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2001-01-22 Joel Sherrill <joel@OARcorp.com>

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* include/rtems/rtems/timer.h, src/timerserver.c: Add priority
	argument to rtems_timer_initiate_server().
This commit is contained in:
Joel Sherrill
2002-01-22 19:13:10 +00:00
parent cbc4e6fad7
commit 1ad83eb8d8
6 changed files with 82 additions and 38 deletions
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5
c/src/exec/rtems/ChangeLog
View File

@@ -1,3 +1,8 @@
2001-01-22 Joel Sherrill <joel@OARcorp.com>
* include/rtems/rtems/timer.h, src/timerserver.c: Add priority
argument to rtems_timer_initiate_server().
2001-01-18 Joel Sherrill <joel@OARcorp.com>
* include/rtems/system.h: Only include cpuopts.h when building a

3
c/src/exec/rtems/include/rtems/rtems/timer.h
View File

@@ -310,7 +310,10 @@ rtems_status_code rtems_timer_reset(
* It must be invoked before any task-based timers can be initiated.
*/
#define RTEMS_TIMER_SERVER_DEFAULT_PRIORITY -1
rtems_status_code rtems_timer_initiate_server(
unsigned32 priority,
unsigned32 stack_size,
rtems_attribute attribute_set
);

48
c/src/exec/rtems/src/timerserver.c
View File

@@ -147,8 +147,9 @@ Thread _Timer_Server_body(
* It must be invoked before any task-based timers can be initiated.
*
* Input parameters:
* priority - timer server priority
* stack_size - stack size in bytes
* attribute_set - thread attributes
* attribute_set - timer server attributes
*
* Output parameters:
* RTEMS_SUCCESSFUL - if successful
@@ -157,12 +158,24 @@ Thread _Timer_Server_body(
rtems_status_code rtems_timer_initiate_server(
unsigned32 priority,
unsigned32 stack_size,
rtems_attribute attribute_set
)
{
rtems_id id;
rtems_status_code status;
rtems_task_priority _priority;
/*
* Make sure the requested priority is valid.
*/
_priority = priority;
if ( priority == RTEMS_TIMER_SERVER_DEFAULT_PRIORITY )
_priority = 0;
else if ( !_RTEMS_tasks_Priority_is_valid( priority ) )
return RTEMS_INVALID_PRIORITY;
/*
* Just to make sure the test versus create/start operation are atomic.
@@ -176,17 +189,28 @@ rtems_status_code rtems_timer_initiate_server(
}
/*
* Create the Timer Server with the name the name of "TIME". The priority
* is always "0" which makes it higher than any other task in the system.
* It is also always NO_PREEMPT so it looks like an interrupt to other tasks.
* Create the Timer Server with the name the name of "TIME". The attribute
* RTEMS_SYSTEM_TASK allows us to set a priority to 0 which will makes it
* higher than any other task in the system. It can be viewed as a low
* priority interrupt. It is also always NO_PREEMPT so it looks like
* an interrupt to other tasks.
*
* We allow the user to override the default priority because the Timer
* Server can invoke TSRs which must adhere to language run-time or
* other library rules. For example, if using a TSR written in Ada the
* Server should run at the same priority as the priority Ada task.
* Otherwise, the priority ceiling for the mutex used to protect the
* GNAT run-time is violated.
*/
status = rtems_task_create(
rtems_build_name( 'T', 'I', 'M', 'E' ),
1, /* create with priority 1 since 0 is illegal */
0x4954454d, /* "TIME" */
_priority, /* create with priority 1 since 0 is illegal */
stack_size, /* let user specify stack size */
RTEMS_NO_PREEMPT, /* no preempt is like an interrupt */
attribute_set, /* user may want floating point */
/* user may want floating point but we need */
/* system task specified for 0 priority */
attribute_set | RTEMS_SYSTEM_TASK,
&id /* get the id back */
);
if (status) {
@@ -224,16 +248,6 @@ rtems_status_code rtems_timer_initiate_server(
_Objects_Get_index(id)
);
/*
* A priority of 0, higher than any user task, combined with no preemption
* makes this task the highest priority in any application. It can be
* viewed as a low priority interrupt. The FALSE argument indicates
* that the task is to be appended (not prepended) to its priority
* chain at the end of this operation.
*/
_Thread_Change_priority( _Timer_Server, 0, FALSE );
/*
* Initialize the timer lists that the server will manage.
*/

