Function tryLockShared [src]

Prototype

pub fn tryLockShared(rwl: *DefaultRwLock) bool

Parameters

rwl: *DefaultRwLock

Source

  pub fn tryLockShared(rwl: *DefaultRwLock) bool {
    const state = @atomicLoad(usize, &rwl.state, .seq_cst);
    if (state & (IS_WRITING | WRITER_MASK) == 0) {
        _ = @cmpxchgStrong(
            usize,
            &rwl.state,
            state,
            state + READER,
            .seq_cst,
            .seq_cst,
        ) orelse return true;
    }

    if (rwl.mutex.tryLock()) {
        _ = @atomicRmw(usize, &rwl.state, .Add, READER, .seq_cst);
        rwl.mutex.unlock();
        return true;
    }

    return false;
}  