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-rw-r--r--src/common/cpucores.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/common/cpucores.h b/src/common/cpucores.h
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+++ b/src/common/cpucores.h
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+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file cpucores.h
+/// \brief Get the number of online CPU cores
+//
+// This code has been put into the public domain.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef CPUCORES_H
+#define CPUCORES_H
+
+#if defined(HAVE_NCPU_SYSCONF)
+# include <unistd.h>
+
+#elif defined(HAVE_NCPU_SYSCTL)
+# ifdef HAVE_SYS_PARAM_H
+# include <sys/param.h>
+# endif
+# ifdef HAVE_SYS_SYSCTL_H
+# include <sys/sysctl.h>
+# endif
+#endif
+
+
+static inline uint32_t
+cpucores(void)
+{
+ uint32_t ret = 0;
+
+#if defined(HAVE_CPUCORES_SYSCONF)
+ const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
+ if (cpus > 0)
+ ret = (uint32_t)(cpus);
+
+#elif defined(HAVE_CPUCORES_SYSCTL)
+ int name[2] = { CTL_HW, HW_NCPU };
+ int cpus;
+ size_t cpus_size = sizeof(cpus);
+ if (!sysctl(name, &cpus, &cpus_size, NULL, NULL)
+ && cpus_size == sizeof(cpus) && cpus > 0)
+ ret = (uint32_t)(cpus);
+#endif
+
+ return ret;
+}
+
+#endif