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/* Wakeup a thread. Viengoos version.
Copyright (C) 2008 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <pt-internal.h>
#include <hurd/stddef.h>
#include <hurd/futex.h>
#include <stdint.h>
/* Wakeup THREAD. */
void
__pthread_wakeup (struct __pthread *thread)
{
/* We need to loop here as the blocked thread may not yet be
blocked! Here's what happens when a thread blocks: it registers
itself as blocked, drops the relevant lock and then actually
blocks (via __pthread_block). This means that after dropping the
lock and before blocking, it may be interrupted and another
thread may try to wake it. */
long ret;
do
{
ret = futex_wake (&thread->threadid, INT_MAX);
assertx (ret <= 1, "tid: %x, ret: %d", thread->threadid, ret);
if (ret == 0)
l4_thread_switch (thread->threadid);
}
while (ret == 0);
}
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