0,0 → 1,322 |
/* |
* Copyright (C) 2001-2004 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
#include <proc/scheduler.h> |
#include <proc/thread.h> |
#include <proc/task.h> |
#include <mm/heap.h> |
#include <mm/frame.h> |
#include <mm/page.h> |
#include <arch/asm.h> |
#include <arch.h> |
#include <synch/synch.h> |
#include <synch/spinlock.h> |
#include <synch/waitq.h> |
#include <synch/rwlock.h> |
#include <cpu.h> |
#include <func.h> |
#include <context.h> |
#include <list.h> |
#include <typedefs.h> |
#include <time/clock.h> |
#include <list.h> |
#include <config.h> |
#include <arch/interrupt.h> |
#include <smp/ipi.h> |
#include <arch/faddr.h> |
#include <arch/atomic.h> |
#include <memstr.h> |
|
char *thread_states[] = {"Invalid", "Running", "Sleeping", "Ready", "Entering", "Exiting"}; /**< Thread states */ |
|
spinlock_t threads_lock; |
link_t threads_head; |
|
static spinlock_t tidlock; |
__u32 last_tid = 0; |
|
|
/** Thread wrapper |
* |
* This wrapper is provided to ensure that every thread |
* makes a call to thread_exit() when its implementing |
* function returns. |
* |
* interrupts_disable() is assumed. |
* |
*/ |
void cushion(void) |
{ |
void (*f)(void *) = THREAD->thread_code; |
void *arg = THREAD->thread_arg; |
|
/* this is where each thread wakes up after its creation */ |
before_thread_runs(); |
|
spinlock_unlock(&THREAD->lock); |
interrupts_enable(); |
|
f(arg); |
thread_exit(); |
/* not reached */ |
} |
|
|
/** Initialize threads |
* |
* Initialize kernel threads support. |
* |
*/ |
void thread_init(void) |
{ |
THREAD = NULL; |
nrdy = 0; |
spinlock_initialize(&threads_lock); |
list_initialize(&threads_head); |
} |
|
|
/** Make thread ready |
* |
* Switch thread t to the ready state. |
* |
* @param t Thread to make ready. |
* |
*/ |
void thread_ready(thread_t *t) |
{ |
cpu_t *cpu; |
runq_t *r; |
ipl_t ipl; |
int i, avg, send_ipi = 0; |
|
ipl = interrupts_disable(); |
|
spinlock_lock(&t->lock); |
|
i = (t->priority < RQ_COUNT -1) ? ++t->priority : t->priority; |
|
cpu = CPU; |
if (t->flags & X_WIRED) { |
cpu = t->cpu; |
} |
spinlock_unlock(&t->lock); |
|
/* |
* Append t to respective ready queue on respective processor. |
*/ |
r = &cpu->rq[i]; |
spinlock_lock(&r->lock); |
list_append(&t->rq_link, &r->rq_head); |
r->n++; |
spinlock_unlock(&r->lock); |
|
atomic_inc((int *) &nrdy); |
avg = nrdy / config.cpu_active; |
|
spinlock_lock(&cpu->lock); |
if ((++cpu->nrdy) > avg) { |
/* |
* If there are idle halted CPU's, this will wake them up. |
*/ |
ipi_broadcast(VECTOR_WAKEUP_IPI); |
} |
spinlock_unlock(&cpu->lock); |
|
interrupts_restore(ipl); |
} |
|
|
/** Create new thread |
* |
* Create a new thread. |
* |
* @param func Thread's implementing function. |
* @param arg Thread's implementing function argument. |
* @param task Task to which the thread belongs. |
* @param flags Thread flags. |
* |
* @return New thread's structure on success, NULL on failure. |
* |
*/ |
thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags) |
{ |
thread_t *t; |
__address frame_ks, frame_us = NULL; |
|
t = (thread_t *) malloc(sizeof(thread_t)); |
if (t) { |
ipl_t ipl; |
|
spinlock_initialize(&t->lock); |
