acpi_status
acpi_acquire_global_lock (
u16 timeout,
u32 *handle)
{
acpi_status status;
if (!handle) {
return (AE_BAD_PARAMETER);
}
status = acpi_ex_enter_interpreter ();
if (ACPI_FAILURE (status)) {
return (status);
}
status = acpi_ev_acquire_global_lock (timeout);
acpi_ex_exit_interpreter ();
if (ACPI_SUCCESS (status)) {
acpi_gbl_global_lock_handle++;
*handle = acpi_gbl_global_lock_handle;
}
return (status);
}
acpi_status
acpi_ex_system_acquire_mutex (
union acpi_operand_object *time_desc,
union acpi_operand_object *obj_desc)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE_PTR ("ex_system_acquire_mutex", obj_desc);
if (!obj_desc) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* Support for the _GL_ Mutex object -- go get the global lock
*/
if (obj_desc->mutex.semaphore == acpi_gbl_global_lock_semaphore) {
status = acpi_ev_acquire_global_lock ((u16) time_desc->integer.value);
return_ACPI_STATUS (status);
}
status = acpi_ex_system_wait_semaphore (obj_desc->mutex.semaphore,
(u16) time_desc->integer.value);
return_ACPI_STATUS (status);
}
acpi_status
acpi_ex_acquire_mutex_object(u16 timeout,
union acpi_operand_object *obj_desc,
acpi_thread_id thread_id)
{
acpi_status status;
ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex_object, obj_desc);
if (!obj_desc) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Support for multiple acquires by the owning thread */
if (obj_desc->mutex.thread_id == thread_id) {
/*
* The mutex is already owned by this thread, just increment the
* acquisition depth
*/
obj_desc->mutex.acquisition_depth++;
return_ACPI_STATUS(AE_OK);
}
/* Acquire the mutex, wait if necessary. Special case for Global Lock */
if (obj_desc == acpi_gbl_global_lock_mutex) {
status = acpi_ev_acquire_global_lock(timeout);
} else {
status =
acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
timeout);
}
if (ACPI_FAILURE(status)) {
/* Includes failure from a timeout on time_desc */
return_ACPI_STATUS(status);
}
/* Acquired the mutex: update mutex object */
obj_desc->mutex.thread_id = thread_id;
obj_desc->mutex.acquisition_depth = 1;
obj_desc->mutex.original_sync_level = 0;
obj_desc->mutex.owner_thread = NULL; /* Used only for AML Acquire() */
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_acquire_global_lock
*
* PARAMETERS: Timeout - How long the caller is willing to wait
* Handle - Where the handle to the lock is returned
* (if acquired)
*
* RETURN: Status
*
* DESCRIPTION: Acquire the ACPI Global Lock
*
******************************************************************************/
acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
{
acpi_status status;
if (!handle) {
return (AE_BAD_PARAMETER);
}
/* Must lock interpreter to prevent race conditions */
acpi_ex_enter_interpreter();
status = acpi_ev_acquire_global_lock(timeout);
acpi_ex_exit_interpreter();
if (ACPI_SUCCESS(status)) {
acpi_gbl_global_lock_handle++;
*handle = acpi_gbl_global_lock_handle;
}
return (status);
}
acpi_status
acpi_acquire_global_lock (
void)
{
acpi_status status;
status = acpi_ex_enter_interpreter ();
if (ACPI_FAILURE (status)) {
return (status);
}
/*
* TBD: [Restructure] add timeout param to internal interface, and
* perhaps INTERPRETER_LOCKED
*/
status = acpi_ev_acquire_global_lock ();
acpi_ex_exit_interpreter ();
return (status);
}
acpi_status
acpi_ex_acquire_mutex(union acpi_operand_object *time_desc,
union acpi_operand_object *obj_desc,
struct acpi_walk_state *walk_state)
{
acpi_status status;
ACPI_FUNCTION_TRACE_PTR(ex_acquire_mutex, obj_desc);
if (!obj_desc) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Sanity check: we must have a valid thread ID */
if (!walk_state->thread) {
ACPI_ERROR((AE_INFO,
"Cannot acquire Mutex [%4.4s], null thread info",
acpi_ut_get_node_name(obj_desc->mutex.node)));
return_ACPI_STATUS(AE_AML_INTERNAL);
}
/*
* Current Sync must be less than or equal to the sync level of the
* mutex. This mechanism provides some deadlock prevention
*/
if (walk_state->thread->current_sync_level > obj_desc->mutex.sync_level) {
ACPI_ERROR((AE_INFO,
"Cannot acquire Mutex [%4.4s], current SyncLevel is too large (%d)",
acpi_ut_get_node_name(obj_desc->mutex.node),
walk_state->thread->current_sync_level));
return_ACPI_STATUS(AE_AML_MUTEX_ORDER);
}
/* Support for multiple acquires by the owning thread */
if (obj_desc->mutex.owner_thread_id == acpi_os_get_thread_id()) {
/*
* The mutex is already owned by this thread, just increment the
* acquisition depth
*/
obj_desc->mutex.acquisition_depth++;
return_ACPI_STATUS(AE_OK);
}
/* Acquire the mutex, wait if necessary. Special case for Global Lock */
if (obj_desc->mutex.os_mutex == acpi_gbl_global_lock_mutex) {
status =
acpi_ev_acquire_global_lock((u16) time_desc->integer.value);
} else {
status = acpi_ex_system_wait_mutex(obj_desc->mutex.os_mutex,
(u16) time_desc->integer.
value);
}
if (ACPI_FAILURE(status)) {
/* Includes failure from a timeout on time_desc */
return_ACPI_STATUS(status);
}
/* Have the mutex: update mutex and walk info and save the sync_level */
obj_desc->mutex.owner_thread_id = acpi_os_get_thread_id();
obj_desc->mutex.acquisition_depth = 1;
obj_desc->mutex.original_sync_level =
walk_state->thread->current_sync_level;
walk_state->thread->current_sync_level = obj_desc->mutex.sync_level;
/* Link the mutex to the current thread for force-unlock at method exit */
acpi_ex_link_mutex(obj_desc, walk_state->thread);
return_ACPI_STATUS(AE_OK);
}