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nuttx/include/nuttx/sched.h
wangbowen6 d77b53957c sched/env: add tg_envc in task_group_s to avoid some loops in code 
this commit optimize the env api speed

Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>
2023-02-25 23:10:37 +02:00

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/****************************************************************************
* include/nuttx/sched.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_SCHED_H
#define __INCLUDE_NUTTX_SCHED_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <sched.h>
#include <signal.h>
#include <pthread.h>
#include <time.h>
#include <nuttx/addrenv.h>
#include <nuttx/clock.h>
#include <nuttx/irq.h>
#include <nuttx/mutex.h>
#include <nuttx/semaphore.h>
#include <nuttx/queue.h>
#include <nuttx/wdog.h>
#include <nuttx/fs/fs.h>
#include <nuttx/net/net.h>
#include <nuttx/mm/map.h>
#include <arch/arch.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* We need to track group members at least for:
*
* - To signal all tasks in a group. (eg. SIGCHLD)
* - _exit() to collect siblings threads.
*/
#undef HAVE_GROUP_MEMBERS
#if !defined(CONFIG_DISABLE_PTHREAD)
# define HAVE_GROUP_MEMBERS 1
#endif
/* Sporadic scheduling */
#ifndef CONFIG_SCHED_SPORADIC_MAXREPL
# define CONFIG_SCHED_SPORADIC_MAXREPL 3
#endif
/* Task Management Definitions **********************************************/
/* Special task IDS. Any negative PID is invalid. */
#define IDLE_PROCESS_ID (pid_t)0
#define INVALID_PROCESS_ID (pid_t)-1
/* This is the maximum number of times that a lock can be set */
#define MAX_LOCK_COUNT 127
/* Values for the struct tcb_s flags bits */
#define TCB_FLAG_TTYPE_SHIFT (0) /* Bits 0-1: thread type */
#define TCB_FLAG_TTYPE_MASK (3 << TCB_FLAG_TTYPE_SHIFT)
# define TCB_FLAG_TTYPE_TASK (0 << TCB_FLAG_TTYPE_SHIFT) /* Normal user task */
# define TCB_FLAG_TTYPE_PTHREAD (1 << TCB_FLAG_TTYPE_SHIFT) /* User pthread */
# define TCB_FLAG_TTYPE_KERNEL (2 << TCB_FLAG_TTYPE_SHIFT) /* Kernel thread */
#define TCB_FLAG_NONCANCELABLE (1 << 2) /* Bit 2: Pthread is non-cancelable */
#define TCB_FLAG_CANCEL_DEFERRED (1 << 3) /* Bit 3: Deferred (vs asynch) cancellation type */
#define TCB_FLAG_CANCEL_PENDING (1 << 4) /* Bit 4: Pthread cancel is pending */
#define TCB_FLAG_POLICY_SHIFT (5) /* Bit 5-6: Scheduling policy */
#define TCB_FLAG_POLICY_MASK (3 << TCB_FLAG_POLICY_SHIFT)
# define TCB_FLAG_SCHED_FIFO (0 << TCB_FLAG_POLICY_SHIFT) /* FIFO scheding policy */
# define TCB_FLAG_SCHED_RR (1 << TCB_FLAG_POLICY_SHIFT) /* Round robin scheding policy */
# define TCB_FLAG_SCHED_SPORADIC (2 << TCB_FLAG_POLICY_SHIFT) /* Sporadic scheding policy */
#define TCB_FLAG_CPU_LOCKED (1 << 8) /* Bit 7: Locked to this CPU */
#define TCB_FLAG_SIGNAL_ACTION (1 << 9) /* Bit 8: In a signal handler */
#define TCB_FLAG_SYSCALL (1 << 10) /* Bit 9: In a system call */
#define TCB_FLAG_EXIT_PROCESSING (1 << 11) /* Bit 10: Exitting */
#define TCB_FLAG_FREE_STACK (1 << 12) /* Bit 12: Free stack after exit */
#define TCB_FLAG_HEAP_CHECK (1 << 13) /* Bit 13: Heap check */
#define TCB_FLAG_HEAP_DUMP (1 << 14) /* Bit 14: Heap dump */
#define TCB_FLAG_DETACHED (1 << 15) /* Bit 15: Pthread detached */
/* Values for struct task_group tg_flags */
#define GROUP_FLAG_NOCLDWAIT (1 << 0) /* Bit 0: Do not retain child exit status */
#define GROUP_FLAG_PRIVILEGED (1 << 1) /* Bit 1: Group is privileged */
#define GROUP_FLAG_DELETED (1 << 2) /* Bit 2: Group has been deleted but not yet freed */
#define GROUP_FLAG_EXITING (1 << 3) /* Bit 3: Group exit is in progress */
/* Bits 3-7: Available */
/* Values for struct child_status_s ch_flags */
#define CHILD_FLAG_TTYPE_SHIFT (0) /* Bits 0-1: child thread type */
#define CHILD_FLAG_TTYPE_MASK (3 << CHILD_FLAG_TTYPE_SHIFT)
# define CHILD_FLAG_TTYPE_TASK (0 << CHILD_FLAG_TTYPE_SHIFT) /* Normal user task */
# define CHILD_FLAG_TTYPE_PTHREAD (1 << CHILD_FLAG_TTYPE_SHIFT) /* User pthread */
# define CHILD_FLAG_TTYPE_KERNEL (2 << CHILD_FLAG_TTYPE_SHIFT) /* Kernel thread */
#define CHILD_FLAG_EXITED (1 << 2) /* Bit 2: The child thread has exit'ed */
/* Bits 3-7: Available */
/* Sporadic scheduler flags */
#define SPORADIC_FLAG_ALLOCED (1 << 0) /* Bit 0: Timer is allocated */
#define SPORADIC_FLAG_MAIN (1 << 1) /* Bit 1: The main timer */
#define SPORADIC_FLAG_REPLENISH (1 << 2) /* Bit 2: Replenishment cycle */
/* Bits 3-7: Available */
/* Most internal nxsched_* interfaces are not available in the user space in
* PROTECTED and KERNEL builds. In that context, the application semaphore
* interfaces must be used. The differences between the two sets of
* interfaces are: (1) the nxsched_* interfaces do not cause cancellation
* points and (2) they do not modify the errno variable.
