e5106342c6
_foo - wrapped system call foo - weak definition to _foo and for cancellation points: _foo - wrapped system call __foo - enter cancellation point, call _foo(), leave cancellation point foo - weak definition to __foo Change use of global _thread_run to call a function to get the currently running thread. Make all pthread_foo functions weak definitions to _pthread_foo, where _pthread_foo is the implementation. This allows an application to provide its own pthread functions. Provide slightly different versions of pthread_mutex_lock and pthread_mutex_init so that we can tell the difference between a libc mutex and an application mutex. Threads holding mutexes internal to libc should never be allowed to exit, call signal handlers, or cancel. Approved by: -arch
485 lines
14 KiB
C
485 lines
14 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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/* Allocate space for global thread variables here: */
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#define GLOBAL_PTHREAD_PRIVATE
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/types.h>
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#include <machine/reg.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <sys/event.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/ttycom.h>
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#include <sys/user.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <poll.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "un-namespace.h"
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#include "pthread_private.h"
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/*
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* All weak references used within libc should be in this table.
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* This will is so that static libraries will work.
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*/
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static void *references[] = {
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&_accept,
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&_bind,
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&_close,
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&_connect,
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&_dup,
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&_dup2,
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&_execve,
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&_fcntl,
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&_flock,
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&_flockfile,
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&_fstat,
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&_fstatfs,
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&_fsync,
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&_funlockfile,
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&_getdirentries,
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&_getlogin,
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&_getpeername,
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&_getsockname,
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&_getsockopt,
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&_ioctl,
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&_kevent,
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&_listen,
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&_nanosleep,
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&_open,
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&_pthread_getspecific,
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&_pthread_key_create,
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&_pthread_key_delete,
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&_pthread_mutex_destroy,
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&_pthread_mutex_init,
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&_pthread_mutex_lock,
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&_pthread_mutex_trylock,
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&_pthread_mutex_unlock,
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&_pthread_mutexattr_init,
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&_pthread_mutexattr_destroy,
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&_pthread_mutexattr_settype,
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&_pthread_once,
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&_pthread_setspecific,
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&_read,
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&_readv,
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&_recvfrom,
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&_recvmsg,
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&_select,
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&_sendmsg,
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&_sendto,
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&_setsockopt,
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&_sigaction,
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&_sigprocmask,
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&_sigsuspend,
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&_socket,
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&_socketpair,
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&_wait4,
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&_write,
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&_writev
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};
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/*
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* These are needed when linking statically. All references within
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* libgcc (and in the future libc) to these routines are weak, but
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* if they are not (strongly) referenced by the application or other
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* libraries, then the actual functions will not be loaded.
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*/
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static void *libgcc_references[] = {
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&_pthread_once,
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&_pthread_key_create,
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&_pthread_key_delete,
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&_pthread_getspecific,
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&_pthread_setspecific,
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&_pthread_mutex_init,
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&_pthread_mutex_destroy,
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&_pthread_mutex_lock,
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&_pthread_mutex_trylock,
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&_pthread_mutex_unlock
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};
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/*
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* Threaded process initialization
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*/
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void
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_thread_init(void)
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{
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int fd;
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int flags;
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int i;
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size_t len;
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int mib[2];
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struct clockinfo clockinfo;
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struct sigaction act;
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/* Check if this function has already been called: */
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if (_thread_initial)
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/* Only initialise the threaded application once. */
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return;
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/*
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* Make gcc quiescent about {,libgcc_}references not being
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* referenced:
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*/
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if ((references[0] == NULL) || (libgcc_references[0] == NULL))
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PANIC("Failed loading mandatory references in _thread_init");
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/*
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* Check for the special case of this process running as
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* or in place of init as pid = 1:
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*/
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if (getpid() == 1) {
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/*
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* Setup a new session for this process which is
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* assumed to be running as root.
