0,0 → 1,773 |
/****************************************************************************** |
* |
* Module Name: dsmethod - Parser/Interpreter interface - control method parsing |
* |
*****************************************************************************/ |
|
/****************************************************************************** |
* |
* 1. Copyright Notice |
* |
* Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp. |
* All rights reserved. |
* |
* 2. License |
* |
* 2.1. This is your license from Intel Corp. under its intellectual property |
* rights. You may have additional license terms from the party that provided |
* you this software, covering your right to use that party's intellectual |
* property rights. |
* |
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a |
* copy of the source code appearing in this file ("Covered Code") an |
* irrevocable, perpetual, worldwide license under Intel's copyrights in the |
* base code distributed originally by Intel ("Original Intel Code") to copy, |
* make derivatives, distribute, use and display any portion of the Covered |
* Code in any form, with the right to sublicense such rights; and |
* |
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent |
* license (with the right to sublicense), under only those claims of Intel |
* patents that are infringed by the Original Intel Code, to make, use, sell, |
* offer to sell, and import the Covered Code and derivative works thereof |
* solely to the minimum extent necessary to exercise the above copyright |
* license, and in no event shall the patent license extend to any additions |
* to or modifications of the Original Intel Code. No other license or right |
* is granted directly or by implication, estoppel or otherwise; |
* |
* The above copyright and patent license is granted only if the following |
* conditions are met: |
* |
* 3. Conditions |
* |
* 3.1. Redistribution of Source with Rights to Further Distribute Source. |
* Redistribution of source code of any substantial portion of the Covered |
* Code or modification with rights to further distribute source must include |
* the above Copyright Notice, the above License, this list of Conditions, |
* and the following Disclaimer and Export Compliance provision. In addition, |
* Licensee must cause all Covered Code to which Licensee contributes to |
* contain a file documenting the changes Licensee made to create that Covered |
* Code and the date of any change. Licensee must include in that file the |
* documentation of any changes made by any predecessor Licensee. Licensee |
* must include a prominent statement that the modification is derived, |
* directly or indirectly, from Original Intel Code. |
* |
* 3.2. Redistribution of Source with no Rights to Further Distribute Source. |
* Redistribution of source code of any substantial portion of the Covered |
* Code or modification without rights to further distribute source must |
* include the following Disclaimer and Export Compliance provision in the |
* documentation and/or other materials provided with distribution. In |
* addition, Licensee may not authorize further sublicense of source of any |
* portion of the Covered Code, and must include terms to the effect that the |
* license from Licensee to its licensee is limited to the intellectual |
* property embodied in the software Licensee provides to its licensee, and |
* not to intellectual property embodied in modifications its licensee may |
* make. |
* |
* 3.3. Redistribution of Executable. Redistribution in executable form of any |
* substantial portion of the Covered Code or modification must reproduce the |
* above Copyright Notice, and the following Disclaimer and Export Compliance |
* provision in the documentation and/or other materials provided with the |
* distribution. |
* |