*
* This is only important when compiling libraries (libc or libnx) that are
* used both by the OS (libkc.a and libknx.a) or by the applications
* (libc.a and libnx.a). In that case, the correct interface must be
* used for the build context.
*
* REVISIT: In the flat build, the same functions must be used both by
* the OS and by applications. We have to use the normal user functions
* in this case or we will fail to set the errno or fail to create the
* cancellation point.
*/
#if !defined(CONFIG_BUILD_FLAT) && defined(__KERNEL__)
# define _SCHED_GETPARAM(t,p) nxsched_get_param(t,p)
# define _SCHED_SETPARAM(t,p) nxsched_set_param(t,p)
# define _SCHED_GETSCHEDULER(t) nxsched_get_scheduler(t)
# define _SCHED_SETSCHEDULER(t,s,p) nxsched_set_scheduler(t,s,p)
# define _SCHED_GETAFFINITY(t,c,m) nxsched_get_affinity(t,c,m)
# define _SCHED_SETAFFINITY(t,c,m) nxsched_set_affinity(t,c,m)
# define _SCHED_ERRNO(r) (-(r))
# define _SCHED_ERRVAL(r) (r)
#else
# define _SCHED_GETPARAM(t,p) sched_getparam(t,p)
# define _SCHED_SETPARAM(t,p) sched_setparam(t,p)
# define _SCHED_GETSCHEDULER(t) sched_getscheduler(t)
# define _SCHED_SETSCHEDULER(t,s,p) sched_setscheduler(t,s,p)
# define _SCHED_GETAFFINITY(t,c,m) sched_getaffinity(t,c,m)
# define _SCHED_SETAFFINITY(t,c,m) sched_setaffinity(t,c,m)
# define _SCHED_ERRNO(r) errno
# define _SCHED_ERRVAL(r) (-errno)
#endif
#if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
# define _SCHED_GETTID() nxsched_gettid()
# define _SCHED_GETPID() nxsched_getpid()
# define _SCHED_GETPPID() nxsched_getppid()
#else
# define _SCHED_GETTID() gettid()
# define _SCHED_GETPID() getpid()
# define _SCHED_GETPPID() getppid()
#endif
#ifdef CONFIG_DEBUG_TCBINFO
# define TCB_PID_OFF offsetof(struct tcb_s, pid)
# define TCB_STATE_OFF offsetof(struct tcb_s, task_state)
# define TCB_PRI_OFF offsetof(struct tcb_s, sched_priority)
#if CONFIG_TASK_NAME_SIZE > 0
# define TCB_NAME_OFF offsetof(struct tcb_s, name)
#else
# define TCB_NAME_OFF 0
#endif
# define TCB_REGS_OFF offsetof(struct tcb_s, xcp.regs)
# define TCB_REG_OFF(reg) (reg * sizeof(uint32_t))
#endif
/* Get a pointer to the process' memory map struct from the task_group */
#define get_group_mm(group) (group ? &group->tg_mm_map : NULL)
/* Get a pointer to current the process' memory map struct */
#define get_current_mm() (get_group_mm(nxsched_self()->group))
/****************************************************************************
* Public Type Definitions
****************************************************************************/
#ifndef __ASSEMBLY__
/* General Task Management Types ********************************************/
/* This is the type of the task_state field of the TCB. NOTE: the order and
* content of this enumeration is critical since there are some OS tables
* indexed by these values.
* The range of values is assumed to fit into a uint8_t in struct tcb_s.
*/
enum tstate_e
{
TSTATE_TASK_INVALID = 0, /* INVALID - The TCB is uninitialized */
TSTATE_TASK_PENDING, /* READY_TO_RUN - Pending preemption unlock */
TSTATE_TASK_READYTORUN, /* READY-TO-RUN - But not running */
#ifdef CONFIG_SMP
TSTATE_TASK_ASSIGNED, /* READY-TO-RUN - Not running, but assigned to a CPU */
#endif
TSTATE_TASK_RUNNING, /* READY_TO_RUN - And running */
TSTATE_TASK_INACTIVE, /* BLOCKED - Initialized but not yet activated */
TSTATE_WAIT_SEM, /* BLOCKED - Waiting for a semaphore */
TSTATE_WAIT_SIG, /* BLOCKED - Waiting for a signal */
#if !defined(CONFIG_DISABLE_MQUEUE) || !defined(CONFIG_DISABLE_MQUEUE_SYSV)
TSTATE_WAIT_MQNOTEMPTY, /* BLOCKED - Waiting for a MQ to become not empty. */
TSTATE_WAIT_MQNOTFULL, /* BLOCKED - Waiting for a MQ to become not full. */
#endif
#ifdef CONFIG_PAGING
TSTATE_WAIT_PAGEFILL, /* BLOCKED - Waiting for page fill */
#endif
#ifdef CONFIG_SIG_SIGSTOP_ACTION
TSTATE_TASK_STOPPED, /* BLOCKED - Waiting for SIGCONT */
#endif
NUM_TASK_STATES /* Must be last */
};
typedef enum tstate_e tstate_t;
/* The following definitions are determined by tstate_t. Ordering of values
* in the enumeration is important!
*/
#define FIRST_READY_TO_RUN_STATE TSTATE_TASK_READYTORUN
#define LAST_READY_TO_RUN_STATE TSTATE_TASK_RUNNING
#define FIRST_ASSIGNED_STATE TSTATE_TASK_ASSIGNED
#define LAST_ASSIGNED_STATE TSTATE_TASK_RUNNING
#define FIRST_BLOCKED_STATE TSTATE_TASK_INACTIVE
#define LAST_BLOCKED_STATE (NUM_TASK_STATES-1)
/* The following is the form of a thread start-up function */
typedef CODE void (*start_t)(void);
/* This is the entry point into the main thread of the task or into a created
* pthread within the task.
*/
union entry_u
{
pthread_startroutine_t pthread;
main_t main;
};
typedef union entry_u entry_t;
/* This is the type of the function called at task startup */
#ifdef CONFIG_SCHED_STARTHOOK
typedef CODE void (*starthook_t)(FAR void *arg);
#endif
/* struct sporadic_s ********************************************************/
#ifdef CONFIG_SCHED_SPORADIC
/* This structure represents one replenishment interval. This is what is
* received by each timeout handler.
