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sched/sched: Add sched_get_stackinfo()

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The new OS interface, sched_get_stackinfo() combines two pthread-specific interfaces into a single generic interface.  The existing pthread_get_stackaddr_np() and pthread_get_stacksize_np() are moved from sched/pthread to libs/libc/pthread.

There are two motivations for this change:  First, it reduces the number of system calls.  Secondly, it adds a common hook that is going to used for a future implementation of TLS.
This commit is contained in:
Gregory Nutt 2020-05-03 14:16:36 -06:00 • committed by Abdelatif Guettouche
parent f03ed73f91
commit 00933cfece
11 changed files with 186 additions and 123 deletions
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35
include/nuttx/sched.h
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@ -382,6 +382,21 @@ struct dspace_s
};
#endif
/* struct stackinfo_s ***********************************************************/
/* Used to report stack information */
struct stackinfo_s
{
size_t adj_stack_size; /* Stack size after adjustment */
/* for hardware, processor, etc. */
/* (for debug purposes only) */
FAR void *stack_alloc_ptr; /* Pointer to allocated stack */
/* Needed to deallocate stack */
FAR void *adj_stack_ptr; /* Adjusted stack_alloc_ptr for HW */
/* The initial stack pointer value */
};
/* struct task_group_s **********************************************************/
/* All threads created by pthread_create belong in the same task group (along
@ -650,7 +665,7 @@ struct tcb_s
/* for hardware, processor, etc. */
/* (for debug purposes only) */
FAR void *stack_alloc_ptr; /* Pointer to allocated stack */
/* Need to deallocate stack */
/* Needed to deallocate stack */
FAR void *adj_stack_ptr; /* Adjusted stack_alloc_ptr for HW */
/* The initial stack pointer value */
@ -1223,6 +1238,24 @@ int nxsched_setaffinity(pid_t pid, size_t cpusetsize,
FAR const cpu_set_t *mask);
#endif
/********************************************************************************
* Name: sched_get_stackinfo
*
* Description:
* Report information about a thread's stack allocation.
*
* Input Parameters:
* pid_t - Identifies the thread to query. Zero is interpreted as the
* the calling thread
* stackinfo - User-provided location to return the stack information.
*
* Returned Value:
* Zero (OK) if successful. Otherwise, a negated errno value is returned.
*
********************************************************************************/
int sched_get_stackinfo(pid_t pid, FAR struct stackinfo_s *stackinfo);
#undef EXTERN
#if defined(__cplusplus)
}