diff options
author | neal <neal> | 2008-08-16 14:02:09 +0000 |
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committer | neal <neal> | 2008-08-16 14:02:09 +0000 |
commit | 4c77d66ee24a1e44d369fd935dd48694f30ad82d (patch) | |
tree | 7530b9335ea349d0e10935ee5ecc2742ac4aff74 /libpthread/sysdeps/viengoos/pt-spin.c | |
parent | 3806effa5d0eddb1262bb6eb7ab6d381570948dd (diff) |
2008-08-16 Neal H. Walfield <neal@gnu.org>
* Makefile.am (SYSDEP_PATH): Replace l4/hurd with viengoos.
Remove other directory names containing l4.
(libpthread_a_SOURCES): Remove pt-pool-np.c.
* sysdeps/l4/pt-spin.c: Move from here...
* sysdeps/viengoos/pt-spin.c: ... to here.
* sysdeps/l4/pt-stack-alloc.c: Move from here...
* sysdeps/viengoos/pt-stack-alloc.c: ... to here.
* sysdeps/l4/pt-timedblock.c: Move from here...
* sysdeps/viengoos/pt-timedblock.c: ... to here.
* sysdeps/l4/hurd/pt-block.c: Move from here...
* sysdeps/viengoos/pt-block.c: ... to here.
* sysdeps/l4/hurd/pt-docancel.c: Move from here...
* sysdeps/viengoos/pt-docancel.c: ... to here.
* sysdeps/l4/hurd/pt-kill.c: Move from here...
* sysdeps/viengoos/pt-kill.c: ... to here.
* sysdeps/l4/hurd/pt-setactivity-np.c: Move from here...
* sysdeps/viengoos/pt-setactivity-np.c: ... to here.
* sysdeps/l4/hurd/pt-sigstate-destroy.c: Move from here...
* sysdeps/viengoos/pt-sigstate-destroy.c: ... to here.
* sysdeps/l4/hurd/pt-sigstate-init.c: Move from here...
* sysdeps/viengoos/pt-sigstate-init.c: ... to here.
* sysdeps/l4/hurd/pt-sigstate.c: Move from here...
* sysdeps/viengoos/pt-sigstate.c: ... to here.
* sysdeps/l4/hurd/pt-startup.c: Move from here...
* sysdeps/viengoos/pt-startup.c: ... to here.
* sysdeps/l4/hurd/pt-sysdep.c: Move from here...
* sysdeps/viengoos/pt-sysdep.c: ... to here.
* sysdeps/l4/hurd/pt-sysdep.h: Move from here...
* sysdeps/viengoos/pt-sysdep.h: ... to here.
* sysdeps/l4/hurd/pt-thread-alloc.c: Move from here...
* sysdeps/viengoos/pt-thread-alloc.c: ... to here.
* sysdeps/l4/hurd/pt-thread-dealloc.c: Move from here...
* sysdeps/viengoos/pt-thread-dealloc.c: ... to here.
* sysdeps/l4/hurd/pt-thread-halt.c: Move from here...
* sysdeps/viengoos/pt-thread-halt.c: ... to here.
* sysdeps/l4/hurd/pt-thread-start.c: Move from here...
* sysdeps/viengoos/pt-thread-start.c: ... to here.
* sysdeps/l4/hurd/pt-wakeup.c: Move from here...
* sysdeps/viengoos/pt-wakeup.c: ... to here.
* sysdeps/l4/hurd/sig-sysdep.h: Move from here...
* sysdeps/viengoos/sig-sysdep.h: ... to here.
* sysdeps/l4/hurd/sigprocmask.c: Move from here...
* sysdeps/viengoos/sigprocmask.c: ... to here.
* sysdeps/l4/hurd/bits/pthread-np.h: Move from here...
* sysdeps/viengoos/bits/pthread-np.h: ... to here.
* headers.m4: Like sysroot/include/bits/pthread-np.h to
libpthread/sysdeps/viengoos/bits/pthread-np.h, not
libpthread/sysdeps/l4/hurd/bits/pthread-np.h.
* sysdeps/l4/hurd/ia32/pt-machdep.c: Move from here...
* sysdeps/viengoos/ia32/pt-machdep.c: ... to here.
* sysdeps/l4/hurd/ia32/pt-setup.c: Move from here...
* sysdeps/viengoos/ia32/pt-setup.c: ... to here.
* sysdeps/l4/hurd/ia32/signal-dispatch-lowlevel.c: Move from
here...
* sysdeps/viengoos/ia32/signal-dispatch-lowlevel.c: to here...
* sysdeps/l4/hurd/powerpc/pt-machdep.c: Move from here...
* sysdeps/viengoos/powerpc/pt-machdep.c: ... to here.
* sysdeps/l4/hurd/powerpc/pt-setup.c: Move from here...
* sysdeps/viengoos/powerpc/pt-setup.c: ... to here.
Diffstat (limited to 'libpthread/sysdeps/viengoos/pt-spin.c')
-rw-r--r-- | libpthread/sysdeps/viengoos/pt-spin.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/libpthread/sysdeps/viengoos/pt-spin.c b/libpthread/sysdeps/viengoos/pt-spin.c new file mode 100644 index 0000000..b6978b0 --- /dev/null +++ b/libpthread/sysdeps/viengoos/pt-spin.c @@ -0,0 +1,63 @@ +/* Spin locks. L4 version. + Copyright (C) 2000, 2004 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 + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <l4.h> + +#include <pthread.h> +#include <sched.h> + +/* The default for single processor machines; don't spin, it's + pointless. */ +#ifndef __PTHREAD_SPIN_COUNT +# define __PTHREAD_SPIN_COUNT 1 +#endif + +/* The number of times to spin while trying to lock a spin lock object + before yielding the processor. */ +int __pthread_spin_count = __PTHREAD_SPIN_COUNT; + + +/* Lock the spin lock object LOCK. If the lock is held by another + thread spin until it becomes available. */ +int +_pthread_spin_lock (__pthread_spinlock_t *lock) +{ + l4_time_t timeout; + int i; + + /* Start with a small timeout of 2 microseconds, then back off + exponentially. */ + timeout = l4_time_period (2); + + while (1) + { + for (i = 0; i < __pthread_spin_count; i++) + { + if (__pthread_spin_trylock (lock) == 0) + return 0; + } + l4_sleep (timeout); + + timeout = l4_time_mul2 (timeout); + if (timeout == L4_NEVER) + timeout = L4_TIME_PERIOD_MAX; + } +} + +weak_alias (_pthread_spin_lock, pthread_spin_lock); |