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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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5
arch/arm/core/thread.c
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@ -49,7 +49,7 @@
* @return N/A
*/
void _new_thread(char *pStackMem, size_t stackSize,
void _new_thread(struct k_thread *thread, char *pStackMem, size_t stackSize,
_thread_entry_t pEntry,
void *parameter1, void *parameter2, void *parameter3,
int priority, unsigned int options)
@ -62,9 +62,8 @@ void _new_thread(char *pStackMem, size_t stackSize,
char *stackEnd = pStackMem + stackSize;
struct __esf *pInitCtx;
struct k_thread *thread = (struct k_thread *) pStackMem;
thread = _new_thread_init(pStackMem, stackSize, priority, options);
_new_thread_init(thread, pStackMem, stackSize, priority, options);
/* carve the thread entry struct from the "base" of the stack */