boost/thread/win32/once.hpp
#ifndef BOOST_THREAD_WIN32_ONCE_HPP #define BOOST_THREAD_WIN32_ONCE_HPP // once.hpp // // (C) Copyright 2005-7 Anthony Williams // (C) Copyright 2005 John Maddock // (C) Copyright 2011-2013 Vicente J. Botet Escriba // // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #include <cstring> #include <cstddef> #include <boost/assert.hpp> #include <boost/static_assert.hpp> #include <boost/detail/interlocked.hpp> #include <boost/thread/win32/thread_primitives.hpp> #include <boost/thread/win32/interlocked_read.hpp> #include <boost/core/no_exceptions_support.hpp> #include <boost/thread/detail/move.hpp> #include <boost/thread/detail/invoke.hpp> #include <boost/bind.hpp> #include <boost/config/abi_prefix.hpp> #ifdef BOOST_NO_STDC_NAMESPACE namespace std { using ::memcpy; using ::ptrdiff_t; } #endif namespace boost { struct once_flag; namespace detail { struct once_context; inline bool enter_once_region(once_flag& flag, once_context& ctx) BOOST_NOEXCEPT; inline void commit_once_region(once_flag& flag, once_context& ctx) BOOST_NOEXCEPT; inline void rollback_once_region(once_flag& flag, once_context& ctx) BOOST_NOEXCEPT; } #ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11 struct once_flag { BOOST_THREAD_NO_COPYABLE(once_flag) BOOST_CONSTEXPR once_flag() BOOST_NOEXCEPT : status(0), count(0) {} long status; long count; private: friend inline bool enter_once_region(once_flag& flag, detail::once_context& ctx) BOOST_NOEXCEPT; friend inline void commit_once_region(once_flag& flag, detail::once_context& ctx) BOOST_NOEXCEPT; friend inline void rollback_once_region(once_flag& flag, detail::once_context& ctx) BOOST_NOEXCEPT; }; #define BOOST_ONCE_INIT once_flag() #else // BOOST_THREAD_PROVIDES_ONCE_CXX11 struct once_flag { long status; long count; }; #define BOOST_ONCE_INIT {0,0} #endif // BOOST_THREAD_PROVIDES_ONCE_CXX11 #if defined BOOST_THREAD_PROVIDES_INVOKE #define BOOST_THREAD_INVOKE_RET_VOID detail::invoke #define BOOST_THREAD_INVOKE_RET_VOID_CALL #elif defined BOOST_THREAD_PROVIDES_INVOKE_RET #define BOOST_THREAD_INVOKE_RET_VOID detail::invoke<void> #define BOOST_THREAD_INVOKE_RET_VOID_CALL #else #define BOOST_THREAD_INVOKE_RET_VOID boost::bind #define BOOST_THREAD_INVOKE_RET_VOID_CALL () #endif namespace detail { #ifdef BOOST_NO_ANSI_APIS typedef wchar_t once_char_type; #else typedef char once_char_type; #endif unsigned const once_mutex_name_fixed_length=54; unsigned const once_mutex_name_length=once_mutex_name_fixed_length+ sizeof(void*)*2+sizeof(unsigned long)*2+1; template <class I> void int_to_string(I p, once_char_type* buf) { for(unsigned i=0; i < sizeof(I)*2; ++i,++buf) { #ifdef BOOST_NO_ANSI_APIS once_char_type const a=L'A'; #else once_char_type const a='A'; #endif *buf = a + static_cast<once_char_type>((p >> (i*4)) & 0x0f); } *buf = 0; } inline void name_once_mutex(once_char_type* mutex_name,void* flag_address) { #ifdef BOOST_NO_ANSI_APIS static const once_char_type fixed_mutex_name[]=L"Local\\{C15730E2-145C-4c5e-B005-3BC753F42475}-once-flag"; #else static const once_char_type fixed_mutex_name[]="Local\\{C15730E2-145C-4c5e-B005-3BC753F42475}-once-flag"; #endif BOOST_STATIC_ASSERT(sizeof(fixed_mutex_name) == (sizeof(once_char_type)*(once_mutex_name_fixed_length+1))); std::memcpy(mutex_name,fixed_mutex_name,sizeof(fixed_mutex_name)); detail::int_to_string(reinterpret_cast<std::ptrdiff_t>(flag_address), mutex_name + once_mutex_name_fixed_length); detail::int_to_string(winapi::GetCurrentProcessId(), mutex_name + once_mutex_name_fixed_length + sizeof(void*)*2); } inline void* open_once_event(once_char_type* mutex_name,void* flag_address) { if(!*mutex_name) { name_once_mutex(mutex_name,flag_address); } #ifdef BOOST_NO_ANSI_APIS return ::boost::winapi::OpenEventW( #else return ::boost::winapi::OpenEventA( #endif ::boost::detail::win32::synchronize | ::boost::detail::win32::event_modify_state, false, mutex_name); } inline void* create_once_event(once_char_type* mutex_name,void* flag_address) { if(!