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Improve spin lock for atomic_mutex_lock

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gingerBill
2022-03-30 16:15:48 +01:00
parent 3a4630e6b4
commit 561b725b0e
1 changed files with 4 additions and 5 deletions
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core/sync/sync2/primitives_atomic.odin
+4 -5
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@@ -38,6 +38,9 @@ atomic_mutex_lock :: proc(m: ^Atomic_Mutex) {
}
}
// Set just in case 100 iterations did not do it
new_state = .Waiting
for {
if atomic_exchange_acquire(&m.state, .Waiting) == .Unlocked {
return
@@ -49,11 +52,7 @@ atomic_mutex_lock :: proc(m: ^Atomic_Mutex) {
}
switch v := atomic_exchange_acquire(&m.state, .Locked); v {
case .Unlocked:
// Okay
case: fallthrough
case .Locked, .Waiting:
if v := atomic_exchange_acquire(&m.state, .Locked); v != .Unlocked {
lock_slow(m, v)
}
}