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* score: Make functions inlineSebastian Huber2014-06-122-155/+114
| | | | | | These functions are used only via the function pointers in the generic SMP scheduler implementation. Provide them as static inline so that the compiler can optimize more easily.
* score: Move NULL pointer check to order functionSebastian Huber2014-06-122-17/+30
| | | | This helps to avoid untestable code for the normal SMP schedulers.
* score: Fix warningsSebastian Huber2014-06-121-2/+1
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* score: FormatSebastian Huber2014-06-121-43/+43
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* score: Add missing inlineSebastian Huber2014-06-121-2/+2
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* score: Fix scheduler context initializerSebastian Huber2014-06-121-3/+3
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* Add SMP Priority Scheduler with AffinityJoel Sherrill2014-06-118-77/+745
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This scheduler attempts to account for needed thread migrations caused as a side-effect of a thread state, affinity, or priority change operation. This scheduler has its own allocate_processor handler named _Scheduler_SMP_Allocate_processor_exact() because _Scheduler_SMP_Allocate_processor() attempts to prevent an executing thread from moving off its current CPU without considering affinity. Without this, the scheduler makes all the right decisions and then they are discarded at the end. ==Side Effects of Adding This Scheduler== Added Thread_Control * parameter to Scheduler_SMP_Get_highest_ready type so methods looking for the highest ready thread can filter by the processor on which the thread blocking resides. This allows affinity to be considered. Simple Priority SMP and Priority SMP ignore this parameter. + Added get_lowest_scheduled argument to _Scheduler_SMP_Enqueue_ordered(). + Added allocate_processor argument to the following methods: - _Scheduler_SMP_Block() - _Scheduler_SMP_Enqueue_scheduled_ordered() - _Scheduler_SMP_Enqueue_scheduled_ordered() + schedulerprioritysmpimpl.h is a new file with prototypes for methods which were formerly static in schedulerprioritysmp.c but now need to be public to be shared with this scheduler. NOTE: _Scheduler_SMP_Get_lowest_ready() appears to have a path which would allow it to return a NULL. Previously, _Scheduler_SMP_Enqueue_ordered() would have asserted on it. If it cannot return a NULL, _Scheduler_SMP_Get_lowest_ready() should have an assertions.
* score: Fix MrsP root node updateSebastian Huber2014-06-101-1/+1
| | | | Set the new root after the resource tree update.
* score: _Per_CPU_State_wait_for_non_initial_state()Sebastian Huber2014-06-053-24/+72
| | | | | Replace _Per_CPU_State_wait_for_ready_to_start_multitasking() with _Per_CPU_State_wait_for_non_initial_state(). Implement this function.
* score: Avoid NULL pointer accessSebastian Huber2014-06-051-2/+3
| | | | | | Check that the executing thread is not NULL in _Scheduler_Tick(). It may be NULL in case the processor has an optional scheduler assigned and the system was not able to start the processor.
* score: Delete SMP_FATAL_SHUTDOWN_EARLYSebastian Huber2014-06-051-4/+3
| | | | Sort enum lexicographically.
* remove not updated NEWS fileDaniel Hellstrom2014-06-051-7/+0
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* shell: Add rtems_shell_dup_current_env to get a default env.Chris Johns2014-06-044-20/+40
| | | | | | | | Remove rtems_current_shell_env as this is dangerous because the env can be NULL if used outside of a valid shell with the POSIX key to an env set up. Clean up the usage of rtems_current_shell_env.
* score: Rename _Scheduler_Update()Sebastian Huber2014-06-0415-43/+68
| | | | | | Rename _Scheduler_Update() to _Scheduler_Update_priority(). Add parameter for the new thread priority to avoid direct usage of Thread_Control::current_priority in the scheduler operation.
* score: Replace _Scheduler_Allocate/Free()Sebastian Huber2014-06-0419-92/+99
| | | | | | | | Replace _Scheduler_Allocate() with _Scheduler_Node_initialize(). Remove the return status and thus the node initialization must be always successful. Rename _Scheduler_Free() to _Scheduler_Node_destroy().
