427 lines
10 KiB
C
427 lines
10 KiB
C
/*
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* Copyright (c) 2005 David Xu <davidxu@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/types.h>
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#include <machine/atomic.h>
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#include "namespace.h"
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#include <err.h>
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#include <ucontext.h>
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#include <sys/thr.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <pthread.h>
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#include "un-namespace.h"
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#include "sigev_thread.h"
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LIST_HEAD(sigev_list_head, sigev_node);
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#define HASH_QUEUES 17
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#define HASH(t, id) ((((id) << 3) + (t)) % HASH_QUEUES)
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static struct sigev_list_head sigev_hash[HASH_QUEUES];
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static struct sigev_list_head sigev_all;
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static int sigev_generation;
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static pthread_mutex_t *sigev_list_mtx;
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static TAILQ_HEAD(,sigev_thread_node) sigev_threads;
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static pthread_mutex_t *sigev_threads_mtx;
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static pthread_attr_t sigev_default_attr;
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static pthread_once_t sigev_once = PTHREAD_ONCE_INIT;
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static void __sigev_fork_prepare(void);
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static void __sigev_fork_parent(void);
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static void __sigev_fork_child(void);
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static struct sigev_thread_node *sigev_thread_create(pthread_attr_t *);
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static void *sigev_service_loop(void *);
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#pragma weak pthread_create
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#pragma weak pthread_attr_getschedpolicy
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#pragma weak pthread_attr_getinheritsched
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#pragma weak pthread_attr_getschedparam
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#pragma weak pthread_attr_getscope
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#pragma weak pthread_attr_getstacksize
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#pragma weak pthread_attr_getstackaddr
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#pragma weak pthread_attr_getguardsize
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#pragma weak pthread_attr_init
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#pragma weak pthread_attr_setscope
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#pragma weak pthread_attr_setdetachstate
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#pragma weak pthread_atfork
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#pragma weak _pthread_once
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#pragma weak pthread_cleanup_push
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#pragma weak pthread_cleanup_pop
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#pragma weak pthread_setcancelstate
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static __inline void
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attr2sna(pthread_attr_t *attr, struct sigev_thread_attr *sna)
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{
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struct sched_param sched_param;
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pthread_attr_getschedpolicy(attr, &sna->sna_policy);
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pthread_attr_getinheritsched(attr, &sna->sna_inherit);
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pthread_attr_getschedparam(attr, &sched_param);
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sna->sna_prio = sched_param.sched_priority;
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pthread_attr_getscope(attr, &sna->sna_scope);
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pthread_attr_getstacksize(attr, &sna->sna_stacksize);
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pthread_attr_getstackaddr(attr, &sna->sna_stackaddr);
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pthread_attr_getguardsize(attr, &sna->sna_guardsize);
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}
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static __inline int
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sna_eq(const struct sigev_thread_attr *a, const struct sigev_thread_attr *b)
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{
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return memcmp(a, b, sizeof(*a)) == 0;
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}
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static __inline int
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have_threads(void)
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{
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return (pthread_create != NULL);
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}
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void
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__sigev_thread_init(void)
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{
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static int notfirst = 0;
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int i;
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sigev_list_mtx = malloc(sizeof(pthread_mutex_t));
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_pthread_mutex_init(sigev_list_mtx, NULL);
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sigev_threads_mtx = malloc(sizeof(pthread_mutex_t));
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_pthread_mutex_init(sigev_threads_mtx, NULL);
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for (i = 0; i < HASH_QUEUES; ++i)
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LIST_INIT(&sigev_hash[i]);
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LIST_INIT(&sigev_all);
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TAILQ_INIT(&sigev_threads);
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if (!notfirst) {
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pthread_attr_init(&sigev_default_attr);
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pthread_attr_setscope(&sigev_default_attr, PTHREAD_SCOPE_SYSTEM);
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pthread_attr_setdetachstate(&sigev_default_attr,
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PTHREAD_CREATE_DETACHED);
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pthread_atfork(__sigev_fork_prepare, __sigev_fork_parent,
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__sigev_fork_child);
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notfirst = 1;
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}
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}
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int
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__sigev_check_init(void)
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{
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if (!have_threads())
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return (-1);
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_pthread_once(&sigev_once, __sigev_thread_init);
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return (0);
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}
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void
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__sigev_fork_prepare(void)
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{
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__sigev_thread_list_lock();
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}
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void
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__sigev_fork_parent(void)
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{
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__sigev_thread_list_unlock();
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}
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void
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__sigev_fork_child(void)
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{
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__sigev_thread_init();
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}
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int
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__sigev_list_lock(void)
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{
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return _pthread_mutex_lock(sigev_list_mtx);
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}
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int
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__sigev_list_unlock(void)
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{
