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authorIngo Molnar <mingo@elte.hu>2006-03-27 01:16:22 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:44:49 -0800
commit0771dfefc9e538f077d0b43b6dec19a5a67d0e70 (patch)
tree696267e69228b7406b337f9651dedc75055a589e /include/linux/threads.h
parente9056f13bfcdd054a0c3d730e4e096748d8a363a (diff)
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[PATCH] lightweight robust futexes: core
Add the core infrastructure for robust futexes: structure definitions, the new syscalls and the do_exit() based cleanup mechanism. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Arjan van de Ven <arjan@infradead.org> Acked-by: Ulrich Drepper <drepper@redhat.com> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/threads.h')
-rw-r--r--include/linux/threads.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/threads.h b/include/linux/threads.h
index b59738a..e646bcd 100644
--- a/include/linux/threads.h
+++ b/include/linux/threads.h
@@ -28,7 +28,8 @@
#define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
/*
- * A maximum of 4 million PIDs should be enough for a while:
+ * A maximum of 4 million PIDs should be enough for a while.
+ * [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.]
*/
#define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
(sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))