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/*
* Copyright (c) 2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _KERN_THREAD_I_H
#define _KERN_THREAD_I_H
#include <kern/condition_types.h>
#include <kern/cpumap.h>
#include <kern/list_types.h>
#include <kern/macros.h>
#include <kern/mutex_types.h>
#include <kern/param.h>
#include <machine/atomic.h>
#include <machine/tcb.h>
/*
* Forward declarations.
*/
struct sleepq;
struct thread_runq;
struct thread_fs_runq;
/*
* Thread flags.
*/
#define THREAD_YIELD 0x1UL /* Must yield the processor ASAP */
#define THREAD_DETACHED 0x2UL /* Resources automatically released on exit */
/*
* Thread states.
*
* Threads in the running state may not be on a run queue if they're being
* awaken.
*/
#define THREAD_RUNNING 0
#define THREAD_SLEEPING 1
#define THREAD_DEAD 2
/*
* Scheduling data for a real-time thread.
*/
struct thread_rt_data {
struct list node;
unsigned short time_slice;
};
/*
* Scheduling data for a fair-scheduling thread.
*/
struct thread_fs_data {
struct list group_node;
struct list runq_node;
struct thread_fs_runq *fs_runq;
unsigned long round;
unsigned short weight;
unsigned short work;
};
/*
* Maximum number of thread-specific data keys.
*/
#define THREAD_KEYS_MAX 4
/*
* Thread structure.
*
* Thread members are normally protected by the lock of the run queue they're
* associated with. Thread-local members are accessed without synchronization.
*/
struct thread {
struct tcb tcb;
/* Reference counter, must be changed atomically */
unsigned long nr_refs;
/* Flags must be changed atomically */
unsigned long flags;
/* Sleep/wakeup synchronization members */
struct thread_runq *runq;
const void *wchan_addr;
const char *wchan_desc;
unsigned short state;
/* Sleep queue available for lending */
struct sleepq *priv_sleepq;
/* Thread-local members */
unsigned short preempt;
unsigned short pinned;
unsigned short llsync_read;
/* Processors on which this thread is allowed to run */
struct cpumap cpumap;
/* Scheduling data */
struct thread_sched_data sched_data;
/* Class specific scheduling data */
union {
struct thread_rt_data rt_data;
struct thread_fs_data fs_data;
};
/*
* Thread-specific data should only be used by architecture-dependent code.
* For machine-independent code, new member variables should be added.
*
* TODO move those to the TCB and remove.
*/
void *tsd[THREAD_KEYS_MAX];
/* Members related to termination */
struct mutex join_lock;
struct condition join_cond;
int exited;
/* Read-only members */
struct task *task;
struct list task_node;
void *stack;
char name[THREAD_NAME_SIZE];
void (*fn)(void *);
void *arg;
} __aligned(CPU_L1_SIZE);
#define THREAD_ATTR_DETACHED 0x1
void thread_destroy(struct thread *thread);
/*
* Flag access functions.
*/
static inline void
thread_set_flag(struct thread *thread, unsigned long flag)
{
atomic_or_ulong(&thread->flags, flag);
}
static inline void
thread_clear_flag(struct thread *thread, unsigned long flag)
{
atomic_and_ulong(&thread->flags, ~flag);
}
static inline int
thread_test_flag(struct thread *thread, unsigned long flag)
{
barrier();
return ((thread->flags & flag) != 0);
}
#endif /* _KERN_THREAD_I_H */
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