43 lines
1.1 KiB
Zig
43 lines
1.1 KiB
Zig
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 async fn acquire(self: *Self) HeldLock {
|
|
return HeldLock{
|
|
// TODO guaranteed allocation elision
|
|
.held = self.lock.acquire(),
|
|
.value = &self.private_data,
|
|
};
|
|
}
|
|
};
|
|
}
|