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[libc] add more APIs of cmgxchg variants #91208

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Merged
merged 1 commit into from
May 6, 2024
Merged

[libc] add more APIs of cmgxchg variants #91208

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30 changes: 30 additions & 0 deletions libc/src/__support/CPP/atomic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,36 @@ template <typename T> struct Atomic {
int(mem_ord), int(mem_ord));
}

// Atomic compare exchange (separate success and failure memory orders)
bool compare_exchange_strong(
T &expected, T desired, MemoryOrder success_order,
MemoryOrder failure_order,
[[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
return __atomic_compare_exchange_n(&val, &expected, desired, false,
static_cast<int>(success_order),
static_cast<int>(failure_order));
}

// Atomic compare exchange (weak version)
bool compare_exchange_weak(
T &expected, T desired, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
[[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
return __atomic_compare_exchange_n(&val, &expected, desired, true,
static_cast<int>(mem_ord),
static_cast<int>(mem_ord));
}

// Atomic compare exchange (weak version with separate success and failure
// memory orders)
bool compare_exchange_weak(
T &expected, T desired, MemoryOrder success_order,
MemoryOrder failure_order,
[[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
return __atomic_compare_exchange_n(&val, &expected, desired, true,
static_cast<int>(success_order),
static_cast<int>(failure_order));
}

T exchange(T desired, MemoryOrder mem_ord = MemoryOrder::SEQ_CST,
[[maybe_unused]] MemoryScope mem_scope = MemoryScope::DEVICE) {
#if __has_builtin(__scoped_atomic_exchange_n)
Expand Down