| // |
| // |
| // 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 |