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Diffstat (limited to 'lib/libkse/thread/thr_init.c')
-rw-r--r-- | lib/libkse/thread/thr_init.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/lib/libkse/thread/thr_init.c b/lib/libkse/thread/thr_init.c new file mode 100644 index 0000000..d044063 --- /dev/null +++ b/lib/libkse/thread/thr_init.c @@ -0,0 +1,214 @@ +/* + * Copyright (c) 1995 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 REGENTS 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. + * + */ + +/* Allocate space for global thread variables here: */ +#define GLOBAL_PTHREAD_PRIVATE + +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <unistd.h> +#include <sys/time.h> +#ifdef _THREAD_SAFE +#include <machine/reg.h> +#include <pthread.h> +#include "pthread_private.h" + +void +_thread_init(void) +{ + int flags; + int i; + struct sigaction act; + + /* Check if this function has already been called: */ + if (_thread_initial) { + /* Only initialise the threaded application once. */ + } + /* + * Create a pipe that is written to by the signal handler to prevent + * signals being missed in calls to _thread_sys_select: + */ + else 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"); + } + /* 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_thread, 0, sizeof(struct pthread)); + memset(_thread_initial, 0, sizeof(struct pthread)); + + /* Default the priority of the initial thread: */ + _thread_initial->pthread_priority = PTHREAD_DEFAULT_PRIORITY; + + /* Initialise the state of the initial thread: */ + _thread_initial->state = PS_RUNNING; + + /* Initialise the queue: */ + _thread_queue_init(&(_thread_initial->join_queue)); + + /* Initialise the rest of the fields: */ + _thread_initial->parent_thread = NULL; + _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_link_list = _thread_initial; + _thread_run = _thread_initial; + + /* 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, &act) != 0) { + /* + * Abort this process if signal + * initialisation fails: + */ + PANIC("Cannot read signal handler info"); + } + /* Set the signal handler for the initial thread: */ + else if (sigaction(i, &act, NULL) != 0) { + /* + * Abort this process if signal + * initialisation fails: + */ + PANIC("Cannot initialise signal handler for initial thread"); + } + } + + /* Initialise the global signal action structure: */ + sigfillset(&act.sa_mask); + act.sa_handler = (void (*) ()) _thread_sig_handler; + act.sa_flags = SA_RESTART; + + /* Enter a loop to initialise the rest of the signals: */ + for (i = 1; i < NSIG; i++) { + /* Check for signals which cannot be trapped: */ + if (i == SIGKILL || i == SIGSTOP) { + } + /* Initialise the signal for default handling: */ + else if (_thread_sys_sigaction(i, &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; + } + } + } + return; +} + +/* + * 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 +#else +/* + * A stub for non-threaded programs. + */ +void +_thread_init(void) +{ +} +#endif |