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