*/
struct sporadic_s;
struct replenishment_s
{
FAR struct tcb_s *tcb; /* The parent TCB structure */
struct wdog_s timer; /* Timer dedicated to this interval */
uint32_t budget; /* Current budget time */
uint8_t flags; /* See SPORADIC_FLAG_* definitions */
};
/* This structure is an allocated "plug-in" to the main TCB structure. It is
* allocated when the sporadic scheduling policy is assigned to a thread.
* Thus, in the context of numerous threads of varying policies, there the
* overhead from this significant allocation is only borne by the threads
* with the sporadic scheduling policy.
*/
struct sporadic_s
{
bool suspended; /* Thread is currently suspended */
uint8_t hi_priority; /* Sporadic high priority */
uint8_t low_priority; /* Sporadic low priority */
uint8_t max_repl; /* Maximum number of replenishments */
uint8_t nrepls; /* Number of active replenishments */
uint32_t repl_period; /* Sporadic replenishment period */
uint32_t budget; /* Sporadic execution budget period */
clock_t eventtime; /* Time thread suspended or [re-]started */
/* This is the last interval timer activated */
FAR struct replenishment_s *active;
/* This is the list of replenishment interval timers */
struct replenishment_s replenishments[CONFIG_SCHED_SPORADIC_MAXREPL];
};
#endif /* CONFIG_SCHED_SPORADIC */
/* struct child_status_s ****************************************************/
/* This structure is used to maintain information about child tasks.
* pthreads work differently, they have join information.
* This is only for child tasks.
*/
#ifdef CONFIG_SCHED_CHILD_STATUS
struct child_status_s
{
FAR struct child_status_s *flink;
uint8_t ch_flags; /* Child status: See CHILD_FLAG_* defns */
pid_t ch_pid; /* Child task ID */
int ch_status; /* Child exit status */
};
#endif
/* struct dspace_s **********************************************************/
/* This structure describes a reference counted D-Space region.
* This must be a separately allocated "break-away" structure that
* can be owned by a task and any pthreads created by the task.
*/
#ifdef CONFIG_PIC
struct dspace_s
{
/* The life of the structure allocation is determined by this reference
* count. This count is number of threads that shared the same D-Space.
* This includes the parent task as well as any pthreads created by the
* parent task or any of its child threads.
*/
uint16_t crefs;
/* This is the allocated D-Space memory region. This may be a physical
* address allocated with kmm_malloc(), or it may be virtual address
* associated with an address environment (if CONFIG_ARCH_ADDRENV=y).
*/
FAR uint8_t *region;
};
#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 *stack_base_ptr; /* Adjusted initial stack pointer */
/* after the frame has been removed */
/* from the stack. */
};
/* struct task_group_s ******************************************************/
/* All threads created by pthread_create belong in the same task group (along
* with the thread of the original task). struct task_group_s is a shared
* structure referenced by the TCB of each thread that is a member of the
* task group.
*
* This structure should contain *all* resources shared by tasks and threads
* that belong to the same task group:
*
* Child exit status
* Environment variables
* PIC data space and address environments
* File descriptors
* FILE streams
* Sockets
* Address environments.
*
* Each instance of struct task_group_s is reference counted. Each instance
* is created with a reference count of one. The reference incremented when
* each thread joins the group and decremented when each thread exits,
* leaving the group. When the reference count decrements to zero,
* the struct task_group_s is free.
*/
struct task_info_s;
#ifndef CONFIG_DISABLE_PTHREAD
struct join_s; /* Forward reference */
/* Defined in sched/pthread/pthread.h */
#endif
#ifdef CONFIG_BINFMT_LOADABLE
struct binary_s; /* Forward reference */
/* Defined in include/nuttx/binfmt/binfmt.h */
#endif
struct task_group_s
{
#if defined(HAVE_GROUP_MEMBERS)
struct task_group_s *flink; /* Supports a singly linked list */
#endif
pid_t tg_pid; /* The ID of the task within the group */
pid_t tg_ppid; /* This is the ID of the parent thread */
uint8_t tg_flags; /* See GROUP_FLAG_* definitions */
/* User identity **********************************************************/
#ifdef CONFIG_SCHED_USER_IDENTITY
uid_t tg_uid; /* User identity */
gid_t tg_gid; /* User group identity */
#endif
/* Group membership *******************************************************/
uint8_t tg_nmembers; /* Number of members in the group */
#ifdef HAVE_GROUP_MEMBERS
uint8_t tg_mxmembers; /* Number of members in allocation */
FAR pid_t *tg_members; /* Members of the group */
#endif
#ifdef CONFIG_BINFMT_LOADABLE
/* Loadable module support ************************************************/
FAR struct binary_s *tg_bininfo; /* Describes resources used by program */
#endif
#ifdef CONFIG_SCHED_HAVE_PARENT
/* Child exit status ******************************************************/
#ifdef CONFIG_SCHED_CHILD_STATUS
FAR struct child_status_s *tg_children; /* Head of a list of child status */
#else
uint16_t tg_nchildren; /* This is the number active children */
#endif
/* Group exit status ******************************************************/
int tg_exitcode; /* Exit code (status) for group */
#endif /* CONFIG_SCHED_HAVE_PARENT */
#if defined(CONFIG_SCHED_WAITPID) && !defined(CONFIG_SCHED_HAVE_PARENT)
/* waitpid support ********************************************************/
/* Simple mechanism used only when there is no support for SIGCHLD */
uint8_t tg_nwaiters; /* Number of waiters */
uint8_t tg_waitflags; /* User flags for waitpid behavior */
sem_t tg_exitsem; /* Support for waitpid */
FAR int *tg_statloc; /* Location to return exit status */
#endif
#ifndef CONFIG_DISABLE_PTHREAD
/* Pthreads ***************************************************************/
/* Pthread join Info: */
mutex_t tg_joinlock; /* Mutually exclusive access to join data */
FAR struct join_s *tg_joinhead; /* Head of a list of join data */
FAR struct join_s *tg_jointail; /* Tail of a list of join data */
#endif
/* Thread local storage ***************************************************/
FAR struct task_info_s *tg_info;
/* POSIX Signal Control Fields ********************************************/
sq_queue_t tg_sigactionq; /* List of actions for signals */
sq_queue_t tg_sigpendingq; /* List of pending signals */
#ifdef CONFIG_SIG_DEFAULT
sigset_t tg_sigdefault; /* Set of signals set to the default action */
#endif
#ifndef CONFIG_DISABLE_ENVIRON
/* Environment variables **************************************************/
FAR char **tg_envp; /* Allocated environment strings */
ssize_t tg_envc; /* Number of environment strings */
#endif
#ifndef CONFIG_DISABLE_POSIX_TIMERS
/* Interval timer *********************************************************/
timer_t itimer;
#endif
/* PIC data space and address environments ********************************/
/* Logically the PIC data space belongs here (see struct dspace_s). The
* current logic needs review: There are differences in the away that the
* life of the PIC data is managed.
