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#include <string.h>
#include <alloca.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <cpuinfo/log.h>
#include <mach/api.h>
struct cpuinfo_mach_topology cpuinfo_mach_detect_topology(void) {
int cores = 1;
size_t sizeof_cores = sizeof(cores);
if (sysctlbyname("hw.physicalcpu_max", &cores, &sizeof_cores, NULL, 0) != 0) {
cpuinfo_log_error("sysctlbyname(\"hw.physicalcpu_max\") failed: %s", strerror(errno));
} else if (cores <= 0) {
cpuinfo_log_error("sysctlbyname(\"hw.physicalcpu_max\") returned invalid value %d", cores);
cores = 1;
}
int threads = 1;
size_t sizeof_threads = sizeof(threads);
if (sysctlbyname("hw.logicalcpu_max", &threads, &sizeof_threads, NULL, 0) != 0) {
cpuinfo_log_error("sysctlbyname(\"hw.logicalcpu_max\") failed: %s", strerror(errno));
} else if (threads <= 0) {
cpuinfo_log_error("sysctlbyname(\"hw.logicalcpu_max\") returned invalid value %d", threads);
threads = cores;
}
int packages = 1;
size_t sizeof_packages = sizeof(packages);
if (sysctlbyname("hw.packages", &packages, &sizeof_packages, NULL, 0) != 0) {
cpuinfo_log_error("sysctlbyname(\"hw.packages\") failed: %s", strerror(errno));
} else if (packages <= 0) {
cpuinfo_log_error("sysctlbyname(\"hw.packages\") returned invalid value %d", packages);
packages = 1;
}
cpuinfo_log_debug("mach topology: packages = %d, cores = %d, threads = %d", packages, (int) cores, (int) threads);
struct cpuinfo_mach_topology topology = {
.packages = (uint32_t) packages,
.cores = (uint32_t) cores,
.threads = (uint32_t) threads
};
size_t cacheconfig_size = 0;
if (sysctlbyname("hw.cacheconfig", NULL, &cacheconfig_size, NULL, 0) != 0) {
cpuinfo_log_error("sysctlbyname(\"hw.cacheconfig\") failed: %s", strerror(errno));
} else {
uint64_t* cacheconfig = alloca(cacheconfig_size);
if (sysctlbyname("hw.cacheconfig", cacheconfig, &cacheconfig_size, NULL, 0) != 0) {
cpuinfo_log_error("sysctlbyname(\"hw.cacheconfig\") failed: %s", strerror(errno));
} else {
size_t cache_configs = cacheconfig_size / sizeof(uint64_t);
cpuinfo_log_debug("mach hw.cacheconfig count: %zu", cache_configs);
if (cache_configs > CPUINFO_MACH_MAX_CACHE_LEVELS) {
cache_configs = CPUINFO_MACH_MAX_CACHE_LEVELS;
}
for (size_t i = 0; i < cache_configs; i++) {
cpuinfo_log_debug("mach hw.cacheconfig[%zu]: %"PRIu64, i, cacheconfig[i]);
topology.threads_per_cache[i] = cacheconfig[i];
}
}
}
return topology;
}
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