freebsd-dev/lib/libthr/thread/thr_init.c
Mike Makonnen 12c407a424 Return gracefully, rather than aborting, when the maximum concurrent
threads per process has been reached. Return EAGAIN, as per spec.

Approved by:	re/blanket libthr
2003-05-25 22:40:57 +00:00

349 lines
9.4 KiB
C

/*
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/* Allocate space for global thread variables here: */
#define GLOBAL_PTHREAD_PRIVATE
#include "namespace.h"
#include <sys/param.h>
#include <sys/types.h>
#include <machine/reg.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <sys/event.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/ttycom.h>
#include <sys/user.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"
#include "thr_private.h"
/*
* All weak references used within libc should be in this table.
* This will is so that static libraries will work.
*
* XXXTHR - Check this list.
*/
static void *references[] = {
&_accept,
&_bind,
&_close,
&_connect,
&_dup,
&_dup2,
&_execve,
&_fcntl,
&_flock,
&_flockfile,
&_fstat,
&_fstatfs,
&_fsync,
&_funlockfile,
&_getdirentries,
&_getlogin,
&_getpeername,
&_getsockname,
&_getsockopt,
&_ioctl,
&_kevent,
&_listen,
&_nanosleep,
&_open,
&_pthread_getspecific,
&_pthread_key_create,
&_pthread_key_delete,
&_pthread_mutex_destroy,
&_pthread_mutex_init,
&_pthread_mutex_lock,
&_pthread_mutex_trylock,
&_pthread_mutex_unlock,
&_pthread_mutexattr_init,
&_pthread_mutexattr_destroy,
&_pthread_mutexattr_settype,
&_pthread_once,
&_pthread_setspecific,
&_read,
&_readv,
&_recvfrom,
&_recvmsg,
&_select,
&_sendmsg,
&_sendto,
&_setsockopt,
&_sigaction,
&_sigprocmask,
&_sigsuspend,
&_socket,
&_socketpair,
&_wait4,
&_write,
&_writev
};
/*
* These are needed when linking statically. All references within
* libgcc (and in the future libc) to these routines are weak, but
* if they are not (strongly) referenced by the application or other
* libraries, then the actual functions will not be loaded.
*/
static void *libgcc_references[] = {
&_pthread_once,
&_pthread_key_create,
&_pthread_key_delete,
&_pthread_getspecific,
&_pthread_setspecific,
&_pthread_mutex_init,
&_pthread_mutex_destroy,
&_pthread_mutex_lock,
&_pthread_mutex_trylock,
&_pthread_mutex_unlock
};
int _pthread_guard_default;
int _pthread_page_size;
/*
* Threaded process initialization
*/
void
_thread_init(void)
{
struct pthread *pthread;
int fd;
int i;
size_t len;
int mib[2];
sigset_t set;
int error;
struct clockinfo clockinfo;
struct sigaction act;
/* Check if this function has already been called: */
if (_thread_initial)
/* Only initialise the threaded application once. */
return;
_pthread_page_size = getpagesize();
_pthread_guard_default = getpagesize();
pthread_attr_default.guardsize_attr = _pthread_guard_default;
/*
* Make gcc quiescent about {,libgcc_}references not being
* referenced:
*/
if ((references[0] == NULL) || (libgcc_references[0] == NULL))
PANIC("Failed loading mandatory references in _thread_init");
/*
* Check for the special case of this process running as
* or in place of init as pid = 1:
*/
if (getpid() == 1) {
/*
* Setup a new session for this process which is
* assumed to be running as root.
*/
if (setsid() == -1)
PANIC("Can't set session ID");
if (revoke(_PATH_CONSOLE) != 0)
PANIC("Can't revoke console");
if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
PANIC("Can't open console");
if (setlogin("root") == -1)
PANIC("Can't set login to root");
if (__sys_ioctl(fd, TIOCSCTTY, (char *) NULL) == -1)
PANIC("Can't set controlling terminal");
if (__sys_dup2(fd, 0) == -1 ||
__sys_dup2(fd, 1) == -1 ||
__sys_dup2(fd, 2) == -1)
PANIC("Can't dup2");
}
/* Allocate memory for the thread structure of the initial thread: */
if ((pthread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) {
/*
