/* $OpenBSD: uthread_init.c,v 1.34 2006/03/06 18:37:53 otto Exp $ */ /* * Copyright (c) 1995-1998 John Birrell * 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: uthread_init.c,v 1.18 1999/08/28 00:03:36 peter Exp $ */ /* Allocate space for global thread variables here: */ #define GLOBAL_PTHREAD_PRIVATE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef _THREAD_SAFE #include #include #include "pthread_private.h" /* Global thread variables. */ _stack_list_t _stackq; extern int _thread_autoinit_dummy_decl; /* * All weak references used within libc that are redefined in libpthread * MUST be in this table. This is necessary to force the proper version to * be used when linking -static. */ static void *references[] = { &_exit, &accept, &bind, &close, &closefrom, &connect, &dup, &dup2, &execve, &fchflags, &fchmod, &fchown, &fcntl, &flock, &fork, &fpathconf, &fstat, &fstatfs, &fsync, &getdirentries, &getpeername, &getsockname, &getsockopt, &ioctl, &kevent, &kqueue, &listen, &msync, &nanosleep, &open, &pipe, &poll, &read, &readv, &recvfrom, &recvmsg, &select, &sendmsg, &sendto, &setsockopt, &shutdown, &sigaction, &sigaltstack, &sigpending, &sigprocmask, &sigsuspend, &socket, &socketpair, &vfork, &wait4, &write, &writev, /* libc thread-safe helper functions */ &_thread_fd_lock, &_thread_fd_unlock, &_thread_malloc_init, &_thread_malloc_lock, &_thread_malloc_unlock, &_thread_atexit_lock, &_thread_atexit_unlock, &_thread_tag_lock, &_thread_tag_unlock, &_thread_tag_storage, &flockfile, &ftrylockfile, &funlockfile }; /* * Threaded process initialization */ void _thread_init(void) { int fd; int flags; int res; int i; size_t len; int mib[2]; struct clockinfo clockinfo; struct sigaction act; /* Check if this function has already been called: */ if (_thread_initial) /* Only initialise the threaded application once. */ return; if (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 = _thread_sys_open(_PATH_CONSOLE, O_RDWR)) < 0) PANIC("Can't open console"); if (setlogin("root") == -1) PANIC("Can't set login to root"); if (_thread_sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1) PANIC("Can't set controlling terminal"); if (_thread_sys_dup2(fd,0) == -1 || _thread_sys_dup2(fd,1) == -1 || _thread_sys_dup2(fd,2) == -1) PANIC("Can't dup2"); } /* * Create a pipe that is written to by the signal handler to prevent * signals being missed in calls to _select: */ if (_thread_sys_pipe(_thread_kern_pipe) != 0) PANIC("Cannot create kernel pipe"); flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL); if (flags == -1) PANIC("Cannot get kernel read pipe flags"); res = _thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK); if (res == -1) PANIC("Cannot make kernel read pipe non-blocking"); flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL); if (flags == -1) PANIC("Cannot get kernel write pipe flags"); res = _thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK); if (res == -1) PANIC("Cannot make kernel write pipe non-blocking"); res = _pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_PRIORITY); if (res != 0) PANIC("Cannot allocate priority ready queue."); _thread_initial = (pthread_t) malloc(sizeof(struct pthread)); if (_thread_initial == NULL) PANIC("Cannot allocate memory for initial thread"); /* Zero the global kernel thread structure: */ memset(&_thread_kern_thread, 0, sizeof(struct pthread)); _thread_kern_thread.flags = PTHREAD_FLAGS_PRIVATE; memset(_thread_initial, 0, sizeof(struct pthread)); /* Initialize the waiting and work queues: */ TAILQ_INIT(&_waitingq); TAILQ_INIT(&_workq); /* Initialize the scheduling switch hook routine: */ _sched_switch_hook = NULL; /* Initialize the thread stack cache: */ SLIST_INIT(&_stackq); /* * Write a magic value to the thread structure * to help identify valid