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std: add option to use single-threaded event loop

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std.event.Loop does not yet work in single threaded builds. However,
using evented io on a single thread can be very convenient. This commit
allows settind @import("root").event_loop_mode to .single_threaded
in order to allow this without reimplementing the startup code in
start.zig
This commit is contained in:
Isaac Freund 2020-09-09 19:51:59 +02:00 • committed by Andrew Kelley
parent 4170f3f77f
commit 486a774e5f
1 changed files with 2 additions and 1 deletions
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3
lib/std/event/loop.zig
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@ -112,7 +112,8 @@ pub const Loop = struct {
/// have the correct pointer value.
/// https://github.com/ziglang/zig/issues/2761 and https://github.com/ziglang/zig/issues/2765
pub fn init(self: *Loop) !void {
if (builtin.single_threaded) {
if (builtin.single_threaded
or (@hasDecl(root, "event_loop_mode") and root.event_loop_mode == .single_threaded)) {
return self.initSingleThreaded();
} else {
return self.initMultiThreaded();