mirror of
https://github.com/ziglang/zig.git
synced 2025-12-06 14:23:09 +00:00
70931dbdea
* move std.atomic.Atomic to std.atomic.Value * fix incorrect argument order passed to testing.expectEqual * make the functions be a thin wrapper over the atomic builtins and stick to the naming conventions. * remove pointless functions loadUnchecked and storeUnchecked. Instead, name the field `raw` instead of `value` (which is redundant with the type name). * simplify the tests by not passing every possible combination. Many cases were iterating over every possible combinations but then not even using the for loop element value! * remove the redundant compile errors which are already implemented by the language itself. * remove dead x86 inline assembly. this should be implemented in the language if at all.
46 lines
1.1 KiB
Zig
46 lines
1.1 KiB
Zig
const std = @import("std");
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const assert = std.debug.assert;
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const WaitGroup = @This();
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const is_waiting: usize = 1 << 0;
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const one_pending: usize = 1 << 1;
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state: std.atomic.Value(usize) = std.atomic.Value(usize).init(0),
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event: std.Thread.ResetEvent = .{},
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pub fn start(self: *WaitGroup) void {
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const state = self.state.fetchAdd(one_pending, .Monotonic);
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assert((state / one_pending) < (std.math.maxInt(usize) / one_pending));
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}
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pub fn finish(self: *WaitGroup) void {
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const state = self.state.fetchSub(one_pending, .Release);
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assert((state / one_pending) > 0);
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if (state == (one_pending | is_waiting)) {
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self.state.fence(.Acquire);
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self.event.set();
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}
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}
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pub fn wait(self: *WaitGroup) void {
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const state = self.state.fetchAdd(is_waiting, .Acquire);
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assert(state & is_waiting == 0);
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if ((state / one_pending) > 0) {
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self.event.wait();
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}
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}
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pub fn reset(self: *WaitGroup) void {
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self.state.store(0, .Monotonic);
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self.event.reset();
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}
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pub fn isDone(wg: *WaitGroup) bool {
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const state = wg.state.load(.Acquire);
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assert(state & is_waiting == 0);
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return (state / one_pending) == 0;
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}
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