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sys, dll: convert memory barriers to interlocked operations

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This commit is contained in:
Bill Zissimopoulos
2022-01-19 10:55:46 +00:00
parent 362b9ceb7c
commit 29251dc2be
10 changed files with 55 additions and 64 deletions
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22
src/dll/dirbuf.c
View File

@@ -227,8 +227,7 @@ static inline VOID FspFileSystemSortDirectoryBuffer(FSP_FILE_SYSTEM_DIRECTORY_BU
FSP_API BOOLEAN FspFileSystemAcquireDirectoryBuffer(PVOID *PDirBuffer,
BOOLEAN Reset, PNTSTATUS PResult)
{
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = *PDirBuffer;
MemoryBarrier();
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = FspInterlockedLoadPointer(PDirBuffer);
if (0 == DirBuffer)
{
@@ -243,10 +242,9 @@ FSP_API BOOLEAN FspFileSystemAcquireDirectoryBuffer(PVOID *PDirBuffer,
AcquireSRWLockExclusive(&NewDirBuffer->Lock);
AcquireSRWLockExclusive(&CreateLock);
DirBuffer = *PDirBuffer;
MemoryBarrier();
DirBuffer = FspInterlockedLoadPointer(PDirBuffer);
if (0 == DirBuffer)
*PDirBuffer = DirBuffer = NewDirBuffer;
FspInterlockedStorePointer(PDirBuffer, DirBuffer = NewDirBuffer);
ReleaseSRWLockExclusive(&CreateLock);
if (DirBuffer == NewDirBuffer)
@@ -274,7 +272,7 @@ FSP_API BOOLEAN FspFileSystemFillDirectoryBuffer(PVOID *PDirBuffer,
{
/* assume that FspFileSystemAcquireDirectoryBuffer has been called */
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = *PDirBuffer;
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = FspInterlockedLoadPointer(PDirBuffer);
ULONG Capacity, LoMark, HiMark;
PUINT8 Buffer;
@@ -333,7 +331,7 @@ FSP_API VOID FspFileSystemReleaseDirectoryBuffer(PVOID *PDirBuffer)
{
/* assume that FspFileSystemAcquireDirectoryBuffer has been called */
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = *PDirBuffer;
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = FspInterlockedLoadPointer(PDirBuffer);
/* eliminate invalidated entries from the index */
PULONG Index = (PULONG)(DirBuffer->Buffer + DirBuffer->HiMark);
@@ -356,8 +354,7 @@ FSP_API VOID FspFileSystemReadDirectoryBuffer(PVOID *PDirBuffer,
PWSTR Marker,
PVOID Buffer, ULONG Length, PULONG PBytesTransferred)
{
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = *PDirBuffer;
MemoryBarrier();
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = FspInterlockedLoadPointer(PDirBuffer);
if (0 != DirBuffer)
{
@@ -396,14 +393,13 @@ FSP_API VOID FspFileSystemReadDirectoryBuffer(PVOID *PDirBuffer,
FSP_API VOID FspFileSystemDeleteDirectoryBuffer(PVOID *PDirBuffer)
{
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = *PDirBuffer;
MemoryBarrier();
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = FspInterlockedLoadPointer(PDirBuffer);
if (0 != DirBuffer)
{
MemFree(DirBuffer->Buffer);
MemFree(DirBuffer);
*PDirBuffer = 0;
FspInterlockedStorePointer(PDirBuffer, 0);
}
}
@@ -412,7 +408,7 @@ VOID FspFileSystemPeekInDirectoryBuffer(PVOID *PDirBuffer,
{
/* assume that FspFileSystemAcquireDirectoryBuffer has been called */
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = *PDirBuffer;
FSP_FILE_SYSTEM_DIRECTORY_BUFFER *DirBuffer = FspInterlockedLoadPointer(PDirBuffer);
*PBuffer = DirBuffer->Buffer;
*PIndex = (PULONG)(DirBuffer->Buffer + DirBuffer->HiMark);

9
src/dll/service.c
View File

@@ -275,8 +275,7 @@ FSP_API NTSTATUS FspServiceLoop(FSP_SERVICE *Service)
else
{
ResetEvent(FspServiceConsoleModeEvent);
FspServiceConsoleCtrlHandlerDisabled = 0;
MemoryBarrier();
FspInterlockedStore32((INT32 *)&FspServiceConsoleCtrlHandlerDisabled, 0);
}
#endif
@@ -326,8 +325,7 @@ FSP_API NTSTATUS FspServiceLoop(FSP_SERVICE *Service)
*
* What we do instead is disable our handler by setting a variable.
*/
FspServiceConsoleCtrlHandlerDisabled = 1;
MemoryBarrier();
FspInterlockedStore32((INT32 *)&FspServiceConsoleCtrlHandlerDisabled, 1);
}
Result = STATUS_SUCCESS;
@@ -517,8 +515,7 @@ static DWORD WINAPI FspServiceConsoleModeThread(PVOID Context)
/* expose FspServiceConsoleCtrlHandler so it can be used from fsp_fuse_signal_handler */
BOOL WINAPI FspServiceConsoleCtrlHandler(DWORD CtrlType)
{
UINT32 Disabled = FspServiceConsoleCtrlHandlerDisabled;
MemoryBarrier();
UINT32 Disabled = FspInterlockedLoad32((INT32 *)&FspServiceConsoleCtrlHandlerDisabled);
if (Disabled)
return FALSE;