Provide a port of cpu related code to posix, and linux.

Properly set this up in our build environment.
	Change on 2014/12/23 by ctiller <ctiller@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=82725899

1 files changed, 75 insertions, 0 deletions

diff --git a/src/core/support/cpu_linux.c b/src/core/support/cpu_linux.c
new file mode 100644
index 0000000000..4d538a5b1b
--- /dev/null
+++ b/src/core/support/cpu_linux.c
@@ -0,0 +1,75 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_CPU_LINUX
+
+#include "src/core/support/cpu.h"
+
+#define _GNU_SOURCE
+#define __USE_GNU
+#define __USE_MISC
+#include <sched.h>
+#undef _GNU_SOURCE
+#undef __USE_GNU
+#undef __USE_MISC
+
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <grpc/support/log.h>
+
+int gpr_cpu_num_cores() {
+  static int ncpus = 0;
+  if (ncpus == 0) {
+    ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+    if (ncpus < 1) {
+      gpr_log(GPR_ERROR, "Cannot determine number of CPUs: assuming 1");
+      ncpus = 1;
+    }
+  }
+  return ncpus;
+}
+
+int gpr_cpu_current_cpu() {
+  int cpu = sched_getcpu();
+  if (cpu < 0) {
+    gpr_log(GPR_ERROR, "Error determining current CPU: %s\n", strerror(errno));
+    return 0;
+  }
+  return cpu;
+}
+
+#endif /* GPR_CPU_LINUX */