");
+	}
+} initOnStartup;
+
+/* -fast- locking for gsl on platforms with unix98 support */
+#if (GSL_HAVE_MUTEXATTR_SETTYPE > 0)
+static void pth_mutex_init (GslMutex *mutex)
+{
+	/* need NULL attribute here, which is the fast mutex on glibc
+	 * and cannot be chosen through the pthread_mutexattr_settype()
+	 */
+	pthread_mutex_init ((pthread_mutex_t*) mutex, NULL);
+}
+static void pth_rec_mutex_init (GslRecMutex *mutex)
+{
+	pthread_mutexattr_t attr;
+
+	pthread_mutexattr_init (&attr);
+	pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
+	pthread_mutex_init ((pthread_mutex_t*) mutex, &attr);
+	pthread_mutexattr_destroy (&attr);
+}
+static void pth_rec_cond_init (GslCond *cond)
+{
+	pthread_cond_init ((pthread_cond_t*) cond, NULL);
+}
+static void pth_rec_cond_wait_timed (GslCond *cond, GslMutex *mutex,
+									 gulong abs_secs, gulong abs_usecs)
+{
+	struct ::timespec abstime;
+
+	abstime.tv_sec = abs_secs;
+	abstime.tv_nsec = abs_usecs * 1000;
+	pthread_cond_timedwait ((pthread_cond_t*) cond, (pthread_mutex_t*) mutex, &abstime);
+}
+static GslMutexTable pth_mutex_table = {
+	pth_mutex_init,
+	(void (*) (GslMutex*)) pthread_mutex_lock,
+	(int  (*) (GslMutex*)) pthread_mutex_trylock,
+	(void (*) (GslMutex*)) pthread_mutex_unlock,
+	(void (*) (GslMutex*)) pthread_mutex_destroy,
+	pth_rec_mutex_init,
+	(void (*) (GslRecMutex*)) pthread_mutex_lock,
+	(int  (*) (GslRecMutex*)) pthread_mutex_trylock,
+	(void (*) (GslRecMutex*)) pthread_mutex_unlock,
+	(void (*) (GslRecMutex*)) pthread_mutex_destroy,
+	pth_rec_cond_init,
+	(void (*)            (GslCond*)) pthread_cond_signal,
+	(void (*)            (GslCond*)) pthread_cond_broadcast,
+	(void (*) (GslCond*, GslMutex*)) pthread_cond_wait,
+	pth_rec_cond_wait_timed,
+	(void (*)            (GslCond*)) pthread_cond_destroy,
+};
+
+static class SetGslMutexTable {
+public:
+	SetGslMutexTable()
+	{
+		gslGlobalMutexTable = &pth_mutex_table;
+	}
+} initGslMutexTable;
+#endif
+
+}
+
+}
+
+#endif