diff options
Diffstat (limited to 'libc/nptl/pthread_getschedparam.c')
-rw-r--r-- | libc/nptl/pthread_getschedparam.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/libc/nptl/pthread_getschedparam.c b/libc/nptl/pthread_getschedparam.c new file mode 100644 index 000000000..434d86777 --- /dev/null +++ b/libc/nptl/pthread_getschedparam.c @@ -0,0 +1,81 @@ +/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <string.h> +#include "pthreadP.h" +#include <lowlevellock.h> + + +int +__pthread_getschedparam (threadid, policy, param) + pthread_t threadid; + int *policy; + struct sched_param *param; +{ + struct pthread *pd = (struct pthread *) threadid; + + /* Make sure the descriptor is valid. */ + if (INVALID_TD_P (pd)) + /* Not a valid thread handle. */ + return ESRCH; + + int result = 0; + + /* We have to handle cancellation in the following code since we are + locking another threads descriptor. */ + pthread_cleanup_push ((void (*) (void *)) lll_unlock_wake_cb, &pd->lock); + + lll_lock (pd->lock); + + /* The library is responsible for maintaining the values at all + times. If the user uses a interface other than + pthread_setschedparam to modify the scheduler setting it is not + the library's problem. In case the descriptor's values have + not yet been retrieved do it now. */ + if ((pd->flags & ATTR_FLAG_SCHED_SET) == 0) + { + if (__sched_getparam (pd->tid, &pd->schedparam) != 0) + result = 1; + else + pd->flags |= ATTR_FLAG_SCHED_SET; + } + + if ((pd->flags & ATTR_FLAG_POLICY_SET) == 0) + { + pd->schedpolicy = __sched_getscheduler (pd->tid); + if (pd->schedpolicy == -1) + result = 1; + else + pd->flags |= ATTR_FLAG_POLICY_SET; + } + + if (result == 0) + { + *policy = pd->schedpolicy; + memcpy (param, &pd->schedparam, sizeof (struct sched_param)); + } + + lll_unlock (pd->lock); + + pthread_cleanup_pop (0); + + return result; +} +strong_alias (__pthread_getschedparam, pthread_getschedparam) |