File: getcpuclockid.c

package info (click to toggle)
llvm-toolchain-15 1%3A15.0.6-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,554,644 kB
  • sloc: cpp: 5,922,452; ansic: 1,012,136; asm: 674,362; python: 191,568; objc: 73,855; f90: 42,327; lisp: 31,913; pascal: 11,973; javascript: 10,144; sh: 9,421; perl: 7,447; ml: 5,527; awk: 3,523; makefile: 2,520; xml: 885; cs: 573; fortran: 567
file content (36 lines) | stat: -rw-r--r-- 717 bytes parent folder | download | duplicates (4) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
// RUN: %clang -pthread %s -Wl,-as-needed -o %t && %run %t
//
// UNSUPPORTED: darwin, solaris

#include <time.h>
#include <unistd.h>
#include <assert.h>
#include <pthread.h>

long cpu_ns() {
  clockid_t clk;
  struct timespec ts;
  int res = clock_getcpuclockid(getpid(), &clk);
  assert(!res);
  res = clock_gettime(clk, &ts);
  assert(!res);
  return ts.tv_nsec;
}

long th_cpu_ns() {
  clockid_t clk;
  struct timespec ts;
  int res = pthread_getcpuclockid(pthread_self(), &clk);
  assert(!res);
  res = clock_gettime(clk, &ts);
  assert(!res);
  return ts.tv_nsec;
}

int main() {
  long cpuns = cpu_ns();
  asm volatile ("" :: "r"(cpuns));
  cpuns = th_cpu_ns();
  asm volatile ("" :: "r"(cpuns));
  return 0;
}