8 files changed, 40 insertions, 0 deletions

diff --git a/src/utils/compilers.h b/src/utils/compilers.h
index 1b175bb..a2ae3ba 100644
--- a/src/utils/compilers.h
+++ b/src/utils/compilers.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_COMPILERS_H
+#define UTILS_COMPILERS_H
+
 #if defined(__GNUC__)
 
 #define UNUSED __attribute__((unused))
@@ -22,3 +25,5 @@ a[static N] notation for array parameters).
 #define NON_NULL
 
 #endif
+
+#endif /* UTILS_COMPILERS_H */
diff --git a/src/utils/constants.h b/src/utils/constants.h
index 3eed27d..3d0f6e3 100644
--- a/src/utils/constants.h
+++ b/src/utils/constants.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_CONSTANTS_H
+#define UTILS_CONSTANTS_H
+
 #define UINT8_BIT(i) (UINT8_C(1) << (uint8_t)(i))
 
 #define FACTORIAL_MAX UINT64_C(12)
@@ -42,3 +45,5 @@ STATIC uint64_t binomial[12][12] = {
         {1, 10, 45, 120, 210, 252, 210, 120,  45, 10,  1, 0},
         {1, 11, 55, 165, 330, 462, 462, 330, 165, 55, 11, 1},
 };
+
+#endif /* UTILS_CONSTANTS_H */
diff --git a/src/utils/dbg_log.h b/src/utils/dbg_log.h
index 08d42a3..f22260a 100644
--- a/src/utils/dbg_log.h
+++ b/src/utils/dbg_log.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_DBG_LOG_H
+#define UTILS_DBG_LOG_H
+
 #include <stdio.h>
 
 void (*nissy_log)(const char *, void *);
@@ -31,3 +34,5 @@ write_wrapper(void (*write)(const char *, void *), const char *str, ...)
 #define DBG_WARN(condition, ...)
 #define DBG_ASSERT(condition, ...)
 #endif
+
+#endif /* UTILS_DBG_LOG_H */
diff --git a/src/utils/math.h b/src/utils/math.h
index 0c56861..66ddaed 100644
--- a/src/utils/math.h
+++ b/src/utils/math.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_MATH_H
+#define UTILS_MATH_H
+
 #define SWAP(x, y) do { x ^= y; y ^= x; x ^= y; } while (0)
 #define MIN(x, y) ((x) < (y) ? (x) : (y))
 #define MAX(x, y) ((x) > (y) ? (x) : (y))
@@ -146,3 +149,5 @@ intpow(double b, uint64_t e)
 
         return e % 2 == 0 ? r * r : b * r * r;
 }
+
+#endif /* UTILS_MATH_H */
diff --git a/src/utils/prefetch.h b/src/utils/prefetch.h
index a2c41ef..30e364e 100644
--- a/src/utils/prefetch.h
+++ b/src/utils/prefetch.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_PREFETCH_H
+#define UTILS_PREFETCH_H
+
 #if defined(__GNUC__) || defined(__clang__)
     #define prefetch(a, i) __builtin_prefetch(a+i, 0, 0)
 #elif defined(AVX2)
@@ -5,3 +8,5 @@
 #else
     #define prefetch(a, i) (void)i
 #endif
+
+#endif /* UTILS_PREFETCH_H */
diff --git a/src/utils/sleep.h b/src/utils/sleep.h
index 7c0a84d..28bb807 100644
--- a/src/utils/sleep.h
+++ b/src/utils/sleep.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_SLEEP_H
+#define UTILS_SLEEP_H
+
 #define BASE_SLEEP_TIME 500
 
 STATIC void msleep(int);
@@ -50,3 +53,5 @@ msleep(int milliseconds)
 }
 
 #endif
+
+#endif /* UTILS_SLEEP_H */
diff --git a/src/utils/utils.h b/src/utils/utils.h
index e322f20..e320105 100644
--- a/src/utils/utils.h
+++ b/src/utils/utils.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_UTILS_H
+#define UTILS_UTILS_H
+
 #include "compilers.h"
 #include "dbg_log.h"
 #include "constants.h"
@@ -5,3 +8,5 @@
 #include "sleep.h"
 #include "wrapthread.h"
 #include "prefetch.h"
+
+#endif /* UTILS_UTILS_H */
diff --git a/src/utils/wrapthread.h b/src/utils/wrapthread.h
index 9578293..e88eb58 100644
--- a/src/utils/wrapthread.h
+++ b/src/utils/wrapthread.h
@@ -1,3 +1,6 @@
+#ifndef UTILS_WRAPTHREAD_H
+#define UTILS_WRAPTHREAD_H
+
 #if THREADS == 1
         #define WRAPTHREAD_NOTHREADS 1
 #elif defined(__unix__)
@@ -75,3 +78,5 @@
         #define wrapthread_mutex_unlock(a)
 
 #endif
+
+#endif /* UTILS_WRAPTHREAD_H */