* 3.4. Intel retains all right, title, and interest in and to the Original |
* Intel Code. |
* |
* 3.5. Neither the name Intel nor any other trademark owned or controlled by |
* Intel shall be used in advertising or otherwise to promote the sale, use or |
* other dealings in products derived from or relating to the Covered Code |
* without prior written authorization from Intel. |
* |
* 4. Disclaimer and Export Compliance |
* |
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED |
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE |
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, |
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY |
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY |
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A |
* PARTICULAR PURPOSE. |
* |
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES |
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR |
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, |
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY |
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL |
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS |
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY |
* LIMITED REMEDY. |
* |
* 4.3. Licensee shall not export, either directly or indirectly, any of this |
* software or system incorporating such software without first obtaining any |
* required license or other approval from the U. S. Department of Commerce or |
* any other agency or department of the United States Government. In the |
* event Licensee exports any such software from the United States or |
* re-exports any such software from a foreign destination, Licensee shall |
* ensure that the distribution and export/re-export of the software is in |
* compliance with all laws, regulations, orders, or other restrictions of the |
* U.S. Export Administration Regulations. Licensee agrees that neither it nor |
* any of its subsidiaries will export/re-export any technical data, process, |
* software, or service, directly or indirectly, to any country for which the |
* United States government or any agency thereof requires an export license, |
* other governmental approval, or letter of assurance, without first obtaining |
* such license, approval or letter. |
* |
*****************************************************************************/ |
|
#define __DSMETHOD_C__ |
|
#include "acpi.h" |
#include "accommon.h" |
#include "amlcode.h" |
#include "acdispat.h" |
#include "acinterp.h" |
#include "acnamesp.h" |
#include "acdisasm.h" |
|
|
#define _COMPONENT ACPI_DISPATCHER |
ACPI_MODULE_NAME ("dsmethod") |
|
/* Local prototypes */ |
|
static ACPI_STATUS |
AcpiDsCreateMethodMutex ( |
ACPI_OPERAND_OBJECT *MethodDesc); |
|
|
/******************************************************************************* |
* |
* FUNCTION: AcpiDsMethodError |
* |
* PARAMETERS: Status - Execution status |
* WalkState - Current state |
* |
* RETURN: Status |
* |
* DESCRIPTION: Called on method error. Invoke the global exception handler if |
* present, dump the method data if the disassembler is configured |
* |
* Note: Allows the exception handler to change the status code |
* |
******************************************************************************/ |
|
ACPI_STATUS |
AcpiDsMethodError ( |
ACPI_STATUS Status, |
ACPI_WALK_STATE *WalkState) |
{ |
ACPI_FUNCTION_ENTRY (); |
|
|
/* Ignore AE_OK and control exception codes */ |
|
if (ACPI_SUCCESS (Status) || |
(Status & AE_CODE_CONTROL)) |
{ |
return (Status); |
} |
|
/* Invoke the global exception handler */ |
|
if (AcpiGbl_ExceptionHandler) |
{ |
/* Exit the interpreter, allow handler to execute methods */ |
|
AcpiExExitInterpreter (); |
|
/* |
* Handler can map the exception code to anything it wants, including |
* AE_OK, in which case the executing method will not be aborted. |
