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nuttx/sched/signal/signal.h
Xiang Xiao 854276285c sched/signal: Reduce the initial memory consumption 
1.Don't preallocate sigaction list since it's used only in the task context
2.Reduce the preserved item which is used only in the task context from 16 to 4
The total memory decrease from 1280B to 480B

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: Ib5d5a7365c7d443fc0e99c0d3ea943e85f67ca8c
2020-08-10 08:07:50 +02:00

220 lines
7.5 KiB
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/****************************************************************************
* sched/signal/signal.h
*
* Copyright (C) 2007-2009, 2013-2014, 2017 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_SIGNAL_SIGNAL_H
#define __SCHED_SIGNAL_SIGNAL_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/compiler.h>
#include <stdint.h>
#include <stdbool.h>
#include <queue.h>
#include <sched.h>
#include <nuttx/kmalloc.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The following definition determines the number of signal structures to
* allocate in a block
*/
#define NUM_SIGNAL_ACTIONS 4
#define NUM_PENDING_ACTIONS 4
#define NUM_PENDING_INT_ACTIONS 8
#define NUM_SIGNALS_PENDING 4
#define NUM_INT_SIGNALS_PENDING 8
/****************************************************************************
* Public Type Definitions
****************************************************************************/
/* This enumeration identifies the type of signal data allocation */
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 */
};
/* 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;
/****************************************************************************
* Public Data
****************************************************************************/
/* 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 ***************************************/
/* Forward references */
struct task_group_s;
/* sig_initializee.c */
void weak_function nxsig_initialize(void);
void nxsig_alloc_actionblock(void);
/* sig_action.c */
void nxsig_release_action(FAR sigactq_t *sigact);
/* sig_default.c */
#ifdef CONFIG_SIG_DEFAULT
bool nxsig_isdefault(FAR struct tcb_s *tcb, int signo);
bool nxsig_iscatchable(int signo);
_sa_handler_t nxsig_default(FAR struct tcb_s *tcb, int signo,
bool defaction);
int nxsig_default_initialize(FAR struct tcb_s *tcb);
#endif
/* sig_pending.c */
sigset_t nxsig_pendingset(FAR struct tcb_s *stcb);
/* sig_dispatch.c */
int nxsig_tcbdispatch(FAR struct tcb_s *stcb,
FAR siginfo_t *info);
int nxsig_dispatch(pid_t pid, FAR siginfo_t *info);
/* sig_cleanup.c */
void nxsig_cleanup(FAR struct tcb_s *stcb);
void nxsig_release(FAR struct task_group_s *group);
/* sig_timedwait.c */
#ifdef CONFIG_CANCELLATION_POINTS
void nxsig_wait_irq(FAR struct tcb_s *wtcb, int errcode);
#endif
/* In files of the same name */
FAR sigq_t *nxsig_alloc_pendingsigaction(void);
void nxsig_deliver(FAR struct tcb_s *stcb);
FAR sigactq_t *nxsig_find_action(FAR struct task_group_s *group,
int signo);
int nxsig_lowest(FAR sigset_t *set);
void nxsig_release_pendingsigaction(FAR sigq_t *sigq);
void nxsig_release_pendingsignal(FAR sigpendq_t *sigpend);
FAR sigpendq_t *nxsig_remove_pendingsignal(FAR struct tcb_s *stcb,
int signo);
bool nxsig_unmask_pendingsignal(void);
#endif /* __SCHED_SIGNAL_SIGNAL_H */
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