/* Function to determine if a thread group is single threaded or not
 *
 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * - Derived from security/selinux/hooks.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#include <linux/sched.h>

/*
 * Returns true if the task does not share ->mm with another thread/process.
 */
bool current_is_single_threaded(void)
{
	struct task_struct *task = current;
	struct mm_struct *mm = task->mm;
	struct task_struct *p, *t;
	bool ret;

	if (atomic_read(&task->signal->live) != 1)
		return false;

	if (atomic_read(&mm->mm_users) == 1)
		return true;

	ret = false;
	rcu_read_lock();
	for_each_process(p) {
		if (unlikely(p->flags & PF_KTHREAD))
			continue;
		if (unlikely(p == task->group_leader))
			continue;

		for_each_thread(p, t) {
			if (unlikely(t->mm == mm))
				goto found;
			if (likely(t->mm))
				break;
			/*
			 * t->mm == NULL. Make sure next_thread/next_task
			 * will see other CLONE_VM tasks which might be
			 * forked before exiting.
			 */
			smp_rmb();
		}
	}
	ret = true;
found:
	rcu_read_unlock();

	return ret;
}
>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
<table class='tabs'><tr><td>
<a href='/cgit.cgi/linux/net-next.git/'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?id=219189e764be35372c298bee6492fc4c870b6ffd'>refs</a><a class='active' href='/cgit.cgi/linux/net-next.git/log/include/crypto/sha1_base.h?showmsg=1'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/include/crypto/sha1_base.h?id=219189e764be35372c298bee6492fc4c870b6ffd'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/include/crypto/sha1_base.h?id=219189e764be35372c298bee6492fc4c870b6ffd'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/include/crypto/sha1_base.h?id=219189e764be35372c298bee6492fc4c870b6ffd'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/crypto/sha1_base.h'>
<input type='hidden' name='id' value='219189e764be35372c298bee6492fc4c870b6ffd'/><input type='hidden' name='showmsg' value='1'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=219189e764be35372c298bee6492fc4c870b6ffd&amp;showmsg=1'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?id=219189e764be35372c298bee6492fc4c870b6ffd&amp;showmsg=1'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/crypto?id=219189e764be35372c298bee6492fc4c870b6ffd&amp;showmsg=1'>crypto</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/crypto/sha1_base.h?id=219189e764be35372c298bee6492fc4c870b6ffd&amp;showmsg=1'>sha1_base.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/crypto/sha1_base.h?id=219189e764be35372c298bee6492fc4c870b6ffd'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
7e889a220ffbf'/><input type='hidden' name='id2' value='b98acbff9a05b371c5f0ca6e44a3af8ce9274379'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=206c4720092d2a24bfefc041b377e889a220ffbf&amp;id2=b98acbff9a05b371c5f0ca6e44a3af8ce9274379'>Diffstat</a> (limited to 'net/caif/cfrfml.c')</div><table summary='diffstat' class='diffstat'>