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Replace _Per_CPU_State_wait_for_ready_to_start_multitasking() with
_Per_CPU_State_wait_for_non_initial_state(). Implement this function.
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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.
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Sort enum lexicographically.
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The GRETH doesn't support IP fragments.
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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.
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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.
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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().
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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.
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This enables proper resource dependency tracking and as a side-effect
deadlock detection.
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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.
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Use the PTHREAD mutexes and condition variables if available. This
helps on SMP configurations to avoid the home grown condition variables
via disabled preemption.
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Add and use CONFIGURE_POSIX_MUTEXES.
Add and use CONFIGURE_POSIX_CONDITION_VARIABLES.
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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().
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Do not change the scheduler with this function. Documentation. Coding
style.
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Drop scheduler parameter. Coding style.
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- 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.
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This reverts commit dac56968e343cccfcae46e25805ede1a8d67550a.
Use local git ignore for development tool files.
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Provide rtems_global_shell_env as a public read-only variable for
backward compatibility.
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The last optimization missed was incorrect in regards to
PSR write instruction delay must be 3 instructions.
New optimizations:
* align to 32-byte cache line.
* rearrange code into three "blocks" of 4 instructions that
is executed by syscall 2 and 3. This is to optimize for
16/32 byte cache lines.
* use delay-slot instruction in trap table to reduce by one
instruction.
* use the fact that "wr %PSR" implements XOR to reduce by
one instruction.
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The following BSPs do not have tick support so the tests fail:
arm1136jfs
arm1136js
arm7tdmi
arm920
armcortexa9 (does not run any more)
avrtest
h8sim
h8sxsim
m32csim
m32rsim
moxiesim
simsh1
simsh2
simsh4
v850e1sim
v850e2sim
v850e2v3sim
v850esim
v850essim
v850sim
This list was provided by Joel in the following post:
http://www.rtems.org/pipermail/rtems-devel/2014-April/006526.html
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BSPs for simulators which do not include a clock tick interrupt source
are incapable of running some tests successfully. This is a common
characteristic of some BSPs and a fixed set of tests. There is no point
in duplicating this list of tests in those BSPs test configuration.
Read testsuites/testdata/require-tick-isr.tcfg for details.
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Network mbufs and clusters now are cached. Thus the nocache heap can get reduced to 1 MByte.
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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.
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