1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86_64/lock.s b/arch/x86_64/lock.s
new file mode 100644
index 0000000..b63f078
--- /dev/null
+++ b/arch/x86_64/lock.s
@@ -0,0 +1,19 @@
+.global _mtx_acquire
+.type _mtx_acquire @function
+_mtx_acquire:
+    lock btsw $0, (%rdi)
+    jc .spin
+    ret
+.spin:
+    pause
+    testb $1, (%rdi)
+    jnz .spin
+    jmp _mtx_acquire
+.size _mtx_acquire, . - _mtx_acquire
+
+.global _mtx_release
+.type _mtx_release @function
+_mtx_release:
+    movb $0, (%rdi)
+    ret
+.size _mtx_release, . - _mtx_release