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// Copyright (c) 1996 James Clark
// See the file copying.txt for copying permission.
#ifndef Mutex_INCLUDED
#define Mutex_INCLUDED 1
#ifdef SP_MUTEX_WIN32
#define SP_MUTEX
#define STRICT 1
#include <windows.h>
// <windows.h> appears to turn these warnings back on
#ifdef _MSC_VER
#pragma warning ( disable : 4237 )
#endif
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
class Mutex {
public:
class Lock {
public:
Lock(Mutex *mp) : mp_(mp) {
if (mp) ::EnterCriticalSection(&mp->cs_);
}
~Lock() {
if (mp_) ::LeaveCriticalSection(&mp_->cs_);
}
private:
Mutex *mp_;
};
Mutex() {
::InitializeCriticalSection(&cs_);
}
~Mutex() {
::DeleteCriticalSection(&cs_);
}
friend class Lock;
private:
CRITICAL_SECTION cs_;
};
#ifdef SP_NAMESPACE
}
#endif
#endif /* SP_MUTEX_WIN32 */
#ifdef SP_MUTEX_MACH
#define SP_MUTEX
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
#ifdef SP_NAMESPACE
}
#endif
#endif /* SP_MUTEX_MACH */
#ifdef SP_MUTEX_PTHREADS
// Support for pthreads on Linux.
// Written by Matthias Clasen <clasen@mathematik.uni-freiburg.de>
#define SP_MUTEX
extern "C" {
#include <pthread.h>
}
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
class Mutex {
public:
class Lock {
// Lock serves to automatically unlock Mutex, however control leaves
// a block. Don't let any "warning: unused variable `class Mutex::Lock lock'"
// mislead you; hopefully your compiler won't optimise this away...
public:
Lock(Mutex *mp) : mp_(mp) { if (mp_) pthread_mutex_lock (&mp_->cs_); }
~Lock() { if (mp_) pthread_mutex_unlock(&mp_->cs_); }
private:
Mutex *mp_;
};
Mutex() { pthread_mutex_init (&cs_, NULL); }
~Mutex() { pthread_mutex_destroy (&cs_); }
friend class Lock;
private:
pthread_mutex_t cs_;
};
#ifdef SP_NAMESPACE
}
#endif
#endif /* SP_MUTEX_PTHREADS */
#ifndef SP_MUTEX
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
class Mutex {
public:
class Lock {
public:
Lock(Mutex *) { }
};
Mutex() { }
};
#ifdef SP_NAMESPACE
}
#endif
#endif /* not SP_MUTEX */
#endif /* not Mutex_INCLUDED */
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