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authorFlorian Weimer <fweimer@redhat.com>2021-02-23 14:59:34 +0100
committerFlorian Weimer <fweimer@redhat.com>2021-02-23 14:59:34 +0100
commit5a664d7ae8e42d641a7b4b436987ff67ab483b08 (patch)
treed2530831e3613ab86b5f536341304ac8cc98f452 /elf
parent597d0267b5c4a925f0175837ec09df9f77e0a250 (diff)
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nptl: Move elision implementations into libc
The elision interfaces are closely aligned between the targets that
implement them, so declare them in the generic <lowlevellock.h>
file.

Empty .c stubs are provided, so that fewer makefile updates
under sysdeps are needed.  Also simplify initialization via
__libc_early_init.

The symbols __lll_clocklock_elision, __lll_lock_elision,
__lll_trylock_elision, __lll_unlock_elision, __pthread_force_elision
move into libc.  For the time being, non-hidden references are used
from libpthread to access them, but once that part of libpthread
is moved into libc, hidden symbols will be used again.  (Hidden
references seem desirable to reduce the likelihood of transactions
aborts.)
Diffstat (limited to 'elf')
-rw-r--r--elf/libc_early_init.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/elf/libc_early_init.c b/elf/libc_early_init.c
index 4755554f12..9b1901a706 100644
--- a/elf/libc_early_init.c
+++ b/elf/libc_early_init.c
@@ -17,8 +17,10 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <ctype.h>
+#include <elision-conf.h>
 #include <libc-early-init.h>
 #include <libc-internal.h>
+#include <lowlevellock.h>
 #include <sys/single_threaded.h>
 
 #ifdef SHARED
@@ -37,4 +39,8 @@ __libc_early_init (_Bool initial)
 #ifdef SHARED
   __libc_initial = initial;
 #endif
+
+#if ENABLE_ELISION_SUPPORT
+  __lll_elision_init ();
+#endif
 }