202 lines
5.0 KiB
C
202 lines
5.0 KiB
C
/*
|
|
* Win32 kernel functions
|
|
*
|
|
* Copyright 1995 Martin von Loewis
|
|
* Copyright 1997 Onno Hovers
|
|
*/
|
|
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include "windef.h"
|
|
#include "winerror.h"
|
|
#include "debug.h"
|
|
|
|
|
|
/*
|
|
* FIXME:
|
|
* The c functions do not protect from non-interlocked accesses
|
|
* This is no problem as long as we do not have multiple Win32 threads
|
|
* or processes.
|
|
* The assembly macro's do protect from non-interlocked access,
|
|
* but they will only work for i386 systems with GCC.
|
|
*/
|
|
|
|
/************************************************************************
|
|
* InterlockedIncrement [KERNEL32] *
|
|
* *
|
|
* InterlockedIncrement adds 1 to a long variable and returns *
|
|
* - a negative number if the result < 0 *
|
|
* - zero if the result == 0 *
|
|
* - a positive number if the result > 0 *
|
|
* *
|
|
* The returned number need not be equal to the result!!!! *
|
|
************************************************************************/
|
|
|
|
LONG WINAPI InterlockedIncrement(LPLONG lpAddend)
|
|
{
|
|
#if defined(__i386__)&&defined(__GNUC__)
|
|
long ret;
|
|
__asm__
|
|
(
|
|
"\tlock\n" /* for SMP systems */
|
|
"\tincl (%1)\n"
|
|
"\tje 2f\n"
|
|
"\tjl 1f\n"
|
|
"\tincl %0\n"
|
|
"\tjmp 2f\n"
|
|
"1:\tdec %0\n"
|
|
"2:\n"
|
|
:"=r" (ret):"r" (lpAddend), "0" (0): "memory"
|
|
);
|
|
return ret;
|
|
#else
|
|
LONG ret;
|
|
/* StopAllThreadsAndProcesses() */
|
|
|
|
(*lpAddend)++;
|
|
ret=*lpAddend;
|
|
|
|
/* ResumeAllThreadsAndProcesses() */
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
/************************************************************************
|
|
* InterlockedDecrement [KERNEL32] *
|
|
* *
|
|
* InterlockedIncrement adds 1 to a long variable and returns *
|
|
* - a negative number if the result < 0 *
|
|
* - zero if the result == 0 *
|
|
* - a positive number if the result > 0 *
|
|
* *
|
|
* The returned number need not be equal to the result!!!! *
|
|
************************************************************************/
|
|
|
|
LONG WINAPI InterlockedDecrement(LPLONG lpAddend)
|
|
{
|
|
#if defined(__i386__)&&defined(__GNUC__)
|
|
LONG ret;
|
|
__asm__
|
|
(
|
|
"\tlock\n" /* for SMP systems */
|
|
"\tdecl (%1)\n"
|
|
"\tje 2f\n"
|
|
"\tjl 1f\n"
|
|
"\tincl %0\n"
|
|
"\tjmp 2f\n"
|
|
"1:\tdec %0\n"
|
|
"2:\n"
|
|
:"=r" (ret):"r" (lpAddend), "0" (0): "memory"
|
|
);
|
|
return ret;
|
|
#else
|
|
LONG ret;
|
|
/* StopAllThreadsAndProcesses() */
|
|
|
|
(*lpAddend)--;
|
|
ret=*lpAddend;
|
|
|
|
/* ResumeAllThreadsAndProcesses() */
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
/************************************************************************
|
|
* InterlockedExchange [KERNEL32.???]
|
|
*
|
|
* Atomically exchanges a pair of values.
|
|
*
|
|
* RETURNS
|
|
* Prior value of value pointed to by Target
|
|
*/
|
|
LONG WINAPI InterlockedExchange(
|
|
LPLONG target, /* Address of 32-bit value to exchange */
|
|
LONG value /* New value for the value pointed to by target */
|
|
) {
|
|
#if defined(__i386__)&&defined(__GNUC__)
|
|
LONG ret;
|
|
__asm__ ( /* lock for SMP systems */
|
|
"lock\n\txchgl %0,(%1)"
|
|
:"=r" (ret):"r" (target), "0" (value):"memory" );
|
|
return ret;
|
|
#else
|
|
LONG ret;
|
|
/* StopAllThreadsAndProcesses() */
|
|
|
|
ret=*target;
|
|
*target=value;
|
|
|
|
/* ResumeAllThreadsAndProcesses() */
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
/************************************************************************
|
|
* InterlockedCompareExchange [KERNEL32.879]
|
|
*
|
|
* Atomically compares Destination and Comperand, and if found equal exchanges
|
|
* the value of Destination with Exchange
|
|
*
|
|
* RETURNS
|
|
* Prior value of value pointed to by Destination
|
|
*/
|
|
PVOID WINAPI InterlockedCompareExchange(
|
|
PVOID *Destination, /* Address of 32-bit value to exchange */
|
|
PVOID Exchange, /* change value, 32 bits */
|
|
PVOID Comperand /* value to compare, 32 bits */
|
|
) {
|
|
#if defined(__i386__)&&defined(__GNUC__)
|
|
PVOID ret;
|
|
__asm__ ( /* lock for SMP systems */
|
|
"lock\n\t"
|
|
"cmpxchgl %2,(%1)"
|
|
:"=r" (ret)
|
|
:"r" (Destination),"r" (Exchange), "0" (Comperand)
|
|
:"memory" );
|
|
return ret;
|
|
#else
|
|
PVOID ret;
|
|
/* StopAllThreadsAndProcesses() */
|
|
|
|
ret=*Destination;
|
|
if(*Destination==Comperand) *Destination=Exchange;
|
|
|
|
/* ResumeAllThreadsAndProcesses() */
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
/************************************************************************
|
|
* InterlockedExchangeAdd [KERNEL32.880]
|
|
*
|
|
* Atomically adds Increment to Addend and returns the previous value of
|
|
* Addend
|
|
*
|
|
* RETURNS
|
|
* Prior value of value pointed to by cwAddendTarget
|
|
*/
|
|
LONG WINAPI InterlockedExchangeAdd(
|
|
PLONG Addend, /* Address of 32-bit value to exchange */
|
|
LONG Increment /* Value to add */
|
|
) {
|
|
#if defined(__i386__)&&defined(__GNUC__)
|
|
LONG ret;
|
|
__asm__ ( /* lock for SMP systems */
|
|
"lock\n\t"
|
|
"xaddl %0,(%1)"
|
|
:"=r" (ret)
|
|
:"r" (Addend), "0" (Increment)
|
|
:"memory" );
|
|
return ret;
|
|
#else
|
|
LONG ret;
|
|
/* StopAllThreadsAndProcesses() */
|
|
|
|
ret = *Addend;
|
|
*Addend += Increment;
|
|
|
|
/* ResumeAllThreadsAndProcesses() */
|
|
return ret;
|
|
#endif
|
|
}
|