From d0283265ccaad2802e08f81992b906f873239d8e Mon Sep 17 00:00:00 2001
From: Danila Malyutin <flashmozzg@gmail.com>
Date: Wed, 19 Aug 2015 00:27:41 +0300
Subject: [PATCH] Improve clock_gettime on osx

and some clean up
---
 Utilities/GNU.cpp    | 52 +++++++++++++++++++++++++++++++++++++-------
 Utilities/GNU.h      | 19 +++++++++++-----
 rpcs3/CMakeLists.txt |  6 ++---
 3 files changed, 60 insertions(+), 17 deletions(-)

diff --git a/Utilities/GNU.cpp b/Utilities/GNU.cpp
index 9f21a344ba..70daa61441 100644
--- a/Utilities/GNU.cpp
+++ b/Utilities/GNU.cpp
@@ -1,16 +1,52 @@
 #include "GNU.h"
 
 #ifdef __APPLE__
-#include <time.h>
-#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/_types/_timespec.h>
+#include <mach/mach.h>
+#include <mach/clock.h>
+#include <mach/mach_time.h>
+#undef CPU_STATE_MAX
 
-int clock_gettime(int foo, struct timespec *ts) {
-	struct timeval tv;
+#define MT_NANO (+1.0E-9)
+#define MT_GIGA UINT64_C(1000000000)
 
-	gettimeofday(&tv, NULL);
-	ts->tv_sec = tv.tv_sec;
-	ts->tv_nsec = tv.tv_usec * 1000;
-	return(0);
+// TODO create a list of timers,
+static double mt_timebase = 0.0;
+static uint64_t mt_timestart = 0;
+
+// TODO be more careful in a multithreaded environement
+int clock_gettime(clockid_t clk_id, struct timespec *tp)
+{
+    kern_return_t retval = KERN_SUCCESS;
+    if( clk_id == TIMER_ABSTIME)
+    {
+        if (!mt_timestart) { // only one timer, initilized on the first call to the TIMER
+            mach_timebase_info_data_t tb = { 0 };
+            mach_timebase_info(&tb);
+            mt_timebase = tb.numer;
+            mt_timebase /= tb.denom;
+            mt_timestart = mach_absolute_time();
+        }
+
+        double diff = (mach_absolute_time() - mt_timestart) * mt_timebase;
+        tp->tv_sec = diff * MT_NANO;
+        tp->tv_nsec = diff - (tp->tv_sec * MT_GIGA);
+    }
+    else // other clk_ids are mapped to the coresponding mach clock_service
+    {
+        clock_serv_t cclock;
+        mach_timespec_t mts;
+
+        host_get_clock_service(mach_host_self(), clk_id, &cclock);
+        retval = clock_get_time(cclock, &mts);
+        mach_port_deallocate(mach_task_self(), cclock);
+
+        tp->tv_sec = mts.tv_sec;
+        tp->tv_nsec = mts.tv_nsec;
+    }
+
+    return retval;
 }
 #endif /* __APPLE__ */
 #if defined(__GNUG__)
diff --git a/Utilities/GNU.h b/Utilities/GNU.h
index 5caba7d525..a36085a745 100644
--- a/Utilities/GNU.h
+++ b/Utilities/GNU.h
@@ -68,12 +68,21 @@ inline int64_t  __mulh(int64_t a, int64_t b)
 
 #ifdef __APPLE__
 
-int clock_gettime(int foo, struct timespec *ts);
-#define wxIsNaN(x) ((x) != (x))
+// XXX only supports a single timer
+#define TIMER_ABSTIME -1
+/* The opengroup spec isn't clear on the mapping from REALTIME to CALENDAR
+ being appropriate or not.
+ http://pubs.opengroup.org/onlinepubs/009695299/basedefs/time.h.html */
+#define CLOCK_REALTIME  1 // #define CALENDAR_CLOCK 1 from mach/clock_types.h
+#define CLOCK_MONOTONIC 0 // #define SYSTEM_CLOCK 0
 
-#ifndef CLOCK_MONOTONIC
-#define CLOCK_MONOTONIC 0
-#endif /* !CLOCK_MONOTONIC */
+typedef int clockid_t;
+
+/* the mach kernel uses struct mach_timespec, so struct timespec
+    is loaded from <sys/_types/_timespec.h> for compatability */
+// struct timespec { time_t tv_sec; long tv_nsec; };
+
+int clock_gettime(clockid_t clk_id, struct timespec *tp);
 
 #endif /* __APPLE__ */
 
diff --git a/rpcs3/CMakeLists.txt b/rpcs3/CMakeLists.txt
index 4b2ffbfcf3..7d7677ff3d 100644
--- a/rpcs3/CMakeLists.txt
+++ b/rpcs3/CMakeLists.txt
@@ -1,7 +1,6 @@
 cmake_minimum_required(VERSION 2.8.12)
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake_modules")
-set(CMAKE_VERBOSE_MAKEFILE ON)
 include(cotire)
 
 project(rpcs3)
@@ -21,7 +20,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
 	add_compile_options(-Wno-attributes -Wno-enum-compare -Wno-invalid-offsetof)
 elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
 	if(APPLE)
-		add_compile_options(-stdlib=libc++) # TODO: stdlib?
+		add_compile_options(-stdlib=libc++)
 	endif()
 endif()
 
@@ -47,7 +46,7 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
 elseif(UNIX)
 	#it seems like glibc includes the iconv functions we use but other libc
 	#implementations like the one on OSX don't seem implement them
-	set(ADDITIONAL_LIBS "iconv")
+	set(ADDITIONAL_LIBS "iconv" "z")
 else()
 	set(ADDITIONAL_LIBS "")
 endif()
@@ -81,7 +80,6 @@ if(NOT WIN32)
 		)
 	endif()
 	find_package(GLEW REQUIRED)
-	message("${GLEW_LIBRARY} AND ${GLEW_INCLUDE_DIR}")
 endif()
 find_package(OpenGL REQUIRED)
 find_package(OpenAL REQUIRED)