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f6d0a79298
A new scheduler replaces the old one. - There are no sched_xxx_notify() calls that ask scheduler to change task state. - Tasks now have priorities and different timeslices. - One second interval is distributed among processes. - There are just runnable and expired queues. - SCHED_GRANULARITY determines a maximum running boundary for tasks. - Scheduler can now detect a safe point and suspend a task. Interruptible blocking is implemented. - Mutexes, waitqueues and ipc are modified to have an interruptible nature. - Sleep information is stored on the ktcb. (which waitqueue? etc.)
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*
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* Thread Control Block, kernel portion.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __TCB_H__
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#define __TCB_H__
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#include <l4/lib/list.h>
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#include <l4/lib/mutex.h>
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#include <l4/generic/scheduler.h>
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#include <l4/generic/pgalloc.h>
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#include INC_GLUE(memory.h)
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#include INC_GLUE(syscall.h)
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#include INC_GLUE(message.h)
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#include INC_GLUE(context.h)
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#include INC_SUBARCH(mm.h)
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/*
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* These are a mixture of flags that indicate the task is
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* in a transitional state that could include one or more
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* scheduling states.
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*/
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#define TASK_INTERRUPTED (1 << 0)
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#define TASK_SUSPENDING (1 << 1)
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#define TASK_RESUMING (1 << 2)
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/* Scheduler states */
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enum task_state {
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TASK_INACTIVE = 0,
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TASK_SLEEPING = 1,
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TASK_RUNNABLE = 2,
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};
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#define TASK_ID_INVALID -1
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struct task_ids {
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l4id_t tid;
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l4id_t spid;
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l4id_t tgid;
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};
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struct ktcb {
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/* User context */
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task_context_t context;
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/*
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* Reference to the context on stack
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* saved at the beginning of a syscall trap.
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*/
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syscall_context_t *syscall_regs;
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/* Runqueue related */
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struct list_head rq_list;
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/* Thread information */
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l4id_t tid; /* Global thread id */
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l4id_t spid; /* Global space id */
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l4id_t tgid; /* Global thread group id */
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/* Flags to indicate various task status */
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unsigned int flags;
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/* Lock for blocking thread state modifications via a syscall */
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struct mutex thread_control_lock;
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/* Other related threads */
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l4id_t pagerid;
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u32 ts_need_resched; /* Scheduling flag */
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enum task_state state;
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struct list_head task_list; /* Global task list. */
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struct utcb *utcb; /* Reference to task's utcb area */
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/* Thread times */
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u32 kernel_time; /* Ticks spent in kernel */
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u32 user_time; /* Ticks spent in userland */
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u32 ticks_left; /* Timeslice ticks left for reschedule */
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u32 ticks_assigned; /* Ticks assigned to this task on this HZ */
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u32 sched_granule; /* Granularity ticks left for reschedule */
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int priority; /* Task's fixed, default priority */
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/* Number of locks the task currently has acquired */
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int nlocks;
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/* Page table information */
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pgd_table_t *pgd;
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/* Fields for ipc rendezvous */
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struct waitqueue_head wqh_recv;
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struct waitqueue_head wqh_send;
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l4id_t expected_sender;
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/* Tells where we are when we sleep */
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struct spinlock waitlock;
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struct waitqueue_head *waiting_on;
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struct waitqueue *wq;
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};
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/* Per thread kernel stack unified on a single page. */
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union ktcb_union {
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struct ktcb ktcb;
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char kstack[PAGE_SIZE];
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};
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/* For traversing global task list */
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extern struct list_head global_task_list;
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static inline struct ktcb *find_task(l4id_t tid)
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{
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struct ktcb *task;
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list_for_each_entry(task, &global_task_list, task_list)
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if (task->tid == tid)
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return task;
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return 0;
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}
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static inline int add_task_global(struct ktcb *new)
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{
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INIT_LIST_HEAD(&new->task_list);
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list_add(&new->task_list, &global_task_list);
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return 0;
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}
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/*
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* Each task is allocated a unique global id. A thread group can only belong to
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* a single leader, and every thread can only belong to a single thread group.
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* These rules allow the fact that every global id can be used to define a
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* unique thread group id. Thread local ids are used as an index into the thread
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* group's utcb area to discover the per-thread utcb structure.
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*/
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static inline void set_task_ids(struct ktcb *task, struct task_ids *ids)
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{
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task->tid = ids->tid;
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task->spid = ids->spid;
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task->tgid = ids->tgid;
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}
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#define THREAD_IDS_MAX 1024
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#define SPACE_IDS_MAX 1024
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#define TGROUP_IDS_MAX 1024
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extern struct id_pool *thread_id_pool;
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extern struct id_pool *space_id_pool;
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extern struct id_pool *tgroup_id_pool;
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#endif /* __TCB_H__ */
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