Initial checkin of gRPC to third_party/

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

Index: third_party/grpc/src/core/support/cpu_iphone.c
diff --git a/third_party/tcmalloc/chromium/src/base/linuxthreads.h b/third_party/grpc/src/core/support/cpu_iphone.c
similarity index 68%
copy from third_party/tcmalloc/chromium/src/base/linuxthreads.h
copy to third_party/grpc/src/core/support/cpu_iphone.c
index 5c318fed7ec4c47e7bf082e315992e102abcd620..82b49b47bc0a0c9dcc06b1be9c8d8aadc353eb44 100644
--- a/third_party/tcmalloc/chromium/src/base/linuxthreads.h
+++ b/third_party/grpc/src/core/support/cpu_iphone.c
@@ -1,4 +1,6 @@
-/* Copyright (c) 2005-2007, Google Inc.
+/*
+ *
+ * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -27,27 +29,21 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * ---
- * Author: Markus Gutschke
  */
 
-#ifndef _LINUXTHREADS_H
-#define _LINUXTHREADS_H
+#include <grpc/support/port_platform.h>
 
-/* Include thread_lister.h to get the interface that we implement for linux.
- */
+#ifdef GPR_CPU_IPHONE
 
-/* We currently only support x86-32 and x86-64 on Linux. Porting to other
- * related platforms should not be difficult.
- */
-#if (defined(__i386__) || defined(__x86_64__) || defined(__ARM_ARCH_3__) || \
-     defined(__mips__) || defined(__PPC__)) && defined(__linux)
-
-/* Define the THREADS symbol to make sure that there is exactly one core dumper
- * built into the library.
- */
-#define THREADS "Linux /proc"
+/* Probably 2 instead of 1, but see comment on gpr_cpu_current_cpu. */
+unsigned gpr_cpu_num_cores(void) { return 1; }
 
-#endif
+/* Most code that's using this is using it to shard across work queues. So
+   unless profiling shows it's a problem or there appears a way to detect the
+   currently running CPU core, let's have it shard the default way.
+   Note that the interface in cpu.h lets gpr_cpu_num_cores return 0, but doing
+   it makes it impossible for gpr_cpu_current_cpu to satisfy its stated range,
+   and some code might be relying on it. */
+unsigned gpr_cpu_current_cpu(void) { return 0; }
 
-#endif  /* _LINUXTHREADS_H */
+#endif /* GPR_CPU_IPHONE */