adding iris benchmark

[c11concurrency-benchmarks.git] / iris / include / define.h

diff --git a/iris/include/define.h b/iris/include/define.h
new file mode 100644 (file)
index 0000000..8ee1cf8
--- /dev/null
+++ b/iris/include/define.h
@@ -0,0 +1,33 @@
+#ifndef IRIS_DEFINE_H_
+#define IRIS_DEFINE_H_
+#include <sys/uio.h>
+
+namespace iris {
+
+#define iris_likely(x) __builtin_expect(!!(long)(x), 1)
+#define iris_unlikely(x) __builtin_expect(!!(long)(x), 0)
+
+struct loglet_t {
+    // @pbuffer holds formatter function address and arguments
+    char                                  * rbuf_ptr;
+    size_t                                  rbuf_alloc_size;
+    loglet_t(char * ptr = nullptr, size_t alloc_size = 0):rbuf_ptr(ptr), rbuf_alloc_size(alloc_size) {}
+};
+
+#if defined(IOV_MAX) /* Linux x86 (glibc-2.3.6-3) */
+    #define MAX_IOVECS IOV_MAX
+#elif defined(MAX_IOVEC) /* Linux ia64 (glibc-2.3.3-98.28) */
+    #define MAX_IOVECS MAX_IOVEC
+#elif defined(UIO_MAXIOV) /* Linux x86 (glibc-2.2.5-233) */
+    #define MAX_IOVECS UIO_MAXIOV
+#elif (defined(__FreeBSD__) && __FreeBSD_version < 500000) || defined(__DragonFly__) || defined(__APPLE__) 
+    /* - FreeBSD 4.x
+     * - MacOS X 10.3.x
+     *   (covered in -DKERNEL)
+     *  */
+    #define MAX_IOVECS 1024
+#else
+    #error "can't deduce the maximum number of iovec in a readv/writev syscall"
+#endif
+}
+#endif