fadbf0a6f7
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15709 a1c6a512-1295-4272-9138-f99709370657
567 lines
20 KiB
C
567 lines
20 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Ulf Ralberg
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef THREAD_H
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#define THREAD_H
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#include "config.h"
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#include <inttypes.h>
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#include <stddef.h>
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#include <stdbool.h>
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/* Priority scheduling (when enabled with HAVE_PRIORITY_SCHEDULING) works
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* by giving high priority threads more CPU time than less priority threads
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* when they need it.
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*
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* If software playback codec pcm buffer is going down to critical, codec
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* can change it own priority to REALTIME to override user interface and
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* prevent playback skipping.
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*/
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#define HIGHEST_PRIORITY 1 /* The highest possible thread priority */
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#define LOWEST_PRIORITY 100 /* The lowest possible thread priority */
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#define PRIORITY_REALTIME 1
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#define PRIORITY_USER_INTERFACE 4 /* The main thread */
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#define PRIORITY_RECORDING 4 /* Recording thread */
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#define PRIORITY_PLAYBACK 4 /* or REALTIME when needed */
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#define PRIORITY_BUFFERING 4 /* Codec buffering thread */
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#define PRIORITY_SYSTEM 6 /* All other firmware threads */
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#define PRIORITY_BACKGROUND 8 /* Normal application threads */
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#if CONFIG_CODEC == SWCODEC
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#define MAXTHREADS 17
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#else
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#define MAXTHREADS 11
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#endif
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#define DEFAULT_STACK_SIZE 0x400 /* Bytes */
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/**
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* "Busy" values that can be swapped into a variable to indicate
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* that the variable or object pointed to is in use by another processor
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* core. When accessed, the busy value is swapped-in while the current
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* value is atomically returned. If the swap returns the busy value,
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* the processor should retry the operation until some other value is
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* returned. When modification is finished, the new value should be
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* written which unlocks it and updates it atomically.
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*
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* Procedure:
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* while ((curr_value = swap(&variable, BUSY_VALUE)) == BUSY_VALUE);
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*
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* Modify/examine object at mem location or variable. Create "new_value"
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* as suitable.
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*
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* variable = new_value or curr_value;
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*
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* To check a value for busy and perform an operation if not:
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* curr_value = swap(&variable, BUSY_VALUE);
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*
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* if (curr_value != BUSY_VALUE)
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* {
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* Modify/examine object at mem location or variable. Create "new_value"
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* as suitable.
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* variable = new_value or curr_value;
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* }
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* else
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* {
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* Do nothing - already busy
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* }
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*
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* Only ever restore when an actual value is returned or else it could leave
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* the variable locked permanently if another processor unlocked in the
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* meantime. The next access attempt would deadlock for all processors since
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* an abandoned busy status would be left behind.
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*/
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#define STATE_BUSYuptr ((void*)UINTPTR_MAX)
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#define STATE_BUSYu8 UINT8_MAX
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#define STATE_BUSYi INT_MIN
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#ifndef SIMULATOR
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/* Need to keep structures inside the header file because debug_menu
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* needs them. */
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#ifdef CPU_COLDFIRE
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struct regs
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{
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unsigned int macsr; /* 0 - EMAC status register */
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unsigned int d[6]; /* 4-24 - d2-d7 */
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unsigned int a[5]; /* 28-44 - a2-a6 */
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void *sp; /* 48 - Stack pointer (a7) */
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void *start; /* 52 - Thread start address, or NULL when started */
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};
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#elif CONFIG_CPU == SH7034
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struct regs
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{
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unsigned int r[7]; /* 0-24 - Registers r8 thru r14 */
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void *sp; /* 28 - Stack pointer (r15) */
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void *pr; /* 32 - Procedure register */
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void *start; /* 36 - Thread start address, or NULL when started */
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};
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#elif defined(CPU_ARM)
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struct regs
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{
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unsigned int r[8]; /* 0-28 - Registers r4-r11 */
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void *sp; /* 32 - Stack pointer (r13) */
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unsigned int lr; /* 36 - r14 (lr) */
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void *start; /* 40 - Thread start address, or NULL when started */
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};
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#endif /* CONFIG_CPU */
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#else
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struct regs
