/*
 * PThreads.hh
 *
 * Copyright 2002, Emiliano Martin emilianomc@terra.es All rights reserved.
 *
 * See the COPYING file for the terms of usage and distribution.
 */

#ifndef _LOG4CPP_THREADING_PTHREADS_HH
#define _LOG4CPP_THREADING_PTHREADS_HH

#include <assert.h>
#include <log4cpp/Portability.hh>
#include <pthread.h>
#include <stdio.h>
#include <string>

namespace log4cpp {
    namespace threading {

        /**
         * returns the thread ID
         **/
        std::string getThreadId();

        /**
         **/
        class Mutex {
          private:
            pthread_mutex_t mutex;

          public:
            inline Mutex() {
                ::pthread_mutex_init(&mutex, NULL);
            }

            inline void lock() {
                ::pthread_mutex_lock(&mutex);
            }

            inline void unlock() {
                ::pthread_mutex_unlock(&mutex);
            }

            inline ~Mutex() {
                ::pthread_mutex_destroy(&mutex);
            }

          private:
            Mutex(const Mutex& m);
            Mutex& operator=(const Mutex& m);
        };

        /**
         *	definition of ScopedLock;
         **/
        class ScopedLock {
          private:
            Mutex& _mutex;

          public:
            inline ScopedLock(Mutex& mutex) : _mutex(mutex) {
                _mutex.lock();
            }

            inline ~ScopedLock() {
                _mutex.unlock();
            }
        };

        /**
         *
         **/
        template <typename T> class ThreadLocalDataHolder {
          private:
            pthread_key_t _key;

          public:
            typedef T data_type;

            inline ThreadLocalDataHolder() {
                ::pthread_key_create(&_key, freeHolder);
            }

            inline static void freeHolder(void* p) {
                assert(p != NULL);
                delete reinterpret_cast<T*>(p);
            }

            inline ~ThreadLocalDataHolder() {
                T* data = get();
                if (data != NULL) {
                    delete data;
                }
                ::pthread_key_delete(_key);
            }

            inline T* get() const {
                return reinterpret_cast<T*>(::pthread_getspecific(_key));
            }

            inline T* operator->() const {
                return get();
            }
            inline T& operator*() const {
                return *get();
            }

            inline T* release() {
                T* result = get();
                ::pthread_setspecific(_key, NULL);

                return result;
            }

            inline void reset(T* p = NULL) {
                T* data = get();
                if (data != NULL) {
                    delete data;
                }
                ::pthread_setspecific(_key, p);
            }
        };

    } // namespace threading
} // namespace log4cpp
#endif
