mirror of
https://github.com/reactos/wine.git
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204 lines
6.4 KiB
C
204 lines
6.4 KiB
C
/*
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* Fiber support
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*
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* Copyright 2002 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* FIXME:
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* - proper handling of 16-bit stack and signal stack
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <setjmp.h>
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#include <stdarg.h>
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#define NONAMELESSUNION
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#include "windef.h"
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#include "winbase.h"
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#include "winerror.h"
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#include "winternl.h"
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#include "wine/exception.h"
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#include "wine/library.h"
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struct fiber_data
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{
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LPVOID param; /* 00 fiber param */
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void *except; /* 04 saved exception handlers list */
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void *stack_base; /* 08 top of fiber stack */
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void *stack_limit; /* 0c fiber stack low-water mark */
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void *stack_allocation; /* 10 base of the fiber stack allocation */
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sigjmp_buf jmpbuf; /* 14 setjmp buffer (on Windows: CONTEXT) */
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DWORD flags; /* fiber flags */
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LPFIBER_START_ROUTINE start; /* start routine */
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};
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/* call the fiber initial function once we have switched stack */
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static void start_fiber( void *arg )
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{
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struct fiber_data *fiber = arg;
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LPFIBER_START_ROUTINE start = fiber->start;
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__TRY
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{
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fiber->start = NULL;
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start( fiber->param );
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ExitThread( 1 );
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}
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__EXCEPT(UnhandledExceptionFilter)
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{
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TerminateThread( GetCurrentThread(), GetExceptionCode() );
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}
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__ENDTRY
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}
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/***********************************************************************
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* CreateFiber (KERNEL32.@)
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*/
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LPVOID WINAPI CreateFiber( SIZE_T stack, LPFIBER_START_ROUTINE start, LPVOID param )
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{
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return CreateFiberEx( stack, 0, 0, start, param );
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}
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/***********************************************************************
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* CreateFiberEx (KERNEL32.@)
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*/
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LPVOID WINAPI CreateFiberEx( SIZE_T stack_commit, SIZE_T stack_reserve, DWORD flags,
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LPFIBER_START_ROUTINE start, LPVOID param )
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{
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struct fiber_data *fiber;
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if (!(fiber = HeapAlloc( GetProcessHeap(), 0, sizeof(*fiber) )))
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{
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SetLastError( ERROR_NOT_ENOUGH_MEMORY );
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return NULL;
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}
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/* FIXME: should use the thread stack allocation routines here */
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if (!stack_reserve) stack_reserve = 1024*1024;
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if(!(fiber->stack_allocation = VirtualAlloc( 0, stack_reserve, MEM_COMMIT, PAGE_READWRITE )))
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{
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HeapFree( GetProcessHeap(), 0, fiber );
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return NULL;
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}
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fiber->stack_base = (char *)fiber->stack_allocation + stack_reserve;
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fiber->stack_limit = fiber->stack_allocation;
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fiber->param = param;
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fiber->except = (void *)-1;
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fiber->start = start;
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fiber->flags = flags;
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return fiber;
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}
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/***********************************************************************
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* DeleteFiber (KERNEL32.@)
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*/
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void WINAPI DeleteFiber( LPVOID fiber_ptr )
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{
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struct fiber_data *fiber = fiber_ptr;
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if (!fiber) return;
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if (fiber == NtCurrentTeb()->Tib.u.FiberData)
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{
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HeapFree( GetProcessHeap(), 0, fiber );
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ExitThread(1);
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}
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VirtualFree( fiber->stack_allocation, 0, MEM_RELEASE );
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HeapFree( GetProcessHeap(), 0, fiber );
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}
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/***********************************************************************
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* ConvertThreadToFiber (KERNEL32.@)
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*/
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LPVOID WINAPI ConvertThreadToFiber( LPVOID param )
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{
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return ConvertThreadToFiberEx( param, 0 );
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}
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/***********************************************************************
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* ConvertThreadToFiberEx (KERNEL32.@)
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*/
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LPVOID WINAPI ConvertThreadToFiberEx( LPVOID param, DWORD flags )
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{
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struct fiber_data *fiber;
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if (!(fiber = HeapAlloc( GetProcessHeap(), 0, sizeof(*fiber) )))
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{
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SetLastError( ERROR_NOT_ENOUGH_MEMORY );
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return NULL;
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}
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fiber->param = param;
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fiber->except = NtCurrentTeb()->Tib.ExceptionList;
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fiber->stack_base = NtCurrentTeb()->Tib.StackBase;
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fiber->stack_limit = NtCurrentTeb()->Tib.StackLimit;
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fiber->stack_allocation = NtCurrentTeb()->DeallocationStack;
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fiber->start = NULL;
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fiber->flags = flags;
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NtCurrentTeb()->Tib.u.FiberData = fiber;
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return fiber;
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}
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/***********************************************************************
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* ConvertFiberToThread (KERNEL32.@)
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*/
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BOOL WINAPI ConvertFiberToThread(void)
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{
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struct fiber_data *fiber = NtCurrentTeb()->Tib.u.FiberData;
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if (fiber)
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{
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NtCurrentTeb()->Tib.u.FiberData = NULL;
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HeapFree( GetProcessHeap(), 0, fiber );
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}
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return TRUE;
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}
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/***********************************************************************
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* SwitchToFiber (KERNEL32.@)
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*/
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void WINAPI SwitchToFiber( LPVOID fiber )
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{
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struct fiber_data *new_fiber = fiber;
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struct fiber_data *current_fiber = NtCurrentTeb()->Tib.u.FiberData;
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current_fiber->except = NtCurrentTeb()->Tib.ExceptionList;
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current_fiber->stack_limit = NtCurrentTeb()->Tib.StackLimit;
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/* stack_allocation and stack_base never change */
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/* FIXME: should save floating point context if requested in fiber->flags */
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if (!sigsetjmp( current_fiber->jmpbuf, 1 ))
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{
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NtCurrentTeb()->Tib.u.FiberData = new_fiber;
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NtCurrentTeb()->Tib.ExceptionList = new_fiber->except;
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NtCurrentTeb()->Tib.StackBase = new_fiber->stack_base;
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NtCurrentTeb()->Tib.StackLimit = new_fiber->stack_limit;
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NtCurrentTeb()->DeallocationStack = new_fiber->stack_allocation;
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if (new_fiber->start) /* first time */
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wine_switch_to_stack( start_fiber, new_fiber, new_fiber->stack_base );
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else
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siglongjmp( new_fiber->jmpbuf, 1 );
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}
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}
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