a772047bc6
signals were changed in kernel, it will retrieve the pending set and try to find a thread to dispatch the signal. The dispatching process can be rolled back if the signal is no longer in kernel. o Create two functions _thr_signal_init() and _thr_signal_deinit(), all signal action settings are retrieved from kernel when threading mode is turned on, after a fork(), child process will reset them to user settings by calling _thr_signal_deinit(). when threading mode is not turned on, all signal operations are direct past to kernel. o When a thread generated a synchoronous signals and its context returned from completed list, UTS will retrieve the signal from its mailbox and try to deliver the signal to thread. o Context signal mask is now only used when delivering signals, thread's current signal mask is always the one in pthread structure. o Remove have_signals field in pthread structure, replace it with psf_valid in pthread_signal_frame. when psf_valid is true, in context switch time, thread will backout itself from some mutex/condition internal queues, then begin to process signals. when a thread is not at blocked state and running, check_pending indicates there are signals for the thread, after preempted and then resumed time, UTS will try to deliver signals to the thread. o At signal delivering time, not only pending signals in thread will be scanned, process's pending signals will be scanned too. o Change sigwait code a bit, remove field sigwait in pthread_wait_data, replace it with oldsigmask in pthread structure, when a thread calls sigwait(), its current signal mask is backuped to oldsigmask, and waitset is copied to its signal mask and when the thread gets a signal in the waitset range, its current signal mask is restored from oldsigmask, these are done in atomic fashion. o Two additional POSIX APIs are implemented, sigwaitinfo() and sigtimedwait(). o Signal code locking is better than previous, there is fewer race conditions. o Temporary disable most of code in _kse_single_thread as it is not safe after fork().
221 lines
6.7 KiB
C
221 lines
6.7 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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#include <pthread.h>
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#include <errno.h>
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#include "thr_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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__weak_reference(_pthread_set_name_np, pthread_set_name_np);
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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_LOCKWAIT , "Waiting on an internal lock"},
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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_SLEEP_WAIT , "Sleeping"},
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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_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], tmpfile[128];
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pthread_t pthread;
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int fd, i;
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for (i = 0; i < 100000; i++) {
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snprintf(tmpfile, sizeof(tmpfile), "/tmp/pthread.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 = __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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/* Dump the active threads. */
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strcpy(s, "\n\n========\nACTIVE THREADS\n\n");
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__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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if (pthread->state != PS_DEAD)
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dump_thread(fd, pthread, /*long_verson*/ 1);
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}
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/*
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* Dump the ready threads.
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* XXX - We can't easily do this because the run queues
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* are per-KSEG.
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*/
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strcpy(s, "\n\n========\nREADY THREADS - unimplemented\n\n");
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__sys_write(fd, s, strlen(s));
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/*
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* Dump the waiting threads.
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* XXX - We can't easily do this because the wait queues
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* are per-KSEG.
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*/
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strcpy(s, "\n\n========\nWAITING THREADS - unimplemented\n\n");
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__sys_write(fd, s, strlen(s));
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/* Close the dump file. */
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__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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struct pthread *curthread = _get_curthread();
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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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"--------------------\n"
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"Thread %p (%s) prio %3d, blocked %s, state %s [%s:%d]\n",
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pthread, (pthread->name == NULL) ? "" : pthread->name,
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pthread->active_priority, (pthread->blocked != 0) ? "yes" : "no",
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thread_info[i].name, pthread->fname, pthread->lineno);
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__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 == curthread) {
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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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__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 == _thr_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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__sys_write(fd, s, strlen(s));
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}
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/* Check if this is the signal daemon thread: */
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if (pthread == _thr_sig_daemon) {
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/* Output a record for the signal thread: */
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strcpy(s, "This is the signal daemon thread\n");
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__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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case PS_SIGWAIT:
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snprintf(s, sizeof(s), "sigmask (hi)");
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__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->oldsigmask.__bits[i]);
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__sys_write(fd, s, strlen(s));
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}
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snprintf(s, sizeof(s), "(lo)\n");
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__sys_write(fd, s, strlen(s));
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snprintf(s, sizeof(s), "waitset (hi)");
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__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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__sys_write(fd, s, strlen(s));
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}
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snprintf(s, sizeof(s), "(lo)\n");
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__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 == THR_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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