b5a8a15c2f
file descriptors needing to be polled (Doh!). Reported
by Dan Nelson <dnelson@emsphone.com>.
Don't install and start the scheduling timer until the
first thread is created. This prevents the overhead of
having a periodic scheduling signal in a single threaded
program. Reported by Dan Nelson <dnelson@emsphone.com>.
Allow builtin longjmps out of application installed
signal handlers without the need perform any post-handler
cleanup:
o Change signal handling to save the threads interrupted
context on the stack. The threads current context is
now always stored in the same place (in the pthread).
If and when a signal handler returns, the interrupted
context is copied back to the storage area in the pthread.
o Before calling invoking a signal handler for a thread,
back the thread out of any internal waiting queues
(mutex, CV, join, etc) to which it belongs.
Rework uthread_info.c a bit to make it easier to change
the format of a thread dump.
Use an alternal signal stack for the thread library's
signal handler. This allows us to fiddle with the main
threads stack without fear of it being in use.
Reviewed by: jasone
291 lines
9.0 KiB
C
291 lines
9.0 KiB
C
/*
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* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
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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, this list of conditions and the following 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef _THREAD_SAFE
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#include <pthread.h>
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#include <errno.h>
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#include "pthread_private.h"
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#ifndef NELEMENTS
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#define NELEMENTS(arr) (sizeof(arr) / sizeof(arr[0]))
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#endif
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static void dump_thread(int fd, pthread_t pthread, int long_version);
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struct s_thread_info {
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enum pthread_state state;
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char *name;
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};
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/* Static variables: */
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static const struct s_thread_info thread_info[] = {
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{PS_RUNNING , "Running"},
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{PS_SIGTHREAD , "Waiting on signal thread"},
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{PS_MUTEX_WAIT , "Waiting on a mutex"},
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{PS_COND_WAIT , "Waiting on a condition variable"},
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{PS_FDLR_WAIT , "Waiting for a file read lock"},
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{PS_FDLW_WAIT , "Waiting for a file write lock"},
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{PS_FDR_WAIT , "Waiting for read"},
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{PS_FDW_WAIT , "Waiting for write"},
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{PS_FILE_WAIT , "Waiting for FILE lock"},
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{PS_POLL_WAIT , "Waiting on poll"},
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{PS_SELECT_WAIT , "Waiting on select"},
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{PS_SLEEP_WAIT , "Sleeping"},
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{PS_WAIT_WAIT , "Waiting process"},
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{PS_SIGSUSPEND , "Suspended, waiting for a signal"},
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{PS_SIGWAIT , "Waiting for a signal"},
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{PS_SPINBLOCK , "Waiting for a spinlock"},
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{PS_JOIN , "Waiting to join"},
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{PS_SUSPENDED , "Suspended"},
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{PS_DEAD , "Dead"},
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{PS_DEADLOCK , "Deadlocked"},
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{PS_STATE_MAX , "Not a real state!"}
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};
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void
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_thread_dump_info(void)
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{
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char s[512];
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int fd;
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int i;
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pthread_t pthread;
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char tmpfile[128];
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pq_list_t *pq_list;
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for (i = 0; i < 100000; i++) {
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snprintf(tmpfile, sizeof(tmpfile), "/tmp/uthread.dump.%u.%i",
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getpid(), i);
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/* Open the dump file for append and create it if necessary: */
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if ((fd = _thread_sys_open(tmpfile, O_RDWR | O_CREAT | O_EXCL,
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0666)) < 0) {
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/* Can't open the dump file. */
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if (errno == EEXIST)
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continue;
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/*
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* We only need to continue in case of
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* EEXIT error. Most other error
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* codes means that we will fail all
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* the times.
