168695c7ef
These two fields in the thread structure control the preemptibility of a thread. sched_locked is decremented when the scheduler gets locked, which means that the scheduler is locked for values 0xff to 0x01, since it can be locked recursively. A thread is coop if its priority is negative, thus if the prio field value is 0x80 to 0xff when looked at as an unsigned value. By putting them end-to-end, this means that a thread is non-preemptible if the bundled value is greater than or equal to 0x0080. This is the only thing the interrupt exit code has to check to decide to try a reschedule or not. Change-Id: I902d36c14859d0d7a951a6aa1bea164613821aca Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* Copyright (c) 2016 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _offsets_short__h_
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#define _offsets_short__h_
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#include <offsets.h>
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#include <offsets_short_arch.h>
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/* kernel */
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/* main */
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#define _kernel_offset_to_nested \
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(___kernel_t_nested_OFFSET)
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#define _kernel_offset_to_irq_stack \
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(___kernel_t_irq_stack_OFFSET)
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#define _kernel_offset_to_current \
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(___kernel_t_current_OFFSET)
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#define _kernel_offset_to_idle \
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(___kernel_t_idle_OFFSET)
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#define _kernel_offset_to_current_fp \
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(___kernel_t_current_fp_OFFSET)
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#define _kernel_offset_to_ready_q_cache \
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(___kernel_t_ready_q_OFFSET + ___ready_q_t_cache_OFFSET)
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/* end - kernel */
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/* threads */
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/* main */
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#define _thread_offset_to_callee_saved \
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(___thread_t_callee_saved_OFFSET)
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/* base */
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#define _thread_offset_to_thread_state \
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(___thread_t_base_OFFSET + ___thread_base_t_thread_state_OFFSET)
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#define _thread_offset_to_execution_flags \
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(___thread_t_base_OFFSET + ___thread_base_t_execution_flags_OFFSET)
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#define _thread_offset_to_prio \
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(___thread_t_base_OFFSET + ___thread_base_t_prio_OFFSET)
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#define _thread_offset_to_sched_locked \
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(___thread_t_base_OFFSET + ___thread_base_t_sched_locked_OFFSET)
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#define _thread_offset_to_preempt \
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(___thread_t_base_OFFSET + ___thread_base_t_preempt_OFFSET)
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#define _thread_offset_to_esf \
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(___thread_t_arch_OFFSET + ___thread_arch_t_esf_OFFSET)
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/* end - threads */
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#endif /* _offsets_short__h_ */
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