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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2022-06-07 11:11:03 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2022-06-24 17:45:58 -0300
commitbaf2a265c71113a91f6971313ef191be9e77ef6a (patch)
treead894e8766707e8c10e98b6e4c857ab315fa0276 /posix
parent5b41b2659d35b72636ab50a28d6815cad9c22a66 (diff)
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misc: Optimize internal usage of __libc_single_threaded
By adding an internal alias to avoid the GOT indirection. On some architecture, __libc_single_thread may be accessed through copy relocations and thus it requires to update also the copies default copy. This is done by adding a new internal macro, libc_hidden_data_{proto,def}, which has an addition argument that specifies the alias name (instead of default __GI_ one). Checked on x86_64-linux-gnu and i686-linux-gnu. Reviewed-by: Fangrui Song <maskray@google.com>
Diffstat (limited to 'posix')
-rw-r--r--posix/fork.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/posix/fork.c b/posix/fork.c
index e1be342..987916a 100644
--- a/posix/fork.c
+++ b/posix/fork.c
@@ -45,7 +45,7 @@ __libc_fork (void)
requirement for fork (Austin Group tracker issue #62) this is
best effort to make is async-signal-safe at least for single-thread
case. */
- bool multiple_threads = __libc_single_threaded == 0;
+ bool multiple_threads = __libc_single_threaded_internal == 0;
uint64_t lastrun;
lastrun = __run_prefork_handlers (multiple_threads);