freebsd-dev/lib/libthr/thread/thr_info.c
Konstantin Belousov 4627d47bc8 Add pthread_get_name_np(3).
The function retrieves the thread name previously set by
pthread_set_name_np(3). The name is cached in the process memory.

Requested by:	Willem Jan Withagen <wjw@digiware.nl>
Man page update:	Yuri Pankov <yuripv@yuripv.net>
Reviewed by:	ian (previous version)
Discussed with:	arichardson, bjk (man page)
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D16702
2018-08-17 18:34:07 +00:00

112 lines
3.4 KiB
C

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
* Copyright (c) 2018 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by Konstantin Belousov
* under sponsorship from the FreeBSD Foundation.
*
* 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 of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <pthread_np.h>
#include "un-namespace.h"
#include "thr_private.h"
__weak_reference(_pthread_set_name_np, pthread_set_name_np);
static void
thr_set_name_np(struct pthread *thread, const char *name)
{
free(thread->name);
thread->name = strdup(name);
}
/* Set the thread name for debug. */
void
_pthread_set_name_np(pthread_t thread, const char *name)
{
struct pthread *curthread;
curthread = _get_curthread();
if (curthread == thread) {
THR_THREAD_LOCK(curthread, thread);
thr_set_name(thread->tid, name);
thr_set_name_np(thread, name);
THR_THREAD_UNLOCK(curthread, thread);
} else {
if (_thr_find_thread(curthread, thread, 0) == 0) {
if (thread->state != PS_DEAD) {
thr_set_name(thread->tid, name);
thr_set_name_np(thread, name);
}
THR_THREAD_UNLOCK(curthread, thread);
}
}
}
static void
thr_get_name_np(struct pthread *thread, char *buf, size_t len)
{
if (thread->name != NULL)
strlcpy(buf, thread->name, len);
else if (len > 0)
buf[0] = '\0';
}
__weak_reference(_pthread_get_name_np, pthread_get_name_np);
void
_pthread_get_name_np(pthread_t thread, char *buf, size_t len)
{
struct pthread *curthread;
curthread = _get_curthread();
if (curthread == thread) {
THR_THREAD_LOCK(curthread, thread);
thr_get_name_np(thread, buf, len);
THR_THREAD_UNLOCK(curthread, thread);
} else {
if (_thr_find_thread(curthread, thread, 0) == 0) {
if (thread->state != PS_DEAD)
thr_get_name_np(thread, buf, len);
THR_THREAD_UNLOCK(curthread, thread);
} else if (len > 0)
buf[0] = '\0';
}
}