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/*
* ivykis, an event handling library
* Copyright (C) 2010 Lennert Buytenhek
* Dedicated to Marija Kulikova.
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version
* 2.1 as published by the Free Software Foundation.
*
* This library 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 Lesser General Public License version 2.1 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License version 2.1 along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <iv.h>
#include <iv_event.h>
#include <iv_thread.h>
#include <iv_tls.h>
#include <pthread.h>
#include <string.h>
#include <sys/syscall.h>
/* gettid *******************************************************************/
#ifdef __FreeBSD__
/* Older FreeBSDs (6.1) don't include ucontext.h in thr.h. */
#include <sys/ucontext.h>
#include <sys/thr.h>
#endif
static pid_t gettid(void)
{
pid_t tid;
tid = 0;
#ifdef __NR_gettid
tid = syscall(__NR_gettid);
#elif defined(__FreeBSD__)
long thr;
thr_self(&thr);
tid = (pid_t)thr;
#endif
return tid;
}
/* data structures and global data ******************************************/
struct iv_thread {
struct iv_list_head list;
pthread_t thread_id;
struct iv_event dead;
char *name;
pid_t tid;
void (*start_routine)(void *);
void *arg;
};
static int iv_thread_debug;
/* tls **********************************************************************/
struct iv_thread_thr_info {
struct iv_list_head child_threads;
};
static void iv_thread_tls_init_thread(void *_tinfo)
{
struct iv_thread_thr_info *tinfo = _tinfo;
INIT_IV_LIST_HEAD(&tinfo->child_threads);
}
static void iv_thread_tls_deinit_thread(void *_tinfo)
{
struct iv_thread_thr_info *tinfo = _tinfo;
struct iv_list_head *ilh;
iv_list_for_each (ilh, &tinfo->child_threads) {
struct iv_thread *thr;
thr = iv_list_entry(ilh, struct iv_thread, list);
pthread_detach(thr->thread_id);
}
}
static struct iv_tls_user iv_thread_tls_user = {
.sizeof_state = sizeof(struct iv_thread_thr_info),
.init_thread = iv_thread_tls_init_thread,
.deinit_thread = iv_thread_tls_deinit_thread,
};
static void iv_thread_tls_init(void) __attribute__((constructor));
static void iv_thread_tls_init(void)
{
iv_tls_user_register(&iv_thread_tls_user);
}
/* callee thread ************************************************************/
static void iv_thread_cleanup_handler(void *_thr)
{
struct iv_thread *thr = _thr;
if (iv_thread_debug)
fprintf(stderr, "iv_thread: [%s] was canceled\n", thr->name);
iv_event_post(&thr->dead);
}
static void *iv_thread_handler(void *_thr)
{
struct iv_thread *thr = _thr;
thr->tid = gettid();
pthread_cleanup_push(iv_thread_cleanup_handler, thr);
thr->start_routine(thr->arg);
pthread_cleanup_pop(0);
if (iv_thread_debug)
fprintf(stderr, "iv_thread: [%s] terminating normally\n",
thr->name);
iv_event_post(&thr->dead);
return NULL;
}
/* calling thread ***********************************************************/
static void iv_thread_died(void *_thr)
{
struct iv_thread *thr = _thr;
pthread_join(thr->thread_id, NULL);
if (iv_thread_debug)
fprintf(stderr, "iv_thread: [%s] joined\n", thr->name);
iv_list_del(&thr->list);
iv_event_unregister(&thr->dead);
free(thr->name);
free(thr);
}
int iv_thread_create(char *name, void (*start_routine)(void *), void *arg)
{
struct iv_thread_thr_info *tinfo = iv_tls_user_ptr(&iv_thread_tls_user);
struct iv_thread *thr;
int ret;
thr = malloc(sizeof(*thr));
if (thr == NULL)
return -1;
IV_EVENT_INIT(&thr->dead);
thr->dead.cookie = thr;
thr->dead.handler = iv_thread_died;
iv_event_register(&thr->dead);
thr->name = strdup(name);
thr->tid = 0;
thr->start_routine = start_routine;
thr->arg = arg;
ret = pthread_create(&thr->thread_id, NULL, iv_thread_handler, thr);
if (ret)
goto out;
iv_list_add_tail(&thr->list, &tinfo->child_threads);
if (iv_thread_debug)
fprintf(stderr, "iv_thread: [%s] started\n", name);
return 0;
out:
iv_event_unregister(&thr->dead);
free(thr->name);
free(thr);
if (iv_thread_debug)
fprintf(stderr, "iv_thread: [%s] failed to start\n", name);
return -1;
}
void iv_thread_set_debug_state(int state)
{
iv_thread_debug = !!state;
}
void iv_thread_list_children(void)
{
struct iv_thread_thr_info *tinfo = iv_tls_user_ptr(&iv_thread_tls_user);
struct iv_list_head *ilh;
fprintf(stderr, "tid\tname\n");
fprintf(stderr, "%d\tself\n", (int)gettid());
iv_list_for_each (ilh, &tinfo->child_threads) {
struct iv_thread *thr;
thr = iv_list_entry(ilh, struct iv_thread, list);
fprintf(stderr, "%d\t%s\n", (int)thr->tid, thr->name);
}
}
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