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/* Deallocate the kernel thread resources. Mach version.
Copyright (C) 2000-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <mach.h>
#include <mach/mig_support.h>
#include <pt-internal.h>
/* Terminate the kernel thread associated with THREAD, and deallocate its
right reference and its stack. The function also drops a reference
on THREAD. */
void
__pthread_thread_terminate (struct __pthread *thread)
{
thread_t kernel_thread, self_ktid;
mach_port_t wakeup_port, reply_port;
void *stackaddr;
size_t stacksize;
error_t err;
int self;
kernel_thread = thread->kernel_thread;
if (thread->stack)
{
stackaddr = thread->stackaddr;
stacksize = ((thread->guardsize + __vm_page_size - 1)
/ __vm_page_size) * __vm_page_size + thread->stacksize;
}
else
{
stackaddr = NULL;
stacksize = 0;
}
wakeup_port = thread->wakeupmsg.msgh_remote_port;
self_ktid = __mach_thread_self ();
self = self_ktid == kernel_thread;
__mach_port_deallocate (__mach_task_self (), self_ktid);
/* The kernel thread won't be there any more. */
thread->kernel_thread = MACH_PORT_DEAD;
/* Release thread resources. */
__pthread_dealloc (thread);
/* The wake up port (needed for locks in __pthread_dealloc) is now no longer
needed. */
__mach_port_destroy (__mach_task_self (), wakeup_port);
/* Each thread has its own reply port, allocated from MiG stub code calling
__mig_get_reply_port. Destroying it is a bit tricky because the calls
involved are also RPCs, causing the creation of a new reply port if
currently null. The __thread_terminate_release call is actually a one way
simple routine designed not to require a reply port. */
reply_port = self ? __mig_get_reply_port () : MACH_PORT_NULL;
/* From here we shall not use a MIG reply port any more. */
/* Finally done with the thread structure (we still needed it to access the
reply port). */
__pthread_dealloc_finish (thread);
/* Terminate and release all that's left. */
err = __thread_terminate_release (kernel_thread, mach_task_self (),
kernel_thread, reply_port,
(vm_address_t) stackaddr, stacksize);
/* The kernel does not support it yet. Leak but at least terminate
correctly. */
err = __thread_terminate (kernel_thread);
/* We are out of luck. */
assert_perror (err);
}
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