*/
/* File descriptors *******************************************************/
struct filelist tg_filelist; /* Maps file descriptor to file */
/* Virtual memory mapping info ********************************************/
struct mm_map_s tg_mm_map; /* Task mmappings */
};
/* struct tcb_s *************************************************************/
/* This is the common part of the task control block (TCB).
* The TCB is the heart of the NuttX task-control logic.
* Each task or thread is represented by a TCB that includes these common
* definitions.
*/
struct tcb_s
{
/* Fields used to support list management *********************************/
FAR struct tcb_s *flink; /* Doubly linked list */
FAR struct tcb_s *blink;
/* Task Group *************************************************************/
FAR struct task_group_s *group; /* Pointer to shared task group data */
/* Address Environment ****************************************************/
#ifdef CONFIG_ARCH_ADDRENV
FAR struct addrenv_s *addrenv_own; /* Task (group) own memory mappings */
FAR struct addrenv_s *addrenv_curr; /* Current active memory mappings */
#endif
/* Task Management Fields *************************************************/
pid_t pid; /* This is the ID of the thread */
uint8_t sched_priority; /* Current priority of the thread */
uint8_t init_priority; /* Initial priority of the thread */
start_t start; /* Thread start function */
entry_t entry; /* Entry Point into the thread */
uint8_t task_state; /* Current state of the thread */
#ifdef CONFIG_PRIORITY_INHERITANCE
uint8_t boost_priority; /* "Boosted" priority of the thread */
uint8_t base_priority; /* "Normal" priority of the thread */
FAR struct semholder_s *holdsem; /* List of held semaphores */
#endif
#ifdef CONFIG_SMP
uint8_t cpu; /* CPU index if running/assigned */
cpu_set_t affinity; /* Bit set of permitted CPUs */
#endif
uint16_t flags; /* Misc. general status flags */
int16_t lockcount; /* 0=preemptible (not-locked) */
#ifdef CONFIG_IRQCOUNT
int16_t irqcount; /* 0=Not in critical section */
#endif
#ifdef CONFIG_CANCELLATION_POINTS
int16_t cpcount; /* Nested cancellation point count */
#endif
int16_t errcode; /* Used to pass error information */
#if CONFIG_RR_INTERVAL > 0 || defined(CONFIG_SCHED_SPORADIC)
int32_t timeslice; /* RR timeslice OR Sporadic budget */
/* interval remaining */
#endif
#ifdef CONFIG_SCHED_SPORADIC
FAR struct sporadic_s *sporadic; /* Sporadic scheduling parameters */
#endif
struct wdog_s waitdog; /* All timed waits use this timer */
/* Stack-Related Fields ***************************************************/
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 *stack_base_ptr; /* Adjusted initial stack pointer */
/* after the frame has been */
/* removed from the stack. */
/* External Module Support ************************************************/
#ifdef CONFIG_PIC
FAR struct dspace_s *dspace; /* Allocated area for .bss and .data */
#endif
/* POSIX Semaphore and Message Queue Control Fields ***********************/
FAR void *waitobj; /* Object thread waiting on */
/* POSIX Signal Control Fields ********************************************/
sigset_t sigprocmask; /* Signals that are blocked */
sigset_t sigwaitmask; /* Waiting for pending signals */
sq_queue_t sigpendactionq; /* List of pending signal actions */
sq_queue_t sigpostedq; /* List of posted signals */
siginfo_t sigunbinfo; /* Signal info when task unblocked */
/* Robust mutex support ***************************************************/
#if !defined(CONFIG_DISABLE_PTHREAD) && !defined(CONFIG_PTHREAD_MUTEX_UNSAFE)
FAR struct pthread_mutex_s *mhead; /* List of mutexes held by thread */
#endif
/* CPU load monitoring support ********************************************/
#ifdef CONFIG_SCHED_CPULOAD
uint32_t ticks; /* Number of ticks on this thread */
#endif
/* Pre-emption monitor support ********************************************/
#ifdef CONFIG_SCHED_CRITMONITOR
uint32_t premp_start; /* Time when preemption disabled */
uint32_t premp_max; /* Max time preemption disabled */
uint32_t crit_start; /* Time critical section entered */
uint32_t crit_max; /* Max time in critical section */
uint32_t run_start; /* Time when thread begin run */
uint32_t run_max; /* Max time thread run */
#endif
/* State save areas *******************************************************/
/* The form and content of these fields are platform-specific. */
struct xcptcontext xcp; /* Interrupt register save area */
#if CONFIG_TASK_NAME_SIZE > 0
char name[CONFIG_TASK_NAME_SIZE + 1]; /* Task name (with NUL terminator */
#endif
};
/* struct task_tcb_s ********************************************************/
/* This is the particular form of the task control block (TCB) structure used
* by tasks (and kernel threads). There are two TCB forms: one for pthreads
* and one for tasks.
* Both share the common TCB fields (which must appear at the top of the
* structure) plus additional fields unique to tasks and threads.
* Having separate structures for tasks and pthreads adds some complexity,
* but saves memory in that it prevents pthreads from being burdened with the
* overhead required for tasks (and vice versa).
*/
struct task_tcb_s
{
/* Common TCB fields ******************************************************/
struct tcb_s cmn; /* Common TCB fields */
/* Task Management Fields *************************************************/
#ifdef CONFIG_SCHED_STARTHOOK
starthook_t starthook; /* Task startup function */
FAR void *starthookarg; /* The argument passed to the function */
#endif
};
/* struct pthread_tcb_s *****************************************************/
/* This is the particular form of the task control block (TCB) structure used
* by pthreads. There are two TCB forms: one for pthreads and one for tasks.
