/* $OpenBSD: uthread_init.c,v 1.9 1999/05/26 00:18:24 d 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. * */ #include #include #include #include #include #include #include #include #include #include #include #ifdef _THREAD_SAFE #include #include #include #include "pthread_private.h" /* Allocate space for global thread variables here: */ static struct pthread kern_thread; struct pthread * volatile _thread_kern_threadp = &kern_thread; struct pthread * volatile _thread_run = &kern_thread; struct pthread * volatile _last_user_thread = &kern_thread; struct pthread * volatile _thread_single = NULL; struct pthread * volatile _thread_link_list = NULL; int _thread_kern_pipe[2] = { -1, -1 }; int _thread_kern_in_select = 0; int _thread_kern_in_sched = 0; struct timeval kern_inc_prio_time = { 0, 0 }; struct pthread * volatile _thread_dead = NULL; struct pthread * _thread_initial = NULL; struct pthread_attr pthread_attr_default = { SCHED_RR, /* sched_policy */ 0, /* sched_inherit */ TIMESLICE_USEC, /* sched_interval */ PTHREAD_DEFAULT_PRIORITY, /* prio */ PTHREAD_CREATE_RUNNING, /* suspend */ PTHREAD_CREATE_JOINABLE, /* flags */ NULL, /* arg_attr */ NULL, /* cleanup_attr */ NULL, /* stackaddr_attr */ PTHREAD_STACK_DEFAULT /* stacksize_attr */ }; struct pthread_mutex_attr pthread_mutexattr_default = { PTHREAD_MUTEX_DEFAULT, /* m_type */ PTHREAD_PRIO_NONE, /* m_protocol */ 0, /* m_ceiling */ 0 /* m_flags */ }; struct pthread_cond_attr pthread_condattr_default = { COND_TYPE_FAST, /* c_type */ 0 /* c_flags */ }; int _pthread_stdio_flags[3]; struct fd_table_entry ** _thread_fd_table = NULL; int _thread_dtablesize = NOFILE_MAX; pthread_mutex_t _gc_mutex = NULL; pthread_cond_t _gc_cond = NULL; struct sigaction _thread_sigact[NSIG]; const int dtablecount = 4096/sizeof(struct fd_table_entry); pq_queue_t _readyq; _waitingq_t _waitingq; volatile int _waitingq_check_reqd = 0; pthread_switch_routine_t _sched_switch_hook = NULL; /* Automatic init module. */ extern int _thread_autoinit_dummy_decl; #ifdef GCC_2_8_MADE_THREAD_AWARE /* see src/gnu/usr.bin/gcc/libgcc2.c */ typedef void *** (*dynamic_handler_allocator)(); extern void __set_dynamic_handler_allocator(dynamic_handler_allocator); static pthread_key_t except_head_key; typedef struct { void **__dynamic_handler_chain; void *top_elt[2]; } except_struct; static void ***dynamic_allocator_handler_fn() { except_struct *dh = (except_struct *)pthread_getspecific(except_head_key); if(dh == NULL) { dh = (except_struct *)malloc( sizeof(except_struct) ); memset(dh, '\0', sizeof(except_struct)); dh->__dynamic_handler_chain= dh->top_elt; pthread_setspecific(except_head_key, (void *)dh); } return &dh->__dynamic_handler_chain; } #endif /* GCC_2_8_MADE_THREAD_AWARE */ /* * Threaded process initialization */ void _thread_init(void) { int fd; int flags; int i; struct sigaction act; /* Check if this function has already been called: */ if (_thread_initial) /* Only initialise the threaded application once. */ return; /* * 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"); } /* Get the standard I/O flags before messing with them : */ for (i = 0; i < 3; i++) if ((_pthread_stdio_flags[i] = _thread_sys_fcntl(i,F_GETFL, NULL)) == -1) PANIC("Cannot get stdio flags"); /* * 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) { /* Cannot create pipe, so abort: */ PANIC("Cannot create kernel pipe"); } /* Get the flags for the read pipe: */ else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) { /* Abort this application: */ PANIC("Cannot get kernel read pipe flags"); } /* Make the read pipe non-blocking: */ else if (_thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) { /* Abort this application: */ PANIC("Cannot make kernel read pipe non-blocking"); } /* Get the flags for the write pipe: */ else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) { /* Abort this application: */ PANIC("Cannot get kernel write pipe flags"); } /* Make the write pipe non-blocking: */ else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) { /* Abort