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{
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void *t; /* Simulator OS thread */
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void *c; /* Condition for blocking and sync */
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void (*start)(void); /* Start function */
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};
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#endif /* !SIMULATOR */
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/* NOTE: The use of the word "queue" may also refer to a linked list of
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threads being maintainted that are normally dealt with in FIFO order
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and not nescessarily kernel event_queue */
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enum
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{
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/* States without a timeout must be first */
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STATE_KILLED = 0, /* Thread is killed (default) */
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STATE_RUNNING, /* Thread is currently running */
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STATE_BLOCKED, /* Thread is indefinitely blocked on a queue */
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/* These states involve adding the thread to the tmo list */
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STATE_SLEEPING, /* Thread is sleeping with a timeout */
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STATE_BLOCKED_W_TMO, /* Thread is blocked on a queue with a timeout */
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/* Miscellaneous states */
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STATE_FROZEN, /* Thread is suspended and will not run until
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thread_thaw is called with its ID */
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THREAD_NUM_STATES,
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TIMEOUT_STATE_FIRST = STATE_SLEEPING,
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#if NUM_CORES > 1
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STATE_BUSY = STATE_BUSYu8, /* Thread slot is being examined */
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#endif
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};
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#if NUM_CORES > 1
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#define THREAD_DESTRUCT ((const char *)0x84905617)
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#endif
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/* Link information for lists thread is in */
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struct thread_entry; /* forward */
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struct thread_list
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{
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struct thread_entry *prev; /* Previous thread in a list */
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struct thread_entry *next; /* Next thread in a list */
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};
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/* Small objects for core-wise mutual exclusion */
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#if CONFIG_CORELOCK == SW_CORELOCK
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/* No reliable atomic instruction available - use Peterson's algorithm */
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struct corelock
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{
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volatile unsigned char myl[NUM_CORES];
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volatile unsigned char turn;
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} __attribute__((packed));
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void corelock_init(struct corelock *cl);
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void corelock_lock(struct corelock *cl);
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int corelock_try_lock(struct corelock *cl);
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void corelock_unlock(struct corelock *cl);
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#elif CONFIG_CORELOCK == CORELOCK_SWAP
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/* Use native atomic swap/exchange instruction */
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struct corelock
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{
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unsigned char locked;
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} __attribute__((packed));
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#define corelock_init(cl) \
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({ (cl)->locked = 0; })
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#define corelock_lock(cl) \
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({ while (test_and_set(&(cl)->locked, 1)); })
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#define corelock_try_lock(cl) \
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({ test_and_set(&(cl)->locked, 1) ? 0 : 1; })
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#define corelock_unlock(cl) \
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({ (cl)->locked = 0; })
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#else
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/* No atomic corelock op needed or just none defined */
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#define corelock_init(cl)
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#define corelock_lock(cl)
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#define corelock_try_lock(cl)
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#define corelock_unlock(cl)
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#endif /* core locking selection */
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struct thread_queue
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{
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struct thread_entry *queue; /* list of threads waiting -
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_must_ be first member */
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#if CONFIG_CORELOCK == SW_CORELOCK
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struct corelock cl; /* lock for atomic list operations */
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#endif
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};
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/* Information kept in each thread slot
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* members are arranged according to size - largest first - in order
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* to ensure both alignment and packing at the same time.
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*/
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struct thread_entry
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{
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struct regs context; /* Register context at switch -
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_must_ be first member */
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void *stack; /* Pointer to top of stack */
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const char *name; /* Thread name */
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long tmo_tick; /* Tick when thread should be woken from
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timeout */
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struct thread_list l; /* Links for blocked/waking/running -
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circular linkage in both directions */
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struct thread_list tmo; /* Links for timeout list -
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Self-pointer-terminated in reverse direction,
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NULL-terminated in forward direction */
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struct thread_queue *bqp; /* Pointer to list variable in kernel
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object where thread is blocked - used
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for implicit unblock and explicit wake */
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#if CONFIG_CORELOCK == SW_CORELOCK
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struct thread_entry **bqnlp; /* Pointer to list variable in kernel
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object where thread is blocked - non-locked
