Impl time for macOS

core/os/os_osx.odin

@@ -126,6 +126,14 @@ W_OK :: 2; // Test for write permission
 X_OK :: 1; // Test for execute permission
 F_OK :: 0; // Test for file existance
 
+TimeSpec :: struct {
+	tv_sec  : i64,  /* seconds */
+	tv_nsec : i64,  /* nanoseconds */
+};
+
+CLOCK_SYSTEM          :: 0;
+CLOCK_CALENDAR        :: 1;
+
 foreign libc {
 	@(link_name="open")    _unix_open    :: proc(path: cstring, flags: int, #c_vararg mode: ..any) -> Handle ---;
 	@(link_name="close")   _unix_close   :: proc(handle: Handle) ---;
@@ -142,6 +150,10 @@ foreign libc {
 	@(link_name="realloc") _unix_realloc :: proc(ptr: rawptr, size: int) -> rawptr ---;
 	@(link_name="getenv")  _unix_getenv  :: proc(cstring) -> cstring ---;
 
+	@(link_name="clock_gettime")    _unix_clock_gettime :: proc(clock_id: u64, timespec: ^TimeSpec) ---;
+	@(link_name="nanosleep")        _unix_nanosleep     :: proc(requested: ^TimeSpec, remaining: ^TimeSpec) -> int ---;
+	@(link_name="sleep")            _unix_sleep         :: proc(seconds: u64) -> int ---;
+
 	@(link_name="exit")    _unix_exit    :: proc(status: int) ---;
 }
 
@@ -259,6 +271,26 @@ exit :: inline proc(code: int) -> ! {
 }
 
 
+clock_gettime :: proc(clock_id: u64) -> TimeSpec {
+	ts : TimeSpec;
+	_unix_clock_gettime(clock_id, &ts);
+	return ts;
+}
+
+sleep :: proc(seconds: u64) -> int {
+
+	return _unix_sleep(seconds);
+}
+
+nanosleep :: proc(nanoseconds: i64) -> int {
+	assert(nanoseconds <= 999999999);
+	requested, remaining : TimeSpec;
+	requested = TimeSpec{tv_nsec = nanoseconds};
+
+	return _unix_nanosleep(&requested, &remaining);
+}
+
+
 current_thread_id :: proc "contextless" () -> int {
 	// return int(_unix_gettid());
 	return 0;