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Diffstat (limited to 'cpukit/score/src/coremutex.c')
-rw-r--r-- | cpukit/score/src/coremutex.c | 269 |
1 files changed, 0 insertions, 269 deletions
diff --git a/cpukit/score/src/coremutex.c b/cpukit/score/src/coremutex.c deleted file mode 100644 index a0c3fd0264..0000000000 --- a/cpukit/score/src/coremutex.c +++ /dev/null @@ -1,269 +0,0 @@ -/* - * Mutex Handler - * - * DESCRIPTION: - * - * This package is the implementation of the Mutex Handler. - * This handler provides synchronization and mutual exclusion capabilities. - * - * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. - * On-Line Applications Research Corporation (OAR). - * All rights assigned to U.S. Government, 1994. - * - * This material may be reproduced by or for the U.S. Government pursuant - * to the copyright license under the clause at DFARS 252.227-7013. This - * notice must appear in all copies of this file and its derivatives. - * - * $Id$ - */ - -#include <rtems/system.h> -#include <rtems/score/isr.h> -#include <rtems/score/coremutex.h> -#include <rtems/score/states.h> -#include <rtems/score/thread.h> -#include <rtems/score/threadq.h> - -/*PAGE - * - * _CORE_mutex_Initialize - * - * This routine initializes a mutex at create time and set the control - * structure according to the values passed. - * - * Input parameters: - * the_mutex - the mutex control block to initialize - * the_class - the API class of the object - * the_mutex_attributes - the mutex attributes specified at create time - * initial_lock - mutex initial lock or unlocked status - * proxy_extract_callout - MP specific extract callout - * - * Output parameters: NONE - */ - -void _CORE_mutex_Initialize( - CORE_mutex_Control *the_mutex, - Objects_Classes the_class, - CORE_mutex_Attributes *the_mutex_attributes, - unsigned32 initial_lock, - Thread_queue_Extract_callout proxy_extract_callout -) -{ - -/* Add this to the RTEMS environment later ????????? - rtems_assert( initial_lock == CORE_MUTEX_LOCKED || - initial_lock == CORE_MUTEX_UNLOCKED ); - */ - - the_mutex->Attributes = *the_mutex_attributes; - the_mutex->lock = initial_lock; - - if ( initial_lock == CORE_MUTEX_LOCKED ) { - the_mutex->nest_count = 1; - the_mutex->holder = _Thread_Executing; - the_mutex->holder_id = _Thread_Executing->Object.id; - _Thread_Executing->resource_count++; - } else { - the_mutex->nest_count = 0; - the_mutex->holder = NULL; - the_mutex->holder_id = 0; - } - - _Thread_queue_Initialize( - &the_mutex->Wait_queue, - the_class, - _CORE_mutex_Is_priority( the_mutex_attributes ) ? - THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO, - STATES_WAITING_FOR_MUTEX, - proxy_extract_callout, - CORE_MUTEX_TIMEOUT - ); -} - -/*PAGE - * - * _CORE_mutex_Seize - * - * This routine attempts to allocate a mutex to the calling thread. - * - * Input parameters: - * the_mutex - pointer to mutex control block - * id - id of object to wait on - * wait - TRUE if wait is allowed, FALSE otherwise - * timeout - number of ticks to wait (0 means forever) - * - * Output parameters: NONE - * - * INTERRUPT LATENCY: - * available - * wait - */ - -void _CORE_mutex_Seize( - CORE_mutex_Control *the_mutex, - Objects_Id id, - boolean wait, - Watchdog_Interval timeout -) -{ - Thread_Control *executing; - ISR_Level level; - - executing = _Thread_Executing; - executing->Wait.return_code = CORE_MUTEX_STATUS_SUCCESSFUL; - _ISR_Disable( level ); - if ( ! _CORE_mutex_Is_locked( the_mutex ) ) { - the_mutex->lock = CORE_MUTEX_LOCKED; - the_mutex->holder = executing; - the_mutex->holder_id = executing->Object.id; - the_mutex->nest_count = 1; - executing->resource_count++; - _ISR_Enable( level ); - return; - } - - if ( _Objects_Are_ids_equal( - _Thread_Executing->Object.id, the_mutex->holder_id ) ) { - if ( _CORE_mutex_Is_nesting_allowed( &the_mutex->Attributes ) ) - the_mutex->nest_count++; - else - executing->Wait.return_code = CORE_MUTEX_STATUS_NESTING_NOT_ALLOWED; - - _ISR_Enable( level ); - return; - } - - if ( !wait ) { - _ISR_Enable( level ); - executing->Wait.return_code = CORE_MUTEX_STATUS_UNSATISFIED_NOWAIT; - return; - } - - _Thread_queue_Enter_critical_section( &the_mutex->Wait_queue ); - executing->Wait.queue = &the_mutex->Wait_queue; - executing->Wait.id = id; - _ISR_Enable( level ); - - if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) && - the_mutex->holder->current_priority > - _Thread_Executing->current_priority ) { - _Thread_Change_priority( - the_mutex->holder, _Thread_Executing->current_priority ); - } - - _Thread_queue_Enqueue( &the_mutex->Wait_queue, timeout ); -} - -/* - * _CORE_mutex_Surrender - * - * DESCRIPTION: - * - * This routine frees a unit to the mutex. If a task was blocked waiting for - * a unit from this mutex, then that task will be readied and the unit - * given to that task. Otherwise, the unit will be returned to the mutex. - * - * Input parameters: - * the_mutex - the mutex to be flushed - * id - id of parent mutex - * api_mutex_mp_support - api dependent MP support actions - * - * Output parameters: - * CORE_MUTEX_STATUS_SUCCESSFUL - if successful - * core error code - if unsuccessful - */ - -CORE_mutex_Status _CORE_mutex_Surrender( - CORE_mutex_Control *the_mutex, - Objects_Id id, - CORE_mutex_API_mp_support_callout api_mutex_mp_support -) -{ - Thread_Control *the_thread; - - if ( !_Objects_Are_ids_equal( - _Thread_Executing->Object.id, the_mutex->holder_id ) ) - return( CORE_MUTEX_STATUS_NOT_OWNER_OF_RESOURCE ); - - the_mutex->nest_count--; - - if ( the_mutex->nest_count != 0 ) - return( CORE_MUTEX_STATUS_SUCCESSFUL ); - - _Thread_Executing->resource_count--; - the_mutex->holder = NULL; - the_mutex->holder_id = 0; - - /* - * Whether or not someone is waiting for the mutex, an - * inherited priority must be lowered if this is the last - * mutex (i.e. resource) this task has. - */ - - if ( _CORE_mutex_Is_inherit_priority( &the_mutex->Attributes ) && - _Thread_Executing->resource_count == 0 && - _Thread_Executing->real_priority != - _Thread_Executing->current_priority ) { - _Thread_Change_priority( - _Thread_Executing, - _Thread_Executing->real_priority - ); - } - - if ( ( the_thread = _Thread_queue_Dequeue( &the_mutex->Wait_queue ) ) ) { - - if ( !_Objects_Is_local_id( the_thread->Object.id ) ) { - - the_mutex->holder = NULL; - the_mutex->holder_id = the_thread->Object.id; - the_mutex->nest_count = 1; - - ( *api_mutex_mp_support)( the_thread, id ); - - } else { - - the_mutex->holder = the_thread; - the_mutex->holder_id = the_thread->Object.id; - the_thread->resource_count++; - the_mutex->nest_count = 1; - - /* - * No special action for priority inheritance because the_thread - * is guaranteed to be the highest priority thread waiting for - * the mutex. - */ - } - } else - the_mutex->lock = CORE_MUTEX_UNLOCKED; - - return( CORE_MUTEX_STATUS_SUCCESSFUL ); -} - -/*PAGE - * - * _CORE_mutex_Flush - * - * This function a flushes the mutex's task wait queue. - * - * Input parameters: - * the_mutex - the mutex to be flushed - * remote_extract_callout - function to invoke remotely - * status - status to pass to thread - * - * Output parameters: NONE - */ - -void _CORE_mutex_Flush( - CORE_mutex_Control *the_mutex, - Thread_queue_Flush_callout remote_extract_callout, - unsigned32 status -) -{ - - _Thread_queue_Flush( - &the_mutex->Wait_queue, - remote_extract_callout, - status - ); - -} |