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operations will be used */
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#endif
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struct thread_entry *queue; /* List of threads waiting for thread to be
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removed */
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#ifdef HAVE_EXTENDED_MESSAGING_AND_NAME
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intptr_t retval; /* Return value from a blocked operation */
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#endif
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#ifdef HAVE_PRIORITY_SCHEDULING
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long last_run; /* Last tick when started */
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#endif
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unsigned short stack_size; /* Size of stack in bytes */
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#ifdef HAVE_PRIORITY_SCHEDULING
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unsigned char priority; /* Current priority */
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unsigned char priority_x; /* Inherited priority - right now just a
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runtime guarantee flag */
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#endif
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unsigned char state; /* Thread slot state (STATE_*) */
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#if NUM_CORES > 1
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unsigned char core; /* The core to which thread belongs */
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#endif
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#ifdef HAVE_SCHEDULER_BOOSTCTRL
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unsigned char boosted; /* CPU frequency boost flag */
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#endif
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#if CONFIG_CORELOCK == SW_CORELOCK
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struct corelock cl; /* Corelock to lock thread slot */
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#endif
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};
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#if NUM_CORES > 1
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/* Operations to be performed just before stopping a thread and starting
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a new one if specified before calling switch_thread */
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#define TBOP_UNLOCK_LIST 0x01 /* Set a pointer variable address var_ptrp */
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#if CONFIG_CORELOCK == CORELOCK_SWAP
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#define TBOP_SET_VARi 0x02 /* Set an int at address var_ip */
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#define TBOP_SET_VARu8 0x03 /* Set an unsigned char at address var_u8p */
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#define TBOP_VAR_TYPE_MASK 0x03 /* Mask for variable type*/
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#endif /* CONFIG_CORELOCK */
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#define TBOP_UNLOCK_CORELOCK 0x04
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#define TBOP_UNLOCK_THREAD 0x08 /* Unlock a thread's slot */
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#define TBOP_UNLOCK_CURRENT 0x10 /* Unlock the current thread's slot */
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#define TBOP_IRQ_LEVEL 0x20 /* Set a new irq level */
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#define TBOP_SWITCH_CORE 0x40 /* Call the core switch preparation routine */
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struct thread_blk_ops
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{
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int irq_level; /* new IRQ level to set */
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#if CONFIG_CORELOCK != SW_CORELOCK
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union
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{
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int var_iv; /* int variable value to set */
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uint8_t var_u8v; /* unsigned char valur to set */
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struct thread_entry *list_v; /* list pointer queue value to set */
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};
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#endif
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union
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{
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#if CONFIG_CORELOCK != SW_CORELOCK
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int *var_ip; /* pointer to int variable */
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uint8_t *var_u8p; /* pointer to unsigned char varuable */
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#endif
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struct thread_queue *list_p; /* pointer to list variable */
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};
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#if CONFIG_CORELOCK == SW_CORELOCK
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struct corelock *cl_p; /* corelock to unlock */
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struct thread_entry *thread; /* thread to unlock */
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#elif CONFIG_CORELOCK == CORELOCK_SWAP
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unsigned char state; /* new thread state (performs unlock) */
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#endif /* SOFTWARE_CORELOCK */
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unsigned char flags; /* TBOP_* flags */
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};
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#endif /* NUM_CORES > 1 */
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/* Information kept for each core
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* Member are arranged for the same reason as in thread_entry
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*/
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struct core_entry
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{
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/* "Active" lists - core is constantly active on these and are never
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locked and interrupts do not access them */
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struct thread_entry *running; /* threads that are running */
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struct thread_entry *timeout; /* threads that are on a timeout before
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running again */
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/* "Shared" lists - cores interact in a synchronized manner - access
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is locked between cores and interrupts */
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struct thread_queue waking; /* intermediate locked list that
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hold threads other core should wake up
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on next task switch */
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long next_tmo_check; /* soonest time to check tmo threads */
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#if NUM_CORES > 1
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struct thread_blk_ops blk_ops; /* operations to perform when
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blocking a thread */
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#else
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#define STAY_IRQ_LEVEL (-1)
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int irq_level; /* sets the irq level to irq_level */
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#endif /* NUM_CORES */
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#ifdef HAVE_PRIORITY_SCHEDULING
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unsigned char highest_priority;
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#endif
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};
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#ifdef HAVE_PRIORITY_SCHEDULING
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#define IF_PRIO(...) __VA_ARGS__
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#else
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#define IF_PRIO(...)
