Add documentation for the random number generator

[fio.git] / os / os.h

diff --git a/os/os.h b/os/os.h
index a14c48578fc7774e998a0587525975dc1d28c3b8..d128f027e81c79e6bcdef2b32d75c8e5c49be74e 100644 (file)
--- a/os/os.h
+++ b/os/os.h
@@ -1,6 +1,9 @@
 #ifndef FIO_OS_H
 #define FIO_OS_H
 
+#include <sys/types.h>
+#include <unistd.h>
+
 #if defined(__linux__)
 #include "os-linux.h"
 #elif defined(__FreeBSD__)
@@ -124,4 +127,21 @@ static inline int blockdev_size(int fd, unsigned long long *bytes)
 }
 #endif
 
+#ifdef FIO_USE_GENERIC_RAND
+typedef unsigned int os_random_state_t;
+
+static inline void os_random_seed(unsigned long seed, os_random_state_t *rs)
+{
+       srand(seed);
+}
+
+static inline long os_random_long(os_random_state_t *rs)
+{
+       long val;
+
+       val = rand_r(rs);
+       return val;
+}
+#endif
+
 #endif