*/ |
Status = AcpiGbl_ExceptionHandler (Status, |
WalkState->MethodNode ? |
WalkState->MethodNode->Name.Integer : 0, |
WalkState->Opcode, WalkState->AmlOffset, NULL); |
AcpiExEnterInterpreter (); |
} |
|
AcpiDsClearImplicitReturn (WalkState); |
|
#ifdef ACPI_DISASSEMBLER |
if (ACPI_FAILURE (Status)) |
{ |
/* Display method locals/args if disassembler is present */ |
|
AcpiDmDumpMethodInfo (Status, WalkState, WalkState->Op); |
} |
#endif |
|
return (Status); |
} |
|
|
/******************************************************************************* |
* |
* FUNCTION: AcpiDsCreateMethodMutex |
* |
* PARAMETERS: ObjDesc - The method object |
* |
* RETURN: Status |
* |
* DESCRIPTION: Create a mutex object for a serialized control method |
* |
******************************************************************************/ |
|
static ACPI_STATUS |
AcpiDsCreateMethodMutex ( |
ACPI_OPERAND_OBJECT *MethodDesc) |
{ |
ACPI_OPERAND_OBJECT *MutexDesc; |
ACPI_STATUS Status; |
|
|
ACPI_FUNCTION_TRACE (DsCreateMethodMutex); |
|
|
/* Create the new mutex object */ |
|
MutexDesc = AcpiUtCreateInternalObject (ACPI_TYPE_MUTEX); |
if (!MutexDesc) |
{ |
return_ACPI_STATUS (AE_NO_MEMORY); |
} |
|
/* Create the actual OS Mutex */ |
|
Status = AcpiOsCreateMutex (&MutexDesc->Mutex.OsMutex); |
if (ACPI_FAILURE (Status)) |
{ |
return_ACPI_STATUS (Status); |
} |
|
MutexDesc->Mutex.SyncLevel = MethodDesc->Method.SyncLevel; |
MethodDesc->Method.Mutex = MutexDesc; |
return_ACPI_STATUS (AE_OK); |
} |
|
|
/******************************************************************************* |
* |
* FUNCTION: AcpiDsBeginMethodExecution |
* |
* PARAMETERS: MethodNode - Node of the method |
* ObjDesc - The method object |
* WalkState - current state, NULL if not yet executing |
* a method. |
* |
* RETURN: Status |
* |
* DESCRIPTION: Prepare a method for execution. Parses the method if necessary, |
* increments the thread count, and waits at the method semaphore |
* for clearance to execute. |
* |
******************************************************************************/ |
|
ACPI_STATUS |
AcpiDsBeginMethodExecution ( |
ACPI_NAMESPACE_NODE *MethodNode, |
ACPI_OPERAND_OBJECT *ObjDesc, |
ACPI_WALK_STATE *WalkState) |
{ |
ACPI_STATUS Status = AE_OK; |
|
|
ACPI_FUNCTION_TRACE_PTR (DsBeginMethodExecution, MethodNode); |
|
|
if (!MethodNode) |
{ |
return_ACPI_STATUS (AE_NULL_ENTRY); |
} |
|
/* Prevent wraparound of thread count */ |
|
if (ObjDesc->Method.ThreadCount == ACPI_UINT8_MAX) |
{ |
ACPI_ERROR ((AE_INFO, |
"Method reached maximum reentrancy limit (255)")); |
return_ACPI_STATUS (AE_AML_METHOD_LIMIT); |
} |
|
/* |
* If this method is serialized, we need to acquire the method mutex. |
*/ |
if (ObjDesc->Method.MethodFlags & AML_METHOD_SERIALIZED) |
{ |
/* |
* Create a mutex for the method if it is defined to be Serialized |
* and a mutex has not already been created. We defer the mutex creation |
* until a method is actually executed, to minimize the object count |
*/ |
if (!ObjDesc->Method.Mutex) |
{ |
Status = AcpiDsCreateMethodMutex (ObjDesc); |
if (ACPI_FAILURE (Status)) |
{ |
return_ACPI_STATUS (Status); |
} |
} |
|
/* |
* The CurrentSyncLevel (per-thread) must be less than or equal to |
* the sync level of the method. This mechanism provides some |
* deadlock prevention |
* |
* Top-level method invocation has no walk state at this point |
*/ |
if (WalkState && |
(WalkState->Thread->CurrentSyncLevel > ObjDesc->Method.Mutex->Mutex.SyncLevel)) |
{ |
ACPI_ERROR ((AE_INFO, |
"Cannot acquire Mutex for method [%4.4s], current SyncLevel is too large (%u)", |
AcpiUtGetNodeName (MethodNode), |
WalkState->Thread->CurrentSyncLevel)); |
|
return_ACPI_STATUS (AE_AML_MUTEX_ORDER); |
} |
|
/* |
* Obtain the method mutex if necessary. Do not acquire mutex for a |
* recursive call. |
*/ |
if (!WalkState || |