*mutex_name) { name_once_mutex(mutex_name,flag_address); } return ::boost::detail::win32::create_event( mutex_name, ::boost::detail::win32::manual_reset_event, ::boost::detail::win32::event_initially_reset); } struct once_context { long const function_complete_flag_value; long const running_value; bool counted; detail::win32::handle_manager event_handle; detail::once_char_type mutex_name[once_mutex_name_length]; once_context() : function_complete_flag_value(0xc15730e2), running_value(0x7f0725e3), counted(false) { mutex_name[0]=0; } }; enum once_action {try_, break_, continue_}; inline bool enter_once_region(once_flag& flag, once_context& ctx) BOOST_NOEXCEPT { long status=BOOST_INTERLOCKED_COMPARE_EXCHANGE(&flag.status,ctx.running_value,0); if(!status) { if(!ctx.event_handle) { ctx.event_handle=detail::open_once_event(ctx.mutex_name,&flag); } if(ctx.event_handle) { ::boost::winapi::ResetEvent(ctx.event_handle); } return true; } return false; } inline void commit_once_region(once_flag& flag, once_context& ctx) BOOST_NOEXCEPT { if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; } BOOST_INTERLOCKED_EXCHANGE(&flag.status,ctx.function_complete_flag_value); if(!ctx.event_handle && (::boost::detail::interlocked_read_acquire(&flag.count)>1)) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); } if(ctx.event_handle) { ::boost::winapi::SetEvent(ctx.event_handle); } } inline void rollback_once_region(once_flag& flag, once_context& ctx) BOOST_NOEXCEPT { BOOST_INTERLOCKED_EXCHANGE(&flag.status,0); if(!ctx.event_handle) { ctx.event_handle=detail::open_once_event(ctx.mutex_name,&flag); } if(ctx.event_handle) { ::boost::winapi::SetEvent(ctx.event_handle); } } } #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) //#if defined(BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNCTION_PTR) inline void call_once(once_flag& flag, void (*f)()) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f(); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite, 0)); } } //#endif template<typename Function> inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f(); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, class A, class ...ArgTypes> inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(A) a, BOOST_THREAD_RV_REF(ArgTypes)... args) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID( thread_detail::decay_copy(boost::forward<Function>(f)), thread_detail::decay_copy(boost::forward<A>(a)), thread_detail::decay_copy(boost::forward<ArgTypes>(args))... ) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } #else #if ! defined(BOOST_MSVC) && ! defined(BOOST_INTEL) template<typename Function> void call_once(once_flag& flag,Function f) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f(); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1> void call_once(once_flag& flag,Function f, T1 p1) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID(f,p1) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1, typename T2> void call_once(once_flag& flag,Function f, T1 p1, T2 p2) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID(f,p1,p2) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1, typename T2, typename T3> void call_once(once_flag& flag,Function f, T1 p1, T2 p2, T3 p3) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID(f,p1,p2,p3) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } #elif defined BOOST_NO_CXX11_RVALUE_REFERENCES template<typename Function> void call_once(once_flag& flag,Function const&f) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f(); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1> void call_once(once_flag& flag,Function const&f, T1 const&p1) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID(f,p1) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1, typename T2> void call_once(once_flag& flag,Function const&f, T1 const&p1, T2 