unix: implement cpu_relax() for riscv64 (#5019)

Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
2026-02-05 05:46:14 +08:00 · 2026-02-05 05:46:14 +08:00 · e50d4e672e
commit e50d4e672e
parent 885613f1fe
1 changed files with 2 additions and 0 deletions
--- a/src/unix/async.c
+++ b/src/unix/async.c
@ -414,5 +414,7 @@ static void uv__cpu_relax(void) {
  __asm volatile ("" : : : "memory");
 #elif !defined(__APPLE__) && (defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__))
  __asm__ __volatile__ ("or 1,1,1; or 2,2,2" ::: "memory");
+#elif defined(__riscv) && __riscv_xlen == 64
+  __asm__ volatile(".insn 0x0100000f" ::: "memory");  /* FENCE */
 #endif
 }