bbf157fac4
are started instead of init (pid = 1). This allows an embedded implementation quite like VxWorks, with (possibly) a single threaded program running instead of init. The neat thing is that the same threaded process can run in a multi-user workstation environment too.
280 lines
8.7 KiB
C
280 lines
8.7 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 REGENTS 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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*/
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/* Allocate space for global thread variables here: */
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#define GLOBAL_PTHREAD_PRIVATE
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/ttycom.h>
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#ifdef _THREAD_SAFE
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#include <machine/reg.h>
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#include <pthread.h>
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#include "pthread_private.h"
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#ifdef GCC_2_8_MADE_THREAD_AWARE
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typedef void *** (*dynamic_handler_allocator)();
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extern void __set_dynamic_handler_allocator(dynamic_handler_allocator);
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static pthread_key_t except_head_key;
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typedef struct {
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void **__dynamic_handler_chain;
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void *top_elt[2];
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} except_struct;
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static void ***dynamic_allocator_handler_fn()
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{
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except_struct *dh = (except_struct *)pthread_getspecific(except_head_key);
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if(dh == NULL) {
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dh = (except_struct *)malloc( sizeof(except_struct) );
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memset(dh, '\0', sizeof(except_struct));
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dh->__dynamic_handler_chain= dh->top_elt;
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pthread_setspecific(except_head_key, (void *)dh);
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}
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return &dh->__dynamic_handler_chain;
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}
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#endif /* GCC_2_8_MADE_THREAD_AWARE */
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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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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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* 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 = _thread_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 (_thread_sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1)
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PANIC("Can't set controlling terminal");
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if (_thread_sys_dup2(fd,0) == -1 ||
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_thread_sys_dup2(fd,1) == -1 ||
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_thread_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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_thread_sys_fcntl(i,F_GETFL, NULL)) == -1)
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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 (_thread_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 = _thread_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 (_thread_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 = _thread_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 (_thread_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 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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} 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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memset(_thread_initial, 0, sizeof(struct pthread));
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/* Default the priority of the initial thread: */
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_thread_initial->pthread_priority = PTHREAD_DEFAULT_PRIORITY;
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/* Initialise the state of the initial thread: */
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_thread_initial->state = PS_RUNNING;
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/* Initialise the queue: */
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_thread_queue_init(&(_thread_initial->join_queue));
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/* Initialise the rest of the fields: */
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_thread_initial->specific_data = NULL;
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_thread_initial->cleanup = NULL;
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_thread_initial->queue = NULL;
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_thread_initial->qnxt = NULL;
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_thread_initial->nxt = NULL;
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_thread_initial->flags = 0;
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_thread_initial->error = 0;
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_thread_link_list = _thread_initial;
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_thread_run = _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 = 0;
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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 (_thread_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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}
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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 (_thread_sys_sigaction(SIGVTALRM, &act, NULL) != 0 ||
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_thread_sys_sigaction(SIGINFO , &act, NULL) != 0 ||
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_thread_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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/* 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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/*
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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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} 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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}
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}
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#ifdef GCC_2_8_MADE_THREAD_AWARE
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/* Create the thread-specific data for the exception linked list. */
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if(pthread_key_create(&except_head_key, NULL) != 0)
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PANIC("Failed to create thread specific execption head");
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/* Setup the gcc exception handler per thread. */
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__set_dynamic_handler_allocator( dynamic_allocator_handler_fn );
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#endif /* GCC_2_8_MADE_THREAD_AWARE */
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return;
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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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#else
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/*
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* A stub for non-threaded programs.
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*/
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void
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_thread_init(void)
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{
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}
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#endif
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