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*/
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if (setsid() == -1)
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PANIC("Can't set session ID");
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if (revoke(_PATH_CONSOLE) != 0)
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PANIC("Can't revoke console");
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if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
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PANIC("Can't open console");
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if (setlogin("root") == -1)
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PANIC("Can't set login to root");
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if (__sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1)
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PANIC("Can't set controlling terminal");
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if (__sys_dup2(fd,0) == -1 ||
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__sys_dup2(fd,1) == -1 ||
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__sys_dup2(fd,2) == -1)
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PANIC("Can't dup2");
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}
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/* Get the standard I/O flags before messing with them : */
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for (i = 0; i < 3; i++)
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if (((_pthread_stdio_flags[i] =
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__sys_fcntl(i,F_GETFL, NULL)) == -1) &&
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(errno != EBADF))
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PANIC("Cannot get stdio flags");
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/*
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* Create a pipe that is written to by the signal handler to prevent
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* signals being missed in calls to _select:
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*/
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if (__sys_pipe(_thread_kern_pipe) != 0) {
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/* Cannot create pipe, so abort: */
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PANIC("Cannot create kernel pipe");
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}
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/* Get the flags for the read pipe: */
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else if ((flags = __sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) {
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/* Abort this application: */
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PANIC("Cannot get kernel read pipe flags");
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}
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/* Make the read pipe non-blocking: */
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else if (__sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) {
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/* Abort this application: */
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PANIC("Cannot make kernel read pipe non-blocking");
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}
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/* Get the flags for the write pipe: */
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else if ((flags = __sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) {
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/* Abort this application: */
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PANIC("Cannot get kernel write pipe flags");
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}
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/* Make the write pipe non-blocking: */
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else if (__sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
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/* Abort this application: */
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PANIC("Cannot get kernel write pipe flags");
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}
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/* Allocate and initialize the ready queue: */
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else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_PRIORITY) != 0) {
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/* Abort this application: */
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PANIC("Cannot allocate priority ready queue.");
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}
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/* Allocate memory for the thread structure of the initial thread: */
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else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) {
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/*
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* Insufficient memory to initialise this application, so
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* abort:
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*/
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PANIC("Cannot allocate memory for initial thread");
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}
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/* Allocate memory for the scheduler stack: */
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else if ((_thread_kern_sched_stack = malloc(SCHED_STACK_SIZE)) == NULL)
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PANIC("Failed to allocate stack for scheduler");
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else {
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/* Zero the global kernel thread structure: */
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memset(&_thread_kern_thread, 0, sizeof(struct pthread));
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_thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE;
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memset(_thread_initial, 0, sizeof(struct pthread));
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/* Initialize the waiting and work queues: */
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TAILQ_INIT(&_waitingq);
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TAILQ_INIT(&_workq);
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/* Initialize the scheduling switch hook routine: */
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_sched_switch_hook = NULL;
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/* Give this thread default attributes: */
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memcpy((void *) &_thread_initial->attr, &pthread_attr_default,
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sizeof(struct pthread_attr));
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/* Initialize the thread stack cache: */
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SLIST_INIT(&_stackq);
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/*
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* Create a red zone below the main stack. All other stacks are
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* constrained to a maximum size by the paramters passed to
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* mmap(), but this stack is only limited by resource limits, so
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* this stack needs an explicitly mapped red zone to protect the
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* thread stack that is just beyond.
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*/
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if (mmap((void *) USRSTACK - PTHREAD_STACK_INITIAL -
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PTHREAD_STACK_GUARD, PTHREAD_STACK_GUARD, 0, MAP_ANON,
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-1, 0) == MAP_FAILED)
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PANIC("Cannot allocate red zone for initial thread");
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/* Set the main thread stack pointer. */
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_thread_initial->stack = (void *) USRSTACK -
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PTHREAD_STACK_INITIAL;
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/* Set the stack attributes: */
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_thread_initial->attr.stackaddr_attr = _thread_initial->stack;
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_thread_initial->attr.stacksize_attr = PTHREAD_STACK_INITIAL;
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/* Setup the context for the scheduler: */
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_setjmp(_thread_kern_sched_jb);
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SET_STACK_JB(_thread_kern_sched_jb, _thread_kern_sched_stack +
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SCHED_STACK_SIZE - sizeof(double));
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SET_RETURN_ADDR_JB(_thread_kern_sched_jb, _thread_kern_scheduler);
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/*
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* Write a magic value to the thread structure
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* to help identify valid ones:
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*/
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_thread_initial->magic = PTHREAD_MAGIC;
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/* Set the initial cancel state */
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_thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE |
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PTHREAD_CANCEL_DEFERRED;
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/* Default the priority of the initial thread: */
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_thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY;
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_thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY;
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_thread_initial->inherited_priority = 0;
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/* Initialise the state of the initial thread: */
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_thread_initial->state = PS_RUNNING;
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/* Set the name of the thread: */
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_thread_initial->name = strdup("_thread_initial");
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/* Initialise the queue: */
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TAILQ_INIT(&(_thread_initial->join_queue));
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/* Initialize the owned mutex queue and count: */
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TAILQ_INIT(&(_thread_initial->mutexq));
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_thread_initial->priority_mutex_count = 0;
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/* Initialize the global scheduling time: */
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_sched_ticks = 0;
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gettimeofday((struct timeval *) &_sched_tod, NULL);
