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rockbox/firmware/kernel/include/queue.h
Michael Sevakis 6ed00870ab Base scheduler queues off linked lists and do cleanup/consolidation 
Abstracts threading from itself a bit, changes the way its queues are
handled and does type hiding for that as well.

Do alot here due to already required major brain surgery.

Threads may now be on a run queue and a wait queue simultaneously so
that the expired timer only has to wake the thread but not remove it
from the wait queue which simplifies the implicit wake handling.

List formats change for wait queues-- doubly-linked, not circular.
Timeout queue is now singly-linked. The run queue is still circular
as before.

Adds a better thread slot allocator that may keep the slot marked as
used regardless of the thread state. Assists in dumping special tasks
that switch_thread was tasked to perform (blocking tasks).

Deletes alot of code yet surprisingly, gets larger than expected.
Well, I'm not not minding that for the time being-- omlettes and break
a few eggs and all that.

Change-Id: I0834d7bb16b2aecb2f63b58886eeda6ae4f29d59
2014-08-16 05:15:37 -04:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Björn Stenberg
*
* 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 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef QUEUE_H
#define QUEUE_H
#include <stdint.h>
#include "config.h"
#include "thread.h"
/* System defined message ID's - |sign bit = 1|class|id| */
/* Event class list */
#define SYS_EVENT_CLS_QUEUE 0
#define SYS_EVENT_CLS_USB 1
#define SYS_EVENT_CLS_POWER 2
#define SYS_EVENT_CLS_FILESYS 3
#define SYS_EVENT_CLS_PLUG 4
#define SYS_EVENT_CLS_MISC 5
#define SYS_EVENT_CLS_PRIVATE 7 /* For use inside plugins */
/* make sure SYS_EVENT_CLS_BITS has enough range */
/* Bit 31->|S|c...c|i...i| */
#define SYS_EVENT ((long)(int)(1 << 31))
#define SYS_EVENT_CLS_BITS (3)
#define SYS_EVENT_CLS_SHIFT (31-SYS_EVENT_CLS_BITS)
#define SYS_EVENT_CLS_MASK (((1l << SYS_EVENT_CLS_BITS)-1) << SYS_EVENT_SHIFT)
#define MAKE_SYS_EVENT(cls, id) (SYS_EVENT | ((long)(cls) << SYS_EVENT_CLS_SHIFT) | (long)(id))
/* Macros for extracting codes */
#define SYS_EVENT_CLS(e) (((e) & SYS_EVENT_CLS_MASK) >> SYS_EVENT_SHIFT)
#define SYS_EVENT_ID(e) ((e) & ~(SYS_EVENT|SYS_EVENT_CLS_MASK))
#define SYS_TIMEOUT MAKE_SYS_EVENT(SYS_EVENT_CLS_QUEUE, 0)
#define SYS_USB_CONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 0)
#define SYS_USB_CONNECTED_ACK MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 1)
#define SYS_USB_DISCONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 2)
#define SYS_USB_LUN_LOCKED MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 4)
#define SYS_USB_READ_DATA MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 5)
#define SYS_USB_WRITE_DATA MAKE_SYS_EVENT(SYS_EVENT_CLS_USB, 6)
#define SYS_POWEROFF MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 0)
#define SYS_CHARGER_CONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 1)
#define SYS_CHARGER_DISCONNECTED MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 2)
#define SYS_BATTERY_UPDATE MAKE_SYS_EVENT(SYS_EVENT_CLS_POWER, 3)
#define SYS_FS_CHANGED MAKE_SYS_EVENT(SYS_EVENT_CLS_FILESYS, 0)
#define SYS_HOTSWAP_INSERTED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 0)
#define SYS_HOTSWAP_EXTRACTED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 1)
#define SYS_PHONE_PLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 2)
#define SYS_PHONE_UNPLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 3)
#define SYS_REMOTE_PLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 4)
