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Diffstat (limited to 'tapset/atomic.stp')
| -rw-r--r-- | tapset/atomic.stp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/tapset/atomic.stp b/tapset/atomic.stp new file mode 100644 index 00000000..d0581455 --- /dev/null +++ b/tapset/atomic.stp @@ -0,0 +1,19 @@ +// Atomic functions. +// Copyright (C) 2010 Red Hat Inc. +// +// This file is part of systemtap, and is free software. You can +// redistribute it and/or modify it under the terms of the GNU General +// Public License (GPL); either version 2, or (at your option) any +// later version. + +function atomic_long_read:long(addr:long) +%{ /* pure */ + atomic_long_t *a = (atomic_long_t *)(long)THIS->addr; + + /* We call deref() here to ensure the memory is valid to read. + * Note the result is thrown away, then we use the "real" + * atomic read function now that we know the address is safe. */ + (void)deref(sizeof(*a), a); + THIS->__retvalue = atomic_long_read(a); + CATCH_DEREF_FAULT(); +%} |