New function ovs_strerror() as a thread-safe replacement for strerror().

[sliver-openvswitch.git] / lib / util.h

diff --git a/lib/util.h b/lib/util.h
index c087b53..c71f027 100644 (file)
--- a/lib/util.h
+++ b/lib/util.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,8 +23,10 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include "compiler.h"
+#include "openvswitch/types.h"
 
 #ifndef va_copy
 #ifdef __va_copy
@@ -62,6 +64,17 @@
 #define BUILD_ASSERT_DECL_GCCONLY(EXPR) ((void) 0)
 #endif
 
+/* Like the standard assert macro, except:
+ *
+ *   - Writes the failure message to the log.
+ *
+ *   - Not affected by NDEBUG. */
+#define ovs_assert(CONDITION)                                           \
+    if (!OVS_LIKELY(CONDITION)) {                                       \
+        ovs_assert_failure(SOURCE_LOCATOR, __func__, #CONDITION);       \
+    }
+void ovs_assert_failure(const char *, const char *, const char *) NO_RETURN;
+
 /* Casts 'pointer' to 'type' and issues a compiler warning if the cast changes
  * anything other than an outermost "const" or "volatile" qualifier.
  *
@@ -201,6 +214,7 @@ void ovs_error(int err_no, const char *format, ...) PRINTF_FORMAT(2, 3);
 void ovs_error_valist(int err_no, const char *format, va_list)
     PRINTF_FORMAT(2, 0);
 const char *ovs_retval_to_string(int);
+const char *ovs_strerror(int);
 void ovs_hex_dump(FILE *, const void *, size_t, uintptr_t offset, bool ascii);
 
 bool str_to_int(const char *, int base, int *);
@@ -254,7 +268,7 @@ ctz(uint32_t n)
 
 int log_2_floor(uint32_t);
 int log_2_ceil(uint32_t);
-int popcount(uint32_t);
+unsigned int popcount(uint32_t);
 
 /* Returns the rightmost 1-bit in 'x' (e.g. 01011000 => 00001000), or 0 if 'x'
  * is 0. */
@@ -271,6 +285,27 @@ zero_rightmost_1bit(uintmax_t x)
 {
     return x & (x - 1);
 }
+
+/* Returns the index of the rightmost 1-bit in 'x' (e.g. 01011000 => 3), or 32
+ * if 'x' is 0.
+ *
+ * Unlike the other functions for rightmost 1-bits, this function only works
+ * with 32-bit integers. */
+static inline uint32_t
+rightmost_1bit_idx(uint32_t x)
+{
+    return x ? ctz(x) : 32;
+}
+
+/* Returns the index of the rightmost 1-bit in 'x' (e.g. 01011000 => 6), or 32
+ * if 'x' is 0.
+ *
+ * This function only works with 32-bit integers. */
+static inline uint32_t
+leftmost_1bit_idx(uint32_t x)
+{
+    return x ? log_2_floor(x) : 32;
+}
 \f
 bool is_all_zeros(const uint8_t *, size_t);
 bool is_all_ones(const uint8_t *, size_t);