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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*++
Module Name:
tls.cpp
Abstract:
Implementation of Thread local storage functions.
--*/
#include "pal/thread.hpp"
#include "procprivate.hpp"
#include <pthread.h>
#include "pal/dbgmsg.h"
#include "pal/misc.h"
#include "pal/virtual.h"
#include "pal/process.h"
#include "pal/init.h"
#include "pal/malloc.hpp"
#include "pal_endian.h"
#include <stddef.h>
using namespace CorUnix;
SET_DEFAULT_DEBUG_CHANNEL(THREAD);
// In safemath.h, Template SafeInt uses macro _ASSERTE, which need to use variable
// defdbgchan defined by SET_DEFAULT_DEBUG_CHANNEL. Therefore, the include statement
// should be placed after the SET_DEFAULT_DEBUG_CHANNEL(THREAD)
#include <safemath.h>
/* This tracks the slots that are used for TlsAlloc. Its size in bits
must be the same as TLS_SLOT_SIZE in pal/thread.h. Since this is
static, it is initialized to 0, which is what we want. */
static unsigned __int64 sTlsSlotFields;
/*++
Function:
TlsAlloc
See MSDN doc.
--*/
DWORD
PALAPI
TlsAlloc(
VOID)
{
DWORD dwIndex;
unsigned int i;
PERF_ENTRY(TlsAlloc);
ENTRY("TlsAlloc()\n");
/* Yes, this could be ever so slightly improved. It's not
likely to be called enough to matter, though, so we won't
optimize here until or unless we need to. */
PROCProcessLock();
for(i = 0; i < sizeof(sTlsSlotFields) * 8; i++)
{
if ((sTlsSlotFields & ((unsigned __int64) 1 << i)) == 0)
{
sTlsSlotFields |= ((unsigned __int64) 1 << i);
break;
}
}
if (i == sizeof(sTlsSlotFields) * 8)
{
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
dwIndex = TLS_OUT_OF_INDEXES;
}
else
{
dwIndex = i;
}
PROCProcessUnlock();
LOGEXIT("TlsAlloc returns DWORD %u\n", dwIndex);
PERF_EXIT(TlsAlloc);
return dwIndex;
}
/*++
Function:
TlsGetValue
See MSDN doc.
--*/
LPVOID
PALAPI
TlsGetValue(
IN DWORD dwTlsIndex)
{
CPalThread *pThread;
PERF_ENTRY(TlsGetValue);
ENTRY("TlsGetValue()\n");
if (dwTlsIndex == (DWORD) -1 || dwTlsIndex >= TLS_SLOT_SIZE)
{
SetLastError(ERROR_INVALID_PARAMETER);
return 0;
}
pThread = InternalGetCurrentThread();
/* From MSDN : "The TlsGetValue function calls SetLastError to clear a
thread's last error when it succeeds." */
pThread->SetLastError(NO_ERROR);
LOGEXIT("TlsGetValue \n" );
PERF_EXIT(TlsGetValue);
return pThread->tlsInfo.tlsSlots[dwTlsIndex];
}
/*++
Function:
TlsSetValue
See MSDN doc.
--*/
BOOL
PALAPI
TlsSetValue(
IN DWORD dwTlsIndex,
IN LPVOID lpTlsValue)
{
CPalThread *pThread;
BOOL bRet = FALSE;
PERF_ENTRY(TlsSetValue);
ENTRY("TlsSetValue(dwTlsIndex=%u, lpTlsValue=%p)\n", dwTlsIndex, lpTlsValue);
if (dwTlsIndex == (DWORD) -1 || dwTlsIndex >= TLS_SLOT_SIZE)
{
SetLastError(ERROR_INVALID_PARAMETER);
goto EXIT;
}
pThread = InternalGetCurrentThread();
pThread->tlsInfo.tlsSlots[dwTlsIndex] = lpTlsValue;
bRet = TRUE;
EXIT:
LOGEXIT("TlsSetValue returns BOOL %d\n", bRet);
PERF_EXIT(TlsSetValue);
return bRet;
}
/*++
Function:
TlsFree
See MSDN doc.
--*/
BOOL
PALAPI
TlsFree(
IN DWORD dwTlsIndex)
{
CPalThread *pThread;
PERF_ENTRY(TlsFree);
ENTRY("TlsFree(dwTlsIndex=%u)\n", dwTlsIndex);
if (dwTlsIndex == (DWORD) -1 || dwTlsIndex >= TLS_SLOT_SIZE)
{
SetLastError(ERROR_INVALID_PARAMETER);
LOGEXIT("TlsFree returns BOOL FALSE\n");
PERF_EXIT(TlsFree);
return FALSE;
}
PROCProcessLock();
/* Reset all threads' values to zero for this index. */
for(pThread = pGThreadList;
pThread != NULL; pThread = pThread->GetNext())
{
pThread->tlsInfo.tlsSlots[dwTlsIndex] = 0;
}
sTlsSlotFields &= ~((unsigned __int64) 1 << dwTlsIndex);
PROCProcessUnlock();
LOGEXIT("TlsFree returns BOOL TRUE\n");
PERF_EXIT(TlsFree);
return TRUE;
}
PAL_ERROR
CThreadTLSInfo::InitializePostCreate(
CPalThread *pThread,
SIZE_T threadId,
DWORD dwLwpId
)
{
PAL_ERROR palError = NO_ERROR;
if (pthread_setspecific(thObjKey, reinterpret_cast<void*>(pThread)))
{
ASSERT("Unable to set the thread object key's value\n");
palError = ERROR_INTERNAL_ERROR;
}
return palError;
}
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