Imagelibrary/rtems
1
0
Fork 1
mirror of https://gitlab.rtems.org/rtems/rtos/rtems.git synced 2025-12-25 22:07:15 +00:00
Code Issues Packages Projects Releases Wiki Activity

Split core mutex and semaphore handlers into separate files.

Browse Source
This commit is contained in:
Joel Sherrill
1999-11-02 21:48:15 +00:00
parent 82cb78d84c
commit 7cc8d6c3b1
12 changed files with 1122 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
c/src/exec/score/src/coremutexflush.c Normal file
View File

@@ -0,0 +1,52 @@
/*
* Mutex Handler
*
* DESCRIPTION:
*
* This package is the implementation of the Mutex Handler.
* This handler provides synchronization and mutual exclusion capabilities.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#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_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
);
}

156
c/src/exec/score/src/coremutexseize.c Normal file
View File

@@ -0,0 +1,156 @@
/*
* Mutex Handler
*
* DESCRIPTION:
*
* This package is the implementation of the Mutex Handler.
* This handler provides synchronization and mutual exclusion capabilities.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#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_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;
switch ( the_mutex->Attributes.discipline ) {
case CORE_MUTEX_DISCIPLINES_FIFO:
case CORE_MUTEX_DISCIPLINES_PRIORITY:
case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
break;
case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
if ( executing->current_priority <
the_mutex->Attributes.priority_ceiling) {
executing->Wait.return_code = CORE_MUTEX_STATUS_CEILING_VIOLATED;
return;
}
}
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 );
switch ( the_mutex->Attributes.discipline ) {
case CORE_MUTEX_DISCIPLINES_FIFO:
case CORE_MUTEX_DISCIPLINES_PRIORITY:
case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
/* already the highest priority */
break;
case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
if ( the_mutex->Attributes.priority_ceiling <
executing->current_priority ) {
_Thread_Change_priority(
the_mutex->holder,
the_mutex->Attributes.priority_ceiling,
FALSE
);
}
}
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 );
switch ( the_mutex->Attributes.discipline ) {
case CORE_MUTEX_DISCIPLINES_FIFO:
case CORE_MUTEX_DISCIPLINES_PRIORITY:
case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
break;
case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
if ( the_mutex->holder->current_priority > executing->current_priority ) {
_Thread_Change_priority(
the_mutex->holder,
executing->current_priority,
FALSE
);
}
break;
}
_Thread_queue_Enqueue( &the_mutex->Wait_queue, timeout );
if ( _Thread_Executing->Wait.return_code == CORE_MUTEX_STATUS_SUCCESSFUL ) {
switch ( the_mutex->Attributes.discipline ) {
case CORE_MUTEX_DISCIPLINES_FIFO:
case CORE_MUTEX_DISCIPLINES_PRIORITY:
case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
break;
case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
if ( the_mutex->Attributes.priority_ceiling <
executing->current_priority ) {
_Thread_Change_priority(
executing,
the_mutex->Attributes.priority_ceiling,
FALSE
);
};
break;
}
}
}

139
c/src/exec/score/src/coremutexsurrender.c Normal file
View File

@@ -0,0 +1,139 @@
/*
* Mutex Handler
*
* DESCRIPTION:
*
* This package is the implementation of the Mutex Handler.
* This handler provides synchronization and mutual exclusion capabilities.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#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>
/*
* _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;
Thread_Control *executing;
executing = _Thread_Executing;
/*
* The following code allows a thread (or ISR) other than the thread
* which acquired the mutex to release that mutex. This is only
* allowed when the mutex in quetion is FIFO or simple Priority
* discipline. But Priority Ceiling or Priority Inheritance mutexes
* must be released by the thread which acquired them.
*/
if ( !_Objects_Are_ids_equal(
_Thread_Executing->Object.id, the_mutex->holder_id ) ) {
switch ( the_mutex->Attributes.discipline ) {
case CORE_MUTEX_DISCIPLINES_FIFO:
case CORE_MUTEX_DISCIPLINES_PRIORITY:
break;
case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
return( CORE_MUTEX_STATUS_NOT_OWNER_OF_RESOURCE );
break;
}
}
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.
*/
switch ( the_mutex->Attributes.discipline ) {
case CORE_MUTEX_DISCIPLINES_FIFO:
case CORE_MUTEX_DISCIPLINES_PRIORITY:
break;
case CORE_MUTEX_DISCIPLINES_PRIORITY_CEILING:
case CORE_MUTEX_DISCIPLINES_PRIORITY_INHERIT:
if ( executing->resource_count == 0 &&
executing->real_priority != executing->current_priority ) {
_Thread_Change_priority( executing, executing->real_priority, TRUE );
}
break;
}
if ( ( the_thread = _Thread_queue_Dequeue( &the_mutex->Wait_queue ) ) ) {
#if defined(RTEMS_MULTIPROCESSING)
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
#endif
{
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 or priority ceiling
* 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 );
}

58
c/src/exec/score/src/coresemflush.c Normal file
View File

@@ -0,0 +1,58 @@
/*
* 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) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#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>
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/score/mpci.h>
#endif
/*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
);
}

81
c/src/exec/score/src/coresemseize.c Normal file
View File

@@ -0,0 +1,81 @@
/*
* 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) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#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>
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/score/mpci.h>
#endif
/*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 );
}

75
c/src/exec/score/src/coresemsurrender.c Normal file
View File

@@ -0,0 +1,75 @@
/*
* 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) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#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>
#if defined(RTEMS_MULTIPROCESSING)
#include <rtems/score/mpci.h>
#endif
/*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;
ISR_Level level;
CORE_semaphore_Status status;
status = CORE_SEMAPHORE_STATUS_SUCCESSFUL;
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 {
_ISR_Disable( level );
if ( the_semaphore->count <= the_semaphore->Attributes.maximum_count )
the_semaphore->count += 1;
else
status = CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED;
_ISR_Enable( level );
}
return status;
}