From e190d38057892b69246391841b234a368bc2b4ad Mon Sep 17 00:00:00 2001
From: deva <deva>
Date: Tue, 1 Mar 2011 19:19:02 +0000
Subject: MAJOR rewrite of the internals. New input/output 'plugin' system.
 Still a lot missing.

---
 src/mutex.cc | 125 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 src/mutex.cc

(limited to 'src/mutex.cc')

diff --git a/src/mutex.cc b/src/mutex.cc
new file mode 100644
index 0000000..ec0d0e8
--- /dev/null
+++ b/src/mutex.cc
@@ -0,0 +1,125 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set et sw=2 ts=2: */
+/***************************************************************************
+ *            mutex.cc
+ *
+ *  Thu Nov 12 10:51:32 CET 2009
+ *  Copyright 2009 Bent Bisballe Nyeng
+ *  deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ *  This file is part of Pracro.
+ *
+ *  Pracro 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
+ *  (at your option) any later version.
+ *
+ *  Pracro 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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Pracro; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#include "mutex.h"
+
+Mutex::Mutex()
+{
+  pthread_mutex_init (&mutex, NULL);
+}
+
+Mutex::~Mutex()
+{
+  pthread_mutex_destroy(&mutex);
+}
+
+bool Mutex::trylock()
+{
+  return pthread_mutex_trylock(&mutex) == 0;
+}
+
+void Mutex::lock()
+{
+  pthread_mutex_lock(&mutex);
+}
+
+void Mutex::unlock()
+{
+  pthread_mutex_unlock(&mutex);
+}
+
+
+MutexAutolock::MutexAutolock(Mutex &m)
+  : mutex(m)
+{
+  mutex.lock();
+}
+
+MutexAutolock::~MutexAutolock()
+{
+  mutex.unlock();
+}
+
+#ifdef TEST_MUTEX
+//deps:
+//cflags: $(PTHREAD_CFLAGS)
+//libs: $(PTHREAD_LIBS)
+#include <test.h>
+
+#include <unistd.h>
+
+volatile int cnt = 0;
+
+static void* thread_run(void *data)
+{
+  Mutex *mutex = (Mutex*)data;
+  mutex->lock();
+  cnt++;
+  mutex->unlock();
+  return NULL;
+}
+
+TEST_BEGIN;
+
+Mutex mutex;
+
+mutex.lock();
+TEST_FALSE(mutex.trylock(), "Testing if trylock works negative.");
+mutex.unlock();
+TEST_TRUE(mutex.trylock(), "Testing if trylock works positive.");
+mutex.unlock();
+
+mutex.lock();
+
+pthread_attr_t attr;
+pthread_t tid;
+pthread_attr_init(&attr);
+pthread_create(&tid, &attr, thread_run, &mutex);
+
+sleep(1);
+TEST_EQUAL_INT(cnt, 0, "Testing if lock prevent cnt from increasing.");
+mutex.unlock();
+
+sleep(1);
+TEST_EQUAL_INT(cnt, 1, "Testing if unlock makes cnt increase.");
+
+pthread_join(tid, NULL);
+pthread_attr_destroy(&attr);
+
+{
+  TEST_TRUE(mutex.trylock(), "Testing if autolock has not yet locked the mutex.");
+  mutex.unlock();
+  MutexAutolock mlock(mutex);
+  TEST_FALSE(mutex.trylock(), "Testing if autolock worked.");
+}
+
+TEST_TRUE(mutex.trylock(), "Testing if autolock has released the lock on the mutex.");
+mutex.unlock();
+
+TEST_END;
+
+#endif/*TEST_MUTEX*/
-- 
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