$search
00001 // 00002 // posix_tss_ptr.hpp 00003 // ~~~~~~~~~~~~~~~~~ 00004 // 00005 // Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com) 00006 // 00007 // Distributed under the Boost Software License, Version 1.0. (See accompanying 00008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 00009 // 00010 00011 #ifndef ASIO_DETAIL_POSIX_TSS_PTR_HPP 00012 #define ASIO_DETAIL_POSIX_TSS_PTR_HPP 00013 00014 #if defined(_MSC_VER) && (_MSC_VER >= 1200) 00015 # pragma once 00016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) 00017 00018 #include "asio/detail/push_options.hpp" 00019 00020 #include "asio/detail/push_options.hpp" 00021 #include <boost/config.hpp> 00022 #include "asio/detail/pop_options.hpp" 00023 00024 #if defined(BOOST_HAS_PTHREADS) 00025 00026 #include "asio/detail/push_options.hpp" 00027 #include <boost/throw_exception.hpp> 00028 #include <pthread.h> 00029 #include "asio/detail/pop_options.hpp" 00030 00031 #include "asio/error.hpp" 00032 #include "asio/system_error.hpp" 00033 #include "asio/detail/noncopyable.hpp" 00034 00035 namespace asio { 00036 namespace detail { 00037 00038 template <typename T> 00039 class posix_tss_ptr 00040 : private noncopyable 00041 { 00042 public: 00043 // Constructor. 00044 posix_tss_ptr() 00045 { 00046 int error = ::pthread_key_create(&tss_key_, 0); 00047 if (error != 0) 00048 { 00049 asio::system_error e( 00050 asio::error_code(error, 00051 asio::error::get_system_category()), 00052 "tss"); 00053 boost::throw_exception(e); 00054 } 00055 } 00056 00057 // Destructor. 00058 ~posix_tss_ptr() 00059 { 00060 ::pthread_key_delete(tss_key_); 00061 } 00062 00063 // Get the value. 00064 operator T*() const 00065 { 00066 return static_cast<T*>(::pthread_getspecific(tss_key_)); 00067 } 00068 00069 // Set the value. 00070 void operator=(T* value) 00071 { 00072 ::pthread_setspecific(tss_key_, value); 00073 } 00074 00075 private: 00076 // Thread-specific storage to allow unlocked access to determine whether a 00077 // thread is a member of the pool. 00078 pthread_key_t tss_key_; 00079 }; 00080 00081 } // namespace detail 00082 } // namespace asio 00083 00084 #endif // defined(BOOST_HAS_PTHREADS) 00085 00086 #include "asio/detail/pop_options.hpp" 00087 00088 #endif // ASIO_DETAIL_POSIX_TSS_PTR_HPP