diff options
| author | danglin <danglin@138bc75d-0d04-0410-961f-82ee72b054a4> | 2008-11-23 21:14:59 +0000 |
|---|---|---|
| committer | danglin <danglin@138bc75d-0d04-0410-961f-82ee72b054a4> | 2008-11-23 21:14:59 +0000 |
| commit | 9068ac4664bcf3b108485a27ffeaf33a0e8fe2be (patch) | |
| tree | a8af9d8b8ac7d019a3f36cffaa8073bba82e0c93 /gcc/config/pa/linux-atomic.c | |
| parent | 615ce4a5067ac004155724bf598d3be32ac84aed (diff) | |
| download | gcc-9068ac4664bcf3b108485a27ffeaf33a0e8fe2be.tar.gz | |
* pa/linux-atomic.c (EBUSY): Define if not _LP64.
(__kernel_cmpxchg): Return -EBUSY if the kernel LWS call
succeeded and lws_ret is not equal to oldval.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@142141 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/config/pa/linux-atomic.c')
| -rw-r--r-- | gcc/config/pa/linux-atomic.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/config/pa/linux-atomic.c b/gcc/config/pa/linux-atomic.c index 4f9780feaa9..ca33ea6d9d6 100644 --- a/gcc/config/pa/linux-atomic.c +++ b/gcc/config/pa/linux-atomic.c @@ -33,8 +33,9 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA #ifndef _LP64 #include <errno.h> #else +#define EFAULT 14 +#define EBUSY 16 #define ENOSYS 251 -#define EFAULT 14 #endif /* All PA-RISC implementations supported by linux have strongly @@ -74,6 +75,13 @@ __kernel_cmpxchg (int oldval, int newval, int *mem) ); if (__builtin_expect (lws_errno == -EFAULT || lws_errno == -ENOSYS, 0)) ABORT_INSTRUCTION; + + /* If the kernel LWS call succeeded (lws_errno == 0), lws_ret contains + the old value from memory. If this value is equal to OLDVAL, the + new value was written to memory. If not, return -EBUSY. */ + if (!lws_errno && lws_ret != oldval) + lws_errno = -EBUSY; + return lws_errno; } |