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const std = @import("../std.zig");
const Lock = std.event.Lock;
/// Thread-safe async/await lock that protects one piece of data.
/// Functions which are waiting for the lock are suspended, and
/// are resumed when the lock is released, in order.
pub fn Locked(comptime T: type) type {
return struct {
lock: Lock,
private_data: T,
const Self = @This();
pub const HeldLock = struct {
value: *T,
held: Lock.Held,
pub fn release(self: HeldLock) void {
self.held.release();
}
};
pub fn init(data: T) Self {
return Self{
.lock = Lock.init(),
.private_data = data,
};
}
pub fn deinit(self: *Self) void {
self.lock.deinit();
}
pub fn acquire(self: *Self) callconv(.Async) HeldLock {
return HeldLock{
// TODO guaranteed allocation elision
.held = self.lock.acquire(),
.value = &self.private_data,
};
}
};
}
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