v0.1.0

.gitignore

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+target
+Cargo.lock

Cargo.toml

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+[package]
+
+name = "num_cpus"
+version = "0.1.0"
+authors = ["Sean McArthur <sean.monstar@gmail.com>"]
+license = "MIT"
+repository = "https://github.com/seanmonstar/num_cpus"
+build = "build.rs"
+
+
+[dependencies]
+libc = "*"
+
+[build-dependencies]
+gcc = "*"

LICENSE

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+Copyright (c) 2015
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+

README.md

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+# num_cpus
+
+A replacement for the deprecated `std::os::num_cpus`.
+
+## Usage
+
+Add to Cargo.toml:
+
+```
+[dependencies]
+num_cpus = "*"
+```
+
+In your `main.rs` or `lib.rs`:
+
+```rust
+extern crate num_cpus;
+
+// elsewhere
+let num = num_cpus::get();
+```
+
+## License
+
+MIT

build.rs

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+#![deny(warnings)]
+
+extern crate gcc;
+
+fn main() {
+    gcc::compile_library(
+        "libnumcpus.a",
+        &["extern/num_cpus.c"]
+    );
+}

extern/num_cpus.c

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+#if !defined(__WIN32__)
+#include <unistd.h>
+#else
+#include <windows.h>
+#endif
+
+
+static int
+num_cpus() {
+#if defined(__WIN32__)
+    SYSTEM_INFO sysinfo;
+    GetSystemInfo(&sysinfo);
+
+    return (int) sysinfo.dwNumberOfProcessors;
+#elif defined(__BSD__)
+    /* swiped from http://stackoverflow.com/questions/150355/
+     *        programmatically-find-the-number-of-cores-on-a-machine */
+
+    unsigned int numCPU;
+    int mib[4];
+    size_t len = sizeof(numCPU);
+
+    /* set the mib for hw.ncpu */
+    mib[0] = CTL_HW;
+    mib[1] = HW_AVAILCPU;  // alternatively, try HW_NCPU;
+
+    /* get the number of CPUs from the system */
+    sysctl(mib, 2, &numCPU, &len, NULL, 0);
+
+    if( numCPU < 1 ) {
+            mib[1] = HW_NCPU;
+            sysctl( mib, 2, &numCPU, &len, NULL, 0 );
+    
+            if( numCPU < 1 ) {
+                        numCPU = 1;
+                    }
+                }
+        return numCPU;
+#elif defined(__GNUC__)
+    return sysconf(_SC_NPROCESSORS_ONLN);
+#endif
+}
+
+int
+crates_io_get_num_cpus() {
+    return num_cpus();
+}

src/lib.rs

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+//! Replaces the deprecated functionality of std::os::num_cpus.
+
+#![cfg_attr(test, deny(warnings))]
+#![deny(missing_docs)]
+
+extern crate libc;
+
+/// Returns the number of CPUs of the current machine.
+pub fn get() -> usize {
+    unsafe {
+        crates_io_get_num_cpus() as usize
+    }
+}
+
+extern {
+    fn crates_io_get_num_cpus() -> libc::c_int;
+}
+
+#[test]
+fn it_works() {
+    assert!(get() > 0);
+}