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/* Initialize last active: */
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_thread_initial->last_active = (long) _sched_ticks;
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/* Initialize the initial context: */
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_thread_initial->curframe = NULL;
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_thread_initial->ctxtype = CTX_JB_NOSIG;
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/* Initialise the rest of the fields: */
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_thread_initial->poll_data.nfds = 0;
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_thread_initial->poll_data.fds = NULL;
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_thread_initial->sig_defer_count = 0;
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_thread_initial->yield_on_sig_undefer = 0;
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_thread_initial->specific_data = NULL;
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_thread_initial->cleanup = NULL;
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_thread_initial->flags = 0;
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_thread_initial->error = 0;
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TAILQ_INIT(&_thread_list);
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TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle);
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_set_curthread(_thread_initial);
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/* Initialise the global signal action structure: */
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sigfillset(&act.sa_mask);
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act.sa_handler = (void (*) ()) _thread_sig_handler;
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act.sa_flags = SA_SIGINFO | SA_ONSTACK;
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/* Clear pending signals for the process: */
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sigemptyset(&_process_sigpending);
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/* Clear the signal queue: */
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memset(_thread_sigq, 0, sizeof(_thread_sigq));
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/*
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* Create and install an alternate signal stack of
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* the recommended size:
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*/
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_thread_sigstack.ss_sp = malloc(SIGSTKSZ);
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_thread_sigstack.ss_size = SIGSTKSZ;
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_thread_sigstack.ss_flags = 0;
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if ((_thread_sigstack.ss_sp == NULL) ||
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(__sys_sigaltstack(&_thread_sigstack, NULL) != 0))
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PANIC("Unable to install alternate signal stack");
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/* Enter a loop to get the existing signal status: */
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for (i = 1; i < NSIG; i++) {
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/* Check for signals which cannot be trapped: */
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if (i == SIGKILL || i == SIGSTOP) {
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}
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/* Get the signal handler details: */
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else if (__sys_sigaction(i, NULL,
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&_thread_sigact[i - 1]) != 0) {
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/*
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* Abort this process if signal
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* initialisation fails:
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*/
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PANIC("Cannot read signal handler info");
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}
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/* Initialize the SIG_DFL dummy handler count. */
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_thread_dfl_count[i] = 0;
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}
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/*
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* Install the signal handler for the most important
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* signals that the user-thread kernel needs. Actually
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* SIGINFO isn't really needed, but it is nice to have.
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*/
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if (__sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 ||
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__sys_sigaction(SIGINFO, &act, NULL) != 0 ||
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__sys_sigaction(SIGCHLD, &act, NULL) != 0) {
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/*
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* Abort this process if signal initialisation fails:
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*/
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PANIC("Cannot initialise signal handler");
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}
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_thread_sigact[_SCHED_SIGNAL - 1].sa_flags = SA_SIGINFO;
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_thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO;
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_thread_sigact[SIGCHLD - 1].sa_flags = SA_SIGINFO;
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/* Get the process signal mask: */
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__sys_sigprocmask(SIG_SETMASK, NULL, &_process_sigmask);
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/* Get the kernel clockrate: */
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mib[0] = CTL_KERN;
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mib[1] = KERN_CLOCKRATE;
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len = sizeof (struct clockinfo);
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if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
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_clock_res_usec = clockinfo.tick;
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/* Get the table size: */
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if ((_thread_dtablesize = getdtablesize()) < 0) {
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/*
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* Cannot get the system defined table size, so abort
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* this process.
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*/
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PANIC("Cannot get dtablesize");
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}
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/* Allocate memory for the file descriptor table: */
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if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) {
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/* Avoid accesses to file descriptor table on exit: */
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_thread_dtablesize = 0;
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/*
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* Cannot allocate memory for the file descriptor
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* table, so abort this process.
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*/
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PANIC("Cannot allocate memory for file descriptor table");
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}
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/* Allocate memory for the pollfd table: */
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if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) {
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/*
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* Cannot allocate memory for the file descriptor
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* table, so abort this process.
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*/
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PANIC("Cannot allocate memory for pollfd table");
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} else {
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/*
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* Enter a loop to initialise the file descriptor
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* table:
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*/
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for (i = 0; i < _thread_dtablesize; i++) {
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/* Initialise the file descriptor table: */
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_thread_fd_table[i] = NULL;
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}
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/* Initialize stdio file descriptor table entries: */
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for (i = 0; i < 3; i++) {
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if ((_thread_fd_table_init(i) != 0) &&
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(errno != EBADF))
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PANIC("Cannot initialize stdio file "
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"descriptor table entry");
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}
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}
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}
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/* Initialise the garbage collector mutex and condition variable. */
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if (_pthread_mutex_init(&_gc_mutex,NULL) != 0 ||
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pthread_cond_init(&_gc_cond,NULL) != 0)
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PANIC("Failed to initialise garbage collector mutex or condvar");
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}
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/*
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* Special start up code for NetBSD/Alpha
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*/
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#if defined(__NetBSD__) && defined(__alpha__)
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int
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main(int argc, char *argv[], char *env);
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int
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_thread_main(int argc, char *argv[], char *env)
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{
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_thread_init();
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return (main(argc, argv, env));
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}
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#endif
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