Initial checkin of gRPC to third_party/

third_party/grpc/src/core/support/cpu_linux.c

Index: third_party/grpc/src/core/support/cpu_linux.c
diff --git a/third_party/WebKit/Source/build/win/Precompile.h b/third_party/grpc/src/core/support/cpu_linux.c
similarity index 61%
copy from third_party/WebKit/Source/build/win/Precompile.h
copy to third_party/grpc/src/core/support/cpu_linux.c
index 8a0ff29c353fc1d30c92d27f369d7c422a579bc8..7af6a8f0090b4d14e670a6b8e5a63801381a9a6e 100644
--- a/third_party/WebKit/Source/build/win/Precompile.h
+++ b/third_party/grpc/src/core/support/cpu_linux.c
@@ -1,5 +1,7 @@
 /*
- * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * Copyright 2015, 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
@@ -26,43 +28,51 @@
  * 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.
- */
-
-/*
- * Precompiled header for WebKit when built on Windows using
- * GYP-generated project files.  Not used by other build
- * configurations.
  *
- * Using precompiled headers speeds the build up significantly.  On a
- * fast machine (HP Z600, 12 GB of RAM), an ~18% decrease in full
- * build time was measured.
  */
 
-#if defined(WinPrecompile_h_)
-#error You shouldn't include the precompiled header file more than once.
-#endif
-
-#define WinPrecompile_h_
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif /* _GNU_SOURCE */
 
-#define _USE_MATH_DEFINES // Make math.h behave like other platforms.
+#include <grpc/support/port_platform.h>
 
-#include <Windows.h>
+#ifdef GPR_CPU_LINUX
 
+#include <sched.h>
 #include <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <math.h>
-#include <stdarg.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
+#include <unistd.h>
 #include <string.h>
-#include <time.h>
 
-#include <algorithm>
-#include <ciso646>
-#include <cmath>
-#include <cstddef>
-#include <limits>
-#include <string>
-#include <utility>
+#include <grpc/support/cpu.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+
+static int ncpus = 0;
+
+static void init_num_cpus() {
+  /* This must be signed. sysconf returns -1 when the number cannot be
+     determined */
+  ncpus = (int)sysconf(_SC_NPROCESSORS_ONLN);
+  if (ncpus < 1) {
+    gpr_log(GPR_ERROR, "Cannot determine number of CPUs: assuming 1");
+    ncpus = 1;
+  }
+}
+
+unsigned gpr_cpu_num_cores(void) {
+  static gpr_once once = GPR_ONCE_INIT;
+  gpr_once_init(&once, init_num_cpus);
+  return (unsigned)ncpus;
+}
+
+unsigned gpr_cpu_current_cpu(void) {
+  int cpu = sched_getcpu();
+  if (cpu < 0) {
+    gpr_log(GPR_ERROR, "Error determining current CPU: %s\n", strerror(errno));
+    return 0;
+  }
+  return (unsigned)cpu;
+}
+
+#endif /* GPR_CPU_LINUX */