X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=libringbuffer%2Fgetcpu.h;h=dbc186c19afab85f2ddb764708a8d07bfb8cae1e;hb=6d940e0f88f76cd19717c3421929de05a7c8ac94;hp=44d0d5594f04641029bb70116d6784b8f8ef0ff0;hpb=fdb4af102796c056de5c1d7361a57bf9779788d1;p=lttng-ust.git

diff --git a/libringbuffer/getcpu.h b/libringbuffer/getcpu.h
index 44d0d559..dbc186c1 100644
--- a/libringbuffer/getcpu.h
+++ b/libringbuffer/getcpu.h
@@ -20,7 +20,6 @@
  */
 
 #include <urcu/compiler.h>
-#include <sched.h>
 
 #ifdef LTTNG_UST_DEBUG_VALGRIND
 
@@ -37,6 +36,33 @@ int lttng_ust_get_cpu(void)
 
 #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.
  */
@@ -50,6 +76,23 @@ int lttng_ust_get_cpu(void)
 		return 0;
 	return cpu;
 }
+#endif	/* __UCLIBC__ */
+
+#elif defined(__FreeBSD__)
+
+/*
+ * FreeBSD does 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