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return _pthread_mutex_unlock(sigev_list_mtx);
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}
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int
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__sigev_thread_list_lock(void)
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{
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return _pthread_mutex_lock(sigev_threads_mtx);
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}
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int
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__sigev_thread_list_unlock(void)
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{
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return _pthread_mutex_unlock(sigev_threads_mtx);
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}
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struct sigev_node *
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__sigev_alloc(int type, const struct sigevent *evp)
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{
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struct sigev_node *sn;
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sn = calloc(1, sizeof(*sn));
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if (sn != NULL) {
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sn->sn_value = evp->sigev_value;
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sn->sn_func = evp->sigev_notify_function;
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sn->sn_gen = atomic_fetchadd_int(&sigev_generation, 1);
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sn->sn_type = type;
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sn->sn_tn = sigev_thread_create(evp->sigev_notify_attributes);
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if (sn->sn_tn == NULL) {
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free(sn);
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sn = NULL;
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}
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}
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return (sn);
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}
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void
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__sigev_get_sigevent(struct sigev_node *sn, struct sigevent *newevp,
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sigev_id_t id)
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{
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/*
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* Build a new sigevent, and tell kernel to deliver SIGEV_SIGSERVICE
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* signal to the new thread.
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*/
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newevp->sigev_notify = SIGEV_THREAD_ID;
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newevp->sigev_signo = SIGEV_SIGSERVICE;
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newevp->sigev_notify_thread_id = (lwpid_t)sn->sn_tn->tn_lwpid;
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newevp->sigev_value.sival_ptr = (void *)id;
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}
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void
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__sigev_free(struct sigev_node *sn)
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{
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free(sn);
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}
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struct sigev_node *
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__sigev_find(int type, sigev_id_t id)
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{
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struct sigev_node *sn;
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int chain = HASH(type, id);
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LIST_FOREACH(sn, &sigev_hash[chain], sn_link) {
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if (sn->sn_type == type && sn->sn_id == id)
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break;
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}
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return (sn);
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}
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int
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__sigev_register(struct sigev_node *sn)
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{
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int chain = HASH(sn->sn_type, sn->sn_id);
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LIST_INSERT_HEAD(&sigev_hash[chain], sn, sn_link);
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LIST_INSERT_HEAD(&sigev_all, sn, sn_allist);
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return (0);
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}
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int
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__sigev_delete(int type, sigev_id_t id)
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{
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struct sigev_node *sn;
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sn = __sigev_find(type, id);
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if (sn != NULL)
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return (__sigev_delete_node(sn));
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return (0);
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}
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int
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__sigev_delete_node(struct sigev_node *sn)
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{
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LIST_REMOVE(sn, sn_link);
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LIST_REMOVE(sn, sn_allist);
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if (sn->sn_flags & SNF_WORKING)
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sn->sn_flags |= SNF_REMOVED;
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else
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__sigev_free(sn);
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return (0);
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}
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static
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sigev_id_t
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sigev_get_id(siginfo_t *si)
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{
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switch(si->si_code) {
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case SI_TIMER:
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return (si->si_timerid);
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case SI_MESGQ:
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return (si->si_mqd);
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case SI_ASYNCIO:
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return (sigev_id_t)si->si_value.sival_ptr;
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default:
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warnx("%s %s : unknown si_code %d\n", __FILE__, __func__,
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si->si_code);
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}
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return (-1);
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}
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static struct sigev_thread_node *
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sigev_thread_create(pthread_attr_t *pattr)
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{
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struct sigev_thread_node *tn;
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struct sigev_thread_attr sna;
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sigset_t set;
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int ret;
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if (pattr == NULL)
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pattr = &sigev_default_attr;
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else {
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pthread_attr_setscope(pattr, PTHREAD_SCOPE_SYSTEM);
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pthread_attr_setdetachstate(pattr, PTHREAD_CREATE_DETACHED);
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}
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attr2sna(pattr, &sna);
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__sigev_thread_list_lock();
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/* Search a thread matching the required pthread_attr. */
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TAILQ_FOREACH(tn, &sigev_threads, tn_link) {
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if (sna.sna_stackaddr == NULL) {
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if (sna_eq(&tn->tn_sna, &sna))
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break;
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} else {
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/*
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* Reuse the thread if it has same stack address,
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* because two threads can not run on same stack.
