freebsd-dev/lib/libc_r/uthread/uthread_info.c

/*
 * 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 REGENTS 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 <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#ifdef _THREAD_SAFE
#include <pthread.h>
#include <errno.h>
#include "pthread_private.h"

struct s_thread_info {
	enum pthread_state state;
	char           *name;
};

/* Static variables: */
static const struct s_thread_info thread_info[] = {
	{PS_RUNNING	, "Running"},
	{PS_SIGTHREAD	, "Waiting on signal thread"},
	{PS_MUTEX_WAIT	, "Waiting on a mutex"},
	{PS_COND_WAIT	, "Waiting on a condition variable"},
	{PS_FDLR_WAIT	, "Waiting for a file read lock"},
	{PS_FDLW_WAIT	, "Waiting for a file write lock"},
	{PS_FDR_WAIT	, "Waiting for read"},
	{PS_FDW_WAIT	, "Waiting for write"},
	{PS_FILE_WAIT	, "Waiting for FILE lock"},
	{PS_SELECT_WAIT	, "Waiting on select"},
	{PS_SLEEP_WAIT	, "Sleeping"},
	{PS_WAIT_WAIT	, "Waiting process"},
	{PS_SIGSUSPEND	, "Suspended, waiting for a signal"},
	{PS_SIGWAIT	, "Waiting for a signal"},
	{PS_SPINBLOCK	, "Waiting for a spinlock"},
	{PS_JOIN	, "Waiting to join"},
	{PS_SUSPENDED	, "Suspended"},
	{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;
	int             j;
	pthread_t       pthread;
	char		tmpfile[128];
	pq_list_t	*pq_list;

	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 = _thread_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");
		_thread_sys_write(fd, s, strlen(s));

		/* Enter a loop to report each thread in the global list: */
		for (pthread = _thread_link_list; pthread != NULL;
		    pthread = pthread->nxt) {
			/* Find the state: */
			for (j = 0; j < (sizeof(thread_info) /
			    sizeof(struct s_thread_info)) - 1; j++)
				if (thread_info[j].state == pthread->state)
					break;
			/* Output a record for the current thread: */
			snprintf(s, sizeof(s),
			    "--------------------\nThread %p (%s) prio %3d state %s [%s:%d]\n",
			    pthread, (pthread->name == NULL) ?
			    "":pthread->name, pthread->base_priority,
			    thread_info[j].name,
			    pthread->fname,pthread->lineno);
			_thread_sys_write(fd, s, strlen(s));

			/* Check if this is the running thread: */
			if (pthread == _thread_run) {
				/* Output a record for the running thread: */
				strcpy(s, "This is the running thread\n");
				_thread_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");
				_thread_sys_write(fd, s, strlen(s));
			}
			/* Process according to thread state: */
			switch (pthread->state) {
			/* File descriptor read lock wait: */
			case PS_FDLR_WAIT:
			case PS_FDLW_WAIT:
			case PS_FDR_WAIT:
			case PS_FDW_WAIT:
				/* Write the lock details: */
				snprintf(s, sizeof(s), "fd %d[%s:%d]",
				    pthread->data.fd.fd,
				    pthread->data.fd.fname,
				    pthread->data.fd.branch);
				_thread_sys_write(fd, s, strlen(s));
				snprintf(s, sizeof(s), "owner %pr/%pw\n",
				    _thread_fd_table[pthread->data.fd.fd]->r_owner,
				    _thread_fd_table[pthread->data.fd.fd]->w_owner);
				_thread_sys_write(fd, s, strlen(s));
				break;
			case PS_SIGWAIT:
				snprintf(s, sizeof(s), "sigmask 0x%08lx\n",
				    (unsigned long)pthread->sigmask);
				_thread_sys_write(fd, s, strlen(s));
				break;

			/*
			 * Trap other states that are not explicitly
			 * coded to dump information: 
			 */
			default:
				/* Nothing to do here. */
				break;
			}
		}

		/* Output a header for ready threads: */
		strcpy(s, "\n\n=============\nREADY THREADS\n\n");
		_thread_sys_write(fd, s, strlen(s));