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#endif
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/* Macros generate better code than an inline function is this case */
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#if (defined (CPU_PP) || defined (CPU_ARM))
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/* atomic */
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#if CONFIG_CORELOCK == SW_CORELOCK
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#define test_and_set(a, v, cl) \
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xchg8((a), (v), (cl))
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/* atomic */
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#define xchg8(a, v, cl) \
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({ uint32_t o; \
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corelock_lock(cl); \
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o = *(uint8_t *)(a); \
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*(uint8_t *)(a) = (v); \
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corelock_unlock(cl); \
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o; })
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#define xchg32(a, v, cl) \
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({ uint32_t o; \
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corelock_lock(cl); \
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o = *(uint32_t *)(a); \
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*(uint32_t *)(a) = (v); \
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corelock_unlock(cl); \
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o; })
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#define xchgptr(a, v, cl) \
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({ typeof (*(a)) o; \
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corelock_lock(cl); \
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o = *(a); \
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*(a) = (v); \
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corelock_unlock(cl); \
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o; })
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#elif CONFIG_CORELOCK == CORELOCK_SWAP
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/* atomic */
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#define test_and_set(a, v, ...) \
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xchg8((a), (v))
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#define xchg8(a, v, ...) \
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({ uint32_t o; \
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asm volatile( \
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"swpb %0, %1, [%2]" \
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: "=&r"(o) \
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: "r"(v), \
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"r"((uint8_t*)(a))); \
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o; })
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/* atomic */
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#define xchg32(a, v, ...) \
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({ uint32_t o; \
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asm volatile( \
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"swp %0, %1, [%2]" \
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: "=&r"(o) \
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: "r"((uint32_t)(v)), \
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"r"((uint32_t*)(a))); \
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o; })
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/* atomic */
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#define xchgptr(a, v, ...) \
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({ typeof (*(a)) o; \
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asm volatile( \
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"swp %0, %1, [%2]" \
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: "=&r"(o) \
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: "r"(v), "r"(a)); \
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o; })
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#endif /* locking selection */
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#elif defined (CPU_COLDFIRE)
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/* atomic */
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/* one branch will be optimized away if v is a constant expression */
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#define test_and_set(a, v, ...) \
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({ uint32_t o = 0; \
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if (v) { \
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asm volatile ( \
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"bset.b #0, (%0)" \
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: : "a"((uint8_t*)(a)) \
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: "cc"); \
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} else { \
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asm volatile ( \
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"bclr.b #0, (%0)" \
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: : "a"((uint8_t*)(a)) \
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: "cc"); \
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} \
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asm volatile ("sne.b %0" \
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: "+d"(o)); \
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o; })
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#elif CONFIG_CPU == SH7034
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/* atomic */
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#define test_and_set(a, v, ...) \
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({ uint32_t o; \
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asm volatile ( \
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"tas.b @%2 \n" \
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"mov #-1, %0 \n" \
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"negc %0, %0 \n" \
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: "=r"(o) \
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: "M"((uint32_t)(v)), /* Value of_v must be 1 */ \
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"r"((uint8_t *)(a))); \
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o; })
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#endif /* CONFIG_CPU == */
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/* defaults for no asm version */
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#ifndef test_and_set
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/* not atomic */
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#define test_and_set(a, v, ...) \
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({ uint32_t o = *(uint8_t *)(a); \
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*(uint8_t *)(a) = (v); \
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o; })
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#endif /* test_and_set */
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#ifndef xchg8
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/* not atomic */
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#define xchg8(a, v, ...) \
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({ uint32_t o = *(uint8_t *)(a); \
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*(uint8_t *)(a) = (v); \
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o; })
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#endif /* xchg8 */
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#ifndef xchg32
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/* not atomic */
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#define xchg32(a, v, ...) \
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({ uint32_t o = *(uint32_t *)(a); \
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*(uint32_t *)(a) = (v); \
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o; })
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#endif /* xchg32 */
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#ifndef xchgptr
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/* not atomic */
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#define xchgptr(a, v, ...) \
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({ typeof (*(a)) o = *(a); \
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*(a) = (v); \
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o; })
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#endif /* xchgptr */
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void core_idle(void);
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void core_wake(IF_COP_VOID(unsigned int core));
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#define CREATE_THREAD_FROZEN 0x00000001 /* Thread is frozen at create time */
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struct thread_entry*
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create_thread(void (*function)(void), void* stack, int stack_size,
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unsigned flags, const char *name
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IF_PRIO(, int priority)
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IF_COP(, unsigned int core));
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#ifdef HAVE_SCHEDULER_BOOSTCTRL
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void trigger_cpu_boost(void);
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void cancel_cpu_boost(void);
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#else
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#define trigger_cpu_boost()
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#define cancel_cpu_boost()
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#endif
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void thread_thaw(struct thread_entry *thread);
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void thread_wait(struct thread_entry *thread);
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void remove_thread(struct thread_entry *thread);
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void switch_thread(struct thread_entry *old);
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void sleep_thread(int ticks);
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/**
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* Setup to allow using thread queues as locked or non-locked without speed
|
|
* sacrifices in both core locking types.
