shithub: drawterm

Download patch

ref: 11729e23cb62f2e262afd4580906b6aca4f7a113
parent: 18dbc24cdfd2f6b1105589fbf261b528e7d35035
author: Sigrid <ftrvxmtrx@gmail.com>
date: Fri Jun 19 10:52:35 EDT 2020

arm64/tas: use atomic builtin when possible, fixes drawterm on aarch64 android

--- a/posix-arm64/tas.c	Fri Jun 19 10:19:42 2020
+++ b/posix-arm64/tas.c	Fri Jun 19 10:52:35 2020
@@ -1,9 +1,16 @@
 #include "u.h"
 #include "libc.h"
 
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
 int
 tas(int *x)
 {
+#if __has_builtin(__atomic_test_and_set) || (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 7)))
+	return __atomic_test_and_set(x, __ATOMIC_ACQ_REL);
+#else
 	int     v,t, i = 1;
 
 	__asm__ (
@@ -23,4 +30,5 @@
 		print("canlock: corrupted 0x%lux\n", v);
 		return 1;
 	}
+#endif
 }