#define SYS_REMOTE_UNPLUGGED MAKE_SYS_EVENT(SYS_EVENT_CLS_PLUG, 5)
#define SYS_CAR_ADAPTER_RESUME MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 0)
#define SYS_CALL_INCOMING MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 3)
#define SYS_CALL_HUNG_UP MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 4)
#define SYS_VOLUME_CHANGED MAKE_SYS_EVENT(SYS_EVENT_CLS_MISC, 5)
#define IS_SYSEVENT(ev) ((ev & SYS_EVENT) == SYS_EVENT)
#define MAX_NUM_QUEUES 32
#define QUEUE_LENGTH 16 /* MUST be a power of 2 */
#define QUEUE_LENGTH_MASK (QUEUE_LENGTH - 1)
struct queue_event
{
long id;
intptr_t data;
};
#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
struct queue_sender_list
{
/* If non-NULL, there is a thread waiting for the corresponding event */
/* Must be statically allocated to put in non-cached ram. */
struct thread_entry *senders[QUEUE_LENGTH]; /* message->thread map */
struct __wait_queue list; /* list of senders in map */
/* Send info for last message dequeued or NULL if replied or not sent */
struct thread_entry * volatile curr_sender;
#ifdef HAVE_PRIORITY_SCHEDULING
struct blocker blocker;
#endif
};
#endif /* HAVE_EXTENDED_MESSAGING_AND_NAME */
#ifdef HAVE_PRIORITY_SCHEDULING
#define QUEUE_GET_THREAD(q) \
(((q)->send == NULL) ? NULL : (q)->send->blocker.thread)
#else
/* Queue without priority enabled have no owner provision _at this time_ */
#define QUEUE_GET_THREAD(q) \
(NULL)
#endif
struct event_queue
{
struct __wait_queue queue; /* waiter list */
struct queue_event events[QUEUE_LENGTH]; /* list of events */
unsigned int volatile read; /* head of queue */
unsigned int volatile write; /* tail of queue */
#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
struct queue_sender_list * volatile send; /* list of threads waiting for
reply to an event */
#ifdef HAVE_PRIORITY_SCHEDULING
struct blocker *blocker_p; /* priority inheritance info
for sync message senders */
#endif
#endif
IF_COP( struct corelock cl; ) /* multiprocessor sync */
};
extern void queue_init(struct event_queue *q, bool register_queue);
extern void queue_delete(struct event_queue *q);
extern void queue_wait(struct event_queue *q, struct queue_event *ev);
extern void queue_wait_w_tmo(struct event_queue *q, struct queue_event *ev,
int ticks);
extern void queue_post(struct event_queue *q, long id, intptr_t data);
#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
extern void queue_enable_queue_send(struct event_queue *q,
struct queue_sender_list *send,
unsigned int owner_id);
extern intptr_t queue_send(struct event_queue *q, long id, intptr_t data);
extern void queue_reply(struct event_queue *q, intptr_t retval);
extern bool queue_in_queue_send(struct event_queue *q);
#endif /* HAVE_EXTENDED_MESSAGING_AND_NAME */
extern bool queue_empty(const struct event_queue* q);
extern bool queue_peek(struct event_queue *q, struct queue_event *ev);
#define QPEEK_FILTER_COUNT_MASK (0xffu) /* 0x00=1 filter, 0xff=256 filters */
#define QPEEK_FILTER_HEAD_ONLY (1u << 8) /* Ignored if no filters */
#define QPEEK_REMOVE_EVENTS (1u << 9) /* Remove or discard events */
#define QPEEK_FILTER1(a) QPEEK_FILTER2((a), (a))
#define QPEEK_FILTER2(a, b) (&(const long [2]){ (a), (b) })
extern bool queue_peek_ex(struct event_queue *q,
struct queue_event *ev,
unsigned int flags,
const long (*filters)[2]);
extern void queue_clear(struct event_queue* q);
extern void queue_remove_from_head(struct event_queue *q, long id);
extern int queue_count(const struct event_queue *q);
extern int queue_broadcast(long id, intptr_t data);
extern void init_queues(void);
#endif /* QUEUE_H */
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