fix: timers on Linux

On Linux the clock() function measures cpu time instead of wall time. This change uses the Apple code path for Linux.

.gitignore

@@ -1,62 +0,0 @@
-# ---> C
-# Prerequisites
-*.d
-
-# Object files
-*.o
-*.ko
-*.obj
-*.elf
-
-# Linker output
-*.ilk
-*.map
-*.exp
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Libraries
-*.lib
-*.la
-*.lo
-
-# Shared objects (inc. Windows DLLs)
-*.dll
-*.so
-*.so.*
-*.dylib
-
-# Executables
-*.exe
-*.out
-*.app
-*.i*86
-*.x86_64
-*.hex
-Startcode/doble_initial
-Startcode/doble
-Startcode/unitTests
-
-# Debug files
-*.dSYM/
-*.su
-*.idb
-*.pdb
-
-# Kernel Module Compile Results
-*.mod*
-*.cmd
-.tmp_versions/
-modules.order
-Module.symvers
-Mkfile.old
-dkms.conf
-
-# IDE folders
-.vscode/
-.idea/
-
-# macOS
-.DS_Store

makefile

@@ -29,7 +29,7 @@ program_obj_files = stack.o bintree.o numbers.o timer.o highscore.o
 doble : main.o $(program_obj_files)
 	$(CC) $(FLAGS) $^ -o doble
 
-$(program_obj_files): %.o: %.c
+$(program_obj_filesobj_files): %.o: %.c
 	$(CC) -c $(FLAGS) $^ -o $@
 
 # --------------------------

timer.c

@@ -1,6 +1,12 @@
 #include "timer.h"
 
-#if __APPLE__
+#ifdef __linux__
+// Defines strict posix compliance for CLOCK_MONOTONIC
+#define _POSIX_C_SOURCE 199309L
+#include <time.h>
+#endif
+
+#if __APPLE__ || __linux__
 #include <sys/time.h>
 static struct timespec start = {0, 0};
 
@@ -21,7 +27,8 @@ double stopTimer()
 
     double measuredSeconds = (double)delta_us / 1000000.;
 
-    if(start.tv_nsec > 0) {
+    if (start.tv_nsec > 0)
+    {
         start.tv_nsec = 0;
         start.tv_sec = 0;
     }
@@ -45,7 +52,7 @@ double stopTimer()
 {
     double measuredSeconds = (clock() - (double)startClocks) / CLOCKS_PER_SEC;
 
-    if(startClocks > 0)
+    if (startClocks > 0)
         startClocks = 0;
     else
         measuredSeconds = -1;