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*/
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return;
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} else {
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break;
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}
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}
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if (i==100000) {
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/* all 100000 possibilities are in use :( */
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return;
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} else {
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/* Output a header for active threads: */
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strcpy(s, "\n\n=============\nACTIVE THREADS\n\n");
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_thread_sys_write(fd, s, strlen(s));
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/* Enter a loop to report each thread in the global list: */
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TAILQ_FOREACH(pthread, &_thread_list, tle) {
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dump_thread(fd, pthread, /*long_verson*/ 1);
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}
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/* Output a header for ready threads: */
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strcpy(s, "\n\n=============\nREADY THREADS\n\n");
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_thread_sys_write(fd, s, strlen(s));
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/* Enter a loop to report each thread in the ready queue: */
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TAILQ_FOREACH (pq_list, &_readyq.pq_queue, pl_link) {
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TAILQ_FOREACH(pthread, &pq_list->pl_head, pqe) {
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dump_thread(fd, pthread, /*long_version*/ 0);
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}
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}
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/* Output a header for waiting threads: */
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strcpy(s, "\n\n=============\nWAITING THREADS\n\n");
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_thread_sys_write(fd, s, strlen(s));
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/* Enter a loop to report each thread in the waiting queue: */
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TAILQ_FOREACH (pthread, &_waitingq, pqe) {
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dump_thread(fd, pthread, /*long_version*/ 0);
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}
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/* Output a header for threads in the work queue: */
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strcpy(s, "\n\n=============\nTHREADS IN WORKQ\n\n");
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_thread_sys_write(fd, s, strlen(s));
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/* Enter a loop to report each thread in the waiting queue: */
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TAILQ_FOREACH (pthread, &_workq, qe) {
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dump_thread(fd, pthread, /*long_version*/ 0);
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}
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/* Check if there are no dead threads: */
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if (TAILQ_FIRST(&_dead_list) == NULL) {
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/* Output a record: */
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strcpy(s, "\n\nTHERE ARE NO DEAD THREADS\n");
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_thread_sys_write(fd, s, strlen(s));
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} else {
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/* Output a header for dead threads: */
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strcpy(s, "\n\nDEAD THREADS\n\n");
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_thread_sys_write(fd, s, strlen(s));
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/*
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* Enter a loop to report each thread in the global
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* dead thread list:
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*/
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TAILQ_FOREACH(pthread, &_dead_list, dle) {
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dump_thread(fd, pthread, /*long_version*/ 0);
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}
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}
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/* Output a header for file descriptors: */
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snprintf(s, sizeof(s), "\n\n=============\nFILE DESCRIPTOR "
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"TABLE (table size %d)\n\n", _thread_dtablesize);
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_thread_sys_write(fd, s, strlen(s));
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/* Enter a loop to report file descriptor lock usage: */
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for (i = 0; i < _thread_dtablesize; i++) {
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/*
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* Check if memory is allocated for this file
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* descriptor:
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*/
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if (_thread_fd_table[i] != NULL) {
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/* Report the file descriptor lock status: */
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snprintf(s, sizeof(s),
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"fd[%3d] read owner %p count %d [%s:%d]\n"
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" write owner %p count %d [%s:%d]\n",
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i, _thread_fd_table[i]->r_owner,
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_thread_fd_table[i]->r_lockcount,
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_thread_fd_table[i]->r_fname,
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_thread_fd_table[i]->r_lineno,
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_thread_fd_table[i]->w_owner,
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_thread_fd_table[i]->w_lockcount,
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_thread_fd_table[i]->w_fname,
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_thread_fd_table[i]->w_lineno);
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_thread_sys_write(fd, s, strlen(s));
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}
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}
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/* Close the dump file: */
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_thread_sys_close(fd);
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}
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}
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static void
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dump_thread(int fd, pthread_t pthread, int long_version)
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{
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char s[512];
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int i;
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/* Find the state: */
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for (i = 0; i < NELEMENTS(thread_info) - 1; i++)
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if (thread_info[i].state == pthread->state)
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break;
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/* Output a record for the thread: */
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snprintf(s, sizeof(s),
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"--------------------\nThread %p (%s) prio %3d state %s [%s:%d]\n",
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pthread, (pthread->name == NULL) ? "" : pthread->name,
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pthread->active_priority, thread_info[i].name, pthread->fname,
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pthread->lineno);
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_thread_sys_write(fd, s, strlen(s));
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if (long_version != 0) {
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/* Check if this is the running thread: */
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if (pthread == _thread_run) {
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/* Output a record for the running thread: */
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strcpy(s, "This is the running thread\n");
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_thread_sys_write(fd, s, strlen(s));
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}
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/* Check if this is the initial thread: */
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if (pthread == _thread_initial) {
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/* Output a record for the initial thread: */
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strcpy(s, "This is the initial thread\n");
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_thread_sys_write(fd, s, strlen(s));
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}
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/* Process according to thread state: */
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switch (pthread->state) {
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/* File descriptor read lock wait: */
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case PS_FDLR_WAIT:
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case PS_FDLW_WAIT:
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case PS_FDR_WAIT:
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case PS_FDW_WAIT:
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/* Write the lock details: */
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snprintf(s, sizeof(s), "fd %d[%s:%d]",
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pthread->data.fd.fd,
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pthread->data.fd.fname,
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pthread->data.fd.branch);
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_thread_sys_write(fd, s, strlen(s));
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snprintf(s, sizeof(s), "owner %pr/%pw\n",
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_thread_fd_table[pthread->data.fd.fd]->r_owner,
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_thread_fd_table[pthread->data.fd.fd]->w_owner);
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_thread_sys_write(fd, s, strlen(s));
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break;
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case PS_SIGWAIT:
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snprintf(s, sizeof(s), "sigmask (hi)");
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_thread_sys_write(fd, s, strlen(s));
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for (i = _SIG_WORDS - 1; i >= 0; i--) {
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snprintf(s, sizeof(s), "%08x\n",
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pthread->sigmask.__bits[i]);
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_thread_sys_write(fd, s, strlen(s));
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}
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snprintf(s, sizeof(s), "(lo)\n");
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_thread_sys_write(fd, s, strlen(s));
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break;
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/*
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* Trap other states that are not explicitly
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* coded to dump information:
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*/
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default:
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/* Nothing to do here. */
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break;
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}
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}
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}
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/* Set the thread name for debug: */
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void
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pthread_set_name_np(pthread_t thread, char *name)
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{
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/* Check if the caller has specified a valid thread: */
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if (thread != NULL && thread->magic == PTHREAD_MAGIC) {
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if (thread->name != NULL) {
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/* Free space for previous name. */
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free(thread->name);
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}
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thread->name = strdup(name);
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}
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}
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#endif
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