|
|
*
|
|
* The blocking/waking function inline two different version of the real
|
|
* function into the stubs when a software or other separate core locking
|
|
* mechanism is employed.
|
|
*
|
|
* When a simple test-and-set or similar instruction is available, locking
|
|
* has no cost and so one version is used and the internal worker is called
|
|
* directly.
|
|
*
|
|
* CORELOCK_NONE is treated the same as when an atomic instruction can be
|
|
* used.
|
|
*/
|
|
|
|
/* Blocks the current thread on a thread queue */
|
|
#if CONFIG_CORELOCK == SW_CORELOCK
|
|
void block_thread(struct thread_queue *tq);
|
|
void block_thread_no_listlock(struct thread_entry **list);
|
|
#else
|
|
void _block_thread(struct thread_queue *tq);
|
|
static inline void block_thread(struct thread_queue *tq)
|
|
{ _block_thread(tq); }
|
|
static inline void block_thread_no_listlock(struct thread_entry **list)
|
|
{ _block_thread((struct thread_queue *)list); }
|
|
#endif /* CONFIG_CORELOCK */
|
|
|
|
/* Blocks the current thread on a thread queue for a max amount of time
|
|
* There is no "_no_listlock" version because timeout blocks without sync on
|
|
* the blocking queues is not permitted since either core could access the
|
|
* list at any time to do an implicit wake. In other words, objects with
|
|
* timeout support require lockable queues. */
|
|
void block_thread_w_tmo(struct thread_queue *tq, int timeout);
|
|
|
|
/* Wakes up the thread at the head of the queue */
|
|
#define THREAD_WAKEUP_NONE ((struct thread_entry *)NULL)
|
|
#define THREAD_WAKEUP_MISSING ((struct thread_entry *)(NULL+1))
|
|
#if CONFIG_CORELOCK == SW_CORELOCK
|
|
struct thread_entry * wakeup_thread(struct thread_queue *tq);
|
|
struct thread_entry * wakeup_thread_no_listlock(struct thread_entry **list);
|
|
#else
|
|
struct thread_entry * _wakeup_thread(struct thread_queue *list);
|
|
static inline struct thread_entry * wakeup_thread(struct thread_queue *tq)
|
|
{ return _wakeup_thread(tq); }
|
|
static inline struct thread_entry * wakeup_thread_no_listlock(struct thread_entry **list)
|
|
{ return _wakeup_thread((struct thread_queue *)list); }
|
|
#endif /* CONFIG_CORELOCK */
|
|
|
|
/* Initialize a thread_queue object. */
|
|
static inline void thread_queue_init(struct thread_queue *tq)
|
|
{ tq->queue = NULL; IF_SWCL(corelock_init(&tq->cl);) }
|
|
/* A convenience function for waking an entire queue of threads. */
|
|
static inline void thread_queue_wake(struct thread_queue *tq)
|
|
{ while (wakeup_thread(tq) != NULL); }
|
|
/* The no-listlock version of thread_queue_wake() */
|
|
static inline void thread_queue_wake_no_listlock(struct thread_entry **list)
|
|
{ while (wakeup_thread_no_listlock(list) != NULL); }
|
|
|
|
#ifdef HAVE_PRIORITY_SCHEDULING
|
|
int thread_set_priority(struct thread_entry *thread, int priority);
|
|
int thread_get_priority(struct thread_entry *thread);
|
|
/* Yield that guarantees thread execution once per round regardless of
|
|
thread's scheduler priority - basically a transient realtime boost
|
|
without altering the scheduler's thread precedence. */
|
|
void priority_yield(void);
|
|
#else
|
|
#define priority_yield yield
|
|
#endif /* HAVE_PRIORITY_SCHEDULING */
|
|
#if NUM_CORES > 1
|
|
unsigned int switch_core(unsigned int new_core);
|
|
#endif
|
|
struct thread_entry * thread_get_current(void);
|
|
void init_threads(void);
|
|
int thread_stack_usage(const struct thread_entry *thread);
|
|
#if NUM_CORES > 1
|
|
int idle_stack_usage(unsigned int core);
|
|
#endif
|
|
void thread_get_name(char *buffer, int size,
|
|
struct thread_entry *thread);
|
|
#ifdef RB_PROFILE
|
|
void profile_thread(void);
|
|
#endif
|
|
|
|
#endif /* THREAD_H */
|