diff options
Diffstat (limited to 'lib/libthr/thread/thr_create.c')
| -rw-r--r-- | lib/libthr/thread/thr_create.c | 241 |
1 files changed, 241 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..abab212 --- /dev/null +++ b/lib/libthr/thread/thr_create.c @@ -0,0 +1,241 @@ +/* + * Copyright (c) 2003 Daniel M. Eischen <deischen@gdeb.com> + * Copyright (c) 2005, David Xu <davidxu@freebsd.org> + * 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 unmodified, 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "namespace.h" +#include <sys/types.h> +#include <sys/rtprio.h> +#include <sys/signalvar.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <stddef.h> +#include <pthread.h> +#include "un-namespace.h" + +#include "thr_private.h" + +static int create_stack(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; + struct sched_param sched_param; + struct rtprio rtp; + int ret = 0, locked, create_suspended; + sigset_t set, oset; + + _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; + + new_thread->attr.prio = curthread->attr.prio; + new_thread->attr.sched_policy = curthread->attr.sched_policy; + } + + 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->cancel_enable = 1; + new_thread->cancel_async = 0; + /* Initialize the mutex queue: */ + TAILQ_INIT(&new_thread->mutexq); + TAILQ_INIT(&new_thread->pp_mutexq); + + /* Initialise hooks in the thread structure: */ + if (new_thread->attr.suspend == THR_CREATE_SUSPENDED) { + new_thread->flags = THR_FLAGS_NEED_SUSPEND; + create_suspended = 1; + } else { + create_suspended = 0; + } + + new_thread->state = PS_RUNNING; + + if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED) + new_thread->tlflags |= TLFLAGS_DETACHED; + + /* Add the new thread. */ + new_thread->refcount = 1; + _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; + if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) + param.rtp = NULL; + else { + sched_param.sched_priority = new_thread->attr.prio; + _schedparam_to_rtp(new_thread->attr.sched_policy, + &sched_param, &rtp); + param.rtp = &rtp; + } + + /* Schedule the new thread. */ + if (create_suspended) { + SIGFILLSET(set); + SIGDELSET(set, SIGTRAP); + __sys_sigprocmask(SIG_SETMASK, &set, &oset); + new_thread->sigmask = oset; + } + + ret = thr_new(¶m, sizeof(param)); + + if (ret != 0) { + ret = errno; + /* + * Translate EPROCLIM into well-known POSIX code EAGAIN. + */ + if (ret == EPROCLIM) + ret = EAGAIN; + } + + if (create_suspended) + __sys_sigprocmask(SIG_SETMASK, &oset, NULL); + + if (ret != 0) { + if (!locked) + THR_THREAD_LOCK(curthread, new_thread); + new_thread->state = PS_DEAD; + new_thread->tid = TID_TERMINATED; + if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) { + new_thread->cycle++; + _thr_umtx_wake(&new_thread->cycle, INT_MAX); + } + THR_THREAD_UNLOCK(curthread, new_thread); + THREAD_LIST_LOCK(curthread); + _thread_active_threads--; + new_thread->tlflags |= TLFLAGS_DETACHED; + _thr_ref_delete_unlocked(curthread, new_thread); + THREAD_LIST_UNLOCK(curthread); + (*thread) = 0; + } else if (locked) { + _thr_report_creation(curthread, new_thread); + THR_THREAD_UNLOCK(curthread, new_thread); + } + return (ret); +} + +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 +thread_start(struct pthread *curthread) +{ + if (curthread->attr.suspend == THR_CREATE_SUSPENDED) { + sigset_t set = curthread->sigmask; + + _thr_ast(curthread); + + /* + * Parent thread have stored signal mask for us, + * we should restore it now. + */ + sigprocmask(SIG_SETMASK, &set, NULL); + } + + /* + * This is used as a serialization point to allow parent + * to report 'new thread' event to debugger before the thread + * does real work. + */ + 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"); +} |
