PAL_ERROR
CorUnix::InternalCreateMutex(
CPalThread *pthr,
LPSECURITY_ATTRIBUTES lpMutexAttributes,
BOOL bInitialOwner,
LPCSTR lpName,
HANDLE *phMutex
)
{
CObjectAttributes oa(nullptr, lpMutexAttributes);
PAL_ERROR palError = NO_ERROR;
IPalObject *pobjMutex = NULL;
IPalObject *pobjRegisteredMutex = NULL;
ISynchStateController *pssc = NULL;
HANDLE hMutex = nullptr;
_ASSERTE(NULL != pthr);
_ASSERTE(NULL != phMutex);
ENTRY("InternalCreateMutex(pthr=%p, lpMutexAttributes=%p, bInitialOwner=%d"
", lpName=%p, phMutex=%p)\n",
pthr,
lpMutexAttributes,
bInitialOwner,
lpName,
phMutex
);
if (lpName != nullptr && lpName[0] == '\0')
{
// Empty name is treated as a request for an unnamed process-local mutex
lpName = nullptr;
}
CObjectType *ot = lpName == nullptr ? &otMutex : &otNamedMutex;
CAllowedObjectTypes *aot = lpName == nullptr ? &aotMutex : &aotNamedMutex;
palError = g_pObjectManager->AllocateObject(
pthr,
ot,
&oa,
&pobjMutex
);
if (NO_ERROR != palError)
{
goto InternalCreateMutexExit;
}
if (lpName == nullptr)
{
palError = pobjMutex->GetSynchStateController(
pthr,
&pssc
);
if (NO_ERROR != palError)
{
ASSERT("Unable to create state controller (%d)\n", palError);
goto InternalCreateMutexExit;
}
if (bInitialOwner)
{
palError = pssc->SetOwner(pthr);
}
else
{
palError = pssc->SetSignalCount(1);
}
pssc->ReleaseController();
if (NO_ERROR != palError)
{
ASSERT("Unable to set initial mutex state (%d)\n", palError);
goto InternalCreateMutexExit;
}
}
palError = g_pObjectManager->RegisterObject(
pthr,
pobjMutex,
aot,
0, // should be MUTEX_ALL_ACCESS -- currently ignored (no Win32 security)
&hMutex,
&pobjRegisteredMutex
);
if (palError != NO_ERROR)
{
_ASSERTE(palError != ERROR_ALREADY_EXISTS); // PAL's naming infrastructure is not used for named mutexes
_ASSERTE(pobjRegisteredMutex == nullptr);
_ASSERTE(hMutex == nullptr);
goto InternalCreateMutexExit;
}
// Now that the object has been registered successfully, it would have a reference associated with the handle, so release
// the initial reference. Any errors from now on need to revoke the handle.
_ASSERTE(pobjRegisteredMutex == pobjMutex);
_ASSERTE(hMutex != nullptr);
pobjMutex->ReleaseReference(pthr);
pobjRegisteredMutex = nullptr;
if (lpName != nullptr)
{
SharedMemoryProcessDataHeader *processDataHeader;
bool created = false;
try
{
processDataHeader = NamedMutexProcessData::CreateOrOpen(lpName, !!bInitialOwner, &created);
}
catch (SharedMemoryException ex)
{
palError = ex.GetErrorCode();
goto InternalCreateMutexExit;
}
SharedMemoryProcessDataHeader::PalObject_SetProcessDataHeader(pobjMutex, processDataHeader);
if (!created)
{
// Indicate to the caller that an existing mutex was opened, and hence the caller will not have initial ownership
// of the mutex if requested through bInitialOwner
palError = ERROR_ALREADY_EXISTS;
}
}
*phMutex = hMutex;
hMutex = nullptr;
pobjMutex = nullptr;
InternalCreateMutexExit:
_ASSERTE(pobjRegisteredMutex == nullptr);
if (hMutex != nullptr)
{
g_pObjectManager->RevokeHandle(pthr, hMutex);
}
else if (NULL != pobjMutex)
{
pobjMutex->ReleaseReference(pthr);
}
LOGEXIT("InternalCreateMutex returns %i\n", palError);
return palError;
}
PAL_ERROR
CorUnix::InternalCreateMutex(
CPalThread *pthr,
LPSECURITY_ATTRIBUTES lpMutexAttributes,
BOOL bInitialOwner,
LPCWSTR lpName,
HANDLE *phMutex
)
{
CObjectAttributes oa(lpName, lpMutexAttributes);
PAL_ERROR palError = NO_ERROR;
IPalObject *pobjMutex = NULL;
IPalObject *pobjRegisteredMutex = NULL;
ISynchStateController *pssc = NULL;
_ASSERTE(NULL != pthr);
_ASSERTE(NULL != phMutex);
ENTRY("InternalCreateMutex(pthr=%p, lpMutexAttributes=%p, bInitialOwner=%d"
", lpName=%p, phMutex=%p)\n",
pthr,
lpMutexAttributes,
bInitialOwner,
lpName,
phMutex
);
if (lpName != nullptr)
{
ASSERT("lpName: Cross-process named objects are not supported in PAL");
palError = ERROR_NOT_SUPPORTED;
goto InternalCreateMutexExit;
}
palError = g_pObjectManager->AllocateObject(
pthr,
&otMutex,
&oa,
&pobjMutex
);
if (NO_ERROR != palError)
{
goto InternalCreateMutexExit;
}
palError = pobjMutex->GetSynchStateController(
pthr,
&pssc
);
if (NO_ERROR != palError)
{
ASSERT("Unable to create state controller (%d)\n", palError);
goto InternalCreateMutexExit;
}
if (bInitialOwner)
{
palError = pssc->SetOwner(pthr);
}
else
{
palError = pssc->SetSignalCount(1);
}
pssc->ReleaseController();
if (NO_ERROR != palError)
{
ASSERT("Unable to set initial mutex state (%d)\n", palError);
goto InternalCreateMutexExit;
}
palError = g_pObjectManager->RegisterObject(
pthr,
pobjMutex,
&aotMutex,
0, // should be MUTEX_ALL_ACCESS -- currently ignored (no Win32 security)
phMutex,
&pobjRegisteredMutex
);
//
// pobjMutex is invalidated by the call to RegisterObject, so NULL it
// out here to ensure that we don't try to release a reference on
// it down the line.
//
pobjMutex = NULL;
InternalCreateMutexExit:
if (NULL != pobjMutex)
{
pobjMutex->ReleaseReference(pthr);
}
if (NULL != pobjRegisteredMutex)
{
pobjRegisteredMutex->ReleaseReference(pthr);
}
LOGEXIT("InternalCreateMutex returns %i\n", palError);
return palError;
}