		/* Enter a loop to report each thread in the ready queue: */
		TAILQ_FOREACH (pq_list, &_readyq.pq_queue, pl_link) {
			TAILQ_FOREACH(pthread, &pq_list->pl_head, pqe) {
				/* Find the state: */
				for (j = 0; j < (sizeof(thread_info) /
				    sizeof(struct s_thread_info)) - 1; j++)
					if (thread_info[j].state == pthread->state)
						break;
				/* Output a record for the current thread: */
				snprintf(s, sizeof(s),
				    "--------------------\nThread %p (%s) prio %3d state %s [%s:%d]\n",
				    pthread, (pthread->name == NULL) ?
				    "":pthread->name, pthread->base_priority,
				    thread_info[j].name,
				    pthread->fname,pthread->lineno);
				_thread_sys_write(fd, s, strlen(s));
			}
		}

		/* Output a header for waiting threads: */
		strcpy(s, "\n\n=============\nWAITING THREADS\n\n");
		_thread_sys_write(fd, s, strlen(s));

		/* Enter a loop to report each thread in the waiting queue: */
		TAILQ_FOREACH (pthread, &_waitingq, pqe) {
			/* Find the state: */
			for (j = 0; j < (sizeof(thread_info) /
			    sizeof(struct s_thread_info)) - 1; j++)
				if (thread_info[j].state == pthread->state)
					break;
			/* Output a record for the current thread: */
			snprintf(s, sizeof(s),
			    "--------------------\nThread %p (%s) prio %3d state %s [%s:%d]\n",
			    pthread, (pthread->name == NULL) ?
			    "":pthread->name, pthread->base_priority,
			    thread_info[j].name,
			    pthread->fname,pthread->lineno);
			_thread_sys_write(fd, s, strlen(s));
		}

		/* Check if there are no dead threads: */
		if (_thread_dead == NULL) {
			/* Output a record: */
			strcpy(s, "\n\nTHERE ARE NO DEAD THREADS\n");
			_thread_sys_write(fd, s, strlen(s));
		} else {
			/* Output a header for dead threads: */
			strcpy(s, "\n\nDEAD THREADS\n\n");
			_thread_sys_write(fd, s, strlen(s));

			/*
			 * Enter a loop to report each thread in the global
			 * dead thread list: 
			 */
			for (pthread = _thread_dead; pthread != NULL;
			    pthread = pthread->nxt_dead) {
				/* Output a record for the current thread: */
				snprintf(s, sizeof(s),
				    "Thread %p prio %3d [%s:%d]\n",
				    pthread, pthread->base_priority,
				    pthread->fname,pthread->lineno);
				_thread_sys_write(fd, s, strlen(s));
			}
		}

		/* Output a header for file descriptors: */
		snprintf(s, sizeof(s), "\n\n=============\nFILE DESCRIPTOR TABLE (table size %d)\n\n",_thread_dtablesize);
		_thread_sys_write(fd, s, strlen(s));

		/* Enter a loop to report file descriptor lock usage: */
		for (i = 0; i < _thread_dtablesize; i++) {
			/*
			 * Check if memory is allocated for this file
			 * descriptor: 
			 */
			if (_thread_fd_table[i] != NULL) {
				/* Report the file descriptor lock status: */
				snprintf(s, sizeof(s),
				    "fd[%3d] read owner %p count %d [%s:%d]\n        write owner %p count %d [%s:%d]\n",
					i,
					_thread_fd_table[i]->r_owner,
					_thread_fd_table[i]->r_lockcount,
					_thread_fd_table[i]->r_fname,
					_thread_fd_table[i]->r_lineno,
					_thread_fd_table[i]->w_owner,
					_thread_fd_table[i]->w_lockcount,
					_thread_fd_table[i]->w_fname,
					_thread_fd_table[i]->w_lineno);
				_thread_sys_write(fd, s, strlen(s));
			}
		}

		/* Close the dump file: */
		_thread_sys_close(fd);
	}
	return;
}

/* Set the thread name for debug: */
void
pthread_set_name_np(pthread_t thread, char *name)
{
	/* Check if the caller has specified a valid thread: */
	if (thread != NULL && thread->magic == PTHREAD_MAGIC)
		thread->name = strdup(name);
	return;
}
#endif