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| author | Florian Weimer <fweimer@redhat.com> | 2017-12-20 11:40:36 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2017-12-20 11:42:04 +0100 |
| commit | 8a26ad2ab7396bc94fd3cd7b25cba433908d30e1 (patch) | |
| tree | 3e87bff8b59daaa5c7564532cc48c8d53ee5f7db /nptl/Makefile | |
| parent | 5069ff32842c60c55f8b573ee66fe43f9ec364af (diff) | |
| download | glibc-8a26ad2ab7396bc94fd3cd7b25cba433908d30e1.tar.gz glibc-8a26ad2ab7396bc94fd3cd7b25cba433908d30e1.tar.xz glibc-8a26ad2ab7396bc94fd3cd7b25cba433908d30e1.zip | |
nptl: Implement pthread_self in libc.so [BZ #22635]
All binaries use TLS and thus need a properly set up TCB, so we can simply return its address directly, instead of forwarding to the libpthread implementation from libc. For versioned symbols, the dynamic linker checks that the soname matches the name supplied by the link editor, so a compatibility symbol in libpthread is needed. To avoid linking against the libpthread function in all cases, we would have to bump the symbol version of libpthread in libc.so and supply a compat symbol. This commit does not do that because the function implementation is so small, so the overhead by two active copies of the same function might well be smaller than the increase in symbol table size.
Diffstat (limited to 'nptl/Makefile')
| -rw-r--r-- | nptl/Makefile | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/nptl/Makefile b/nptl/Makefile index 60d036a1ea..ab8cc98728 100644 --- a/nptl/Makefile +++ b/nptl/Makefile @@ -31,7 +31,7 @@ install-lib-ldscripts := libpthread.so routines = alloca_cutoff forward libc-lowlevellock libc-cancellation \ libc-cleanup libc_pthread_init libc_multiple_threads \ - register-atfork unregister-atfork + register-atfork unregister-atfork pthread_self shared-only-routines = forward # We need to provide certain routines for compatibility with existing @@ -49,7 +49,7 @@ pthread-compat-wrappers = \ libpthread-routines = nptl-init vars events version pt-interp \ pthread_create pthread_exit pthread_detach \ pthread_join pthread_tryjoin pthread_timedjoin \ - pthread_self pthread_equal pthread_yield \ + compat-pthread_self pthread_equal pthread_yield \ pthread_getconcurrency pthread_setconcurrency \ pthread_getschedparam pthread_setschedparam \ pthread_setschedprio \ |