forked from Imagelibrary/rtems
d19cce29dc
Use a per-CPU thread dispatch disable level. So instead of one global thread dispatch disable level we have now one instance per processor. This is a major performance improvement for SMP. On non-SMP configurations this may simplifiy the interrupt entry/exit code. The giant lock is still present, but it is now decoupled from the thread dispatching in _Thread_Dispatch(), _Thread_Handler(), _Thread_Restart_self() and the interrupt entry/exit. Access to the giant lock is now available via _Giant_Acquire() and _Giant_Release(). The giant lock is still implicitly acquired via _Thread_Dispatch_decrement_disable_level(). The giant lock is only acquired for high-level operations in interrupt handlers (e.g. release of a semaphore, sending of an event). As a side-effect this change fixes the lost thread dispatch necessary indication bug in _Thread_Dispatch(). A per-CPU thread dispatch disable level greatly simplifies the SMP support for the interrupt entry/exit code since no spin locks have to be acquired in this area. It is only necessary to get the current processor index and use this to calculate the address of the own per-CPU control. This reduces the interrupt latency considerably. All elements for the interrupt entry/exit code are now part of the Per_CPU_Control structure: thread dispatch disable level, ISR nest level and thread dispatch necessary. Nothing else is required (except CPU port specific stuff like on SPARC).
110 lines
2.3 KiB
C
110 lines
2.3 KiB
C
/*
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* COPYRIGHT (c) 1989-2009.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#define CONFIGURE_INIT
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#include "system.h"
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rtems_id Semaphore_id;
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rtems_task High_tasks(
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rtems_task_argument argument
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);
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rtems_task Low_task(
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rtems_task_argument argument
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);
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rtems_task Init(
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rtems_task_argument argument
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)
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{
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rtems_id task_id;
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uint32_t index;
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rtems_status_code status;
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Print_Warning();
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puts( "\n\n*** TIME TEST 25 ***" );
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status = rtems_semaphore_create(
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rtems_build_name( 'S', 'M', '1', ' ') ,
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0,
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RTEMS_DEFAULT_ATTRIBUTES,
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RTEMS_NO_PRIORITY,
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&Semaphore_id
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);
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directive_failed( status, "rtems_semaphore_create of SM1" );
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status = rtems_task_create(
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rtems_build_name( 'L', 'O', 'W', ' ' ),
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RTEMS_MAXIMUM_PRIORITY - 1u,
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RTEMS_MINIMUM_STACK_SIZE,
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RTEMS_DEFAULT_MODES,
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RTEMS_DEFAULT_ATTRIBUTES,
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&task_id
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);
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directive_failed( status, "rtems_task_create LOW" );
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status = rtems_task_start( task_id, Low_task, 0 );
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directive_failed( status, "rtems_task_start LOW" );
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for ( index=1 ; index <= OPERATION_COUNT ; index++ ) {
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status = rtems_task_create(
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rtems_build_name( 'T', 'I', 'M', 'E' ),
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(RTEMS_MAXIMUM_PRIORITY / 2u) + 1u,
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RTEMS_MINIMUM_STACK_SIZE,
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RTEMS_DEFAULT_MODES,
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RTEMS_DEFAULT_ATTRIBUTES,
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&task_id
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);
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directive_failed( status, "rtems_task_create LOOP" );
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status = rtems_task_start( task_id, High_tasks, 0 );
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directive_failed( status, "rtems_task_start LOOP" );
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}
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status = rtems_task_delete( RTEMS_SELF );
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directive_failed( status, "rtems_task_delete of RTEMS_SELF" );
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}
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rtems_task High_tasks(
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rtems_task_argument argument
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)
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{
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(void) rtems_semaphore_obtain(
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Semaphore_id,
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RTEMS_DEFAULT_OPTIONS,
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0xffffffff
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);
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}
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rtems_task Low_task(
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rtems_task_argument argument
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)
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{
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benchmark_timer_initialize();
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(void) rtems_clock_tick();
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end_time = benchmark_timer_read();
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put_time(
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"rtems_clock_tick",
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end_time,
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1,
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0,
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CALLING_OVERHEAD_CLOCK_TICK
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);
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puts( "*** END OF TEST 25 ***" );
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rtems_test_exit( 0 );
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}
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