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/* Start thread. Mach version.
Copyright (C) 2000-2020 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 <string.h>
#include <mach.h>
#include <pt-internal.h>
/* Prepare a wakeup message. */
static error_t
create_wakeupmsg (struct __pthread *thread)
{
kern_return_t err;
/* Build wakeup message. */
thread->wakeupmsg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND, 0);
thread->wakeupmsg.msgh_size = 0;
err = __mach_port_allocate (__mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
&thread->wakeupmsg.msgh_remote_port);
if (err)
return EAGAIN;
thread->wakeupmsg.msgh_local_port = MACH_PORT_NULL;
thread->wakeupmsg.msgh_seqno = 0;
thread->wakeupmsg.msgh_id = 0;
err = __mach_port_insert_right (__mach_task_self (),
thread->wakeupmsg.msgh_remote_port,
thread->wakeupmsg.msgh_remote_port,
MACH_MSG_TYPE_MAKE_SEND);
if (err)
{
__mach_port_destroy (__mach_task_self (),
thread->wakeupmsg.msgh_remote_port);
return EAGAIN;
}
/* No need to queue more than one wakeup message on this port. */
__mach_port_set_qlimit (__mach_task_self (),
thread->wakeupmsg.msgh_remote_port, 1);
return 0;
}
/* Allocate any resouces for THREAD. The new kernel thread should not
be eligible to be scheduled. */
int
__pthread_thread_alloc (struct __pthread *thread)
{
static int do_create;
error_t err;
err = create_wakeupmsg (thread);
if (err)
return err;
if (!do_create)
{
assert (__pthread_total == 0);
thread->kernel_thread = __mach_thread_self ();
do_create = 1;
}
else
{
err = __thread_create (__mach_task_self (), &thread->kernel_thread);
if (err)
{
__mach_port_destroy (__mach_task_self (),
thread->wakeupmsg.msgh_remote_port);
return EAGAIN;
}
}
return 0;
}
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