Sweden-Number/scheduler/critsection.c

230 lines
6.6 KiB
C

/*
* Win32 critical sections
*
* Copyright 1998 Alexandre Julliard
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include "winerror.h"
#include "winbase.h"
#include "ntddk.h"
#include "heap.h"
#include "debugtools.h"
#include "thread.h"
DEFAULT_DEBUG_CHANNEL(win32);
DECLARE_DEBUG_CHANNEL(relay);
/***********************************************************************
* InitializeCriticalSection (KERNEL32.472)
*/
void WINAPI InitializeCriticalSection( CRITICAL_SECTION *crit )
{
NTSTATUS ret = RtlInitializeCriticalSection( crit );
if (ret) RtlRaiseStatus( ret );
}
/***********************************************************************
* InitializeCriticalSectionAndSpinCount (KERNEL32)
*/
BOOL WINAPI InitializeCriticalSectionAndSpinCount( CRITICAL_SECTION *crit, DWORD spincount )
{
NTSTATUS ret = RtlInitializeCriticalSectionAndSpinCount( crit, spincount );
if (ret) RtlRaiseStatus( ret );
return !ret;
}
/***********************************************************************
* SetCriticalSectionSpinCount (KERNEL32)
* This function is available on NT4SP3 or later, but not Win98
* It is SMP related
*/
DWORD WINAPI SetCriticalSectionSpinCount( CRITICAL_SECTION *crit, DWORD spincount )
{
ULONG_PTR oldspincount = crit->SpinCount;
if(spincount) FIXME("critsection=%p: spincount=%ld not supported\n", crit, spincount);
crit->SpinCount = spincount;
return oldspincount;
}
/***********************************************************************
* MakeCriticalSectionGlobal (KERNEL32.515)
*/
void WINAPI MakeCriticalSectionGlobal( CRITICAL_SECTION *crit )
{
/* let's assume that only one thread at a time will try to do this */
HANDLE sem = crit->LockSemaphore;
if (!sem) NtCreateSemaphore( &sem, SEMAPHORE_ALL_ACCESS, NULL, 0, 1 );
crit->LockSemaphore = ConvertToGlobalHandle( sem );
}
/***********************************************************************
* ReinitializeCriticalSection (KERNEL32.581)
*/
void WINAPI ReinitializeCriticalSection( CRITICAL_SECTION *crit )
{
if ( !crit->LockSemaphore )
RtlInitializeCriticalSection( crit );
}
/***********************************************************************
* UninitializeCriticalSection (KERNEL32.703)
*/
void WINAPI UninitializeCriticalSection( CRITICAL_SECTION *crit )
{
RtlDeleteCriticalSection( crit );
}
#ifdef __i386__
/***********************************************************************
* InterlockCompareExchange (KERNEL32.@)
*/
PVOID WINAPI InterlockedCompareExchange( PVOID *dest, PVOID xchg, PVOID compare );
__ASM_GLOBAL_FUNC(InterlockedCompareExchange,
"movl 12(%esp),%eax\n\t"
"movl 8(%esp),%ecx\n\t"
"movl 4(%esp),%edx\n\t"
"lock; cmpxchgl %ecx,(%edx)\n\t"
"ret $12");
/***********************************************************************
* InterlockedExchange (KERNEL32.@)
*/
LONG WINAPI InterlockedExchange( PLONG dest, LONG val );
__ASM_GLOBAL_FUNC(InterlockedExchange,
"movl 8(%esp),%eax\n\t"
"movl 4(%esp),%edx\n\t"
"lock; xchgl %eax,(%edx)\n\t"
"ret $8");
/***********************************************************************
* InterlockedExchangeAdd (KERNEL32.@)
*/
LONG WINAPI InterlockedExchangeAdd( PLONG dest, LONG incr );
__ASM_GLOBAL_FUNC(InterlockedExchangeAdd,
"movl 8(%esp),%eax\n\t"
"movl 4(%esp),%edx\n\t"
"lock; xaddl %eax,(%edx)\n\t"
"ret $8");
/***********************************************************************
* InterlockedIncrement (KERNEL32.@)
*/
LONG WINAPI InterlockedIncrement( PLONG dest );
__ASM_GLOBAL_FUNC(InterlockedIncrement,
"movl 4(%esp),%edx\n\t"
"movl $1,%eax\n\t"
"lock; xaddl %eax,(%edx)\n\t"
"incl %eax\n\t"
"ret $4");
/***********************************************************************
* InterlockDecrement (KERNEL32.@)
*/
LONG WINAPI InterlockedDecrement( PLONG dest );
__ASM_GLOBAL_FUNC(InterlockedDecrement,
"movl 4(%esp),%edx\n\t"
"movl $-1,%eax\n\t"
"lock; xaddl %eax,(%edx)\n\t"
"decl %eax\n\t"
"ret $4");
#elif defined(__sparc__) && defined(__sun__)
/*
* As the earlier Sparc processors lack necessary atomic instructions,
* I'm simply falling back to the library-provided _lwp_mutex routines
* to ensure mutual exclusion in a way appropriate for the current
* architecture.
*
* FIXME: If we have the compare-and-swap instruction (Sparc v9 and above)
* we could use this to speed up the Interlocked operations ...
*/
#include <synch.h>
static lwp_mutex_t interlocked_mutex = DEFAULTMUTEX;
/***********************************************************************
* InterlockedCompareExchange (KERNEL32.@)
*/
PVOID WINAPI InterlockedCompareExchange( PVOID *dest, PVOID xchg, PVOID compare )
{
_lwp_mutex_lock( &interlocked_mutex );
if ( *dest == compare )
*dest = xchg;
else
compare = *dest;
_lwp_mutex_unlock( &interlocked_mutex );
return compare;
}
/***********************************************************************
* InterlockedExchange (KERNEL32.@)
*/
LONG WINAPI InterlockedExchange( PLONG dest, LONG val )
{
LONG retv;
_lwp_mutex_lock( &interlocked_mutex );
retv = *dest;
*dest = val;
_lwp_mutex_unlock( &interlocked_mutex );
return retv;
}
/***********************************************************************
* InterlockedExchangeAdd (KERNEL32.@)
*/
LONG WINAPI InterlockedExchangeAdd( PLONG dest, LONG incr )
{
LONG retv;
_lwp_mutex_lock( &interlocked_mutex );
retv = *dest;
*dest += incr;
_lwp_mutex_unlock( &interlocked_mutex );
return retv;
}
/***********************************************************************
* InterlockedIncrement (KERNEL32.@)
*/
LONG WINAPI InterlockedIncrement( PLONG dest )
{
LONG retv;
_lwp_mutex_lock( &interlocked_mutex );
retv = ++*dest;
_lwp_mutex_unlock( &interlocked_mutex );
return retv;
}
/***********************************************************************
* InterlockedDecrement (KERNEL32.@)
*/
LONG WINAPI InterlockedDecrement( PLONG dest )
{
LONG retv;
_lwp_mutex_lock( &interlocked_mutex );
retv = --*dest;
_lwp_mutex_unlock( &interlocked_mutex );
return retv;
}
#else
#error You must implement the Interlocked* functions for your CPU
#endif