95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
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/* Start thread. 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 <string.h>
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#include <mach.h>
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#include <pt-internal.h>
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/* Prepare a wakeup message. */
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static error_t
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create_wakeupmsg (struct __pthread *thread)
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{
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kern_return_t err;
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/* Build wakeup message. */
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thread->wakeupmsg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND, 0);
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thread->wakeupmsg.msgh_size = 0;
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err = __mach_port_allocate (__mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
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&thread->wakeupmsg.msgh_remote_port);
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if (err)
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return EAGAIN;
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thread->wakeupmsg.msgh_local_port = MACH_PORT_NULL;
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thread->wakeupmsg.msgh_seqno = 0;
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thread->wakeupmsg.msgh_id = 0;
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err = __mach_port_insert_right (__mach_task_self (),
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thread->wakeupmsg.msgh_remote_port,
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thread->wakeupmsg.msgh_remote_port,
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MACH_MSG_TYPE_MAKE_SEND);
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if (err)
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{
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__mach_port_destroy (__mach_task_self (),
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thread->wakeupmsg.msgh_remote_port);
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return EAGAIN;
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}
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/* No need to queue more than one wakeup message on this port. */
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__mach_port_set_qlimit (__mach_task_self (),
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thread->wakeupmsg.msgh_remote_port, 1);
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return 0;
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}
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/* Allocate any resouces for THREAD. The new kernel thread should not
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be eligible to be scheduled. */
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int
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__pthread_thread_alloc (struct __pthread *thread)
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{
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static int do_create;
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error_t err;
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err = create_wakeupmsg (thread);
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if (err)
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return err;
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if (!do_create)
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{
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assert (__pthread_total == 0);
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thread->kernel_thread = __mach_thread_self ();
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do_create = 1;
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}
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else
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{
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err = __thread_create (__mach_task_self (), &thread->kernel_thread);
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if (err)
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{
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__mach_port_destroy (__mach_task_self (),
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thread->wakeupmsg.msgh_remote_port);
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return EAGAIN;
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}
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}
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return 0;
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}
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