* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#define _GNU_SOURCE
#include <urcu/compiler.h>
-#include <sched.h>
-#ifdef UST_VALGRIND
+#ifdef LTTNG_UST_DEBUG_VALGRIND
/*
* Fallback on cpu 0 if liblttng-ust is build with Valgrind support.
#else
+/*
+ * sched_getcpu.
+ */
+#ifdef __linux__
+
+/* old uClibc versions didn't have sched_getcpu */
+#if defined(__UCLIBC__) && __UCLIBC_MAJOR__ == 0 && \
+ (__UCLIBC_MINOR__ < 9 || \
+ (__UCLIBC_MINOR__ == 9 && __UCLIBC_SUBLEVEL__ <= 32))
+#include <sys/syscall.h>
+#define __getcpu(cpu, node, cache) syscall(__NR_getcpu, cpu, node, cache)
+/*
+ * If getcpu is not implemented in the kernel, use cpu 0 as fallback.
+ */
+static inline
+int lttng_ust_get_cpu(void)
+{
+ int cpu, ret;
+
+ ret = __getcpu(&cpu, NULL, NULL);
+ if (caa_unlikely(ret < 0))
+ return 0;
+ return c;
+}
+#else /* __UCLIBC__ */
+#include <sched.h>
+
/*
* If getcpu is not implemented in the kernel, use cpu 0 as fallback.
*/
return 0;
return cpu;
}
+#endif /* __UCLIBC__ */
+
+#elif (defined(__FreeBSD__) || defined(__CYGWIN__))
+
+/*
+ * FreeBSD and Cygwin do not allow query of CPU ID. Always use CPU
+ * number 0, with the assocated performance degradation on SMP.
+ */
+static inline
+int lttng_ust_get_cpu(void)
+{
+ return 0;
+}
+
+#else
+#error "Please add support for your OS into liblttng-ust/compat.h."
+#endif
#endif