mirror of
https://github.com/zephyrproject-rtos/zephyr
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a7fffa9e00
Any word started with underscore followed by and uppercase letter or a second underscore is a reserved word according with C99. With have *many* violations on Zephyr's code, this commit is tackling only the violations caused by headers guards. It also takes the opportunity to normalize them using the filename in uppercase and replacing dot with underscore. e.g file.h -> FILE_H Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/*
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* Copyright (c) 2018 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_KERNEL_INCLUDE_KSWAP_H_
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#define ZEPHYR_KERNEL_INCLUDE_KSWAP_H_
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#include <ksched.h>
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#include <kernel_arch_func.h>
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#ifdef CONFIG_TIMESLICING
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extern void _update_time_slice_before_swap(void);
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#else
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#define _update_time_slice_before_swap() /**/
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#endif
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#ifdef CONFIG_STACK_SENTINEL
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extern void _check_stack_sentinel(void);
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#else
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#define _check_stack_sentinel() /**/
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#endif
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/* In SMP, the irq_lock() is a spinlock which is implicitly released
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* and reacquired on context switch to preserve the existing
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* semantics. This means that whenever we are about to return to a
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* thread (via either _Swap() or interrupt/exception return!) we need
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* to restore the lock state to whatever the thread's counter
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* expects.
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*/
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void _smp_reacquire_global_lock(struct k_thread *thread);
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void _smp_release_global_lock(struct k_thread *thread);
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/* context switching and scheduling-related routines */
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#ifdef CONFIG_USE_SWITCH
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/* New style context switching. _arch_switch() is a lower level
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* primitive that doesn't know about the scheduler or return value.
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* Needed for SMP, where the scheduler requires spinlocking that we
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* don't want to have to do in per-architecture assembly.
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*/
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static inline int _Swap(unsigned int key)
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{
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struct k_thread *new_thread, *old_thread;
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int ret = 0;
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#ifdef CONFIG_EXECUTION_BENCHMARKING
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extern void read_timer_start_of_swap(void);
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read_timer_start_of_swap();
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#endif
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old_thread = _current;
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_check_stack_sentinel();
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_update_time_slice_before_swap();
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#ifdef CONFIG_TRACING
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sys_trace_thread_switched_out();
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#endif
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new_thread = _get_next_ready_thread();
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if (new_thread != old_thread) {
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old_thread->swap_retval = -EAGAIN;
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#ifdef CONFIG_SMP
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_current_cpu->swap_ok = 0;
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new_thread->base.cpu = _arch_curr_cpu()->id;
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_smp_release_global_lock(new_thread);
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#endif
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_current = new_thread;
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_arch_switch(new_thread->switch_handle,
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&old_thread->switch_handle);
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ret = _current->swap_retval;
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}
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#ifdef CONFIG_TRACING
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sys_trace_thread_switched_in();
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#endif
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irq_unlock(key);
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return ret;
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}
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#else /* !CONFIG_USE_SWITCH */
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extern int __swap(unsigned int key);
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static inline int _Swap(unsigned int key)
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{
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int ret;
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_check_stack_sentinel();
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_update_time_slice_before_swap();
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#ifdef CONFIG_TRACING
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sys_trace_thread_switched_out();
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#endif
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ret = __swap(key);
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#ifdef CONFIG_TRACING
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sys_trace_thread_switched_in();
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#endif
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return ret;
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}
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#endif
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#endif /* ZEPHYR_KERNEL_INCLUDE_KSWAP_H_ */
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