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| author | jeff <jeff@FreeBSD.org> | 2003-04-01 00:18:55 +0000 |
|---|---|---|
| committer | jeff <jeff@FreeBSD.org> | 2003-04-01 00:18:55 +0000 |
| commit | 420a77ecd5237fe6d8d85dfc52e0e7050554b768 (patch) | |
| tree | d76cda4e540786cf76f11bcb84ebefd1fd2bfd17 /sys/ia64 | |
| parent | 56865cc54968bbe0d21f2909d13cfade62bb789d (diff) | |
| download | FreeBSD-src-420a77ecd5237fe6d8d85dfc52e0e7050554b768.zip FreeBSD-src-420a77ecd5237fe6d8d85dfc52e0e7050554b768.tar.gz | |
- Define a new md function 'casuptr'. This atomically compares and sets
a pointer that is in user space. It will be used as the basic primitive
for a kernel supported user space lock implementation.
- Implement this function in x86's support.s
- Provide stubs that return -1 in all other architectures. Implementations
will follow along shortly.
Reviewed by: jake
Diffstat (limited to 'sys/ia64')
| -rw-r--r-- | sys/ia64/ia64/machdep.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/ia64/ia64/machdep.c b/sys/ia64/ia64/machdep.c index bdc8dca..fb16a72 100644 --- a/sys/ia64/ia64/machdep.c +++ b/sys/ia64/ia64/machdep.c @@ -1444,3 +1444,10 @@ ia64_rse_previous_frame(u_int64_t *bsp, int size) return bsp - size - rnats; } + +intptr_t +casuptr(intptr_t *p, intptr_t old, intptr_t new) +{ + return (-1); +} + |
