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Diffstat (limited to 'nuttx/sched/sig_internal.h')
| -rw-r--r-- | nuttx/sched/sig_internal.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/nuttx/sched/sig_internal.h b/nuttx/sched/sig_internal.h new file mode 100644 index 000000000..6c0641742 --- /dev/null +++ b/nuttx/sched/sig_internal.h @@ -0,0 +1,190 @@ +/**************************************************************************** + * 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 */ |