* Both share the common TCB fields (which must appear at the top of the
* structure) plus additional fields unique to tasks and threads.
* Having separate structures for tasks and pthreads adds some complexity,
* but saves memory in that it prevents pthreads from being burdened with
* the overhead required for tasks (and vice versa).
*/
#ifndef CONFIG_DISABLE_PTHREAD
struct pthread_tcb_s
{
/* Common TCB fields ******************************************************/
struct tcb_s cmn; /* Common TCB fields */
/* Task Management Fields *************************************************/
pthread_trampoline_t trampoline; /* User-space pthread startup function */
pthread_addr_t arg; /* Startup argument */
FAR void *joininfo; /* Detach-able info to support join */
};
#endif /* !CONFIG_DISABLE_PTHREAD */
/* struct tcbinfo_s *********************************************************/
/* The structure save key filed offset of tcb_s while can be used by
* debuggers to parse the tcb information
*/
#ifdef CONFIG_DEBUG_TCBINFO
begin_packed_struct struct tcbinfo_s
{
uint16_t pid_off; /* Offset of tcb.pid */
uint16_t state_off; /* Offset of tcb.task_state */
uint16_t pri_off; /* Offset of tcb.sched_priority */
uint16_t name_off; /* Offset of tcb.name */
uint16_t regs_off; /* Offset of tcb.regs */
uint16_t basic_num; /* Num of genernal regs */
uint16_t total_num; /* Num of regs in tcbinfo.reg_offs */
/* Offset pointer of xcp.regs, order in GDB org.gnu.gdb.xxx feature.
* Please refer:
* https://sourceware.org/gdb/current/onlinedocs/gdb/ARM-Features.html
* https://sourceware.org/gdb/current/onlinedocs/gdb/RISC_002dV-Features
* -.html
* value UINT16_MAX: This regsiter was not priovided by NuttX
*/
begin_packed_struct
union
{
uint8_t u[8];
FAR const uint16_t *p;
}
end_packed_struct reg_off;
} end_packed_struct;
#endif
/* This is the callback type used by nxsched_foreach() */
typedef CODE void (*nxsched_foreach_t)(FAR struct tcb_s *tcb, FAR void *arg);
#endif /* __ASSEMBLY__ */
/****************************************************************************
* Public Data
****************************************************************************/
#ifndef __ASSEMBLY__
#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
#ifdef CONFIG_SCHED_CRITMONITOR
/* Maximum time with pre-emption disabled or within critical section. */
EXTERN uint32_t g_premp_max[CONFIG_SMP_NCPUS];
EXTERN uint32_t g_crit_max[CONFIG_SMP_NCPUS];
#endif /* CONFIG_SCHED_CRITMONITOR */
#ifdef CONFIG_DEBUG_TCBINFO
EXTERN const struct tcbinfo_s g_tcbinfo;
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: nxsched_self
*
* Description:
* Return the current threads TCB. Basically, this function just wraps the
* head of the ready-to-run list and manages access to the TCB from outside
* of the sched/ sub-directory.
*
****************************************************************************/
FAR struct tcb_s *nxsched_self(void);
/****************************************************************************
* Name: nxsched_foreach
*
* Description:
* Enumerate over each task and provide the TCB of each task to a user
* callback functions.
*
* NOTE: This function examines the TCB and calls each handler within a
* critical section. However, that critical section is released and
* reacquired for each TCB. When it is released, there may be changes in
* tasking. If the caller requires absolute stability through the
* traversal, then the caller should establish the critical section BEFORE
* calling this function.
*
* Input Parameters:
* handler - The function to be called with the TCB of
* each task
*
* Returned Value:
* None
*
****************************************************************************/
void nxsched_foreach(nxsched_foreach_t handler, FAR void *arg);
/****************************************************************************
* Name: nxsched_get_tcb
*
* Description:
* Given a task ID, this function will return the a pointer to the
* corresponding TCB (or NULL if there is no such task ID).
*
* NOTE: This function holds a critical section while examining TCB data
* data structures but releases that critical section before returning.
* When it is released, the TCB may become unstable. If the caller
* requires absolute stability while using the TCB, then the caller
* should establish the critical section BEFORE calling this function and
* hold that critical section as long as necessary.
*
****************************************************************************/
FAR struct tcb_s *nxsched_get_tcb(pid_t pid);
/****************************************************************************
* Name: nxsched_releasepid
*
* Description:
* When a task is destroyed, this function must be called to make its
* process ID available for re-use.
*
****************************************************************************/
int nxsched_release_tcb(FAR struct tcb_s *tcb, uint8_t ttype);
/* File system helpers ******************************************************/
/* These functions all extract lists from the group structure associated with
* the currently executing task.
*/
FAR struct filelist *nxsched_get_files(void);
/****************************************************************************
* Name: nxtask_init
*
* Description:
* This function initializes a Task Control Block (TCB) in preparation for
* starting a new thread. It performs a subset of the functionality of
* task_create()
*
* Unlike task_create():
* 1. Allocate the TCB. The pre-allocated TCB is passed in argv.
* 2. Allocate the stack. The pre-allocated stack is passed in argv.
* 3. Activate the task. This must be done by calling nxtask_activate().
*
* Certain fields of the pre-allocated TCB may be set to change the
* nature of the created task. For example:
*
* - Task type may be set in the TCB flags to create kernel thread
*
* Input Parameters:
* tcb - Address of the new task's TCB
* name - Name of the new task (not used)
* priority - Priority of the new task
* stack - Start of the pre-allocated stack
* stack_size - Size (in bytes) of the stack allocated
* entry - Application start point of the new task
* argv - A pointer to an array of input parameters. The array
* should be terminated with a NULL argv[] value. If no
* parameters are required, argv may be NULL.
* envp - A pointer to the program's environment, envp may be NULL
*
* Returned Value:
* OK on success; negative error value on failure appropriately. (See
* nxtask_setup_scheduler() for possible failure conditions). On failure,
* the caller is responsible for freeing the stack memory and for calling
* nxsched_release_tcb() to free the TCB (which could be in most any
* state).
