/* * 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: src/lib/libc_r/uthread/uthread_init.c,v 1.23.2.11 2003/02/24 23:27:32 das Exp $ * $DragonFly: src/lib/libc_r/uthread/uthread_init.c,v 1.4 2005/03/13 15:10:03 swildner 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 "pthread_private.h" /* * 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 *thread_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, &_pthread_cond_init, &_pthread_cond_destroy, &_pthread_cond_wait, &_pthread_cond_timedwait, &_pthread_cond_signal, &_pthread_cond_broadcast }; #ifdef GCC_2_8_MADE_THREAD_AWARE 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) __attribute__((constructor)); void _thread_init(void) { int fd; int flags; 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; /* * Make gcc quiescent about thread_references not being * referenced: */ if (thread_references[0] == NULL) PANIC("Mandatory pthread_* functions not loaded"); /* * 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"); } /* Get the standard I/O flags before messing with them : */ for (i = 0; i < 3; i++) { if (((_pthread_stdio_flags[i] = __sys_fcntl(i, F_GETFL, NULL)) == -1) && (errno != EBADF)) 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 (__sys_pipe(_thread_kern_pipe) != 0) { /* Cannot create pipe, so abort: */ PANIC("Cannot create kernel pipe"); } /* * Make sure the pipe does not get in the way of stdio: */ for (i = 0; i < 2; i++) { if (_thread_kern_pipe[i] < 3) { fd = __sys_fcntl(_thread_kern_pipe[i], F_DUPFD, 3); if (fd == -1) PANIC("Cannot create kernel pipe"); __sys_close(_thread_kern_pipe[i]); _thread_kern_pipe[i] = fd; } } /* Get the flags for the read pipe: */ if ((flags = __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 (__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 = __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 (__sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) { /* Abort this application: */ PANIC("Cannot get kernel write pipe flags"); } /* Allocate and initialize the ready queue: */ else if (_pq_alloc(&_readyq, PTHREAD_MIN_PRIORITY, PTHREAD_LAST_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"); } /* Allocate memory for the scheduler stack: */ else if ((_thread_kern_sched_stack = malloc(SCHED_STACK_SIZE)) == NULL) PANIC("Failed to allocate stack for scheduler"); else { /* 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; /* Give this thread default attributes: */ memcpy((void *) &_thread_initial->attr, &pthread_attr_default, sizeof(struct pthread_attr)); /* Initialize the thread stack cache: */ SLIST_INIT(&_stackq); /* Find the stack top */ mib[0] = CTL_KERN; mib[1] = KERN_USRSTACK; len = sizeof (int); if (sysctl(mib, 2, &_usrstack, &len, NULL, 0) == -1) _usrstack = (void *)USRSTACK; _next_stack = _usrstack - PTHREAD_STACK_INITIAL - PTHREAD_STACK_DEFAULT - (2 * PTHREAD_STACK_GUARD); /* * 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_STACK_GUARD, PTHREAD_STACK_GUARD, 0, MAP_ANON, -1, 0) == MAP_FAILED) PANIC("Cannot allocate red zone for initial thread"); /* Set the main thread stack pointer. */ _thread_initial->stack = _usrstack - PTHREAD_STACK_INITIAL; /* Set the stack attributes: */ _thread_initial->attr.stackaddr_attr = _thread_initial->stack; _thread_initial->attr.stacksize_attr = PTHREAD_STACK_INITIAL; /* Setup the context for the scheduler: */ _setjmp(_thread_kern_sched_jb); SET_STACK_JB(_thread_kern_sched_jb, _thread_kern_sched_stack + SCHED_STACK_SIZE - sizeof(double)); SET_RETURN_ADDR_JB(_thread_kern_sched_jb, _thread_kern_scheduler); /* * 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; /* Set the name of the thread: */ _thread_initial->name = strdup("_thread_initial"); /* 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; /* Initialize the initial context: */ _thread_initial->curframe = NULL; /* 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->yield_on_sig_undefer = 0; _thread_initial->specific_data = NULL; _thread_initial->cleanup = NULL; _thread_initial->flags = 0; _thread_initial->error = 0; TAILQ_INIT(&_thread_list); TAILQ_INSERT_HEAD(&_thread_list, _thread_initial, tle); _set_curthread(_thread_initial); /* Initialise the global signal action structure: */ sigfillset(&act.sa_mask); act.sa_handler = (void (*) ()) _thread_sig_handler; act.sa_flags = SA_SIGINFO | SA_RESTART; /* Clear pending signals for the process: */ sigemptyset(&_process_sigpending); /* Clear the signal queue: */ memset(_thread_sigq, 0, sizeof(_thread_sigq)); /* 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 (__sys_sigaction(i, NULL, &_thread_sigact[i - 1]) != 0) { /* * Abort this process if signal * initialisation fails: */ 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 (__sys_sigaction(_SCHED_SIGNAL, &act, NULL) != 0 || __sys_sigaction(SIGINFO, &act, NULL) != 0 || __sys_sigaction(SIGCHLD, &act, NULL) != 0) { /* * Abort this process if signal initialisation fails: */ PANIC("Cannot initialise 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: */ __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) { /* * 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) { /* Avoid accesses to file descriptor table on exit: */ _thread_dtablesize = 0; /* * Cannot allocate memory for the file descriptor * table, so abort this process. */ PANIC("Cannot allocate memory for file descriptor table"); } /* Allocate memory for the pollfd table: */ if ((_thread_pfd_table = (struct pollfd *) malloc(sizeof(struct pollfd) * _thread_dtablesize)) == NULL) { /* * Cannot allocate memory for the file descriptor * table, so abort this process. */ PANIC("Cannot allocate memory for pollfd 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; } /* Initialize stdio file descriptor table entries: */ for (i = 0; i < 3; i++) { if ((_thread_fd_table_init(i) != 0) && (errno != EBADF)) PANIC("Cannot initialize stdio file " "descriptor table entry"); } } } #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"); } int _thread_autoinit_dummy_decl = 0;