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Diffstat (limited to 'cpukit/score/src/coresem.c')
| -rw-r--r-- | cpukit/score/src/coresem.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/cpukit/score/src/coresem.c b/cpukit/score/src/coresem.c deleted file mode 100644 index 0e55926304..0000000000 --- a/cpukit/score/src/coresem.c +++ /dev/null @@ -1,184 +0,0 @@ -/* - * CORE Semaphore Handler - * - * DESCRIPTION: - * - * This package is the implementation of the CORE Semaphore Handler. - * This core object utilizes standard Dijkstra counting semaphores to provide - * 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/coresem.h> -#include <rtems/score/states.h> -#include <rtems/score/thread.h> -#include <rtems/score/threadq.h> -#include <rtems/score/mpci.h> - -/*PAGE - * - * CORE_semaphore_Initialize - * - * This function initialize a semaphore and sets the initial value based - * on the given count. - * - * Input parameters: - * the_semaphore - the semaphore control block to initialize - * the_class - the API class of the object - * the_semaphore_attributes - the attributes specified at create time - * initial_value - semaphore's initial value - * proxy_extract_callout - MP specific extract callout - * - * Output parameters: NONE - */ - -void _CORE_semaphore_Initialize( - CORE_semaphore_Control *the_semaphore, - Objects_Classes the_class, - CORE_semaphore_Attributes *the_semaphore_attributes, - unsigned32 initial_value, - Thread_queue_Extract_callout proxy_extract_callout -) -{ - - the_semaphore->Attributes = *the_semaphore_attributes; - the_semaphore->count = initial_value; - - _Thread_queue_Initialize( - &the_semaphore->Wait_queue, - the_class, - _CORE_semaphore_Is_priority( the_semaphore_attributes ) ? - THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO, - STATES_WAITING_FOR_SEMAPHORE, - proxy_extract_callout, - CORE_SEMAPHORE_TIMEOUT - ); -} - -/*PAGE - * - * _CORE_semaphore_Surrender - * - * Input parameters: - * the_semaphore - the semaphore to be flushed - * id - id of parent semaphore - * api_semaphore_mp_support - api dependent MP support actions - * - * Output parameters: - * CORE_SEMAPHORE_STATUS_SUCCESSFUL - if successful - * core error code - if unsuccessful - * - * Output parameters: - */ - -CORE_semaphore_Status _CORE_semaphore_Surrender( - CORE_semaphore_Control *the_semaphore, - Objects_Id id, - CORE_semaphore_API_mp_support_callout api_semaphore_mp_support -) -{ - Thread_Control *the_thread; - - if ( (the_thread = _Thread_queue_Dequeue(&the_semaphore->Wait_queue)) ) { - - if ( !_Objects_Is_local_id( the_thread->Object.id ) ) - (*api_semaphore_mp_support) ( the_thread, id ); - - } else - the_semaphore->count += 1; - - return( CORE_SEMAPHORE_STATUS_SUCCESSFUL ); -} - -/*PAGE - * - * _CORE_semaphore_Seize - * - * This routine attempts to allocate a core semaphore to the calling thread. - * - * Input parameters: - * the_semaphore - pointer to semaphore 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_semaphore_Seize( - CORE_semaphore_Control *the_semaphore, - Objects_Id id, - boolean wait, - Watchdog_Interval timeout -) -{ - Thread_Control *executing; - ISR_Level level; - - executing = _Thread_Executing; - executing->Wait.return_code = CORE_SEMAPHORE_STATUS_SUCCESSFUL; - _ISR_Disable( level ); - if ( the_semaphore->count != 0 ) { - the_semaphore->count -= 1; - _ISR_Enable( level ); - return; - } - - if ( !wait ) { - _ISR_Enable( level ); - executing->Wait.return_code = CORE_SEMAPHORE_STATUS_UNSATISFIED_NOWAIT; - return; - } - - _Thread_queue_Enter_critical_section( &the_semaphore->Wait_queue ); - executing->Wait.queue = &the_semaphore->Wait_queue; - executing->Wait.id = id; - _ISR_Enable( level ); - - _Thread_queue_Enqueue( &the_semaphore->Wait_queue, timeout ); -} - - -/*PAGE - * - * _CORE_semaphore_Flush - * - * This function a flushes the semaphore's task wait queue. - * - * Input parameters: - * the_semaphore - the semaphore to be flushed - * remote_extract_callout - function to invoke remotely - * status - status to pass to thread - * - * Output parameters: NONE - */ - -void _CORE_semaphore_Flush( - CORE_semaphore_Control *the_semaphore, - Thread_queue_Flush_callout remote_extract_callout, - unsigned32 status -) -{ - - _Thread_queue_Flush( - &the_semaphore->Wait_queue, - remote_extract_callout, - status - ); - -} |