*
****************************************************************************/
int nxtask_init(FAR struct task_tcb_s *tcb, const char *name, int priority,
FAR void *stack, uint32_t stack_size, main_t entry,
FAR char * const argv[], FAR char * const envp[]);
/****************************************************************************
* Name: nxtask_uninit
*
* Description:
* Undo all operations on a TCB performed by task_init() and release the
* TCB by calling kmm_free(). This is intended primarily to support
* error recovery operations after a successful call to task_init() such
* was when a subsequent call to task_activate fails.
*
* Caution: Freeing of the TCB itself might be an unexpected side-effect.
*
* Input Parameters:
* tcb - Address of the TCB initialized by task_init()
*
* Returned Value:
* OK on success; negative error value on failure appropriately.
*
****************************************************************************/
void nxtask_uninit(FAR struct task_tcb_s *tcb);
/****************************************************************************
* Name: nxtask_create
*
* Description:
* This function creates and activates a new user task with a specified
* priority and returns its system-assigned ID.
*
* The entry address entry is the address of the "main" function of the
* task. This function will be called once the C environment has been
* set up. The specified function will be called with four arguments.
* Should the specified routine return, a call to exit() will
* automatically be made.
*
* Note that four (and only four) arguments must be passed for the spawned
* functions.
*
* nxtask_create() is identical to the function task_create(), differing
* only in its return value: This function does not modify the errno
* variable. This is a non-standard, internal OS function and is not
* intended for use by application logic. Applications should use
* task_create().
*
* Input Parameters:
* name - Name of the new task
* priority - Priority of the new task
* stack_size - size (in bytes) of the stack needed
* entry - Entry point of a new task
* arg - A pointer to an array of input parameters. The array
* should be terminated with a NULL argv[] value. If no
* parameters are required, argv may be NULL.
* envp - A pointer to an array of environment strings. Terminated
* with a NULL entry.
*
* Returned Value:
* Returns the positive, non-zero process ID of the new task or a negated
* errno value to indicate the nature of any failure. If memory is
* insufficient or the task cannot be created -ENOMEM will be returned.
*
****************************************************************************/
int nxtask_create(FAR const char *name, int priority,
FAR void *stack_addr, int stack_size, main_t entry,
FAR char * const argv[], FAR char * const envp[]);
/****************************************************************************
* Name: nxtask_delete
*
* Description:
* This function causes a specified task to cease to exist. Its stack and
* TCB will be deallocated.
*
* The logic in this function only deletes non-running tasks. If the
* 'pid' parameter refers to the currently running task, then processing
* is redirected to exit(). This can only happen if a task calls
* nxtask_delete() in order to delete itself.
*
* This function obeys the semantics of pthread cancellation: task
* deletion is deferred if cancellation is disabled or if deferred
* cancellation is supported (with cancellation points enabled).
*
* Input Parameters:
* pid - The task ID of the task to delete. A pid of zero
* signifies the calling task.
*
* Returned Value:
* OK on success; or negated errno on failure
*
****************************************************************************/
int nxtask_delete(pid_t pid);
/****************************************************************************
* Name: nxtask_activate
*
* Description:
* This function activates tasks initialized by nxtask_setup_scheduler().
* Without activation, a task is ineligible for execution by the
* scheduler.
*
* Input Parameters:
* tcb - The TCB for the task (same as the nxtask_init argument).
*
* Returned Value:
* None
*
****************************************************************************/
void nxtask_activate(FAR struct tcb_s *tcb);
/****************************************************************************
* Name: nxtask_starthook
*
* Description:
* Configure a start hook... a function that will be called on the thread
* of the new task before the new task's main entry point is called.
* The start hook is useful, for example, for setting up automatic
* configuration of C++ constructors.
*
* Input Parameters:
* tcb - The new, unstarted task task that needs the start hook
* starthook - The pointer to the start hook function
* arg - The argument to pass to the start hook function.
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_SCHED_STARTHOOK
void nxtask_starthook(FAR struct task_tcb_s *tcb, starthook_t starthook,
FAR void *arg);
#endif
/****************************************************************************
* Name: nxtask_startup
*
* Description:
* This function is the user-space, task startup function. It is called
* from up_task_start() in user-mode.
*
* Input Parameters:
* entrypt - The user-space address of the task entry point
* argc and argv - Standard arguments for the task entry point
*
* Returned Value:
* None. This function does not return.
*
****************************************************************************/
#ifndef CONFIG_BUILD_KERNEL
void nxtask_startup(main_t entrypt, int argc, FAR char *argv[]);
#endif
/****************************************************************************
* Internal vfork support. The overall sequence is:
*
* 1) User code calls vfork(). vfork() is provided in architecture-specific
* code.
* 2) vfork()and calls nxtask_setup_vfork().
* 3) nxtask_setup_vfork() allocates and configures the child task's TCB.
* This consists of:
* - Allocation of the child task's TCB.
* - Initialization of file descriptors and streams
* - Configuration of environment variables
* - Allocate and initialize the stack
* - Setup the input parameters for the task.
* - Initialization of the TCB (including call to up_initial_state())
* 4) vfork() provides any additional operating context. vfork must:
* - Initialize special values in any CPU registers that were not
* already configured by up_initial_state()
* 5) vfork() then calls nxtask_start_vfork()
* 6) nxtask_start_vfork() then executes the child thread.
*
* nxtask_abort_vfork() may be called if an error occurs between
* steps 3 and 6.
*
****************************************************************************/
FAR struct task_tcb_s *nxtask_setup_vfork(start_t retaddr);
pid_t nxtask_start_vfork(FAR struct task_tcb_s *child);
void nxtask_abort_vfork(FAR struct task_tcb_s *child, int errcode);
/****************************************************************************
* Name: group_argvstr
*
* Description:
* Safely read the contents of a task's argument vector, into a a safe
* buffer. Function skips the process's name.
*
* Input Parameters:
* tcb - tcb of the task.
* args - Output buffer for the argument vector.
* size - Size of the buffer.
*
* Returned Value:
* The actual string length that was written.
*
****************************************************************************/
size_t group_argvstr(FAR struct tcb_s *tcb, FAR char *args, size_t size);
/****************************************************************************
* Name: group_exitinfo
*
* Description:
* This function may be called to when a task is loaded into memory. It
* will setup the to automatically unload the module when the task exits.
*
* Input Parameters:
* pid - The task ID of the newly loaded task
* bininfo - This structure allocated with kmm_malloc(). This memory
* persists until the task exits and will be used unloads
* the module from memory.
