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