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authorRich Felker <dalias@aerifal.cx>2012-10-04 16:35:46 -0400
committerRich Felker <dalias@aerifal.cx>2012-10-04 16:35:46 -0400
commit8431d7972fd9be0fdcaff8516316d748e81724bb (patch)
tree53800c9deeaf26a9fedc5f9f574d9694315b510c /src/internal
parentadefe830dd376be386df5650a09c313c483adf1a (diff)
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TLS (GNU/C11 thread-local storage) support for static-linked programs
the design for TLS in dynamic-linked programs is mostly complete too,
but I have not yet implemented it. cost is nonzero but still low for
programs which do not use TLS and/or do not use threads (a few hundred
bytes of new code, plus dependency on memcpy). i believe it can be
made smaller at some point by merging __init_tls and __init_security
into __libc_start_main and avoiding duplicate auxv-parsing code.

at the same time, I've also slightly changed the logic pthread_create
uses to allocate guard pages to ensure that guard pages are not
counted towards commit charge.
Diffstat (limited to 'src/internal')
-rw-r--r--src/internal/libc.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/internal/libc.h b/src/internal/libc.h
index ea863d67..ca06f319 100644
--- a/src/internal/libc.h
+++ b/src/internal/libc.h
@@ -16,6 +16,7 @@ struct __libc {
 	int canceldisable;
 	FILE *ofl_head;
 	int ofl_lock[2];
+	volatile size_t tls_size, tls_cnt;
 };
 
 extern size_t __hwcap;