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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @addtogroup Threads
* @{
*/
#ifndef _THREADS_H_
#define _THREADS_H_
/**
* Structure representing a thread.
* @extends ThreadsQueue
* @note Not all the listed fields are always needed, by switching off some
* not needed ChibiOS/RT subsystems it is possible to save RAM space by
* shrinking the @p Thread structure.
*/
struct Thread {
/** Next @p Thread in the threads list.*/
Thread *p_next;
/* End of the fields shared with the ThreadsList structure. */
/** Previous @p Thread in the threads list.*/
Thread *p_prev;
/* End of the fields shared with the ThreadsQueue structure. */
/** The thread priority.*/
tprio_t p_prio;
/* End of the fields shared with the ReadyList structure. */
/** Thread identifier. */
tid_t p_tid;
/** Current thread state.*/
tstate_t p_state;
/** Mode flags. */
tmode_t p_flags;
/** Machine dependent processor context.*/
struct context p_ctx;
#ifdef CH_USE_NESTED_LOCKS
cnt_t p_locks;
#endif
/*
* The following fields are merged in unions because they are all
* state-specific fields. This trick saves some extra space for each
* thread in the system.
*/
union {
/** Thread wakeup code (only valid when exiting the @p PRREADY state).*/
msg_t p_rdymsg;
/** The thread exit code (only while in @p PREXIT state).*/
msg_t p_exitcode;
#ifdef CH_USE_SEMAPHORES
/** Semaphore where the thread is waiting on (only in @p PRWTSEM state).*/
Semaphore *p_wtsemp;
#endif
#ifdef CH_USE_MUTEXES
/** Mutex where the thread is waiting on (only in @p PRWTMTX state).*/
Mutex *p_wtmtxp;
#endif
#ifdef CH_USE_CONDVARS
/** CondVar where the thread is waiting on (only in @p PRWTCOND state).*/
CondVar *p_wtcondp;
#endif
#ifdef CH_USE_MESSAGES
/** Destination thread for message send (only in @p PRSNDMSG state).*/
Thread *p_wtthdp;
#endif
#ifdef CH_USE_EVENTS
/** Enabled events mask (only while in @p PRWTOREVT or @p PRWTANDEVT
states). */
eventmask_t p_ewmask;
#endif
#ifdef CH_USE_TRACE
/** Kernel object where the thread is waiting on. It is only valid when
the thread is some sleeping states.*/
void *p_wtobjp;
#endif
};
/*
* Start of the optional fields.
*/
#ifdef CH_USE_WAITEXIT
/** The list of the threads waiting for this thread termination. */
Thread *p_waiting;
#endif
#ifdef CH_USE_MESSAGES
ThreadsQueue p_msgqueue;
msg_t p_msg;
#endif
#ifdef CH_USE_EVENTS
/** Pending events mask. */
eventmask_t p_epending;
#endif
#ifdef CH_USE_MUTEXES
/** List of mutexes owned by this thread, @p NULL terminated. */
Mutex *p_mtxlist;
/** Thread's own, non-inherited, priority. */
tprio_t p_realprio;
#endif
#if defined(CH_USE_DYNAMIC) && defined(CH_USE_MEMPOOLS)
/** Memory Pool where the thread workspace is returned. */
void *p_mpool;
#endif
/* Extra fields defined in chconf.h */
THREAD_EXT_FIELDS
};
/** Thread state: Ready to run, waiting on the ready list.*/
#define PRREADY 0
/** Thread state: Currently running. */
#define PRCURR 1
/** Thread state: Thread created in suspended state. */
#define PRSUSPENDED 2
/** Thread state: Waiting on a semaphore. */
#define PRWTSEM 3
/** Thread state: Waiting on a mutex. */
#define PRWTMTX 4
/** Thread state: Waiting in @p chThdSleep() or @p chThdSleepUntil(). */
#define PRWTCOND 5
/** Thread state: Waiting in @p chCondWait(). */
#define PRSLEEP 6
/** Thread state: Waiting in @p chThdWait(). */
#define PRWAIT 7
/** Thread state: Waiting in @p chEvtWaitOneTimeout() or
@p chEvtWaitAnyTimeout(). */
#define PRWTOREVT 8
/** Thread state: Waiting in @p chEvtWaitAllTimeout(). */
#define PRWTANDEVT 9
/** Thread state: Waiting in @p chMsgSend(). */
#define PRSNDMSG 10
/** Thread state: Waiting in @p chMsgWait(). */
#define PRWTMSG 11
/** Thread state: After termination.*/
#define PREXIT 12
/*
* Various flags into the thread p_flags field.