|
frame_ks = frame_alloc(FRAME_KA); |
if (THREAD_USER_STACK & flags) { |
frame_us = frame_alloc(FRAME_KA); |
} |
|
ipl = interrupts_disable(); |
spinlock_lock(&tidlock); |
t->tid = ++last_tid; |
spinlock_unlock(&tidlock); |
interrupts_restore(ipl); |
|
memsetb(frame_ks, THREAD_STACK_SIZE, 0); |
link_initialize(&t->rq_link); |
link_initialize(&t->wq_link); |
link_initialize(&t->th_link); |
link_initialize(&t->threads_link); |
t->kstack = (__u8 *) frame_ks; |
t->ustack = (__u8 *) frame_us; |
|
context_save(&t->saved_context); |
context_set(&t->saved_context, FADDR(cushion), (__address) t->kstack, THREAD_STACK_SIZE); |
|
the_initialize((the_t *) t->kstack); |
|
ipl = interrupts_disable(); |
t->saved_context.ipl = interrupts_read(); |
interrupts_restore(ipl); |
|
t->thread_code = func; |
t->thread_arg = arg; |
t->ticks = -1; |
t->priority = -1; /* start in rq[0] */ |
t->cpu = NULL; |
t->flags = 0; |
t->state = Entering; |
t->call_me = NULL; |
t->call_me_with = NULL; |
|
timeout_initialize(&t->sleep_timeout); |
t->sleep_queue = NULL; |
t->timeout_pending = 0; |
|
t->rwlock_holder_type = RWLOCK_NONE; |
|
t->task = task; |
|
t->fpu_context_exists=0; |
t->fpu_context_engaged=0; |
|
/* |
* Register this thread in the system-wide list. |
*/ |
ipl = interrupts_disable(); |
spinlock_lock(&threads_lock); |
list_append(&t->threads_link, &threads_head); |
spinlock_unlock(&threads_lock); |
|
/* |
* Attach to the containing task. |
*/ |
spinlock_lock(&task->lock); |
list_append(&t->th_link, &task->th_head); |
spinlock_unlock(&task->lock); |
|
interrupts_restore(ipl); |
} |
|
return t; |
} |
|
|
/** Make thread exiting |
* |
* End current thread execution and switch it to the exiting |
* state. All pending timeouts are executed. |
* |
*/ |
void thread_exit(void) |
{ |
ipl_t ipl; |
|
restart: |
ipl = interrupts_disable(); |
spinlock_lock(&THREAD->lock); |
if (THREAD->timeout_pending) { /* busy waiting for timeouts in progress */ |
spinlock_unlock(&THREAD->lock); |
interrupts_restore(ipl); |
goto restart; |
} |
THREAD->state = Exiting; |
spinlock_unlock(&THREAD->lock); |
scheduler(); |
} |
|
|
/** Thread sleep |
* |
* Suspend execution of the current thread. |
* |
* @param sec Number of seconds to sleep. |
* |
*/ |
void thread_sleep(__u32 sec) |
{ |
thread_usleep(sec*1000000); |
} |
|
|
/** Thread usleep |
* |
* Suspend execution of the current thread. |
* |
* @param usec Number of microseconds to sleep. |
* |
*/ |
void thread_usleep(__u32 usec) |
{ |
waitq_t wq; |
|
waitq_initialize(&wq); |
|
(void) waitq_sleep_timeout(&wq, usec, SYNCH_NON_BLOCKING); |
} |
|
|
/** Register thread out-of-context invocation |
* |
* Register a function and its argument to be executed |
* on next context switch to the current thread. |
* |
* @param call_me Out-of-context function. |
* @param call_me_with Out-of-context function argument. |
* |
*/ |
void thread_register_call_me(void (* call_me)(void *), void *call_me_with) |
{ |
ipl_t ipl; |
|
ipl = interrupts_disable(); |
spinlock_lock(&THREAD->lock); |
THREAD->call_me = call_me; |
THREAD->call_me_with = call_me_with; |
spinlock_unlock(&THREAD->lock); |
interrupts_restore(ipl); |
} |