/* * 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. * * $FreeBSD$ */ #include #include #include #include #include #include #include #include #include #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) { struct itimerval itimer; 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: */ memset(new_thread, 0, sizeof(struct pthread)); new_thread->stack = stack; new_thread->start_routine = start_routine; new_thread->arg = arg; new_thread->cancelflags = PTHREAD_CANCEL_ENABLE | PTHREAD_CANCEL_DEFERRED; /* * Write a magic value to the thread structure * to help identify valid ones: */ new_thread->magic = PTHREAD_MAGIC; /* 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); /* Copy the thread attributes: */ memcpy(&new_thread->attr, pattr, sizeof(struct pthread_attr)); /* * 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; new_thread->inherited_priority = 0; /* Initialize joiner to NULL (no joiner): */ new_thread->joiner = NULL; /* Initialize the mutex queue: */ TAILQ_INIT(&new_thread->mutexq); /* Initialise hooks in the thread structure: */ new_thread->specific = NULL; new_thread->cleanup = NULL; new_thread->flags = 0; /* * Protect the scheduling queues. */ GIANT_LOCK(curthread); /* * Initialise the unique id which GDB uses to * track threads. */ new_thread->uniqueid = next_uniqueid++; /* * 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_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"); } GIANT_UNLOCK(curthread); /* 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"); }