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author | prime <prime@yandex-team.ru> | 2022-02-10 16:46:00 +0300 |
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committer | Daniil Cherednik <dcherednik@yandex-team.ru> | 2022-02-10 16:46:00 +0300 |
commit | 3695a7cd42b74a4987d8d5a8f2e2443556998943 (patch) | |
tree | ee79ee9294a61ee00e647684b3700d0a87e102a3 /contrib/restricted/abseil-cpp/absl/base/internal/spinlock.h | |
parent | 4d8b546b89b5afc08cf3667e176271c7ba935f33 (diff) | |
download | ydb-3695a7cd42b74a4987d8d5a8f2e2443556998943.tar.gz |
Restoring authorship annotation for <prime@yandex-team.ru>. Commit 1 of 2.
Diffstat (limited to 'contrib/restricted/abseil-cpp/absl/base/internal/spinlock.h')
-rw-r--r-- | contrib/restricted/abseil-cpp/absl/base/internal/spinlock.h | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/contrib/restricted/abseil-cpp/absl/base/internal/spinlock.h b/contrib/restricted/abseil-cpp/absl/base/internal/spinlock.h index ac40daff12..f00df6da26 100644 --- a/contrib/restricted/abseil-cpp/absl/base/internal/spinlock.h +++ b/contrib/restricted/abseil-cpp/absl/base/internal/spinlock.h @@ -15,7 +15,7 @@ // // Most users requiring mutual exclusion should use Mutex. -// SpinLock is provided for use in two situations: +// SpinLock is provided for use in two situations: // - for use by Abseil internal code that Mutex itself depends on // - for async signal safety (see below) @@ -139,20 +139,20 @@ class ABSL_LOCKABLE SpinLock { // // bit[0] encodes whether a lock is being held. // bit[1] encodes whether a lock uses cooperative scheduling. - // bit[2] encodes whether the current lock holder disabled scheduling when - // acquiring the lock. Only set when kSpinLockHeld is also set. + // bit[2] encodes whether the current lock holder disabled scheduling when + // acquiring the lock. Only set when kSpinLockHeld is also set. // bit[3:31] encodes time a lock spent on waiting as a 29-bit unsigned int. - // This is set by the lock holder to indicate how long it waited on - // the lock before eventually acquiring it. The number of cycles is - // encoded as a 29-bit unsigned int, or in the case that the current - // holder did not wait but another waiter is queued, the LSB - // (kSpinLockSleeper) is set. The implementation does not explicitly - // track the number of queued waiters beyond this. It must always be - // assumed that waiters may exist if the current holder was required to - // queue. - // - // Invariant: if the lock is not held, the value is either 0 or - // kSpinLockCooperative. + // This is set by the lock holder to indicate how long it waited on + // the lock before eventually acquiring it. The number of cycles is + // encoded as a 29-bit unsigned int, or in the case that the current + // holder did not wait but another waiter is queued, the LSB + // (kSpinLockSleeper) is set. The implementation does not explicitly + // track the number of queued waiters beyond this. It must always be + // assumed that waiters may exist if the current holder was required to + // queue. + // + // Invariant: if the lock is not held, the value is either 0 or + // kSpinLockCooperative. static constexpr uint32_t kSpinLockHeld = 1; static constexpr uint32_t kSpinLockCooperative = 2; static constexpr uint32_t kSpinLockDisabledScheduling = 4; |