!ObjDesc->Method.Mutex->Mutex.ThreadId || |
(WalkState->Thread->ThreadId != ObjDesc->Method.Mutex->Mutex.ThreadId)) |
{ |
/* |
* Acquire the method mutex. This releases the interpreter if we |
* block (and reacquires it before it returns) |
*/ |
Status = AcpiExSystemWaitMutex (ObjDesc->Method.Mutex->Mutex.OsMutex, |
ACPI_WAIT_FOREVER); |
if (ACPI_FAILURE (Status)) |
{ |
return_ACPI_STATUS (Status); |
} |
|
/* Update the mutex and walk info and save the original SyncLevel */ |
|
if (WalkState) |
{ |
ObjDesc->Method.Mutex->Mutex.OriginalSyncLevel = |
WalkState->Thread->CurrentSyncLevel; |
|
ObjDesc->Method.Mutex->Mutex.ThreadId = WalkState->Thread->ThreadId; |
WalkState->Thread->CurrentSyncLevel = ObjDesc->Method.SyncLevel; |
} |
else |
{ |
ObjDesc->Method.Mutex->Mutex.OriginalSyncLevel = |
ObjDesc->Method.Mutex->Mutex.SyncLevel; |
} |
} |
|
/* Always increase acquisition depth */ |
|
ObjDesc->Method.Mutex->Mutex.AcquisitionDepth++; |
} |
|
/* |
* Allocate an Owner ID for this method, only if this is the first thread |
* to begin concurrent execution. We only need one OwnerId, even if the |
* method is invoked recursively. |
*/ |
if (!ObjDesc->Method.OwnerId) |
{ |
Status = AcpiUtAllocateOwnerId (&ObjDesc->Method.OwnerId); |
if (ACPI_FAILURE (Status)) |
{ |
goto Cleanup; |
} |
} |
|
/* |
* Increment the method parse tree thread count since it has been |
* reentered one more time (even if it is the same thread) |
*/ |
ObjDesc->Method.ThreadCount++; |
AcpiMethodCount++; |
return_ACPI_STATUS (Status); |
|
|
Cleanup: |
/* On error, must release the method mutex (if present) */ |
|
if (ObjDesc->Method.Mutex) |
{ |
AcpiOsReleaseMutex (ObjDesc->Method.Mutex->Mutex.OsMutex); |
} |
return_ACPI_STATUS (Status); |
} |
|
|
/******************************************************************************* |
* |
* FUNCTION: AcpiDsCallControlMethod |
* |
* PARAMETERS: Thread - Info for this thread |
* ThisWalkState - Current walk state |
* Op - Current Op to be walked |
* |
* RETURN: Status |
* |
* DESCRIPTION: Transfer execution to a called control method |
* |
******************************************************************************/ |
|
ACPI_STATUS |
AcpiDsCallControlMethod ( |
ACPI_THREAD_STATE *Thread, |
ACPI_WALK_STATE *ThisWalkState, |
ACPI_PARSE_OBJECT *Op) |
{ |
ACPI_STATUS Status; |
ACPI_NAMESPACE_NODE *MethodNode; |
ACPI_WALK_STATE *NextWalkState = NULL; |
ACPI_OPERAND_OBJECT *ObjDesc; |
ACPI_EVALUATE_INFO *Info; |
UINT32 i; |
|
|
ACPI_FUNCTION_TRACE_PTR (DsCallControlMethod, ThisWalkState); |
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, "Calling method %p, currentstate=%p\n", |
ThisWalkState->PrevOp, ThisWalkState)); |
|
/* |
* Get the namespace entry for the control method we are about to call |
*/ |
MethodNode = ThisWalkState->MethodCallNode; |
if (!MethodNode) |
{ |
return_ACPI_STATUS (AE_NULL_ENTRY); |
} |
|
ObjDesc = AcpiNsGetAttachedObject (MethodNode); |
if (!ObjDesc) |
{ |
return_ACPI_STATUS (AE_NULL_OBJECT); |
} |
|
/* Init for new method, possibly wait on method mutex */ |
|
Status = AcpiDsBeginMethodExecution (MethodNode, ObjDesc, |
ThisWalkState); |
if (ACPI_FAILURE (Status)) |
{ |
return_ACPI_STATUS (Status); |
} |
|
/* Begin method parse/execution. Create a new walk state */ |
|
NextWalkState = AcpiDsCreateWalkState (ObjDesc->Method.OwnerId, |
NULL, ObjDesc, Thread); |
if (!NextWalkState) |
{ |
Status = AE_NO_MEMORY; |
goto Cleanup; |
} |
|
/* |
* The resolved arguments were put on the previous walk state's operand |
* stack. Operands on the previous walk state stack always |
* start at index 0. Also, null terminate the list of arguments |
*/ |
ThisWalkState->Operands [ThisWalkState->NumOperands] = NULL; |
|
/* |
* Allocate and initialize the evaluation information block |
* TBD: this is somewhat inefficient, should change interface to |