* score/sparc: Add support for paravirtualizationChristian Mauderer2014-06-033-18/+45
| | | | | | | Guest systems in paravirtualization environments run usually in user mode. Thus it is not possible to directly access the PSR and TBR registers. Use functions instead of inline assembler to access these registers if RTEMS_PARAVIRT is defined.
* libblock: Avoid recursive mutexSebastian Huber2014-06-031-9/+10
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* score: Use Resource Handler for MrsP semaphoresSebastian Huber2014-06-032-35/+112
| | | | | This enables proper resource dependency tracking and as a side-effect deadlock detection.
* score: Add resource node to thread control blockSebastian Huber2014-06-033-0/+20
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* score: Add and use _Thread_Owns_resources()Sebastian Huber2014-06-035-5/+22
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* score: Add Resource HandlerSebastian Huber2014-06-035-0/+491
| | | | | | | | | | A resource is something that has at most one owner at a time and may have multiple rivals in case an owner is present. The owner and rivals are impersonated via resource nodes. A resource is represented via the resource control structure. The resource controls and nodes are organized as trees. It is possible to detect deadlocks via such a resource tree. The _Resource_Iterate() function can be used to iterate through such a resource tree starting at a top node.
* libblock: Add RTEMS_BDBUF_USE_PTHREADRalf Kirchner2014-06-023-72/+230
| | | | | | Use the PTHREAD mutexes and condition variables if available. This helps on SMP configurations to avoid the home grown condition variables via disabled preemption.
* rtems: Avoid copy and paste in confdefs.hRalf Kirchner2014-06-021-32/+48
| | | | | Add and use CONFIGURE_POSIX_MUTEXES. Add and use CONFIGURE_POSIX_CONDITION_VARIABLES.
* arm: Add ARM_MULTILIB_HAS_BARRIER_INSTRUCTIONSSebastian Huber2014-06-022-0/+7
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* libblock: Use pthread_once() for initializationRalf Kirchner2014-06-021-29/+25
| | | | | | Enabling and disabling preemption as done for single core will not work for SMP. In the bdbuf initialization preemption handling can be avoided in general by using pthread_once().
* score: _Scheduler_Set_affinity()Sebastian Huber2014-06-023-44/+29
| | | | | Do not change the scheduler with this function. Documentation. Coding style.
* score: _Scheduler_Get_affinity()Sebastian Huber2014-06-024-29/+24
| | | | Drop scheduler parameter. Coding style.
* rtems: Coding styleSebastian Huber2014-06-021-19/+15
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* cpusetimpl.h: Add _CPU_set_Set() and improve DoxygenJoel Sherrill2014-05-301-25/+69
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* Minor conditionals to enable building Scheduler Simulator on GNU/LinuxJoel Sherrill2014-05-302-5/+25
| | | | | | | | | | | - rtems/score/assert.h: Scheduler Simulator uses glibc assert.h on GNU/Linux. This will likely need to be adjusted more for other host compilers and C libraries. Also disable _Assert_Not_reached() because some of these paths do actually return to the called on the Scheduler Simulator. - basedefs.h: Do not use noreturn attribute when on Scheduler Simulator. Paths which context switch can return to the command interpreter on the Scheduler Simulator.
* rtems/score/thread*.h: Really correct spelling errorJoel Sherrill2014-05-282-3/+3
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* rtems/score/thread*.h: TERMINTING to TERMINATINGJoel Sherrill2014-05-282-3/+3
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* shell: Make rtems_global_shell_env publicSebastian Huber2014-05-282-1/+3
| | | | | Provide rtems_global_shell_env as a public read-only variable for backward compatibility.
