diff options
| author | Rich Felker <dalias@aerifal.cx> | 2013-06-08 11:36:41 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2013-06-08 11:36:41 -0400 |
| commit | ea200e38bd79723054c7ad97cbf87911eac5b7f5 (patch) | |
| tree | b4e065a5ed23be930dcf3ca33cf08d3f9a7ce023 /src | |
| parent | prng: make rand_r have 2^32 period instead of 2^31 (diff) | |
| download | grovel-ea200e38bd79723054c7ad97cbf87911eac5b7f5.tar.gz grovel-ea200e38bd79723054c7ad97cbf87911eac5b7f5.tar.xz | |
support cputime clocks for processes/threads other than self
apparently these features have been in Linux for a while now, so it
makes sense to support them. the bit twiddling seems utterly illogical
and wasteful, especially the negation, but that's how the kernel folks
chose to encode pids/tids into the clock id.
Diffstat (limited to 'src')
| -rw-r--r-- | src/thread/pthread_getcpuclockid.c | 3 | ||||
| -rw-r--r-- | src/time/clock_getcpuclockid.c | 7 |
2 files changed, 7 insertions, 3 deletions
diff --git a/src/thread/pthread_getcpuclockid.c b/src/thread/pthread_getcpuclockid.c index cf3d2b84..9df14fb6 100644 --- a/src/thread/pthread_getcpuclockid.c +++ b/src/thread/pthread_getcpuclockid.c @@ -2,5 +2,6 @@ int pthread_getcpuclockid(pthread_t t, clockid_t *clockid) { - return ENOSYS; + *clockid = (-t->tid-1)*8U + 6; + return 0; } diff --git a/src/time/clock_getcpuclockid.c b/src/time/clock_getcpuclockid.c index 723840b0..8a0e2d4c 100644 --- a/src/time/clock_getcpuclockid.c +++ b/src/time/clock_getcpuclockid.c @@ -5,7 +5,10 @@ int clock_getcpuclockid(pid_t pid, clockid_t *clk) { - if (pid && pid != getpid()) return EPERM; - *clk = CLOCK_PROCESS_CPUTIME_ID; + struct timespec ts; + clockid_t id = (-pid-1)*8U + 2; + int ret = __syscall(SYS_clock_getres, id, &ts); + if (ret) return -ret; + *clk = id; return 0; } |