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a9667b5a85
* move concurrency primitives that always operate on kernel threads to the std.Thread namespace * remove std.SpinLock. Nobody should use this in a non-freestanding environment; the other primitives are always preferable. In freestanding, it will be necessary to put custom spin logic in there, so there are no use cases for a std lib version. * move some std lib files to the top level fields convention * add std.Thread.spinLoopHint * add std.Thread.Condition * add std.Thread.Semaphore * new implementation of std.Thread.Mutex for Windows and non-pthreads Linux * add std.Thread.RwLock Implementations provided by @kprotty
62 lines
1.3 KiB
Zig
62 lines
1.3 KiB
Zig
// SPDX-License-Identifier: MIT
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// Copyright (c) 2015-2020 Zig Contributors
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// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
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// The MIT license requires this copyright notice to be included in all copies
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// and substantial portions of the software.
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const std = @import("std");
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const WaitGroup = @This();
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lock: std.Thread.Mutex = .{},
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counter: usize = 0,
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event: std.Thread.ResetEvent,
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pub fn init(self: *WaitGroup) !void {
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self.* = .{
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.lock = .{},
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.counter = 0,
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.event = undefined,
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};
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try self.event.init();
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}
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pub fn deinit(self: *WaitGroup) void {
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self.event.deinit();
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self.* = undefined;
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}
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pub fn start(self: *WaitGroup) void {
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const held = self.lock.acquire();
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defer held.release();
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self.counter += 1;
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}
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pub fn finish(self: *WaitGroup) void {
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const held = self.lock.acquire();
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defer held.release();
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self.counter -= 1;
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if (self.counter == 0) {
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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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while (true) {
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const held = self.lock.acquire();
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if (self.counter == 0) {
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held.release();
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return;
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}
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held.release();
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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.event.reset();
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}
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