*
* Returned Value:
* This is a NuttX internal function so it follows the convention that
* 0 (OK) is returned on success and a negated errno is returned on
* failure.
*
****************************************************************************/
#ifdef CONFIG_BINFMT_LOADABLE
struct binary_s; /* Forward reference */
int group_exitinfo(pid_t pid, FAR struct binary_s *bininfo);
#endif
/****************************************************************************
* Name: nxsched_resume_scheduler
*
* Description:
* Called by architecture specific implementations that block task
* execution.
* This function prepares the scheduler for the thread that is about to be
* restarted.
*
* Input Parameters:
* tcb - The TCB of the thread to be restarted.
*
* Returned Value:
* None
*
****************************************************************************/
#if CONFIG_RR_INTERVAL > 0 || defined(CONFIG_SCHED_RESUMESCHEDULER)
void nxsched_resume_scheduler(FAR struct tcb_s *tcb);
#else
# define nxsched_resume_scheduler(tcb)
#endif
/****************************************************************************
* Name: nxsched_suspend_scheduler
*
* Description:
* Called by architecture specific implementations to resume task
* execution.
* This function performs scheduler operations for the thread that is about
* to be suspended.
*
* Input Parameters:
* tcb - The TCB of the thread to be restarted.
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef CONFIG_SCHED_SUSPENDSCHEDULER
void nxsched_suspend_scheduler(FAR struct tcb_s *tcb);
#else
# define nxsched_suspend_scheduler(tcb)
#endif
/****************************************************************************
* Name: nxsched_get_param
*
* Description:
* This function gets the scheduling priority of the task specified by
* pid. It is identical in function, differing only in its return value:
* This function does not modify the errno variable.
*
* This is a non-standard, internal OS function and is not intended for
* use by application logic. Applications should use the standard
* sched_getparam().
*
* Input Parameters:
* pid - the task ID of the task. If pid is zero, the priority
* of the calling task is returned.
* param - A structure whose member sched_priority is the integer
* priority. The task's priority is copied to the sched_priority
* element of this structure.
*
* Returned Value:
* 0 (OK) if successful, otherwise a negated errno value is returned to
* indicate the nature of the failure..
*
* This function can fail if param is null (EINVAL) or if pid does
* not correspond to any task (ESRCH).
*
****************************************************************************/
struct sched_param; /* Forward reference */
int nxsched_get_param (pid_t pid, FAR struct sched_param *param);
/****************************************************************************
* Name: nxsched_set_param
*
* Description:
* This function sets the priority of a specified task. It is identical
* to the function sched_setparam(), differing only in its return value:
* This function does not modify the errno variable.
*
* NOTE: Setting a task's priority to the same value has a similar effect
* to sched_yield() -- The task will be moved to after all other tasks
* with the same priority.
*
* This is a non-standard, internal OS function and is not intended for
* use by application logic. Applications should use the standard
* sched_setparam().
*
* Input Parameters:
* pid - the task ID of the task to reprioritize. If pid is zero, the
* priority of the calling task is changed.
* param - A structure whose member sched_priority is the integer priority.
* The range of valid priority numbers is from SCHED_PRIORITY_MIN
* through SCHED_PRIORITY_MAX.
*
* Returned Value:
* 0 (OK) if successful, otherwise a negated errno value is returned to
* indicate the nature of the failure..
*
* EINVAL The parameter 'param' is invalid or does not make sense for the
* current scheduling policy.
* EPERM The calling task does not have appropriate privileges.
* ESRCH The task whose ID is pid could not be found.
*
****************************************************************************/
struct sched_param; /* Forward reference */
int nxsched_set_param(pid_t pid, FAR const struct sched_param *param);
/****************************************************************************
* Name: nxsched_get_scheduler
*
* Description:
* sched_getscheduler() returns the scheduling policy currently
* applied to the task identified by pid. If pid equals zero, the
* policy of the calling task will be retrieved.
*
* This functions is identical to the function sched_getscheduler(),
* differing only in its return value: This function does not modify
* the errno variable.
*
* This is a non-standard, internal OS function and is not intended for
* use by application logic. Applications should use the standard
* sched_getscheduler().
*
* Input Parameters:
* pid - the task ID of the task to query. If pid is zero, the
* calling task is queried.
*
* Returned Value:
* On success, sched_getscheduler() returns the policy for the task
* (either SCHED_FIFO or SCHED_RR). On error, a negated errno value
* returned:
*
* ESRCH The task whose ID is pid could not be found.
*
****************************************************************************/
int nxsched_get_scheduler(pid_t pid);
/****************************************************************************
* Name: nxsched_set_scheduler
*
* Description:
* nxsched_set_scheduler() sets both the scheduling policy and the priority
* for the task identified by pid. If pid equals zero, the scheduler of
* the calling task will be set. The parameter 'param' holds the priority
* of the thread under the new policy.
*
* nxsched_set_scheduler() is identical to the function sched_getparam(),
* differing only in its return value: This function does not modify the
* errno variable.
*
* This is a non-standard, internal OS function and is not intended for
* use by application logic. Applications should use the standard
* sched_getparam().
*
* Input Parameters:
* pid - the task ID of the task to modify. If pid is zero, the calling
* task is modified.
* policy - Scheduling policy requested (either SCHED_FIFO or SCHED_RR)
* param - A structure whose member sched_priority is the new priority.
* The range of valid priority numbers is from SCHED_PRIORITY_MIN
* through SCHED_PRIORITY_MAX.
*
* Returned Value:
* On success, nxsched_set_scheduler() returns OK (zero). On error, a
* negated errno value is returned:
*
* EINVAL The scheduling policy is not one of the recognized policies.
* ESRCH The task whose ID is pid could not be found.
*
****************************************************************************/
int nxsched_set_scheduler(pid_t pid, int policy,
FAR const struct sched_param *param);
/****************************************************************************
* Name: nxsched_get_affinity
*
* Description:
* nxsched_get_affinity() writes the affinity mask of the thread whose ID
* is pid into the cpu_set_t pointed to by mask. The cpusetsize
* argument specifies the size (in bytes) of mask. If pid is zero, then
* the mask of the calling thread is returned.
*
* nxsched_get_affinity() is identical to the function sched_getaffinity(),
* differing only in its return value: This function does not modify the
* errno variable.
