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https://github.com/zephyrproject-rtos/zephyr
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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>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
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* Copyright (c) 2013-2014 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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#include <device.h>
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#ifndef _kernel_offsets__h_
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#define _kernel_offsets__h_
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/*
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* The final link step uses the symbol _OffsetAbsSyms to force the linkage of
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* offsets.o into the ELF image.
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*/
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GEN_ABS_SYM_BEGIN(_OffsetAbsSyms)
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GEN_OFFSET_SYM(_kernel_t, current);
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#if defined(CONFIG_THREAD_MONITOR)
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GEN_OFFSET_SYM(_kernel_t, threads);
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#endif
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GEN_OFFSET_SYM(_kernel_t, nested);
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GEN_OFFSET_SYM(_kernel_t, irq_stack);
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#ifdef CONFIG_SYS_POWER_MANAGEMENT
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GEN_OFFSET_SYM(_kernel_t, idle);
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#endif
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GEN_OFFSET_SYM(_kernel_t, ready_q);
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GEN_OFFSET_SYM(_kernel_t, arch);
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GEN_OFFSET_SYM(_ready_q_t, cache);
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#ifdef CONFIG_FP_SHARING
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GEN_OFFSET_SYM(_kernel_t, current_fp);
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#endif
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GEN_ABSOLUTE_SYM(_STRUCT_KERNEL_SIZE, sizeof(struct _kernel));
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GEN_OFFSET_SYM(_thread_base_t, execution_flags);
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GEN_OFFSET_SYM(_thread_base_t, thread_state);
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GEN_OFFSET_SYM(_thread_base_t, prio);
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GEN_OFFSET_SYM(_thread_base_t, sched_locked);
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GEN_OFFSET_SYM(_thread_base_t, preempt);
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GEN_OFFSET_SYM(_thread_base_t, swap_data);
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GEN_OFFSET_SYM(_thread_t, base);
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GEN_OFFSET_SYM(_thread_t, caller_saved);
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GEN_OFFSET_SYM(_thread_t, callee_saved);
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GEN_OFFSET_SYM(_thread_t, arch);
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#if defined(CONFIG_THREAD_MONITOR)
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GEN_OFFSET_SYM(_thread_t, next_thread);
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#endif
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#ifdef CONFIG_THREAD_CUSTOM_DATA
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GEN_OFFSET_SYM(_thread_t, custom_data);
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#endif
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GEN_ABSOLUTE_SYM(K_THREAD_SIZEOF, sizeof(struct k_thread));
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/* size of the device structure. Used by linker scripts */
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GEN_ABSOLUTE_SYM(_DEVICE_STRUCT_SIZE, sizeof(struct device));
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#endif /* _kernel_offsets__h_ */
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