diff options
Diffstat (limited to 'nptl/pthread_clock_settime.c')
| -rw-r--r-- | nptl/pthread_clock_settime.c | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/nptl/pthread_clock_settime.c b/nptl/pthread_clock_settime.c index ef6dc18773..61002a8f74 100644 --- a/nptl/pthread_clock_settime.c +++ b/nptl/pthread_clock_settime.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> @@ -23,10 +24,33 @@ #if HP_TIMING_AVAIL -void -__pthread_clock_settime (hp_timing_t offset) +int +__pthread_clock_settime (clockid_t clock_id, hp_timing_t offset) { + /* 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. */ - THREAD_SETMEM (THREAD_SELF, cpuclock_offset, offset); + if (tid == 0 || tid == THREAD_GETMEM (THREAD_SELF, tid)) + /* Our own clock. */ + THREAD_SETMEM (THREAD_SELF, cpuclock_offset, 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. */ + thread->cpuclock_offset = offset; + } + + return 0; } #endif |