Fix: dynamic fallback to compat futex on sys_futex ENOSYS

[urcu.git] / urcu / futex.h

diff --git a/urcu/futex.h b/urcu/futex.h
index 2be3bb6c1dc96e5ee71d932f9a2ae7f5221d901b..13d2b1a0a9c73904563e2b9b46d40d19e3316686 100644 (file)
--- a/urcu/futex.h
+++ b/urcu/futex.h
@@ -47,22 +47,66 @@ extern "C" {
  * (returns EINTR).
  */
 
+extern int compat_futex_noasync(int32_t *uaddr, int op, int32_t val,
+               const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
+extern int compat_futex_async(int32_t *uaddr, int op, int32_t val,
+               const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
+
 #ifdef CONFIG_RCU_HAVE_FUTEX
+
+#include <unistd.h>
+#include <errno.h>
+#include <urcu/compiler.h>
 #include <urcu/syscall-compat.h>
-#define futex(...)     syscall(__NR_futex, __VA_ARGS__)
-#define futex_noasync(uaddr, op, val, timeout, uaddr2, val3)   \
-               futex(uaddr, op, val, timeout, uaddr2, val3)
-#define futex_async(uaddr, op, val, timeout, uaddr2, val3)     \
-               futex(uaddr, op, val, timeout, uaddr2, val3)
+
+static inline int futex(int32_t *uaddr, int op, int32_t val,
+               const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
+{
+       return syscall(__NR_futex, uaddr, op, val, timeout,
+                       uaddr2, val3);
+}
+
+static inline int futex_noasync(int32_t *uaddr, int op, int32_t val,
+               const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
+{
+       int ret;
+
+       ret = futex(uaddr, op, val, timeout, uaddr2, val3);
+       if (caa_unlikely(ret < 0 && errno == ENOSYS)) {
+               return compat_futex_noasync(uaddr, op, val, timeout,
+                               uaddr2, val3);
+       }
+       return ret;
+
+}
+
+static inline int futex_async(int32_t *uaddr, int op, int32_t val,
+               const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
+{
+       int ret;
+
+       ret = futex(uaddr, op, val, timeout, uaddr2, val3);
+       if (caa_unlikely(ret < 0 && errno == ENOSYS)) {
+               return compat_futex_async(uaddr, op, val, timeout,
+                               uaddr2, val3);
+       }
+       return ret;
+}
+
 #else
-extern int compat_futex_noasync(int32_t *uaddr, int op, int32_t val,
-       const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
-#define futex_noasync(uaddr, op, val, timeout, uaddr2, val3)   \
-               compat_futex_noasync(uaddr, op, val, timeout, uaddr2, val3)
-extern int compat_futex_async(int32_t *uaddr, int op, int32_t val,
-       const struct timespec *timeout, int32_t *uaddr2, int32_t val3);
-#define futex_async(uaddr, op, val, timeout, uaddr2, val3)     \
-               compat_futex_async(uaddr, op, val, timeout, uaddr2, val3)
+
+static inline int futex_noasync(int32_t *uaddr, int op, int32_t val,
+               const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
+{
+       return compat_futex_noasync(uaddr, op, val, timeout, uaddr2, val3);
+}
+
+static inline int futex_async(int32_t *uaddr, int op, int32_t val,
+               const struct timespec *timeout, int32_t *uaddr2, int32_t val3)
+{
+       return compat_futex_async(uaddr, op, val, timeout, uaddr2, val3);
+}
+
 #endif
 
 #ifdef __cplusplus