this application: */ PANIC("Cannot get kernel write pipe flags"); } /* Initialize the ready queue: */ else if (_pq_init(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_MAX_PRIORITY) != 0) { /* Abort this application: */ PANIC("Cannot allocate priority ready queue."); } /* Allocate memory for the thread structure of the initial thread: */ else if ((_thread_initial = (pthread_t) malloc(sizeof(struct pthread))) == NULL) { /* * Insufficient memory to initialise this application, so * abort: */ PANIC("Cannot allocate memory for initial thread"); } else { /* Zero the global kernel thread structure: */ memset(_thread_kern_threadp, 0, sizeof(struct pthread)); _thread_kern_threadp->magic = PTHREAD_MAGIC; /* Set the kernel's name for the debugger: */ pthread_set_name_np(_thread_kern_threadp, "kern"); /* The kernel thread is a library thread: */ _thread_kern_threadp->flags = PTHREAD_FLAGS_PRIVATE; /* Initialize the waiting queue: */ TAILQ_INIT(&_waitingq); /* Initialize the scheduling switch hook routine: */ _sched_switch_hook = NULL; /* Zero the initial thread: */ memset(_thread_initial, 0, sizeof(struct pthread)); /* * Write a magic value to the thread structure * to help identify valid ones: */ _thread_initial->magic = PTHREAD_MAGIC; /* 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; /* Initialise the queue: */ _thread_queue_init(&(_thread_initial->join_queue)); /* Initialize the owned mutex queue and count: */ TAILQ_INIT(&(_thread_initial->mutexq)); _thread_initial->priority_mutex_count = 0; /* Initialise the rest of the fields: */ _thread_initial->sched_defer_count = 0; _thread_initial->yield_on_sched_undefer = 0; _thread_initial->specific_data = NULL; _thread_initial->cleanup = NULL; _thread_initial->queue = NULL; _thread_initial->qnxt = NULL; _thread_initial->nxt = NULL; _thread_initial->flags = 0; _thread_initial->error = 0; _thread_initial->cancelstate = PTHREAD_CANCEL_ENABLE; _thread_initial->canceltype = PTHREAD_CANCEL_DEFERRED; pthread_set_name_np(_thread_initial, "init"); _SPINUNLOCK(&_thread_initial->lock); _thread_link_list = _thread_initial; _thread_run = _thread_initial; /* Initialise the global signal action structure: */ sigfillset(&act.sa_mask); act.sa_handler = (void (*) ()) _thread_sig_handler; act.sa_flags = 0; /* 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) { } /* Get the signal handler details: */ else if (_thread_sys_sigaction(i, NULL, &_thread_sigact[i - 1]) != 0) { /* * Abort this process if signal * initialisation fails: */ PANIC("Cannot read signal handler info"); } } /* * 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) { /* * Abort this process if signal initialisation fails: */ PANIC("Cannot initialise signal handler"); } /* Get the table size: */ if ((_thread_dtablesize = getdtablesize()) < 0) { /* * Cannot get the system defined table size, so abort * this process. */ PANIC("Cannot get dtablesize"); } /* Allocate memory for the file descriptor table: */ if ((_thread_fd_table = (struct fd_table_entry **) malloc(sizeof(struct fd_table_entry *) * _thread_dtablesize)) == NULL) { /* * Cannot allocate memory for the file descriptor * table, so abort this process. */ PANIC("Cannot allocate memory for file descriptor table"); } else { /* * Enter a loop to initialise the file descriptor * table: */ for (i = 0; i < _thread_dtablesize; i++) { /* Initialise the file descriptor table: */ _thread_fd_table[i] = NULL; } } } #ifdef GCC_2_8_MADE_THREAD_AWARE /* Create the thread-specific data for the exception linked list. */ if(pthread_key_create(&except_head_key, NULL) != 0) PANIC("Failed to create thread specific execption head"); /* Setup the gcc exception handler per thread. */ __set_dynamic_handler_allocator( dynamic_allocator_handler_fn ); #endif /* GCC_2_8_MADE_THREAD_AWARE */ /* 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 condvar"); gettimeofday(&kern_inc_prio_time, NULL); /* Pull in automatic thread unit. */ _thread_autoinit_dummy_decl = 1; return; } #endif _THREAD_SAFE