add sync_core primitive

[urcu.git] / arch_x86.h

diff --git a/arch_x86.h b/arch_x86.h
index 4a2573e0f52934e3a2635516ad5f66cfd7c5c563..e7d945e3859393edece5eb4b2aee4c99538083e2 100644 (file)
--- a/arch_x86.h
+++ b/arch_x86.h
@@ -94,6 +94,14 @@ static inline void cpu_relax(void)
        rep_nop();
 }
 
+/*
+ * Serialize core instruction execution. Also acts as a compiler barrier.
+ */
+static inline void sync_core(void)
+{
+       asm volatile("cpuid" : : : "memory", "eax", "ebx", "ecx", "edx");
+}
+
 #define rdtscll(val)                                                     \
        do {                                                              \
             unsigned int __a, __d;                                       \