* DsInitAmlWalk. For now, keeps this struct off the CPU stack |
*/ |
Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); |
if (!Info) |
{ |
return_ACPI_STATUS (AE_NO_MEMORY); |
} |
|
Info->Parameters = &ThisWalkState->Operands[0]; |
|
Status = AcpiDsInitAmlWalk (NextWalkState, NULL, MethodNode, |
ObjDesc->Method.AmlStart, ObjDesc->Method.AmlLength, |
Info, ACPI_IMODE_EXECUTE); |
|
ACPI_FREE (Info); |
if (ACPI_FAILURE (Status)) |
{ |
goto Cleanup; |
} |
|
/* |
* Delete the operands on the previous walkstate operand stack |
* (they were copied to new objects) |
*/ |
for (i = 0; i < ObjDesc->Method.ParamCount; i++) |
{ |
AcpiUtRemoveReference (ThisWalkState->Operands [i]); |
ThisWalkState->Operands [i] = NULL; |
} |
|
/* Clear the operand stack */ |
|
ThisWalkState->NumOperands = 0; |
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, |
"**** Begin nested execution of [%4.4s] **** WalkState=%p\n", |
MethodNode->Name.Ascii, NextWalkState)); |
|
/* Invoke an internal method if necessary */ |
|
if (ObjDesc->Method.MethodFlags & AML_METHOD_INTERNAL_ONLY) |
{ |
Status = ObjDesc->Method.Extra.Implementation (NextWalkState); |
if (Status == AE_OK) |
{ |
Status = AE_CTRL_TERMINATE; |
} |
} |
|
return_ACPI_STATUS (Status); |
|
|
Cleanup: |
|
/* On error, we must terminate the method properly */ |
|
AcpiDsTerminateControlMethod (ObjDesc, NextWalkState); |
if (NextWalkState) |
{ |
AcpiDsDeleteWalkState (NextWalkState); |
} |
|
return_ACPI_STATUS (Status); |
} |
|
|
/******************************************************************************* |
* |
* FUNCTION: AcpiDsRestartControlMethod |
* |
* PARAMETERS: WalkState - State for preempted method (caller) |
* ReturnDesc - Return value from the called method |
* |
* RETURN: Status |
* |
* DESCRIPTION: Restart a method that was preempted by another (nested) method |
* invocation. Handle the return value (if any) from the callee. |
* |
******************************************************************************/ |
|
ACPI_STATUS |
AcpiDsRestartControlMethod ( |
ACPI_WALK_STATE *WalkState, |
ACPI_OPERAND_OBJECT *ReturnDesc) |
{ |
ACPI_STATUS Status; |
int SameAsImplicitReturn; |
|
|
ACPI_FUNCTION_TRACE_PTR (DsRestartControlMethod, WalkState); |
|
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, |
"****Restart [%4.4s] Op %p ReturnValueFromCallee %p\n", |
AcpiUtGetNodeName (WalkState->MethodNode), |
WalkState->MethodCallOp, ReturnDesc)); |
|
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, |
" ReturnFromThisMethodUsed?=%X ResStack %p Walk %p\n", |
WalkState->ReturnUsed, |
WalkState->Results, WalkState)); |
|
/* Did the called method return a value? */ |
|
if (ReturnDesc) |
{ |
/* Is the implicit return object the same as the return desc? */ |
|
SameAsImplicitReturn = (WalkState->ImplicitReturnObj == ReturnDesc); |
|
/* Are we actually going to use the return value? */ |
|
if (WalkState->ReturnUsed) |
{ |
/* Save the return value from the previous method */ |
|
Status = AcpiDsResultPush (ReturnDesc, WalkState); |
if (ACPI_FAILURE (Status)) |
{ |
AcpiUtRemoveReference (ReturnDesc); |
return_ACPI_STATUS (Status); |
} |
|
/* |
* Save as THIS method's return value in case it is returned |
* immediately to yet another method |
*/ |
WalkState->ReturnDesc = ReturnDesc; |
} |
|
/* |
* The following code is the optional support for the so-called |
* "implicit return". Some AML code assumes that the last value of the |
* method is "implicitly" returned to the caller, in the absence of an |
* explicit return value. |
* |
* Just save the last result of the method as the return value. |
* |
* NOTE: this is optional because the ASL language does not actually |
* support this behavior. |
*/ |
else if (!AcpiDsDoImplicitReturn (ReturnDesc, WalkState, FALSE) || |
SameAsImplicitReturn) |
{ |
/* |
* Delete the return value if it will not be used by the |
