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//
//
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
#include <grpc/support/port_platform.h>
#include <grpc/support/cpu.h>
#ifdef GPR_CPU_IPHONE
#include <sys/sysctl.h>
unsigned gpr_cpu_num_cores(void) {
size_t len;
unsigned int ncpu;
len = sizeof(ncpu);
sysctlbyname("hw.ncpu", &ncpu, &len, NULL, 0);
return ncpu;
}
// 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
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