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/****************************************************************************
* sched/sig_internal.h
*
* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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 __SCHED_SIG_INTERNAL_H
#define __SCHED_SIG_INTERNAL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/compiler.h>
#include <stdint.h>
#include <queue.h>
#include <sched.h>
#include <nuttx/kmalloc.h>
/****************************************************************************
* Definitions
****************************************************************************/
/* The following definition determines the number of signal structures to
* allocate in a block
*/
#define NUM_SIGNAL_ACTIONS 16
#define NUM_PENDING_ACTIONS 16
#define NUM_PENDING_INT_ACTIONS 8
#define NUM_SIGNALS_PENDING 16
#define NUM_INT_SIGNALS_PENDING 8
/****************************************************************************
* Public Type Definitions
****************************************************************************/
enum sigalloc_e
{
SIG_ALLOC_FIXED = 0, /* pre-allocated; never freed */
SIG_ALLOC_DYN, /* dynamically allocated; free when unused */
SIG_ALLOC_IRQ /* Preallocated, reserved for interrupt handling */
};
typedef enum sigalloc_e sigalloc_t;
/* The following defines the sigaction queue entry */
struct sigactq
{
FAR struct sigactq *flink; /* Forward link */
struct sigaction act; /* Sigaction data */
uint8_t signo; /* Signal associated with action */
};
typedef struct sigactq sigactq_t;
/* The following defines the queue structure within each TCB to hold pending
* signals received by the task. These are signals that cannot be processed
* because: (1) the task is not waiting for them, or (2) the task has no
* action associated with the signal.
*/
struct sigpendq
{
FAR struct sigpendq *flink; /* Forward link */
siginfo_t info; /* Signal information */
uint8_t type; /* (Used to manage allocations) */
};
typedef struct sigpendq sigpendq_t;
/* The following defines the queue structure within each TCB to hold queued
* signal actions that need action by the task
*/
struct sigq_s
{
FAR struct sigq_s *flink; /* Forward link */
union
{
void (*sighandler)(int signo, siginfo_t *info, void *context);
} action; /* Signal action */
sigset_t mask; /* Additional signals to mask while the
* the signal-catching function executes */
siginfo_t info; /* Signal information */
uint8_t type; /* (Used to manage allocations) */
};
typedef struct sigq_s sigq_t;
/****************************************************************************
* Global Variables
****************************************************************************/
/* The g_sigfreeaction data structure is a list of available signal action
* structures.
*/
extern sq_queue_t g_sigfreeaction;
/* The g_sigpendingaction data structure is a list of available pending
* signal action structures.
*/
extern sq_queue_t g_sigpendingaction;
/* The g_sigpendingirqaction is a list of available pending signal actions
* that are reserved for use by interrupt handlers.
*/
extern sq_queue_t g_sigpendingirqaction;
/* The g_sigpendingsignal data structure is a list of available pending
* signal structures.
*/
extern sq_queue_t g_sigpendingsignal;
/* The g_sigpendingirqsignal data structure is a list of available pending
* signal structures that are reserved for use by interrupt handlers.
*/
extern sq_queue_t g_sigpendingirqsignal;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/* Internal signal-related interfaces ***************************************/
/* sig_intialize.c */
void weak_function sig_initialize(void);
void sig_allocateactionblock(void);
/* sig_action.c */
void sig_releaseaction(FAR sigactq_t *sigact);
/* sig_pending.c */
sigset_t sig_pendingset(FAR _TCB *stcb);
/* In files of the same name */
FAR sigq_t *sig_allocatependingsigaction(void);
void sig_cleanup(FAR _TCB *stcb);
void sig_deliver(FAR _TCB *stcb);
FAR sigactq_t *sig_findaction(FAR _TCB *stcb, int signo);
int sig_lowest(FAR sigset_t *set);
#ifdef CONFIG_CAN_PASS_STRUCTS
int sig_mqnotempty(int tid, int signo, union sigval value);
#else
int sig_mqnotempty(int tid, int signo, FAR void *sival_ptr);
#endif
int sig_received(FAR _TCB *stcb, FAR siginfo_t *info);
void sig_releasependingsigaction(FAR sigq_t *sigq);
void sig_releasependingsignal(FAR sigpendq_t *sigpend);
FAR sigpendq_t *sig_removependingsignal(FAR _TCB *stcb, int signo);
void sig_unmaskpendingsignal(void);
#endif /* __SCHED_SIG_INTERNAL_H */
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