diff options
Diffstat (limited to 'lib/libthr/thread/thr_create.c')
| -rw-r--r-- | lib/libthr/thread/thr_create.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/lib/libthr/thread/thr_create.c b/lib/libthr/thread/thr_create.c new file mode 100644 index 0000000..32ca697 --- /dev/null +++ b/lib/libthr/thread/thr_create.c @@ -0,0 +1,202 @@ +/* + * 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. + * + * $FreeBSD$ + */ +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <unistd.h> +#include <stddef.h> +#include <sys/time.h> +#include <machine/reg.h> +#include <pthread.h> +#include "thr_private.h" +#include "libc_private.h" + +static u_int64_t next_uniqueid = 1; + +#define OFF(f) offsetof(struct pthread, f) +int _thread_next_offset = OFF(tle.tqe_next); +int _thread_uniqueid_offset = OFF(uniqueid); +int _thread_state_offset = OFF(state); +int _thread_name_offset = OFF(name); +int _thread_ctx_offset = OFF(ctx); +#undef OFF + +int _thread_PS_RUNNING_value = PS_RUNNING; +int _thread_PS_DEAD_value = PS_DEAD; + +__weak_reference(_pthread_create, pthread_create); + +int +_pthread_create(pthread_t * thread, const pthread_attr_t * attr, + void *(*start_routine) (void *), void *arg) +{ + int f_gc = 0; + int ret = 0; + pthread_t gc_thread; + pthread_t new_thread; + pthread_attr_t pattr; + int flags; + void *stack; + + /* + * Locking functions in libc are required when there are + * threads other than the initial thread. + */ + __isthreaded = 1; + + /* Allocate memory for the thread structure: */ + if ((new_thread = (pthread_t) malloc(sizeof(struct pthread))) == NULL) + return (EAGAIN); + + /* Check if default thread attributes are required: */ + if (attr == NULL || *attr == NULL) + pattr = &pthread_attr_default; + else + pattr = *attr; + + /* Check if a stack was specified in the thread attributes: */ + if ((stack = pattr->stackaddr_attr) == NULL) { + stack = _thread_stack_alloc(pattr->stacksize_attr, + pattr->guardsize_attr); + if (stack == NULL) { + free(new_thread); + return (EAGAIN); + } + } + + /* Initialise the thread structure: */ + init_td_common(new_thread, pattr, 0); + new_thread->stack = stack; + new_thread->start_routine = start_routine; + new_thread->arg = arg; + + /* Initialise the machine context: */ + getcontext(&new_thread->ctx); + new_thread->ctx.uc_stack.ss_sp = new_thread->stack; + new_thread->ctx.uc_stack.ss_size = pattr->stacksize_attr; + makecontext(&new_thread->ctx, _thread_start, 0); + new_thread->arch_id = _set_curthread(&new_thread->ctx, new_thread, &ret); + if (ret != 0) { + if (pattr->stackaddr_attr == NULL) { + STACK_LOCK; + _thread_stack_free(new_thread->stack, + pattr->stacksize_attr, pattr->guardsize_attr); + STACK_UNLOCK; + } + free(new_thread); + return (ret); + } + + /* + * Check if this thread is to inherit the scheduling + * attributes from its parent: + */ + if (new_thread->attr.flags & PTHREAD_INHERIT_SCHED) { + /* Copy the scheduling attributes: */ + new_thread->base_priority = curthread->base_priority & + ~PTHREAD_SIGNAL_PRIORITY; + new_thread->attr.prio = curthread->base_priority & + ~PTHREAD_SIGNAL_PRIORITY; + new_thread->attr.sched_policy = curthread->attr.sched_policy; + } else { + /* + * Use just the thread priority, leaving the + * other scheduling attributes as their + * default values: + */ + new_thread->base_priority = new_thread->attr.prio; + } + new_thread->active_priority = new_thread->base_priority; + + /* + * Initialise the unique id which GDB uses to + * track threads. + */ + new_thread->uniqueid = next_uniqueid++; + + THREAD_LIST_LOCK; + + /* + * Check if the garbage collector thread + * needs to be started. + */ + f_gc = (TAILQ_FIRST(&_thread_list) == _thread_initial); + + /* Add the thread to the linked list of all threads: */ + TAILQ_INSERT_HEAD(&_thread_list, new_thread, tle); + + /* + * Create the thread. + * + */ + if (pattr->suspend == PTHREAD_CREATE_SUSPENDED) { + new_thread->flags |= PTHREAD_FLAGS_SUSPENDED; + flags = THR_SUSPENDED; + } else { + flags = 0; + } + + ret = thr_create(&new_thread->ctx, &new_thread->thr_id, flags); + + if (ret != 0) { + _thread_printf(STDERR_FILENO, "thr_create() == %d\n", ret); + PANIC("thr_create"); + } + + THREAD_LIST_UNLOCK; + + /* Return a pointer to the thread structure: */ + (*thread) = new_thread; + + /* + * Start a garbage collector thread + * if necessary. + */ + if (f_gc && pthread_create(&gc_thread,NULL, _thread_gc,NULL) != 0) + PANIC("Can't create gc thread"); + + return (0); +} + +void +_thread_start(void) +{ + + /* Run the current thread's start routine with argument: */ + pthread_exit(curthread->start_routine(curthread->arg)); + + /* This point should never be reached. */ + PANIC("Thread has resumed after exit"); +} |
