/**
* Changes an alias to point to a new address space.
*
* Not all the aliases can be changed, currently it's only DBGF_AS_GLOBAL
* and DBGF_AS_KERNEL.
*
* @returns VBox status code.
* @param pUVM The user mode VM handle.
* @param hAlias The alias to change.
* @param hAliasFor The address space hAlias should be an alias for. This
* can be an alias. The caller's reference to this address
* space will NOT be consumed.
*/
VMMR3DECL(int) DBGFR3AsSetAlias(PUVM pUVM, RTDBGAS hAlias, RTDBGAS hAliasFor)
{
/*
* Input validation.
*/
UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
AssertMsgReturn(DBGF_AS_IS_ALIAS(hAlias), ("%p\n", hAlias), VERR_INVALID_PARAMETER);
AssertMsgReturn(!DBGF_AS_IS_FIXED_ALIAS(hAlias), ("%p\n", hAlias), VERR_INVALID_PARAMETER);
RTDBGAS hRealAliasFor = DBGFR3AsResolveAndRetain(pUVM, hAliasFor);
if (hRealAliasFor == NIL_RTDBGAS)
return VERR_INVALID_HANDLE;
/*
* Make sure the handle has is already in the database.
*/
int rc = VERR_NOT_FOUND;
DBGF_AS_DB_LOCK_WRITE(pUVM);
if (RTAvlPVGet(&pUVM->dbgf.s.AsHandleTree, hRealAliasFor))
{
/*
* Update the alias table and release the current address space.
*/
RTDBGAS hAsOld;
ASMAtomicXchgHandle(&pUVM->dbgf.s.ahAsAliases[DBGF_AS_ALIAS_2_INDEX(hAlias)], hRealAliasFor, &hAsOld);
uint32_t cRefs = RTDbgAsRelease(hAsOld);
Assert(cRefs > 0); Assert(cRefs != UINT32_MAX); NOREF(cRefs);
rc = VINF_SUCCESS;
}
DBGF_AS_DB_UNLOCK_WRITE(pUVM);
return rc;
}
/**
* Gets a block.
*/
DECLINLINE(PRTMEMBLOCK) rtmemBlockGet(void *pv)
{
rtmemBlockLock();
PRTMEMBLOCK pBlock = (PRTMEMBLOCK)RTAvlPVGet(&g_BlocksTree, pv);
rtmemBlockUnlock();
return pBlock;
}
/**
* Gets a thread by it's native ID.
*
* @returns pointer to the thread structure.
* @returns NULL if not a thread IPRT knows.
* @param NativeThread The native thread id.
*/
DECLHIDDEN(PRTTHREADINT) rtThreadGetByNative(RTNATIVETHREAD NativeThread)
{
PRTTHREADINT pThread;
/*
* Simple tree lookup.
*/
RT_THREAD_LOCK_RD();
pThread = (PRTTHREADINT)RTAvlPVGet(&g_ThreadTree, (void *)NativeThread);
RT_THREAD_UNLOCK_RD();
return pThread;
}
/**
* Insert the per thread data structure into the tree.
*
* This can be called from both the thread it self and the parent,
* thus it must handle insertion failures in a nice manner.
*
* @param pThread Pointer to thread structure allocated by rtThreadAlloc().
* @param NativeThread The native thread id.
*/
DECLHIDDEN(void) rtThreadInsert(PRTTHREADINT pThread, RTNATIVETHREAD NativeThread)
{
Assert(pThread);
Assert(pThread->u32Magic == RTTHREADINT_MAGIC);
{
RT_THREAD_LOCK_RW();
/*
* Do not insert a terminated thread.
*
* This may happen if the thread finishes before the RTThreadCreate call
* gets this far. Since the OS may quickly reuse the native thread ID
* it should not be reinserted at this point.
*/
if (rtThreadGetState(pThread) != RTTHREADSTATE_TERMINATED)
{
/*
* Before inserting we must check if there is a thread with this id
* in the tree already. We're racing parent and child on insert here
* so that the handle is valid in both ends when they return / start.
*
* If it's not ourself we find, it's a dead alien thread and we will
* unlink it from the tree. Alien threads will be released at this point.
*/
PRTTHREADINT pThreadOther = (PRTTHREADINT)RTAvlPVGet(&g_ThreadTree, (void *)NativeThread);
if (pThreadOther != pThread)
{
bool fRc;
/* remove dead alien if any */
if (pThreadOther)
{
AssertMsg(pThreadOther->fIntFlags & RTTHREADINT_FLAGS_ALIEN, ("%p:%s; %p:%s\n", pThread, pThread->szName, pThreadOther, pThreadOther->szName));
ASMAtomicBitClear(&pThread->fIntFlags, RTTHREADINT_FLAG_IN_TREE_BIT);
rtThreadRemoveLocked(pThreadOther);
if (pThreadOther->fIntFlags & RTTHREADINT_FLAGS_ALIEN)
rtThreadRelease(pThreadOther);
}
/* insert the thread */
ASMAtomicWritePtr(&pThread->Core.Key, (void *)NativeThread);
fRc = RTAvlPVInsert(&g_ThreadTree, &pThread->Core);
ASMAtomicOrU32(&pThread->fIntFlags, RTTHREADINT_FLAG_IN_TREE);
if (fRc)
ASMAtomicIncU32(&g_cThreadInTree);
AssertReleaseMsg(fRc, ("Lock problem? %p (%RTnthrd) %s\n", pThread, NativeThread, pThread->szName));
NOREF(fRc);
}
}
RT_THREAD_UNLOCK_RW();
}
}
