kernel: expose struct k_thread implementation
Historically, space for struct k_thread was always carved out of the thread's stack region. However, we want more control on where this data will reside; in memory protection scenarios the stack may only be used for actual stack data and nothing else. On some platforms (particularly ARM), including kernel_arch_data.h from the toplevel kernel.h exposes intractable circular dependency issues. We create a new per-arch header "kernel_arch_thread.h" with very limited scope; it only defines the three data structures necessary to instantiate the arch-specific bits of a struct k_thread. Change-Id: I3a55b4ed4270512e58cf671f327bb033ad7f4a4f Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
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17 changed files with 939 additions and 727 deletions
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@ -56,119 +56,6 @@
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#if !defined(_ASMLANGUAGE)
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#ifdef CONFIG_THREAD_MONITOR
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struct __thread_entry {
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_thread_entry_t pEntry;
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void *parameter1;
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void *parameter2;
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void *parameter3;
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};
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#endif
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#if defined(CONFIG_THREAD_STACK_INFO)
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/* Contains the stack information of a thread */
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struct _thread_stack_info {
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/* Stack Start */
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u32_t start;
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/* Stack Size */
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u32_t size;
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};
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#endif /* CONFIG_THREAD_STACK_INFO */
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/* can be used for creating 'dummy' threads, e.g. for pending on objects */
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struct _thread_base {
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/* this thread's entry in a ready/wait queue */
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sys_dnode_t k_q_node;
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/* user facing 'thread options'; values defined in include/kernel.h */
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u8_t user_options;
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/* thread state */
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u8_t thread_state;
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/*
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* scheduler lock count and thread priority
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*
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* These two fields control the preemptibility of a thread.
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*
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* When the scheduler is locked, sched_locked is decremented, which
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* means that the scheduler is locked for values from 0xff to 0x01. A
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* thread is coop if its prio is negative, thus 0x80 to 0xff when
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* looked at the value as unsigned.
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*
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* By putting them end-to-end, this means that a thread is
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* non-preemptible if the bundled value is greater than or equal to
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* 0x0080.
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*/
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union {
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struct {
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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u8_t sched_locked;
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s8_t prio;
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#else /* LITTLE and PDP */
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s8_t prio;
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u8_t sched_locked;
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#endif
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};
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u16_t preempt;
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};
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/* data returned by APIs */
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void *swap_data;
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#ifdef CONFIG_SYS_CLOCK_EXISTS
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/* this thread's entry in a timeout queue */
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struct _timeout timeout;
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#endif
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};
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typedef struct _thread_base _thread_base_t;
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struct k_thread {
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struct _thread_base base;
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/* defined by the architecture, but all archs need these */
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struct _caller_saved caller_saved;
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struct _callee_saved callee_saved;
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/* static thread init data */
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void *init_data;
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/* abort function */
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void (*fn_abort)(void);
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#if defined(CONFIG_THREAD_MONITOR)
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/* thread entry and parameters description */
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struct __thread_entry *entry;
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/* next item in list of all threads */
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struct k_thread *next_thread;
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#endif
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#ifdef CONFIG_THREAD_CUSTOM_DATA
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/* crude thread-local storage */
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void *custom_data;
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#endif
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#ifdef CONFIG_ERRNO
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/* per-thread errno variable */
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int errno_var;
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#endif
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#if defined(CONFIG_THREAD_STACK_INFO)
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/* Stack Info */
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struct _thread_stack_info stack_info;
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#endif /* CONFIG_THREAD_STACK_INFO */
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/* arch-specifics: must always be at the end */
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struct _thread_arch arch;
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};
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typedef struct k_thread _thread_t;
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struct _ready_q {
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/* always contains next thread to run: cannot be NULL */
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