Sweden-Number/scheduler/fiber.c

188 lines
5.7 KiB
C

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