*/
#define P_MEM_MODE_MASK 3 /* Thread memory mode mask. */
#define P_MEM_MODE_STATIC 0 /* Thread memory mode: static. */
#define P_MEM_MODE_HEAP 1 /* Thread memory mode: heap. */
#define P_MEM_MODE_MEMPOOL 2 /* Thread memory mode: mempool. */
#define P_TERMINATE 4 /* Termination requested. */
#define P_SUSPENDED 8 /* Create suspended (old). */
/* Not an API, don't use into the application code.*/
Thread *init_thread(Thread *tp, tprio_t prio);
/** Thread function.*/
typedef msg_t (*tfunc_t)(void *);
/*
* Threads APIs.
*/
#ifdef __cplusplus
extern "C" {
#endif
Thread *chThdInit(void *workspace, size_t wsize,
tprio_t prio, tfunc_t pf, void *arg);
Thread *chThdCreateStatic(void *workspace, size_t wsize,
tprio_t prio, tfunc_t pf, void *arg);
#if defined(CH_USE_DYNAMIC) && defined(CH_USE_WAITEXIT) && defined(CH_USE_HEAP)
Thread *chThdCreateFromHeap(size_t wsize, tprio_t prio,
tfunc_t pf, void *arg);
#endif
#if defined(CH_USE_DYNAMIC) && defined(CH_USE_WAITEXIT) && defined(CH_USE_MEMPOOLS)
Thread *chThdCreateFromMemoryPool(MemoryPool *mp, tprio_t prio,
tfunc_t pf, void *arg);
#endif
void chThdSetPriority(tprio_t newprio);
Thread *chThdResume(Thread *tp);
void chThdSuspend(Thread **tpp);
void chThdTerminate(Thread *tp);
void chThdSleep(systime_t time);
void chThdSleepUntil(systime_t time);
void chThdExit(msg_t msg);
#ifdef CH_USE_WAITEXIT
msg_t chThdWait(Thread *tp);
#endif
#ifdef __cplusplus
}
#endif
/** Returns the pointer to the @p Thread currently in execution.*/
#define chThdSelf() currp
/** Returns the thread priority.*/
#define chThdGetPriority() (currp->p_prio)
/** Returns the pointer to the @p Thread local storage area, if any.*/
#define chThdLS() (void *)(currp + 1)
/** Verifies if the specified thread is in the @p PREXIT state.*/
#define chThdTerminated(tp) ((tp)->p_state == PREXIT)
/**
* Verifies if the current thread has a termination request pending.
*/
#define chThdShouldTerminate() (currp->p_flags & P_TERMINATE)
/**
* Resumes a thread created with the @p P_SUSPENDED option or suspended with
* @p chThdSuspend().
* @param tp the pointer to the thread
*/
#define chThdResumeI(tp) chSchReadyI(tp)
/**
* Suspends the invoking thread for the specified time.
* @param time the delay in system ticks
*/
#define chThdSleepS(time) chSchGoSleepTimeoutS(PRSLEEP, time)
/**
* Delays the invoking thread for the specified number of seconds.
* @note The specified time is rounded up to a value allowed by the real
* system clock.
* @note The maximum specified value is implementation dependent.
*/
#define chThdSleepSeconds(sec) chThdSleep(S2ST(sec))
/**
* Delays the invoking thread for the specified number of milliseconds.
* @note The specified time is rounded up to a value allowed by the real
* system clock.
* @note The maximum specified value is implementation dependent.
*/
#define chThdSleepMilliseconds(msec) chThdSleep(MS2ST(msec))
/**
* Delays the invoking thread for the specified number of microseconds.
* @note The specified time is rounded up to a value allowed by the real
* system clock.
* @note The maximum specified value is implementation dependent.
*/
#define chThdSleepMicroseconds(usec) chThdSleep(US2ST(usec))
#endif /* _THREADS_H_ */
/** @} */
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