* score: Multiprocessor Resource Sharing ProtocolSebastian Huber2014-05-2817-11/+758
| | | | | | | | | | | | | | | | | | | | | | Add basic support for the Multiprocessor Resource Sharing Protocol (MrsP). The Multiprocessor Resource Sharing Protocol (MrsP) is defined in A. Burns and A.J. Wellings, A Schedulability Compatible Multiprocessor Resource Sharing Protocol - MrsP, Proceedings of the 25th Euromicro Conference on Real-Time Systems (ECRTS 2013), July 2013. It is a generalization of the Priority Ceiling Protocol to SMP systems. Each MrsP semaphore uses a ceiling priority per scheduler instance. These ceiling priorities can be specified with rtems_semaphore_set_priority(). A task obtaining or owning a MrsP semaphore will execute with the ceiling priority for its scheduler instance as specified by the MrsP semaphore object. Tasks waiting to get ownership of a MrsP semaphore will not relinquish the processor voluntarily. In case the owner of a MrsP semaphore gets preempted it can ask all tasks waiting for this semaphore to help out and temporarily borrow the right to execute on one of their assigned processors. The help out feature is not implemented with this patch.
* score: Fix race condition in SMP startupSebastian Huber2014-05-262-2/+10
| | | | | | | | | | | | | | Do not use the Per_CPU_Control::started in _SMP_Start_multitasking_on_secondary_processor() since this field may be not up to date when a secondary processor reads it. Use the read-only scheduler assignment instead. Add a new fatal error SMP_FATAL_MULTITASKING_START_ON_INVALID_PROCESSOR. This prevents out-of-bounds access. It is currently not possible to test these fatal errors. One option would be to fake values of the _CPU_SMP_Get_current_processor(), but unfortunately this function is inline on some architectures.
* SPARC: add syscall 1 (exit) function entry pointDaniel Hellstrom2014-05-231-0/+25
| | | | | | The exit SPARC system call doesn't have a function entry point like the others do. This is probably why people use TA 0x0 instruction directly for shutting down the system.
* score: Use _SMP_Fatal()Sebastian Huber2014-05-231-1/+1
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* SMP: make IPI fatal code uniqueDaniel Hellstrom2014-05-231-2/+3
| | | | | | | | | | The same smp fatal code is used in percpu _Per_CPU_State_change(). In order to determine which CPU requested a fatal shutdown and which CPU responds to it a unique code should be used. A unique code makes it also possible to handle the CPUs differently in the fatal exception handler.
* score: PR2179: Fix initially locked PCP mutexesSebastian Huber2014-05-231-3/+16
| | | | | Elevate the priority of the creating task to the ceiling priority in case a semaphore is created as initially locked.
* cpuset.c: Fix formattingJoel Sherrill2014-05-221-3/+3
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* rtems: Fix sp2038 test.Chris Johns2014-05-221-14/+93
| | | | | | | | Avoid using newlib's gmtime_r call which fails with a max signed int. Add an RTEMS specific version for 1/1/1988 to 31/12/2100. Update sp2038 to test every day from 1/1/1988 to 31/12/2100. Only days need be tested as the code splits the seconds based on days.
* rtems: Simplify rtems_semaphore_obtain()Sebastian Huber2014-05-221-2/+4
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* schedulersmpimpl.h: Fix spacingJoel Sherrill2014-05-211-2/+2
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* score: _Thread_Set_life_protection()Sebastian Huber2014-05-211-4/+0
| | | | | | | Enable usage of _Thread_Set_life_protection() in thread dispatch critical sections. This can be used to enable the thread life-protection with thread dispatching disabled and then enable thread dispatching.
* score: Add and use _Scheduler_Get_index_by_id()Sebastian Huber2014-05-211-2/+8
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* score: Add const qualifierSebastian Huber2014-05-211-1/+1
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* score: Add comment regarding TLS workspace sizeSebastian Huber2014-05-211-0/+8
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* score: Simplify _Scheduler_Set()Sebastian Huber2014-05-211-1/+1
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* rtems: Clarify task set/get scheduler parametersSebastian Huber2014-05-203-10/+10
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* score: SMP scheduler support documentationSebastian Huber2014-05-201-1/+5
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