5
cpukit/rtems/ChangeLog
View File

@@ -1,3 +1,8 @@
2001-01-22 Joel Sherrill <joel@OARcorp.com>
* include/rtems/rtems/timer.h, src/timerserver.c: Add priority
argument to rtems_timer_initiate_server().
2001-01-18 Joel Sherrill <joel@OARcorp.com>
* include/rtems/system.h: Only include cpuopts.h when building a

3
cpukit/rtems/include/rtems/rtems/timer.h
View File

@@ -310,7 +310,10 @@ rtems_status_code rtems_timer_reset(
* It must be invoked before any task-based timers can be initiated.
*/
#define RTEMS_TIMER_SERVER_DEFAULT_PRIORITY -1
rtems_status_code rtems_timer_initiate_server(
unsigned32 priority,
unsigned32 stack_size,
rtems_attribute attribute_set
);

48
cpukit/rtems/src/timerserver.c
View File

@@ -147,8 +147,9 @@ Thread _Timer_Server_body(
* It must be invoked before any task-based timers can be initiated.
*
* Input parameters:
* priority - timer server priority
* stack_size - stack size in bytes
* attribute_set - thread attributes
* attribute_set - timer server attributes
*
* Output parameters:
* RTEMS_SUCCESSFUL - if successful
@@ -157,12 +158,24 @@ Thread _Timer_Server_body(
rtems_status_code rtems_timer_initiate_server(
unsigned32 priority,
unsigned32 stack_size,
rtems_attribute attribute_set
)
{
rtems_id id;
rtems_status_code status;
rtems_task_priority _priority;
/*
* Make sure the requested priority is valid.
*/
_priority = priority;
if ( priority == RTEMS_TIMER_SERVER_DEFAULT_PRIORITY )
_priority = 0;
else if ( !_RTEMS_tasks_Priority_is_valid( priority ) )
return RTEMS_INVALID_PRIORITY;
/*
* Just to make sure the test versus create/start operation are atomic.
@@ -176,17 +189,28 @@ rtems_status_code rtems_timer_initiate_server(
}
/*
* Create the Timer Server with the name the name of "TIME". The priority
* is always "0" which makes it higher than any other task in the system.
* It is also always NO_PREEMPT so it looks like an interrupt to other tasks.
* Create the Timer Server with the name the name of "TIME". The attribute
* RTEMS_SYSTEM_TASK allows us to set a priority to 0 which will makes it
* higher than any other task in the system. It can be viewed as a low
* priority interrupt. It is also always NO_PREEMPT so it looks like
* an interrupt to other tasks.
*
* We allow the user to override the default priority because the Timer
* Server can invoke TSRs which must adhere to language run-time or
* other library rules. For example, if using a TSR written in Ada the
* Server should run at the same priority as the priority Ada task.
* Otherwise, the priority ceiling for the mutex used to protect the
* GNAT run-time is violated.
*/
status = rtems_task_create(
rtems_build_name( 'T', 'I', 'M', 'E' ),
1, /* create with priority 1 since 0 is illegal */
0x4954454d, /* "TIME" */
_priority, /* create with priority 1 since 0 is illegal */
stack_size, /* let user specify stack size */
RTEMS_NO_PREEMPT, /* no preempt is like an interrupt */
attribute_set, /* user may want floating point */
/* user may want floating point but we need */
/* system task specified for 0 priority */
attribute_set | RTEMS_SYSTEM_TASK,
&id /* get the id back */
);
if (status) {
@@ -224,16 +248,6 @@ rtems_status_code rtems_timer_initiate_server(
_Objects_Get_index(id)
);
/*
* A priority of 0, higher than any user task, combined with no preemption
* makes this task the highest priority in any application. It can be
* viewed as a low priority interrupt. The FALSE argument indicates
* that the task is to be appended (not prepended) to its priority
* chain at the end of this operation.
*/
_Thread_Change_priority( _Timer_Server, 0, FALSE );
/*
* Initialize the timer lists that the server will manage.
*/