From 39ac40209b57d105dff28988a954a594e2e9dd8f Mon Sep 17 00:00:00 2001
From: Andrew Kelley <andrew@ziglang.org>
Date: Sat, 29 Nov 2025 07:36:44 -0800
Subject: std.Io.Threaded: use musl's beautiful pthread_cancel semantics

---
 lib/std/c.zig | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'lib/std/c.zig')

diff --git a/lib/std/c.zig b/lib/std/c.zig
index f22112a086..886c5e902c 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -10881,6 +10881,23 @@ pub extern "c" fn pthread_create(
     start_routine: *const fn (?*anyopaque) callconv(.c) ?*anyopaque,
     noalias arg: ?*anyopaque,
 ) E;
+pub const pthread_cancelstate = switch (native_os) {
+    .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => enum(c_int) {
+        ENABLE = 1,
+        DISABLE = 0,
+    },
+    .linux => if (native_abi.isMusl()) enum(c_int) {
+        ENABLE = 0,
+        DISABLE = 1,
+        MASKED = 2,
+    } else if (native_abi.isGnu()) enum(c_int) {
+        ENABLE = 0,
+        DISABLE = 1,
+    },
+    else => void,
+};
+pub extern "c" fn pthread_setcancelstate(pthread_cancelstate, ?*pthread_cancelstate) E;
+pub extern "c" fn pthread_cancel(pthread_t) E;
 pub extern "c" fn pthread_attr_init(attr: *pthread_attr_t) E;
 pub extern "c" fn pthread_attr_setstack(attr: *pthread_attr_t, stackaddr: *anyopaque, stacksize: usize) E;
 pub extern "c" fn pthread_attr_setstacksize(attr: *pthread_attr_t, stacksize: usize) E;
-- 
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