lib/libthread_xu/thread/thr_info.c

   1 /*
   2  * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by John Birrell.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/lib/libpthread/thread/thr_info.c,v 1.27 2003/09/22 00:40:23 davidxu Exp $
  33  * $DragonFly: src/lib/libthread_xu/thread/thr_info.c,v 1.1 2005/02/01 12:38:27 davidxu Exp $
  34  */
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <fcntl.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40 #include <pthread.h>
  41 #include <errno.h>
  42 #include "thr_private.h"
  43
  44 #ifndef NELEMENTS
  45 #define NELEMENTS(arr)  (sizeof(arr) / sizeof(arr[0]))
  46 #endif
  47
  48 static void     dump_thread(int fd, pthread_t pthread, int long_version);
  49
  50 __weak_reference(_pthread_set_name_np, pthread_set_name_np);
  51
  52 struct s_thread_info {
  53         enum pthread_state state;
  54         char           *name;
  55 };
  56
  57 /* Static variables: */
  58 static const struct s_thread_info thread_info[] = {
  59         {PS_RUNNING     , "Running"},
  60         {PS_MUTEX_WAIT  , "Waiting on a mutex"},
  61         {PS_JOIN        , "Waiting to join"},
  62         {PS_SUSPENDED   , "Suspended"},
  63         {PS_DEAD        , "Dead"},
  64         {PS_DEADLOCK    , "Deadlocked"},
  65         {PS_STATE_MAX   , "Not a real state!"}
  66 };
  67
  68 void
  69 _thread_dump_info(void)
  70 {
  71         char s[512], tmpfile[128];
  72         pthread_t pthread;
  73         int fd, i;
  74
  75         for (i = 0; i < 100000; i++) {
  76                 snprintf(tmpfile, sizeof(tmpfile), "/tmp/pthread.dump.%u.%i",
  77                         getpid(), i);
  78                 /* Open the dump file for append and create it if necessary: */
  79                 if ((fd = __sys_open(tmpfile, O_RDWR | O_CREAT | O_EXCL,
  80                         0666)) < 0) {
  81                                 /* Can't open the dump file. */
  82                                 if (errno == EEXIST)
  83                                         continue;
  84                                 /*
  85                                  * We only need to continue in case of
  86                                  * EEXIT error. Most other error
  87                                  * codes means that we will fail all
  88                                  * the times.
  89                                  */
  90                                 return;
  91                 } else {
  92                         break;
  93                 }
  94         }
  95         if (i==100000) {
  96                 /* all 100000 possibilities are in use :( */
  97                 return;
  98         } else {
  99                 /* Dump the active threads. */
 100                 strcpy(s, "\n\n========\nACTIVE THREADS\n\n");
 101                 __sys_write(fd, s, strlen(s));
 102
 103                 /* Enter a loop to report each thread in the global list: */
 104                 TAILQ_FOREACH(pthread, &_thread_list, tle) {
 105                         if (pthread->state != PS_DEAD)
 106                                 dump_thread(fd, pthread, /*long_verson*/ 1);
 107                 }
 108
 109                 /*
 110                  * Dump the ready threads.
 111                  * XXX - We can't easily do this because the run queues
 112                  *       are per-KSEG.
 113                  */
 114                 strcpy(s, "\n\n========\nREADY THREADS - unimplemented\n\n");
 115                 __sys_write(fd, s, strlen(s));
 116
 117
 118                 /*
 119                  * Dump the waiting threads.
 120                  * XXX - We can't easily do this because the wait queues
 121                  *       are per-KSEG.
 122                  */
 123                 strcpy(s, "\n\n========\nWAITING THREADS - unimplemented\n\n");
 124                 __sys_write(fd, s, strlen(s));
 125
 126                 /* Close the dump file. */
 127                 __sys_close(fd);
 128         }
 129 }
 130
 131 static void
 132 dump_thread(int fd, pthread_t pthread, int long_version)
 133 {
 134         struct pthread *curthread = _get_curthread();
 135         char s[512];
 136         int i;
 137
 138         /* Find the state: */
 139         for (i = 0; i < NELEMENTS(thread_info) - 1; i++)
 140                 if (thread_info[i].state == pthread->state)
 141                         break;
 142
 143         /* Output a record for the thread: */
 144         snprintf(s, sizeof(s),
 145             "--------------------\n"
 146             "Thread %p (%s), scope %s, prio %3d, state %s [%s:%d]\n",
 147             pthread, (pthread->name == NULL) ? "" : pthread->name,
 148             pthread->attr.flags & PTHREAD_SCOPE_SYSTEM ? "system" : "process",
 149             pthread->active_priority,
 150             thread_info[i].name, pthread->fname, pthread->lineno);
 151         __sys_write(fd, s, strlen(s));
 152
 153         if (long_version != 0) {
 154                 /* Check if this is the running thread: */
 155                 if (pthread == curthread) {
 156                         /* Output a record for the running thread: */
 157                         strcpy(s, "This is the running thread\n");
 158                         __sys_write(fd, s, strlen(s));
 159                 }
 160                 /* Check if this is the initial thread: */
 161                 if (pthread == _thr_initial) {
 162                         /* Output a record for the initial thread: */
 163                         strcpy(s, "This is the initial thread\n");
 164                         __sys_write(fd, s, strlen(s));
 165                 }
 166
 167                 /* Process according to thread state: */
 168                 switch (pthread->state) {
 169                 /*
 170                  * Trap other states that are not explicitly
 171                  * coded to dump information:
 172                  */
 173                 default:
 174                         snprintf(s, sizeof(s), "sigmask (hi) ");
 175                         __sys_write(fd, s, strlen(s));
 176                         for (i = _SIG_WORDS - 1; i >= 0; i--) {
 177                                 snprintf(s, sizeof(s), "%08x ",
 178                                     pthread->sigmask.__bits[i]);
 179                                 __sys_write(fd, s, strlen(s));
 180                         }
 181                         snprintf(s, sizeof(s), "(lo)\n");
 182                         __sys_write(fd, s, strlen(s));
 183                         break;
 184                 }
 185         }
 186 }
 187
 188 /* Set the thread name for debug: */
 189 void
 190 _pthread_set_name_np(pthread_t thread, char *name)
 191 {
 192         /* Check if the caller has specified a valid thread: */
 193         if (thread != NULL && thread->magic == THR_MAGIC) {
 194                 if (thread->name != NULL) {
 195                         /* Free space for previous name. */
 196                         free(thread->name);
 197                 }
 198                 thread->name = strdup(name);
 199         }
 200 }