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kernel: add k_thread_create() API

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Unline k_thread_spawn(), the struct k_thread can live anywhere and not
in the thread's stack region. This will be useful for memory protection
scenarios where private kernel structures for a thread are not
accessible by that thread, or we want to allow the thread to use all the
stack space we gave it.

This requires a change to the internal _new_thread() API as we need to
provide a separate pointer for the k_thread.

By default, we still create internal threads with the k_thread in stack
memory. Forthcoming patches will change this, but we first need to make
it easier to define k_thread memory of variable size depending on
whether we need to store coprocessor state or not.

Change-Id: I533bbcf317833ba67a771b356b6bbc6596bf60f5
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-03-30 13:07:02 -07:00 • committed by Anas Nashif
commit d26cf2dc33
16 changed files with 147 additions and 100 deletions
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17
kernel/include/kernel_structs.h
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@ -142,20 +142,19 @@ extern void _init_thread_base(struct _thread_base *thread_base,
int priority, u32_t initial_state,
unsigned int options);
static ALWAYS_INLINE struct k_thread *_new_thread_init(char *pStack,
size_t stackSize,
int prio,
unsigned int options)
static ALWAYS_INLINE void _new_thread_init(struct k_thread *thread,
char *pStack, size_t stackSize,
int prio, unsigned int options)
{
struct k_thread *thread;
#if !defined(CONFIG_INIT_STACKS) && !defined(CONFIG_THREAD_STACK_INFO)
ARG_UNUSED(pStack);
ARG_UNUSED(stackSize);
#endif
#ifdef CONFIG_INIT_STACKS
memset(pStack, 0xaa, stackSize);
#endif
/* Initialize various struct k_thread members */
thread = (struct k_thread *)pStack;
_init_thread_base(&thread->base, prio, _THREAD_PRESTART, options);
/* static threads overwrite it afterwards with real value */
@ -171,8 +170,6 @@ static ALWAYS_INLINE struct k_thread *_new_thread_init(char *pStack,
thread->stack_info.start = (u32_t)pStack;
thread->stack_info.size = (u32_t)stackSize;
#endif /* CONFIG_THREAD_STACK_INFO */
return thread;
}
#if defined(CONFIG_THREAD_MONITOR)