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Diffstat (limited to 'lib/libthr/thread/thr_create.c')
| -rw-r--r-- | lib/libthr/thread/thr_create.c | 230 |
1 files changed, 230 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..774eaaa --- /dev/null +++ b/lib/libthr/thread/thr_create.c @@ -0,0 +1,230 @@ +/* + * Copyright (c) 2003 Daniel M. Eischen <deischen@gdeb.com> + * 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 <stddef.h> +#include <pthread.h> +#include <sys/signalvar.h> + +#include "thr_private.h" + +static void free_thread(struct pthread *curthread, struct pthread *thread); +static int create_stack(struct pthread_attr *pattr); +static void free_stack(struct pthread *curthread, struct pthread_attr *pattr); +static void thread_start(struct pthread *curthread); + +__weak_reference(_pthread_create, pthread_create); + +int +_pthread_create(pthread_t * thread, const pthread_attr_t * attr, + void *(*start_routine) (void *), void *arg) +{ + struct pthread *curthread, *new_thread; + struct thr_param param; + int ret = 0, locked; + + _thr_check_init(); + + /* + * Tell libc and others now they need lock to protect their data. + */ + if (_thr_isthreaded() == 0 && _thr_setthreaded(1)) + return (EAGAIN); + + curthread = _get_curthread(); + if ((new_thread = _thr_alloc(curthread)) == NULL) + return (EAGAIN); + + memset(¶m, 0, sizeof(param)); + + if (attr == NULL || *attr == NULL) + /* Use the default thread attributes: */ + new_thread->attr = _pthread_attr_default; + else + new_thread->attr = *(*attr); + if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { + /* inherit scheduling contention scope */ + if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) + new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; + else + new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; + /* + * scheduling policy and scheduling parameters will be + * inherited in following code. + */ + } + + if (_thr_scope_system > 0) + new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM; + else if (_thr_scope_system < 0) + new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM; + + new_thread->tid = TID_TERMINATED; + + if (create_stack(&new_thread->attr) != 0) { + /* Insufficient memory to create a stack: */ + _thr_free(curthread, new_thread); + return (EAGAIN); + } + /* + * Write a magic value to the thread structure + * to help identify valid ones: + */ + new_thread->magic = THR_MAGIC; + new_thread->start_routine = start_routine; + new_thread->arg = arg; + new_thread->cancelflags = PTHREAD_CANCEL_ENABLE | + PTHREAD_CANCEL_DEFERRED; + /* + * Check if this thread is to inherit the scheduling + * attributes from its parent: + */ + if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) { + /* + * Copy the scheduling attributes. Lock the scheduling + * lock to get consistent scheduling parameters. + */ + THR_LOCK(curthread); + new_thread->base_priority = curthread->base_priority; + new_thread->attr.prio = curthread->base_priority; + new_thread->attr.sched_policy = curthread->attr.sched_policy; + THR_UNLOCK(curthread); + } 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; + + /* Initialize the mutex queue: */ + TAILQ_INIT(&new_thread->mutexq); + TAILQ_INIT(&new_thread->pri_mutexq); + + /* Initialise hooks in the thread structure: */ + if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) + new_thread->flags = THR_FLAGS_SUSPENDED; + new_thread->state = PS_RUNNING; + + /* Add the new thread. */ + _thr_link(curthread, new_thread); + /* Return thread pointer eariler so that new thread can use it. */ + (*thread) = new_thread; + if (SHOULD_REPORT_EVENT(curthread, TD_CREATE)) { + THR_THREAD_LOCK(curthread, new_thread); + locked = 1; + } else + locked = 0; + param.start_func = (void (*)(void *)) thread_start; + param.arg = new_thread; + param.stack_base = new_thread->attr.stackaddr_attr; + param.stack_size = new_thread->attr.stacksize_attr; + param.tls_base = (char *)new_thread->tcb; + param.tls_size = sizeof(struct tcb); + param.child_tid = &new_thread->tid; + param.parent_tid = &new_thread->tid; + param.flags = 0; + if (new_thread->attr.flags & PTHREAD_SCOPE_SYSTEM) + param.flags |= THR_SYSTEM_SCOPE; + /* Schedule the new thread. */ + ret = thr_new(¶m, sizeof(param)); + if (ret != 0) { + if (locked) + THR_THREAD_UNLOCK(curthread, new_thread); + _thr_unlink(curthread, new_thread); + free_thread(curthread, new_thread); + (*thread) = 0; + ret = EAGAIN; + } else if (locked) { + _thr_report_creation(curthread, new_thread); + THR_THREAD_UNLOCK(curthread, new_thread); + } + return (ret); +} + +static void +free_thread(struct pthread *curthread, struct pthread *thread) +{ + free_stack(curthread, &thread->attr); + curthread->tid = TID_TERMINATED; + _thr_free(curthread, thread); +} + +static int +create_stack(struct pthread_attr *pattr) +{ + int ret; + + /* Check if a stack was specified in the thread attributes: */ + if ((pattr->stackaddr_attr) != NULL) { + pattr->guardsize_attr = 0; + pattr->flags |= THR_STACK_USER; + ret = 0; + } + else + ret = _thr_stack_alloc(pattr); + return (ret); +} + +static void +free_stack(struct pthread *curthread, struct pthread_attr *pattr) +{ + if ((pattr->flags & THR_STACK_USER) == 0) { + THREAD_LIST_LOCK(curthread); + /* Stack routines don't use malloc/free. */ + _thr_stack_free(pattr); + THREAD_LIST_UNLOCK(curthread); + } +} + +static void +thread_start(struct pthread *curthread) +{ + if (curthread->flags & THR_FLAGS_NEED_SUSPEND) + _thr_suspend_check(curthread); + + THR_LOCK(curthread); + THR_UNLOCK(curthread); + + /* 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"); +} |
