Creates cpu_iphone.c

So that cpu_posix.c can be left untouched for the other platforms.
pull/1074/head
Jorge Canizales 10 years ago
parent ecf53c6b1b
commit 30e666cae7
  1. 2
      include/grpc/support/cpu.h
  2. 4
      include/grpc/support/port_platform.h
  3. 53
      src/core/support/cpu_iphone.c
  4. 16
      src/core/support/cpu_posix.c

@ -41,7 +41,7 @@ extern "C" {
/* Interface providing CPU information for currently running system */
/* Return the number of CPU cores on the current system. Will return 0 if
if information is not available. */
the information is not available. */
unsigned gpr_cpu_num_cores(void);
/* Return the CPU on which the current thread is executing; N.B. This should

@ -117,7 +117,11 @@
#ifndef _BSD_SOURCE
#define _BSD_SOURCE
#endif
#ifdef TARGET_OS_IPHONE
#define GPR_CPU_IPHONE 1
#else /* TARGET_OS_IPHONE */
#define GPR_CPU_POSIX 1
#endif
#define GPR_GCC_ATOMIC 1
#define GPR_POSIX_LOG 1
#define GPR_POSIX_MULTIPOLL_WITH_POLL 1

@ -0,0 +1,53 @@
/*
*
* 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
* 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_IPHONE
/* Probably 2 instead of 1, but see comment on gpr_cpu_current_cpu. */
unsigned gpr_cpu_num_cores(void) {
return 1;
}
/* 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 /* GPR_CPU_IPHONE */

@ -42,6 +42,8 @@
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
static __thread char magic_thread_local;
static int ncpus = 0;
static void init_ncpus() {
@ -58,10 +60,18 @@ unsigned gpr_cpu_num_cores(void) {
return ncpus;
}
/* This is a cheap, but good enough, pointer hash for sharding things: */
static size_t shard_ptr(const void *info) {
size_t x = (size_t)info;
return ((x >> 4) ^ (x >> 9) ^ (x >> 14)) % gpr_cpu_num_cores();
}
unsigned gpr_cpu_current_cpu(void) {
/* NOTE: there's no way I know to return the actual cpu index portably...
most code that's using this is using it to shard across work queues though */
return 0;
most code that's using this is using it to shard across work queues though,
so here we use thread identity instead to achieve a similar though not
identical effect */
return shard_ptr(&magic_thread_local);
}
#endif /* GPR_CPU_LINUX */
#endif /* GPR_CPU_POSIX */

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