const&p2) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID(f,p1,p2) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1, typename T2, typename T3> void call_once(once_flag& flag,Function const&f, T1 const&p1, T2 const&p2, T3 const&p3) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID(f,p1,p2,p3) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } #endif #if 1 #if defined(BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNCTION_PTR) inline void call_once(once_flag& flag, void (*f)()) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f(); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename T1> void call_once(once_flag& flag,void (*f)(BOOST_THREAD_RV_REF(T1)), BOOST_THREAD_RV_REF(T1) p1) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f( thread_detail::decay_copy(boost::forward<T1>(p1)) ); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1, typename T2> void call_once(once_flag& flag,void (*f)(BOOST_THREAD_RV_REF(T1),BOOST_THREAD_RV_REF(T2)), BOOST_THREAD_RV_REF(T1) p1, BOOST_THREAD_RV_REF(T2) p2) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f( thread_detail::decay_copy(boost::forward<T1>(p1)), thread_detail::decay_copy(boost::forward<T2>(p2)) ); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1, typename T2, typename T3> void call_once(once_flag& flag,void (*f)(BOOST_THREAD_RV_REF(T1),BOOST_THREAD_RV_REF(T2)), BOOST_THREAD_RV_REF(T1) p1, BOOST_THREAD_RV_REF(T2) p2, BOOST_THREAD_RV_REF(T3) p3) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f( thread_detail::decay_copy(boost::forward<T1>(p1)), thread_detail::decay_copy(boost::forward<T2>(p2)), thread_detail::decay_copy(boost::forward<T3>(p3)) ); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } #endif template<typename Function> void call_once(once_flag& flag,BOOST_THREAD_RV_REF(Function) f) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { f(); } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1> void call_once(once_flag& flag,BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID( thread_detail::decay_copy(boost::forward<Function>(f)), thread_detail::decay_copy(boost::forward<T1>(p1)) ) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1, typename T2> void call_once(once_flag& flag,BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1, BOOST_THREAD_RV_REF(T2) p2) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID( thread_detail::decay_copy(boost::forward<Function>(f)), thread_detail::decay_copy(boost::forward<T1>(p1)), thread_detail::decay_copy(boost::forward<T2>(p2)) ) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } template<typename Function, typename T1, typename T2, typename T3> void call_once(once_flag& flag,BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1, BOOST_THREAD_RV_REF(T2) p2, BOOST_THREAD_RV_REF(T3) p3) { // Try for a quick win: if the procedure has already been called // just skip through: detail::once_context ctx; while(::boost::detail::interlocked_read_acquire(&flag.status) !=ctx.function_complete_flag_value) { if(detail::enter_once_region(flag, ctx)) { BOOST_TRY { BOOST_THREAD_INVOKE_RET_VOID( thread_detail::decay_copy(boost::forward<Function>(f)), thread_detail::decay_copy(boost::forward<T1>(p1)), thread_detail::decay_copy(boost::forward<T2>(p2)), thread_detail::decay_copy(boost::forward<T3>(p3)) ) BOOST_THREAD_INVOKE_RET_VOID_CALL; } BOOST_CATCH(...) { detail::rollback_once_region(flag, ctx); BOOST_RETHROW } BOOST_CATCH_END detail::commit_once_region(flag, ctx); break; } if(!ctx.counted) { BOOST_INTERLOCKED_INCREMENT(&flag.count); ctx.counted=true; long status=::boost::detail::interlocked_read_acquire(&flag.status); if(status==ctx.function_complete_flag_value) { break; } if(!ctx.event_handle) { ctx.event_handle=detail::create_once_event(ctx.mutex_name,&flag); continue; } } BOOST_VERIFY(!::boost::winapi::WaitForSingleObjectEx( ctx.event_handle,::boost::detail::win32::infinite,0)); } } #endif #endif } #include <boost/config/abi_suffix.hpp> #endif