69186ed701
(it was leaving an unused block). Also protect the global stack pointer from context changes while fiddling with it.
367 lines
11 KiB
C
367 lines
11 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 <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 <poll.h>
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#include <unistd.h>
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#include <sys/ioctl.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/param.h>
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#include <sys/user.h>
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#include <sys/mman.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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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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* 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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(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 (_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 and initialize the ready queue: */
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else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_MAX_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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} 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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/* Initialize the thread stack cache: */
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SLIST_INIT(&_stackq);
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/* Create the red zone for the main stack. */
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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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/*
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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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/* 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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/* 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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_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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/* Initialize signal handling: */
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_thread_sig_init();
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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(_SCHED_SIGNAL, &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 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_nsec = clockinfo.tick * 1000;
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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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#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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/* 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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gettimeofday(&kern_inc_prio_time, NULL);
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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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