/*
* Copyright (c) 2001-2007 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.
*/
/** @addtogroup genericproc
* @{
*/
/** @file
*/
#ifndef KERN_THREAD_H_
#define KERN_THREAD_H_
#include <synch/waitq.h>
#include <proc/task.h>
#include <time/timeout.h>
#include <cpu.h>
#include <synch/rwlock.h>
#include <synch/spinlock.h>
#include <adt/avl.h>
#include <mm/slab.h>
#include <arch/cpu.h>
#include <mm/tlb.h>
#include <proc/uarg.h>
#include <udebug/udebug.h>
#define THREAD_STACK_SIZE STACK_SIZE
#define THREAD_NAME_BUFLEN 20
extern char *thread_states[];
/* Thread flags */
/** Thread cannot be migrated to another CPU.
*
* When using this flag, the caller must set cpu in the thread_t
* structure manually before calling thread_ready (even on uniprocessor).
*/
#define THREAD_FLAG_WIRED (1 << 0)
/** Thread was migrated to another CPU and has not run yet. */
#define THREAD_FLAG_STOLEN (1 << 1)
/** Thread executes in userspace. */
#define THREAD_FLAG_USPACE (1 << 2)
/** Thread will be attached by the caller. */
#define THREAD_FLAG_NOATTACH (1 << 3)
/** Thread states. */
typedef enum {
/** It is an error, if thread is found in this state. */
Invalid,
/** State of a thread that is currently executing on some CPU. */
Running,
/** Thread in this state is waiting for an event. */
Sleeping,
/** State of threads in a run queue. */
Ready,
/** Threads are in this state before they are first readied. */
Entering,
/** After a thread calls thread_exit(), it is put into Exiting state. */
Exiting,
/** Threads that were not detached but exited are Lingering. */
Lingering
} state_t;
/** Thread structure. There is one per thread. */
typedef struct thread {
link_t rq_link; /**< Run queue link. */
link_t wq_link; /**< Wait queue link. */
link_t th_link; /**< Links to threads within containing task. */
/** Threads linkage to the threads_tree. */
avltree_node_t threads_tree_node;
/** Lock protecting thread structure.
*
* Protects the whole thread structure except list links above.
*/
SPINLOCK_DECLARE(lock);
char name[THREAD_NAME_BUFLEN];
/** Function implementing the thread. */
void (* thread_code)(void *);
/** Argument passed to thread_code() function. */
void *thread_arg;
/**
* From here, the stored context is restored when the thread is
* scheduled.
*/
context_t saved_context;
/**
* From here, the stored timeout context is restored when sleep times
* out.
*/
context_t sleep_timeout_context;
/**
* From here, the stored interruption context is restored when sleep is
* interrupted.
*/
context_t sleep_interruption_context;
/** If true, the thread can be interrupted from sleep. */
bool sleep_interruptible;
/** Wait queue in which this thread sleeps. */
waitq_t *sleep_queue;
/** Timeout used for timeoutable sleeping. */
timeout_t sleep_timeout;
/** Flag signalling sleep timeout in progress. */
volatile int timeout_pending;
/**
* True if this thread is executing copy_from_uspace().
* False otherwise.
*/
bool in_copy_from_uspace;
/**
* True if this thread is executing copy_to_uspace().
* False otherwise.
*/
bool in_copy_to_uspace;
/**
* If true, the thread will not go to sleep at all and will call
* thread_exit() before returning to userspace.
*/
bool interrupted;
/** If true, thread_join_timeout() cannot be used on this thread. */
bool detached;
/** Waitq for thread_join_timeout(). */
waitq_t join_wq;
/** Link used in the joiner_head list. */
link_t joiner_link;
fpu_context_t *saved_fpu_context;
int fpu_context_exists;
/*
* Defined only if thread doesn't run.
* It means that fpu context is in CPU that last time executes this
* thread. This disables migration.
*/
int fpu_context_engaged;
rwlock_type_t rwlock_holder_type;
/** Callback fired in scheduler before the thread is put asleep. */
void (* call_me)(void *);
/** Argument passed to call_me(). */
void *call_me_with;
/** Thread's state. */
state_t state;
/** Thread's flags. */
int flags;
/** Thread's CPU. */
cpu_t *cpu;
/** Containing task. */
task_t *task;
/** Ticks before preemption. */
uint64_t ticks;
/** Thread accounting. */
uint64_t cycles;
/** Last sampled cycle. */
uint64_t last_cycle;
/** Thread doesn't affect accumulated accounting. */
bool uncounted;
/** Thread's priority. Implemented as index to CPU->rq */
int priority;
/** Thread ID. */
thread_id_t tid;
/** Architecture-specific data. */
thread_arch_t arch;
/** Thread's kernel stack. */
uint8_t *kstack;
/** Debugging stuff */
SPINLOCK_DECLARE(debug_lock);
waitq_t go_wq;
call_t *debug_go_call;
unative_t syscall_args[6];
istate_t *uspace_state;
/** What type of event are we stopped in or 0 if none */
udebug_event_t cur_event;
bool debug_stop;
bool debug_stoppable;
bool debug_active; /**< In a debugging session */
} thread_t;
/** Thread list lock.
*
* This lock protects the threads_tree.
* Must be acquired before T.lock for each T of type thread_t.
*
*/
SPINLOCK_EXTERN(threads_lock);
/** AVL tree containing all threads. */
extern avltree_t threads_tree;
extern void thread_init(void);
extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task,
int flags, char *name, bool uncounted);
extern void thread_attach(thread_t *t, task_t *task);
extern int thread_attach_by_id(thread_t *t, task_id_t taskid);
extern void thread_ready(thread_t *t);
extern void thread_exit(void) __attribute__((noreturn));
#ifndef thread_create_arch
extern void thread_create_arch(thread_t *t);
#endif
#ifndef thr_constructor_arch
extern void thr_constructor_arch(thread_t *t);
#endif
#ifndef thr_destructor_arch
extern void thr_destructor_arch(thread_t *t);
#endif
extern void thread_sleep(uint32_t sec);
extern void thread_usleep(uint32_t usec);
#define thread_join(t) \
thread_join_timeout((t), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
extern int thread_join_timeout(thread_t *t, uint32_t usec, int flags);
extern void thread_detach(thread_t *t);
extern void thread_register_call_me(void (* call_me)(void *),
void *call_me_with);
extern void thread_print_list(void);
extern void thread_destroy(thread_t *t);
extern void thread_unattached_free(thread_t *t);
extern void thread_update_accounting(void);
extern bool thread_exists(thread_t *t);
/** Fpu context slab cache. */
extern slab_cache_t *fpu_context_slab;
/* Thread syscall prototypes. */
extern unative_t sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name, thread_id_t *uspace_thread_id);
extern unative_t sys_thread_exit(int uspace_status);
extern unative_t sys_thread_get_id(thread_id_t *uspace_thread_id);
#endif
/** @}
*/