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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-02-21 13:33:54 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-05-14 08:48:02 -0300 |
| commit | c50e1c263ec15e98da3235e663049156fd1afcfa (patch) | |
| tree | 47d22df898622b32fdc262f830978f29d6fa800e /ChangeLog | |
| parent | 959aff9fa22c45e0fa11cd88c9f8ea10bd9ba494 (diff) | |
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x86: Remove arch-specific low level lock implementation
This patch removes the arch-specific x86 assembly implementation for
low level locking and consolidate both 64 bits and 32 bits in a
single implementation.
Different than other architectures, x86 lll_trylock, lll_lock, and
lll_unlock implements a single-thread optimization to avoid atomic
operation, using cmpxchgl instead. This patch implements by using
the new single-thread.h definitions in a generic way, although using
the previous semantic.
The lll_cond_trylock, lll_cond_lock, and lll_timedlock just use
atomic operations plus calls to lll_lock_wait*.
For __lll_lock_wait_private and __lll_lock_wait the generic implemtation
there is no indication that assembly implementation is required
performance-wise.
Checked on x86_64-linux-gnu and i686-linux-gnu.
* sysdeps/nptl/lowlevellock.h (__lll_trylock): New macro.
(lll_trylock): Call __lll_trylock.
* sysdeps/unix/sysv/linux/i386/libc-lowlevellock.S: Remove file.
* sysdeps/unix/sysv/linux/i386/lll_timedlock_wait.c: Likewise.
* sysdeps/unix/sysv/linux/i386/lowlevellock.S: Likewise.
* sysdeps/unix/sysv/linux/i386/lowlevellock.h: Likewise.
* sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S: Likewise.
* sysdeps/unix/sysv/linux/x86_64/lll_timedlock_wait.c: Likewise.
* sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: Likewise.
* sysdeps/unix/sysv/linux/x86_64/lowlevellock.h: Likewise.
* sysdeps/unix/sysv/linux/x86/lowlevellock.h: New file.
* sysdeps/unix/sysv/linux/x86_64/cancellation.S: Include
lowlevellock-futex.h.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -1,5 +1,19 @@ 2019-05-14 Adhemerval Zanella <adhemerval.zanella@linaro.org> + * sysdeps/nptl/lowlevellock.h (__lll_trylock): New macro. + (lll_trylock): Call __lll_trylock. + * sysdeps/unix/sysv/linux/i386/libc-lowlevellock.S: Remove file. + * sysdeps/unix/sysv/linux/i386/lll_timedlock_wait.c: Likewise. + * sysdeps/unix/sysv/linux/i386/lowlevellock.S: Likewise. + * sysdeps/unix/sysv/linux/i386/lowlevellock.h: Likewise. + * sysdeps/unix/sysv/linux/x86_64/libc-lowlevellock.S: Likewise. + * sysdeps/unix/sysv/linux/x86_64/lll_timedlock_wait.c: Likewise. + * sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: Likewise. + * sysdeps/unix/sysv/linux/x86_64/lowlevellock.h: Likewise. + * sysdeps/unix/sysv/linux/x86/lowlevellock.h: New file. + * sysdeps/unix/sysv/linux/x86_64/cancellation.S: Include + lowlevellock-futex.h. + * nptl/nptl-init.c (__pthread_initialize_minimal_internal): Remove initialization for LLL_LOCK_INITIALIZER different than 0. * nptl/old_pthread_cond_broadcast.c (__pthread_cond_broadcast_2_0): |