freebsd-dev/lib/libthr/thread/thr_info.c

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/*
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. 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.
*
* $FreeBSD$
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <errno.h>
#include "thr_private.h"
#ifndef NELEMENTS
#define NELEMENTS(arr) (sizeof(arr) / sizeof(arr[0]))
#endif
static void dump_thread(int fd, pthread_t pthread, int long_version);
__weak_reference(_pthread_set_name_np, pthread_set_name_np);
struct s_thread_info {
enum pthread_state state;
char *name;
};
/* Static variables: */
static const struct s_thread_info thread_info[] = {
{PS_RUNNING , "Running"},
{PS_MUTEX_WAIT , "Waiting on a mutex"},
{PS_COND_WAIT , "Waiting on a condition variable"},
{PS_SLEEP_WAIT , "Sleeping"},
{PS_WAIT_WAIT , "Waiting process"},
{PS_JOIN , "Waiting to join"},
{PS_DEAD , "Dead"},
{PS_DEADLOCK , "Deadlocked"},
{PS_STATE_MAX , "Not a real state!"}
};
void
_thread_dump_info(void)
{
char s[512];
int fd;
int i;
pthread_t pthread;
char tmpfile[128];
for (i = 0; i < 100000; i++) {
snprintf(tmpfile, sizeof(tmpfile), "/tmp/uthread.dump.%u.%i",
getpid(), i);
/* Open the dump file for append and create it if necessary: */
if ((fd = __sys_open(tmpfile, O_RDWR | O_CREAT | O_EXCL,
0666)) < 0) {
/* Can't open the dump file. */
if (errno == EEXIST)
continue;
/*
* We only need to continue in case of
* EEXIT error. Most other error
* codes means that we will fail all
* the times.
*/
return;
} else {
break;
}
}
if (i==100000) {
/* all 100000 possibilities are in use :( */
return;
} else {
/* Output a header for active threads: */
strcpy(s, "\n\n=============\nACTIVE THREADS\n\n");
__sys_write(fd, s, strlen(s));
/* Enter a loop to report each thread in the global list: */
TAILQ_FOREACH(pthread, &_thread_list, tle) {
dump_thread(fd, pthread, /*long_verson*/ 1);
}
/* Check if there are no dead threads: */
DEAD_LIST_LOCK;
if (TAILQ_FIRST(&_dead_list) == NULL) {
/* Output a record: */
strcpy(s, "\n\nTHERE ARE NO DEAD THREADS\n");
__sys_write(fd, s, strlen(s));
} else {
/* Output a header for dead threads: */
strcpy(s, "\n\nDEAD THREADS\n\n");
__sys_write(fd, s, strlen(s));
/*
* Enter a loop to report each thread in the global
* dead thread list:
*/
TAILQ_FOREACH(pthread, &_dead_list, dle) {
dump_thread(fd, pthread, /*long_version*/ 0);
}
}
DEAD_LIST_UNLOCK;
/* Close the dump file: */
__sys_close(fd);
}
}
static void
dump_thread(int fd, pthread_t pthread, int long_version)
{
char s[512];
int i;
/* Find the state: */
for (i = 0; i < NELEMENTS(thread_info) - 1; i++)
if (thread_info[i].state == pthread->state)
break;
/* Output a record for the thread: */
snprintf(s, sizeof(s),
"--------------------\nThread %p (%s) prio %3d state %s [%s:%d]\n",
pthread, (pthread->name == NULL) ? "" : pthread->name,
pthread->active_priority, thread_info[i].name, pthread->fname,
pthread->lineno);
__sys_write(fd, s, strlen(s));
if (long_version != 0) {
/* Check if this is the running thread: */
if (pthread == curthread) {
/* Output a record for the running thread: */
strcpy(s, "This is the running thread\n");
__sys_write(fd, s, strlen(s));
}
/* Check if this is the initial thread: */
if (pthread == _thread_initial) {
/* Output a record for the initial thread: */
strcpy(s, "This is the initial thread\n");
__sys_write(fd, s, strlen(s));
}
/* Process according to thread state: */
switch (pthread->state) {
/*
* Trap other states that are not explicitly
* coded to dump information:
*/
default:
/* Nothing to do here. */
break;
}
}
}
/* Set the thread name for debug: */
void
_pthread_set_name_np(pthread_t thread, const char *name)
{
/* Check if the caller has specified a valid thread: */
if (thread != NULL && thread->magic == PTHREAD_MAGIC) {
if (thread->name != NULL) {
/* Free space for previous name. */
free(thread->name);
}
thread->name = strdup(name);
}
}