* calling method or remove one reference if the explicit return |
* is the same as the implicit return value. |
*/ |
AcpiUtRemoveReference (ReturnDesc); |
} |
} |
|
return_ACPI_STATUS (AE_OK); |
} |
|
|
/******************************************************************************* |
* |
* FUNCTION: AcpiDsTerminateControlMethod |
* |
* PARAMETERS: MethodDesc - Method object |
* WalkState - State associated with the method |
* |
* RETURN: None |
* |
* DESCRIPTION: Terminate a control method. Delete everything that the method |
* created, delete all locals and arguments, and delete the parse |
* tree if requested. |
* |
* MUTEX: Interpreter is locked |
* |
******************************************************************************/ |
|
void |
AcpiDsTerminateControlMethod ( |
ACPI_OPERAND_OBJECT *MethodDesc, |
ACPI_WALK_STATE *WalkState) |
{ |
|
ACPI_FUNCTION_TRACE_PTR (DsTerminateControlMethod, WalkState); |
|
|
/* MethodDesc is required, WalkState is optional */ |
|
if (!MethodDesc) |
{ |
return_VOID; |
} |
|
if (WalkState) |
{ |
/* Delete all arguments and locals */ |
|
AcpiDsMethodDataDeleteAll (WalkState); |
|
/* |
* If method is serialized, release the mutex and restore the |
* current sync level for this thread |
*/ |
if (MethodDesc->Method.Mutex) |
{ |
/* Acquisition Depth handles recursive calls */ |
|
MethodDesc->Method.Mutex->Mutex.AcquisitionDepth--; |
if (!MethodDesc->Method.Mutex->Mutex.AcquisitionDepth) |
{ |
WalkState->Thread->CurrentSyncLevel = |
MethodDesc->Method.Mutex->Mutex.OriginalSyncLevel; |
|
AcpiOsReleaseMutex (MethodDesc->Method.Mutex->Mutex.OsMutex); |
MethodDesc->Method.Mutex->Mutex.ThreadId = 0; |
} |
} |
|
/* |
* Delete any namespace objects created anywhere within the |
* namespace by the execution of this method. Unless this method |
* is a module-level executable code method, in which case we |
* want make the objects permanent. |
*/ |
if (!(MethodDesc->Method.Flags & AOPOBJ_MODULE_LEVEL)) |
{ |
/* Delete any direct children of (created by) this method */ |
|
AcpiNsDeleteNamespaceSubtree (WalkState->MethodNode); |
|
/* |
* Delete any objects that were created by this method |
* elsewhere in the namespace (if any were created). |
*/ |
if (MethodDesc->Method.Flags & AOPOBJ_MODIFIED_NAMESPACE) |
{ |
AcpiNsDeleteNamespaceByOwner (MethodDesc->Method.OwnerId); |
} |
} |
} |
|
/* Decrement the thread count on the method */ |
|
if (MethodDesc->Method.ThreadCount) |
{ |
MethodDesc->Method.ThreadCount--; |
} |
else |
{ |
ACPI_ERROR ((AE_INFO, |
"Invalid zero thread count in method")); |
} |
|
/* Are there any other threads currently executing this method? */ |
|
if (MethodDesc->Method.ThreadCount) |
{ |
/* |
* Additional threads. Do not release the OwnerId in this case, |
* we immediately reuse it for the next thread executing this method |
*/ |
ACPI_DEBUG_PRINT ((ACPI_DB_DISPATCH, |
"*** Completed execution of one thread, %u threads remaining\n", |
MethodDesc->Method.ThreadCount)); |
} |
else |
{ |
/* This is the only executing thread for this method */ |
|
/* |
* Support to dynamically change a method from NotSerialized to |
* Serialized if it appears that the method is incorrectly written and |
* does not support multiple thread execution. The best example of this |
* is if such a method creates namespace objects and blocks. A second |
* thread will fail with an AE_ALREADY_EXISTS exception |
* |
* This code is here because we must wait until the last thread exits |
* before creating the synchronization semaphore. |
*/ |
if ((MethodDesc->Method.MethodFlags & AML_METHOD_SERIALIZED) && |
(!MethodDesc->Method.Mutex)) |
{ |
(void) AcpiDsCreateMethodMutex (MethodDesc); |
} |
|
/* No more threads, we can free the OwnerId */ |
|
if (!(MethodDesc->Method.Flags & AOPOBJ_MODULE_LEVEL)) |
{ |
AcpiUtReleaseOwnerId (&MethodDesc->Method.OwnerId); |
} |
} |
|
return_VOID; |
} |
|
|