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*/
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if (sna.sna_stackaddr == tn->tn_sna.sna_stackaddr)
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break;
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}
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}
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if (tn != NULL) {
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__sigev_thread_list_unlock();
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return (tn);
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}
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tn = malloc(sizeof(*tn));
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tn->tn_sna = sna;
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tn->tn_cur = NULL;
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TAILQ_INSERT_TAIL(&sigev_threads, tn, tn_link);
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sigemptyset(&set);
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sigaddset(&set, SIGEV_SIGSERVICE);
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_sigprocmask(SIG_BLOCK, &set, NULL);
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_pthread_cond_init(&tn->tn_cv, NULL);
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ret = pthread_create(&tn->tn_thread, pattr, sigev_service_loop, tn);
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_sigprocmask(SIG_UNBLOCK, &set, NULL);
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if (ret != 0) {
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TAILQ_REMOVE(&sigev_threads, tn, tn_link);
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__sigev_thread_list_unlock();
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_pthread_cond_destroy(&tn->tn_cv);
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free(tn);
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tn = NULL;
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} else {
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/* wait the thread to get its lwpid */
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_pthread_cond_wait(&tn->tn_cv, sigev_threads_mtx);
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__sigev_thread_list_unlock();
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}
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return (tn);
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}
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static void
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after_dispatch(struct sigev_thread_node *tn)
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{
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struct sigev_node *sn;
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if ((sn = tn->tn_cur) != NULL) {
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__sigev_list_lock();
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sn->sn_flags &= ~SNF_WORKING;
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if (sn->sn_flags & SNF_REMOVED)
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__sigev_free(sn);
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else if (sn->sn_flags & SNF_ONESHOT)
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__sigev_delete_node(sn);
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tn->tn_cur = NULL;
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__sigev_list_unlock();
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}
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}
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/*
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* This function is called if user callback calls
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* pthread_exit() or pthread_cancel() for the thread.
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*/
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static void
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thread_cleanup(void *arg)
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{
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struct sigev_thread_node *tn = arg;
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fprintf(stderr, "Dangerous Robinson, calling pthread_exit() from "
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"SIGEV_THREAD is undefined.");
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after_dispatch(tn);
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/* longjmp(tn->tn_jbuf, 1); */
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abort();
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}
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static void *
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sigev_service_loop(void *arg)
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{
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siginfo_t si;
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sigset_t set;
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struct sigev_thread_node *tn;
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struct sigev_node *sn;
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sigev_id_t id;
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tn = arg;
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thr_self(&tn->tn_lwpid);
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__sigev_list_lock();
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_pthread_cond_broadcast(&tn->tn_cv);
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__sigev_list_unlock();
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/*
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* Service thread should not be killed by callback, if user
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* attempts to do so, the thread will be restarted.
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*/
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setjmp(tn->tn_jbuf);
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
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sigemptyset(&set);
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sigaddset(&set, SIGEV_SIGSERVICE);
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pthread_cleanup_push(thread_cleanup, tn);
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for (;;) {
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if (__predict_false(sigwaitinfo(&set, &si) == -1))
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continue;
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id = sigev_get_id(&si);
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__sigev_list_lock();
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sn = __sigev_find(si.si_code, id);
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if (sn != NULL) {
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tn->tn_cur = sn;
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sn->sn_flags |= SNF_WORKING;
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__sigev_list_unlock();
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sn->sn_dispatch(sn, &si);
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after_dispatch(tn);
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} else
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tn->tn_cur = NULL;
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__sigev_list_unlock();
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}
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pthread_cleanup_pop(0);
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return (0);
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}
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