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ompiler_rt: atomics: Split long lines and add comment on constants

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This commit is contained in:
Koakuma 2022-04-15 19:31:55 +07:00
parent 274e2a1ef1
commit 6aa89115f9
1 changed files with 7 additions and 1 deletions
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8
lib/std/special/compiler_rt/atomics.zig
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@ -43,9 +43,15 @@ const SpinlockTable = struct {
const max_spinlocks = 64;
const Spinlock = struct {
// SPARC ldstub instruction will write a 255 into the memory location.
// We'll use that as a sign that the lock is currently held.
// See also: Section B.7 in SPARCv8 spec & A.29 in SPARCv9 spec.
const sparc_lock: type = enum(u8) { Unlocked = 0, Locked = 255 };
const other_lock: type = enum(usize) { Unlocked = 0, Locked };
// Prevent false sharing by providing enough padding between two
// consecutive spinlock elements
v: if (arch.isSPARC()) enum(u8) { Unlocked = 0, Locked = 255 } else enum(usize) { Unlocked = 0, Locked } align(cache_line_size) = .Unlocked,
v: if (arch.isSPARC()) sparc_lock else other_lock align(cache_line_size) = .Unlocked,
fn acquire(self: *@This()) void {
while (true) {