diff options
Diffstat (limited to 'nptl/pthread_clock_gettime.c')
| -rw-r--r-- | nptl/pthread_clock_gettime.c | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/nptl/pthread_clock_gettime.c b/nptl/pthread_clock_gettime.c index 0e6f67bc96..a71174c9ca 100644 --- a/nptl/pthread_clock_gettime.c +++ b/nptl/pthread_clock_gettime.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2001, 2002 Free Software Foundation, Inc. +/* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -16,6 +16,7 @@ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <errno.h> #include <stdlib.h> #include <time.h> #include <libc-internal.h> @@ -24,15 +25,37 @@ #if HP_TIMING_AVAIL int -__pthread_clock_gettime (hp_timing_t freq, struct timespec *tp) +__pthread_clock_gettime (clockid_t clock_id, hp_timing_t freq, + struct timespec *tp) { hp_timing_t tsc; /* Get the current counter. */ HP_TIMING_NOW (tsc); + /* This is the ID of the thread we are looking for. */ + pid_t tid = ((unsigned int) clock_id) >> CLOCK_IDFIELD_SIZE; + /* Compute the offset since the start time of the process. */ - tsc -= THREAD_GETMEM (THREAD_SELF, cpuclock_offset); + if (tid == 0 || tid == THREAD_GETMEM (THREAD_SELF, tid)) + /* Our own clock. */ + tsc -= THREAD_GETMEM (THREAD_SELF, cpuclock_offset); + else + { + /* This is more complicated. We have to locate the thread based + on the ID. This means walking the list of existing + threads. */ + struct pthread *thread = __find_thread_by_id (tid); + if (thread == NULL) + { + __set_errno (EINVAL); + return -1; + } + + /* There is a race here. The thread might terminate and the stack + become unusable. But this is the user's problem. */ + tsc -= thread->cpuclock_offset; + } /* Compute the seconds. */ tp->tv_sec = tsc / freq; |