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  * $DragonFly: src/lib/libthread_xu/thread/thr_info.c,v 1.4 2006/04/06 13:03:09 davidxu Exp $
  33  */
  34
  35 #include "namespace.h"
  36 #include <machine/tls.h>
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <fcntl.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include <pthread.h>
  44 #include <errno.h>
  45 #include "un-namespace.h"
  46
  47 #include "thr_private.h"
  48
  49 #ifndef NELEMENTS
  50 #define NELEMENTS(arr)  (sizeof(arr) / sizeof(arr[0]))
  51 #endif
  52
  53 static void     dump_thread(int fd, pthread_t pthread, int long_version);
  54
  55 struct s_thread_info {
  56         enum pthread_state state;
  57         char           *name;
  58 };
  59
  60 /* Static variables: */
  61 static const struct s_thread_info thread_info[] = {
  62         {PS_RUNNING     , "Running"},
  63         {PS_MUTEX_WAIT  , "Waiting on a mutex"},
  64         {PS_JOIN        , "Waiting to join"},
  65         {PS_SUSPENDED   , "Suspended"},
  66         {PS_DEAD        , "Dead"},
  67         {PS_DEADLOCK    , "Deadlocked"},
  68         {PS_STATE_MAX   , "Not a real state!"}
  69 };
  70
  71 void
  72 _thread_dump_info(void)
  73 {
  74         char s[512], tmpfile[128];
  75         pthread_t pthread;
  76         int fd, i;
  77
  78         for (i = 0; i < 100000; i++) {
  79                 snprintf(tmpfile, sizeof(tmpfile), "/tmp/pthread.dump.%u.%i",
  80                         getpid(), i);
  81                 /* Open the dump file for append and create it if necessary: */
  82                 if ((fd = __sys_open(tmpfile, O_RDWR | O_CREAT | O_EXCL,
  83                         0666)) < 0) {
  84                                 /* Can't open the dump file. */
  85                                 if (errno == EEXIST)
  86                                         continue;
  87                                 /*
  88                                  * We only need to continue in case of
  89                                  * EEXIT error. Most other error
  90                                  * codes means that we will fail all
  91                                  * the times.
  92                                  */
  93                                 return;
  94                 } else {
  95                         break;
  96                 }
  97         }
  98         if (i==100000) {
  99                 /* all 100000 possibilities are in use :( */
 100                 return;
 101         } else {
 102                 /* Dump the active threads. */
 103                 strcpy(s, "\n\n========\nACTIVE THREADS\n\n");
 104                 __sys_write(fd, s, strlen(s));
 105
 106                 /* Enter a loop to report each thread in the global list: */
 107                 TAILQ_FOREACH(pthread, &_thread_list, tle) {
 108                         if (pthread->state != PS_DEAD)
 109                                 dump_thread(fd, pthread, /*long_verson*/ 1);
 110                 }
 111
 112                 /*
 113                  * Dump the ready threads.
 114                  * XXX - We can't easily do this because the run queues
 115                  *       are per-KSEG.
 116                  */
 117                 strcpy(s, "\n\n========\nREADY THREADS - unimplemented\n\n");
 118                 __sys_write(fd, s, strlen(s));
 119
 120
 121                 /*
 122                  * Dump the waiting threads.
 123                  * XXX - We can't easily do this because the wait queues
 124                  *       are per-KSEG.
 125                  */
 126                 strcpy(s, "\n\n========\nWAITING THREADS - unimplemented\n\n");
 127                 __sys_write(fd, s, strlen(s));
 128
 129                 /* Close the dump file. */
 130                 __sys_close(fd);
 131         }
 132 }
 133
 134 static void
 135 dump_thread(int fd, pthread_t pthread, int long_version)
 136 {
 137         struct pthread *curthread = tls_get_curthread();
 138         char s[512];
 139         int i;
 140
 141         /* Find the state: */
 142         for (i = 0; i < NELEMENTS(thread_info) - 1; i++)
 143                 if (thread_info[i].state == pthread->state)
 144                         break;
 145
 146         /* Output a record for the thread: */
 147         snprintf(s, sizeof(s),
 148             "--------------------\n"
 149             "Thread %p (%s), scope %s, prio %3d, state %s [%s:%d]\n",
 150             pthread, (pthread->name == NULL) ? "" : pthread->name,
 151             pthread->attr.flags & PTHREAD_SCOPE_SYSTEM ? "system" : "process",
 152             pthread->active_priority,
 153             thread_info[i].name, pthread->fname, pthread->lineno);
 154         __sys_write(fd, s, strlen(s));
 155
 156         if (long_version != 0) {
 157                 /* Check if this is the running thread: */
 158                 if (pthread == curthread) {
 159                         /* Output a record for the running thread: */
 160                         strcpy(s, "This is the running thread\n");
 161                         __sys_write(fd, s, strlen(s));
 162                 }
 163                 /* Check if this is the initial thread: */
 164                 if (pthread == _thr_initial) {
 165                         /* Output a record for the initial thread: */
 166                         strcpy(s, "This is the initial thread\n");
 167                         __sys_write(fd, s, strlen(s));
 168                 }
 169
 170                 /* Process according to thread state: */
 171                 switch (pthread->state) {
 172                 /*
 173                  * Trap other states that are not explicitly
 174                  * coded to dump information:
 175                  */
 176                 default:
 177                         snprintf(s, sizeof(s), "sigmask (hi) ");
 178                         __sys_write(fd, s, strlen(s));
 179                         for (i = _SIG_WORDS - 1; i >= 0; i--) {
 180                                 snprintf(s, sizeof(s), "%08x ",
 181                                     pthread->sigmask.__bits[i]);
 182                                 __sys_write(fd, s, strlen(s));
 183                         }
 184                         snprintf(s, sizeof(s), "(lo)\n");
 185                         __sys_write(fd, s, strlen(s));
 186                         break;
 187                 }
 188         }
 189 }
 190
 191 /* Set the thread name for debug: */
 192 void
 193 _pthread_set_name_np(pthread_t thread, char *name)
 194 {
 195         /* Check if the caller has specified a valid thread: */
 196         if (thread != NULL && thread->magic == THR_MAGIC) {
 197                 if (thread->name != NULL) {
 198                         /* Free space for previous name. */
 199                         free(thread->name);
 200                 }
 201                 thread->name = strdup(name);
 202         }
 203 }
 204
 205 __strong_reference(_pthread_set_name_np, pthread_set_name_np);