*
* This is a non-standard, internal OS function and is not intended for
* use by application logic. Applications should use the standard
* sched_getparam().
*
* Input Parameters:
* pid - The ID of thread whose affinity set will be retrieved.
* cpusetsize - Size of mask. MUST be sizeofcpu_set_t().
* mask - The location to return the thread's new affinity set.
*
* Returned Value:
* Zero (OK) if successful. Otherwise, a negated errno value is returned:
*
* ESRCH The task whose ID is pid could not be found.
*
****************************************************************************/
#ifdef CONFIG_SMP
int nxsched_get_affinity(pid_t pid, size_t cpusetsize, FAR cpu_set_t *mask);
#endif
/****************************************************************************
* Name: nxsched_set_affinity
*
* Description:
* sched_setaffinity() sets the CPU affinity mask of the thread whose ID
* is pid to the value specified by mask. If pid is zero, then the
* calling thread is used. The argument cpusetsize is the length (i
* bytes) of the data pointed to by mask. Normally this argument would
* be specified as sizeof(cpu_set_t).
*
* If the thread specified by pid is not currently running on one of the
* CPUs specified in mask, then that thread is migrated to one of the
* CPUs specified in mask.
*
* nxsched_set_affinity() is identical to the function sched_setparam(),
* differing only in its return value: This function does not modify
* the errno variable. This is a non-standard, internal OS function and
* is not intended for use by application logic. Applications should
* use the standard sched_setparam().
*
* Input Parameters:
* pid - The ID of thread whose affinity set will be modified.
* cpusetsize - Size of mask. MUST be sizeofcpu_set_t().
* mask - The location to return the thread's new affinity set.
*
* Returned Value:
* Zero (OK) if successful. Otherwise, a negated errno value is returned:
*
* ESRCH The task whose ID is pid could not be found.
*
****************************************************************************/
#ifdef CONFIG_SMP
int nxsched_set_affinity(pid_t pid, size_t cpusetsize,
FAR const cpu_set_t *mask);
#endif
/****************************************************************************
* Name: nxsched_get_stackinfo
*
* Description:
* Report information about a thread's stack allocation.
*
* Input Parameters:
* pid - Identifies the thread to query. Zero is interpreted as the
* the calling thread, -1 is interpreted as the calling task.
* stackinfo - User-provided location to return the stack information.
*
* Returned Value:
* Zero (OK) if successful. Otherwise, a negated errno value is returned.
*
* -ENOENT Returned if pid does not refer to an active task
* -EACCES The calling thread does not have privileges to access the
* stack of the thread associated with the pid.
*
****************************************************************************/
int nxsched_get_stackinfo(pid_t pid, FAR struct stackinfo_s *stackinfo);
/****************************************************************************
* Name: nxsched_get_stateinfo
*
* Description:
* Report information about a thread's state
*
* Input Parameters:
* tcb - The TCB for the task (same as the nxtask_init argument).
* state - User-provided location to return the state information.
* length - The size of the state
*
****************************************************************************/
void nxsched_get_stateinfo(FAR struct tcb_s *tcb, FAR char *state,
size_t length);
/****************************************************************************
* Name: nxsched_waitpid
*
* Description:
* This functions will obtain status information pertaining to one
* of the caller's child processes. This function will suspend
* execution of the calling thread until status information for one of the
* terminated child processes of the calling process is available, or until
* delivery of a signal whose action is either to execute a signal-catching
* function or to terminate the process. If more than one thread is
* suspended in nxsched_waitpid() awaiting termination of the same process,
* exactly one thread will return the process status at the time of the
* target process termination. If status information is available prior to
* the call to nxsched_waitpid(), return will be immediate.
*
* Input Parameters:
* pid - The task ID of the thread to waid for
* stat_loc - The location to return the exit status
* options - ignored
*
* Returned Value:
* If nxsched_waitpid() returns because the status of a child process is
* available, it will return a value equal to the process ID of the child
* process for which status is reported.
*
* If nxsched_waitpid() returns due to the delivery of a signal to the
* calling process, -1 will be returned and errno set to EINTR.
*
* If nxsched_waitpid() was invoked with WNOHANG set in options, it has
* at least one child process specified by pid for which status is not
* available, and status is not available for any process specified by
* pid, 0 is returned.
*
* Otherwise, (pid_t)-1 will be returned, and errno set to indicate the
* error:
*
* ECHILD - The process specified by pid does not exist or is not a child
* of the calling process, or the process group specified by pid
* does not exist does not have any member process that is a child
* of the calling process.
* EINTR - The function was interrupted by a signal. The value of the
* location pointed to by stat_loc is undefined.
* EINVAL - The options argument is not valid.
*
****************************************************************************/
#ifdef CONFIG_SCHED_WAITPID
pid_t nxsched_waitpid(pid_t pid, FAR int *stat_loc, int options);
#endif
/****************************************************************************
* Name: nxsched_gettid
*
* Description:
* Get the thread ID of the currently executing thread.
*
* Input parameters:
* None
*
* Returned Value:
* On success, returns the thread ID of the calling process.
*
****************************************************************************/
pid_t nxsched_gettid(void);
/****************************************************************************
* Name: nxsched_getpid
*
* Description:
* Get the Process ID of the currently executing task.
*
* Input parameters:
* None
*
* Returned Value:
* Normally when called from user applications, nxsched_getpid() will
* return the Process ID of the currently executing task. that is,
* the main task for the task groups. There is no specification for
* any errors returned from nxsched_getpid().
*
****************************************************************************/
pid_t nxsched_getpid(void);
/****************************************************************************
* Name: nxsched_getppid
*
* Description:
* Get the parent task ID of the currently executing task.
*
* Input parameters:
* None
*
* Returned Value:
* Normally when called from user applications, nxsched_getppid() will
* return the parent task ID of the currently executing task, that is,
* the task at the head of the ready-to-run list.
* There is no specification for any errors returned from
* nxsched_getppid().
*
* nxsched_getppid(), however, may be called from within the OS in some
* cases. There are certain situations during context switching when the
* OS data structures are in flux and where the current task at the head
* of the ready-to-run task list is not actually running.
* In that case, nxsched_getppid() will return the error: -ESRCH
*
****************************************************************************/
pid_t nxsched_getppid(void);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* __INCLUDE_NUTTX_SCHED_H */
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