openflow build environment setup

openflow/include/click/machine.hh

@@ -0,0 +1,82 @@
+#ifndef CLICK_MACHINE_HH
+#define CLICK_MACHINE_HH 1
+#if CLICK_LINUXMODULE
+# include <click/cxxprotect.h>
+CLICK_CXX_PROTECT
+# include <linux/threads.h>
+# include <linux/sched.h>
+# if defined(CONFIG_SMP) && LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0)
+#  define num_possible_cpus()	smp_num_cpus
+# endif
+CLICK_CXX_UNPROTECT
+# include <click/cxxunprotect.h>
+#endif
+
+/** @brief Compiler fence.
+
+    Prevents reordering of loads and stores by the compiler. Not intended to
+    synchronize the processor's caches. */
+inline void
+click_compiler_fence()
+{
+    asm volatile("" : : : "memory");
+}
+
+/** @brief Compiler fence that relaxes the processor.
+
+    Use this in spinloops, for example. */
+inline void
+click_relax_fence()
+{
+#if CLICK_LINUXMODULE
+    cpu_relax();
+#elif HAVE_MULTITHREAD && (defined(__i386__) || defined(__arch_um__) || defined(__x86_64__))
+    asm volatile("rep; nop" : : : "memory"); // equivalent to "pause"
+#else
+    click_compiler_fence();
+#endif
+}
+
+/** @brief Full memory fence. */
+inline void
+click_fence()
+{
+#if CLICK_LINUXMODULE
+    smp_mb();
+#elif HAVE_MULTITHREAD && (defined(__i386__) || defined(__arch_um__) || defined(__x86_64__))
+    // GCC 4.2.1 on Mac has __sync_synchronize, but it doesn't work!
+    asm volatile("mfence" : : : "memory");
+#elif HAVE_MULTITHREAD && HAVE___SYNC_SYNCHRONIZE
+    __sync_synchronize();
+#else
+    click_compiler_fence();
+#endif
+}
+
+/** @brief Read memory fence.
+
+    On x86, equivalent to click_compiler_fence(). */
+inline void click_read_fence() {
+#if CLICK_LINUXMODULE
+    smp_rmb();
+#elif HAVE_MULTITHREAD && (defined(__i386__) || defined(__arch_um__) || defined(__x86_64__))
+    click_compiler_fence();
+#else
+    click_fence();
+#endif
+}
+
+/** @brief Write memory fence.
+
+    On x86, equivalent to click_compiler_fence(). */
+inline void click_write_fence() {
+#if CLICK_LINUXMODULE
+    smp_wmb();
+#elif HAVE_MULTITHREAD && (defined(__i386__) || defined(__arch_um__) || defined(__x86_64__))
+    click_compiler_fence();
+#else
+    click_fence();
+#endif
+}
+
+#endif