* Insufficient memory to initialise this application, so
* abort:
*/
PANIC("Cannot allocate memory for initial thread");
}
/* Zero the initial thread structure: */
memset(pthread, 0, sizeof(struct pthread));
_thread_initial = pthread;
pthread->arch_id = _set_curthread(NULL, pthread, &error);
/* Get our thread id. */
thr_self(&pthread->thr_id);
/* Give this thread default attributes: */
memcpy((void *) &pthread->attr, &pthread_attr_default,
sizeof(struct pthread_attr));
/* Find the stack top */
mib[0] = CTL_KERN;
mib[1] = KERN_USRSTACK;
len = sizeof (_usrstack);
if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1)
_usrstack = (void *)USRSTACK;
/*
* Create a red zone below the main stack. All other stacks are
* constrained to a maximum size by the paramters passed to
* mmap(), but this stack is only limited by resource limits, so
* this stack needs an explicitly mapped red zone to protect the
* thread stack that is just beyond.
*/
if (mmap(_usrstack - PTHREAD_STACK_INITIAL -
_pthread_guard_default, _pthread_guard_default, 0,
MAP_ANON, -1, 0) == MAP_FAILED)
PANIC("Cannot allocate red zone for initial thread");
/* Set the main thread stack pointer. */
pthread->stack = _usrstack - PTHREAD_STACK_INITIAL;
/* Set the stack attributes. */
pthread->attr.stackaddr_attr = pthread->stack;
pthread->attr.stacksize_attr = PTHREAD_STACK_INITIAL;
/*
* Write a magic value to the thread structure
* to help identify valid ones:
*/
pthread->magic = PTHREAD_MAGIC;
/* Set the initial cancel state */
pthread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED;
/* Setup the context for initial thread. */
getcontext(&pthread->ctx);
pthread->ctx.uc_stack.ss_sp = pthread->stack;
pthread->ctx.uc_stack.ss_size = PTHREAD_STACK_INITIAL;
/* Default the priority of the initial thread: */
pthread->base_priority = PTHREAD_DEFAULT_PRIORITY;
pthread->active_priority = PTHREAD_DEFAULT_PRIORITY;
pthread->inherited_priority = 0;
/* Initialise the state of the initial thread: */
pthread->state = PS_RUNNING;
/* Set the name of the thread: */
pthread->name = strdup("_thread_initial");
/* Initialize joiner to NULL (no joiner): */
pthread->joiner = NULL;
/* Initialize the owned mutex queue and count: */
TAILQ_INIT(&(pthread->mutexq));
pthread->priority_mutex_count = 0;
/* Initialise the rest of the fields: */
pthread->specific = NULL;
pthread->cleanup = NULL;
pthread->flags = 0;
pthread->error = 0;
TAILQ_INIT(&_thread_list);
TAILQ_INSERT_HEAD(&_thread_list, pthread, tle);
/* Enter a loop to get the existing signal status: */
for (i = 1; i < NSIG; i++) {
/* Check for signals which cannot be trapped. */
if (i == SIGKILL || i == SIGSTOP)
continue;
/* Get the signal handler details. */
if (__sys_sigaction(i, NULL,
&_thread_sigact[i - 1]) != 0)
PANIC("Cannot read signal handler info");
}
act.sa_sigaction = _thread_sig_wrapper;
act.sa_flags = SA_SIGINFO;
SIGFILLSET(act.sa_mask);
if (__sys_sigaction(SIGTHR, &act, NULL))
PANIC("Cannot set SIGTHR handler.\n");
SIGEMPTYSET(set);
SIGADDSET(set, SIGTHR);
__sys_sigprocmask(SIG_BLOCK, &set, 0);
/* Get the kernel clockrate: */
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
len = sizeof (struct clockinfo);
if (sysctl(mib, 2, &clockinfo, &len, NULL, 0) == 0)
_clock_res_usec = clockinfo.tick > CLOCK_RES_USEC_MIN ?
clockinfo.tick : CLOCK_RES_USEC_MIN;
/* Initialise the garbage collector mutex and condition variable. */
if (_pthread_mutex_init(&dead_list_lock,NULL) != 0 ||
_pthread_cond_init(&_gc_cond,NULL) != 0)
PANIC("Failed to initialise garbage collector mutex or condvar");
}
/*
* Special start up code for NetBSD/Alpha
*/
#if defined(__NetBSD__) && defined(__alpha__)
int
main(int argc, char *argv[], char *env);
int
_thread_main(int argc, char *argv[], char *env)
{
_thread_init();
return (main(argc, argv, env));
}
#endif