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| author | Guillaume Delbergue | 2016-06-08 20:55:23 +0200 |
|---|---|---|
| committer | Richard Henderson | 2016-06-12 01:10:18 +0200 |
| commit | ac9a9eba1e43c5354905c0c7f8e17852ed396ac2 (patch) | |
| tree | 97891a6037c6c942d770c3aba6c945d916a9fecc /scripts/switch-timer-api | |
| parent | include/processor.h: define cpu_relax() (diff) | |
| download | qemu-ac9a9eba1e43c5354905c0c7f8e17852ed396ac2.tar.gz qemu-ac9a9eba1e43c5354905c0c7f8e17852ed396ac2.tar.xz qemu-ac9a9eba1e43c5354905c0c7f8e17852ed396ac2.zip | |
qemu-thread: add simple test-and-set spinlock
Reviewed-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Signed-off-by: Guillaume Delbergue <guillaume.delbergue@greensocs.com>
[Rewritten. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
[Emilio's additions: use TAS instead of atomic_xchg; emit acquire/release
barriers; return bool from trylock; call cpu_relax() while spinning;
optimize for uncontended locks by acquiring the lock with TAS instead
of TATAS; add qemu_spin_locked().]
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1465412133-3029-6-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'scripts/switch-timer-api')
0 files changed, 0 insertions, 0 deletions