ones: */ _thread_initial->magic = PTHREAD_MAGIC; /* Set the initial cancel state */ _thread_initial->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; /* Default the priority of the initial thread: */ _thread_initial->base_priority = PTHREAD_DEFAULT_PRIORITY; _thread_initial->active_priority = PTHREAD_DEFAULT_PRIORITY; _thread_initial->inherited_priority = 0; /* Initialise the state of the initial thread: */ _thread_initial->state = PS_RUNNING; /* Initialize joiner to NULL (no joiner): */ _thread_initial->joiner = NULL; /* Initialize the owned mutex queue and count: */ TAILQ_INIT(&(_thread_initial->mutexq)); _thread_initial->priority_mutex_count = 0; /* Initialize the global scheduling time: */ _sched_ticks = 0; gettimeofday((struct timeval *) &_sched_tod, NULL); /* Initialize last active: */ _thread_initial->last_active = (long) _sched_ticks; /* Give it a useful name */ pthread_set_name_np(_thread_initial, (char *)"main"); /* Initialise the rest of the fields: */ _thread_initial->poll_data.nfds = 0; _thread_initial->poll_data.fds = NULL; _thread_initial->sig_defer_count = 0; _thread_initial->slice_usec = -1; _thread_initial->sig_saved = 0; _thread_initial->yield_on_sig_undefer = 0; _thread_initial->specific_data = NULL; _thread_initial->cleanup = NULL; _thread_initial->flags = 0; _thread_initial->error = 0; _SPINLOCK_INIT(&_thread_initial->lock); TAILQ_INIT(&_thread_list); TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle); _set_curthread(_thread_initial); TAILQ_INIT(&_atfork_list); pthread_mutex_init(&_atfork_mutex, NULL); /* Initialise the global signal action structure: */ sigfillset(&act.sa_mask); act.sa_handler = (void (*) (int)) _thread_sig_handler; act.sa_flags = SA_SIGINFO; /* Clear pending signals for the process: */ sigemptyset(&_process_sigpending); /* Initialize signal handling: */ _thread_sig_init(); /* 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 (_thread_sys_sigaction(i, NULL, &_thread_sigact[i - 1]) != 0) PANIC("Cannot read signal handler info"); /* Initialize the SIG_DFL dummy handler count. */ _thread_dfl_count[i] = 0; } /* * Install the signal handler for the most important * signals that the user-thread kernel needs. Actually * SIGINFO isn't really needed, but it is nice to have. */ if (_thread_sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 || _thread_sys_sigaction(SIGINFO, &act, NULL) != 0 || _thread_sys_sigaction(SIGCHLD, &act, NULL) != 0) PANIC("Cannot initialize signal handler"); _thread_sigact[_SCHED_SIGNAL - 1].sa_flags = SA_SIGINFO; _thread_sigact[SIGINFO - 1].sa_flags = SA_SIGINFO; _thread_sigact[SIGCHLD - 1].sa_flags = SA_SIGINFO; /* Get the process signal mask: */ _thread_sys_sigprocmask(SIG_SETMASK, NULL, &_process_sigmask); /* 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; /* Get the table size: */ if ((_thread_dtablesize = getdtablesize()) < 0) PANIC("Cannot get dtablesize"); /* Allocate memory for the file descriptor table: */ _thread_fd_table = calloc(_thread_dtablesize, sizeof(struct fd_table_entry *)); if (_thread_fd_table == NULL) { _thread_dtablesize = 0; PANIC("Cannot allocate memory for file descriptor table"); } /* Allocate memory for the pollfd table: */ _thread_pfd_table = calloc(_thread_dtablesize, sizeof(struct pollfd)); if (_thread_pfd_table == NULL) PANIC("Cannot allocate memory for pollfd table"); /* initialize the fd table */ _thread_fd_init(); /* Initialise the garbage collector mutex and condition variable. */ if (pthread_mutex_init(&_gc_mutex,NULL) != 0 || pthread_cond_init(&_gc_cond,NULL) != 0) PANIC("Failed to initialise garbage collector mutex or cond"); #if defined(__ELF__) /* Register with dlctl for thread safe dlopen */ dlctl(NULL, DL_SETTHREADLCK, _thread_kern_lock); #endif _thread_autoinit_dummy_decl = 0; } #endif