/*
* 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.
*/
#ifndef __THREAD_H__
#define __THREAD_H__
#include <arch/proc/thread.h>
#include <synch/spinlock.h>
#include <arch/context.h>
#include <fpu_context.h>
#include <arch/types.h>
#include <typedefs.h>
#include <time/timeout.h>
#include <synch/rwlock.h>
#include <synch/synch.h>
#include <config.h>
#include <adt/btree.h>
#include <adt/list.h>
#include <mm/slab.h>
#include <proc/uarg.h>
#define THREAD_STACK_SIZE STACK_SIZE
enum state {
Invalid, /**< It is an error, if thread is found in this state. */
Running, /**< State of a thread that is currently executing on some CPU. */
Sleeping, /**< Thread in this state is waiting for an event. */
Ready, /**< State of threads in a run queue. */
Entering, /**< Threads are in this state before they are first readied. */
Exiting, /**< After a thread calls thread_exit(), it is put into Exiting state. */
Undead /**< Threads that were not detached but exited are in the Undead state. */
};
extern char *thread_states[];
#define X_WIRED (1<<0)
#define X_STOLEN (1<<1)
#define THREAD_NAME_BUFLEN 20
/** Thread structure. There is one per thread. */
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. */
/** Lock protecting thread structure.
*
* Protects the whole thread structure except list links above.
*/
SPINLOCK_DECLARE(lock);
char name[THREAD_NAME_BUFLEN];
void (* thread_code)(void *); /**< Function implementing the thread. */
void *thread_arg; /**< Argument passed to thread_code() function. */
/** 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;
bool sleep_interruptible; /**< If true, the thread can be interrupted from sleep. */
waitq_t *sleep_queue; /**< Wait queue in which this thread sleeps. */
timeout_t sleep_timeout; /**< Timeout used for timeoutable sleeping. */
volatile int timeout_pending; /**< Flag signalling sleep timeout in progress. */
/** 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;
bool detached; /**< If true, thread_join_timeout() cannot be used on this thread. */
waitq_t join_wq; /**< Waitq for thread_join_timeout(). */
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;
void (* call_me)(void *); /**< Funtion to be called in scheduler before the thread is put asleep. */
void *call_me_with; /**< Argument passed to call_me(). */
state_t state; /**< Thread's state. */
int flags; /**< Thread's flags. */
cpu_t *cpu; /**< Thread's CPU. */
task_t *task; /**< Containing task. */
__u64 ticks; /**< Ticks before preemption. */
int priority; /**< Thread's priority. Implemented as index to CPU->rq */
__u32 tid; /**< Thread ID. */
thread_arch_t arch; /**< Architecture-specific data. */
__u8 *kstack; /**< Thread's kernel stack. */
};
/** Thread list lock.
*
* This lock protects all link_t structures chained in threads_head.
* Must be acquired before T.lock for each T of type thread_t.
*
*/
extern spinlock_t threads_lock;
extern btree_t threads_btree; /**< B+tree containing all threads. */
extern void thread_init(void);
extern thread_t *thread_create(void (* func)(void *), void *arg, task_t *task, int flags, char *name);
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
extern void thread_sleep(__u32 sec);
extern void thread_usleep(__u32 usec);
#define thread_join(t) thread_join_timeout((t), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
extern int thread_join_timeout(thread_t *t, __u32 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 bool thread_exists(thread_t *t);
/* Fpu context slab cache */
extern slab_cache_t *fpu_context_slab;
/** Thread syscall prototypes. */
__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name);
__native sys_thread_exit(int uspace_status);
#endif