rt: Add rust_get_num_cpus

Author: brson

src/rt/rust_builtin.cpp

@@ -930,6 +930,13 @@ rust_begin_unwind(uintptr_t token) {
 #endif
 }
 
+extern int get_num_cpus();
+
+extern "C" CDECL uintptr_t
+rust_get_num_cpus() {
+    return get_num_cpus();
+}
+
 //
 // Local Variables:
 // mode: C++

src/rt/rust_env.cpp

@@ -40,15 +40,15 @@ rust_drop_env_lock() {
 }
 
 #if defined(__WIN32__)
-static int
+int
 get_num_cpus() {
     SYSTEM_INFO sysinfo;
     GetSystemInfo(&sysinfo);
 
     return (int) sysinfo.dwNumberOfProcessors;
 }
 #elif defined(__BSD__)
-static int
+int
 get_num_cpus() {
     /* swiped from http://stackoverflow.com/questions/150355/
        programmatically-find-the-number-of-cores-on-a-machine */
@@ -75,7 +75,7 @@ get_num_cpus() {
     return numCPU;
 }
 #elif defined(__GNUC__)
-static int
+int
 get_num_cpus() {
     return sysconf(_SC_NPROCESSORS_ONLN);
 }

src/rt/rustrt.def.in

@@ -239,3 +239,4 @@ rust_valgrind_stack_deregister
 rust_take_env_lock
 rust_drop_env_lock
 rust_update_log_settings
+rust_get_num_cpus