From 9c9a3784556d519c6aba3b1c899e86e73aacfaeb Mon Sep 17 00:00:00 2001
From: Shannon Booth <shannon@serenityos.org>
Date: Fri, 5 Apr 2024 20:43:45 +0200
Subject: [PATCH] LibCore: Implement Core::System::hardware_concurrency()

---
 Userland/Libraries/LibCore/System.cpp | 5 +++++
 Userland/Libraries/LibCore/System.h   | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/Userland/Libraries/LibCore/System.cpp b/Userland/Libraries/LibCore/System.cpp
index 820ccb9b1f8..aa6eb7d999e 100644
--- a/Userland/Libraries/LibCore/System.cpp
+++ b/Userland/Libraries/LibCore/System.cpp
@@ -1739,6 +1739,11 @@ ErrorOr<void> posix_fallocate(int fd, off_t offset, off_t length)
 // the distinction between these libraries moot.
 static constexpr StringView INTERNAL_DEFAULT_PATH_SV = "/usr/local/sbin:/usr/local/bin:/usr/bin:/bin"sv;
 
+unsigned hardware_concurrency()
+{
+    return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
 ErrorOr<String> resolve_executable_from_environment(StringView filename, int flags)
 {
     if (filename.is_empty())
diff --git a/Userland/Libraries/LibCore/System.h b/Userland/Libraries/LibCore/System.h
index f37f699f67a..a57d1f8faf0 100644
--- a/Userland/Libraries/LibCore/System.h
+++ b/Userland/Libraries/LibCore/System.h
@@ -276,6 +276,8 @@ ErrorOr<AddressInfoVector> getaddrinfo(char const* nodename, char const* servnam
 ErrorOr<void> posix_fallocate(int fd, off_t offset, off_t length);
 #endif
 
+unsigned hardware_concurrency();
+
 ErrorOr<String> resolve_executable_from_environment(StringView filename, int flags = 0);
 
 ErrorOr<ByteString> current_executable_path();