github.com/llvm-mirror/llgo@v0.0.0-20190322182713-bf6f0a60fce1/third_party/gofrontend/libgo/runtime/go-nanotime.c (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Return current time in nanoseconds.
     6  
     7  #include <sys/time.h>
     8  
     9  #include "runtime.h"
    10  
    11  int64 runtime_nanotime (void)
    12    __attribute__ ((no_split_stack));
    13  
    14  int64
    15  runtime_nanotime (void)
    16  {
    17    struct timeval tv;
    18  
    19    gettimeofday (&tv, NULL);
    20    return (int64) tv.tv_sec * 1000000000 + (int64) tv.tv_usec * 1000;
    21  }