sl@0: // Copyright (C) 2000 Stephen Cleary
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org for updates, documentation, and revision history.
sl@0: 
sl@0: #ifndef BOOST_POOL_MUTEX_HPP
sl@0: #define BOOST_POOL_MUTEX_HPP
sl@0: 
sl@0: #include <boost/config.hpp>  // for workarounds
sl@0: 
sl@0: // Extremely Light-Weight wrapper classes for OS thread synchronization
sl@0: 
sl@0: // Configuration: for now, we just choose between pthread or Win32 mutexes or none
sl@0: 
sl@0: #define BOOST_MUTEX_HELPER_NONE         0
sl@0: #define BOOST_MUTEX_HELPER_WIN32        1
sl@0: #define BOOST_MUTEX_HELPER_PTHREAD      2
sl@0: 
sl@0: #if !defined(BOOST_HAS_THREADS) && !defined(BOOST_NO_MT)
sl@0: # define BOOST_NO_MT
sl@0: #endif
sl@0: 
sl@0: #ifdef BOOST_NO_MT
sl@0:   // No multithreading -> make locks into no-ops
sl@0:   #define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_NONE
sl@0: #else
sl@0:   #ifdef BOOST_WINDOWS
sl@0:     #define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_WIN32
sl@0:   #else
sl@0:     #include <unistd.h>
sl@0:     #ifdef _POSIX_THREADS
sl@0:       #define BOOST_MUTEX_HELPER BOOST_MUTEX_HELPER_PTHREAD
sl@0:     #endif
sl@0:   #endif
sl@0: #endif
sl@0: 
sl@0: #ifndef BOOST_MUTEX_HELPER
sl@0:   #error Unable to determine platform mutex type; define BOOST_NO_MT to assume single-threaded
sl@0: #endif
sl@0: 
sl@0: #ifndef BOOST_NO_MT
sl@0: # ifdef BOOST_WINDOWS
sl@0: #  include <windows.h>
sl@0: # endif
sl@0: # ifdef _POSIX_THREADS
sl@0: #  include <pthread.h>
sl@0: # endif
sl@0: #endif
sl@0: 
sl@0: namespace boost {
sl@0: 
sl@0: namespace details {
sl@0: namespace pool {
sl@0: 
sl@0: #ifndef BOOST_NO_MT
sl@0: 
sl@0: #ifdef BOOST_WINDOWS
sl@0: 
sl@0: class win32_mutex
sl@0: {
sl@0:   private:
sl@0:     CRITICAL_SECTION mtx;
sl@0: 
sl@0:     win32_mutex(const win32_mutex &);
sl@0:     void operator=(const win32_mutex &);
sl@0: 
sl@0:   public:
sl@0:     win32_mutex()
sl@0:     { InitializeCriticalSection(&mtx); }
sl@0: 
sl@0:     ~win32_mutex()
sl@0:     { DeleteCriticalSection(&mtx); }
sl@0: 
sl@0:     void lock()
sl@0:     { EnterCriticalSection(&mtx); }
sl@0: 
sl@0:     void unlock()
sl@0:     { LeaveCriticalSection(&mtx); }
sl@0: };
sl@0: 
sl@0: #endif // defined(BOOST_WINDOWS)
sl@0: 
sl@0: #ifdef _POSIX_THREADS
sl@0: 
sl@0: class pthread_mutex
sl@0: {
sl@0:   private:
sl@0:     pthread_mutex_t mtx;
sl@0: 
sl@0:     pthread_mutex(const pthread_mutex &);
sl@0:     void operator=(const pthread_mutex &);
sl@0: 
sl@0:   public:
sl@0:     pthread_mutex()
sl@0:     { pthread_mutex_init(&mtx, 0); }
sl@0: 
sl@0:     ~pthread_mutex()
sl@0:     { pthread_mutex_destroy(&mtx); }
sl@0: 
sl@0:     void lock()
sl@0:     { pthread_mutex_lock(&mtx); }
sl@0: 
sl@0:     void unlock()
sl@0:     { pthread_mutex_unlock(&mtx); }
sl@0: };
sl@0: 
sl@0: #endif // defined(_POSIX_THREADS)
sl@0: 
sl@0: #endif // !defined(BOOST_NO_MT)
sl@0: 
sl@0: class null_mutex
sl@0: {
sl@0:   private:
sl@0:     null_mutex(const null_mutex &);
sl@0:     void operator=(const null_mutex &);
sl@0: 
sl@0:   public:
sl@0:     null_mutex() { }
sl@0: 
sl@0:     static void lock() { }
sl@0:     static void unlock() { }
sl@0: };
sl@0: 
sl@0: #if BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_NONE
sl@0:   typedef null_mutex default_mutex;
sl@0: #elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_WIN32
sl@0:   typedef win32_mutex default_mutex;
sl@0: #elif BOOST_MUTEX_HELPER == BOOST_MUTEX_HELPER_PTHREAD
sl@0:   typedef pthread_mutex default_mutex;
sl@0: #endif
sl@0: 
sl@0: } // namespace pool
sl@0: } // namespace details
sl@0: 
sl@0: } // namespace boost
sl@0: 
sl@0: #undef BOOST_MUTEX_HELPER_WIN32
sl@0: #undef BOOST_MUTEX_HELPER_PTHREAD
sl@0: #undef BOOST_MUTEX_HELPER_NONE
sl@0: #undef BOOST_MUTEX_HELPER
sl@0: 
sl@0: #endif