Update to Libuv 1.44.0

Adds new function: `uv.available_parallelism`

Full changelog at https://github.com/libuv/libuv/blob/v1.x/ChangeLog

CMakeLists.txt

@@ -7,7 +7,7 @@ endif()
 project (luv C ASM)
 
 set(LUV_VERSION_MAJOR 1)
-set(LUV_VERSION_MINOR 43)
+set(LUV_VERSION_MINOR 44)
 set(LUV_VERSION_PATCH 0)
 set(LUV_VERSION ${LUV_VERSION_MAJOR}.${LUV_VERSION_MINOR}.${LUV_VERSION_PATCH})
 

docs.md

@@ -3316,6 +3316,18 @@ Returns the resource usage.
 - `nvcsw` : `integer` (voluntary context switches)
 - `nivcsw` : `integer` (involuntary context switches)
 
+### `uv.available_parallelism()`
+
+Returns an estimate of the default amount of parallelism a program should use. Always returns a non-zero value.
+
+On Linux, inspects the calling thread’s CPU affinity mask to determine if it has been pinned to specific CPUs.
+
+On Windows, the available parallelism may be underreported on systems with more than 64 logical CPUs.
+
+On other platforms, reports the number of CPUs that the operating system considers to be online.
+
+**Returns:** `integer`
+
 ### `uv.cpu_info()`
 
 Returns information about the CPU(s) on the system as a table of tables for each

src/luv.c

@@ -305,6 +305,9 @@ static const luaL_Reg luv_functions[] = {
   {"os_homedir", luv_os_homedir},
   {"os_tmpdir", luv_os_tmpdir},
   {"os_get_passwd", luv_os_get_passwd},
+#endif
+#if LUV_UV_VERSION_GEQ(1, 44, 0)
+  {"available_parallelism", luv_available_parallelism},
 #endif
   {"cpu_info", luv_cpu_info},
   {"cwd", luv_cwd},

src/misc.c

@@ -221,6 +221,13 @@ static int luv_getrusage(lua_State* L) {
   return 1;
 }
 
+#if LUV_UV_VERSION_GEQ(1, 44, 0)
+static int luv_available_parallelism(lua_State* L) {
+  lua_pushinteger(L, uv_available_parallelism());
+  return 1;
+}
+#endif
+
 static int luv_cpu_info(lua_State* L) {
   uv_cpu_info_t* cpu_infos = NULL;
   int count = 0, i;

tests/test-misc.lua

@@ -39,6 +39,11 @@ return require('lib/tap')(function (test)
     p(rusage)
   end)
 
+  test("uv.available_parallelism", function (print, p, expect, uv)
+    local available_parallelism = assert(uv.available_parallelism())
+    p(available_parallelism)
+  end, "1.44.0")
+
   test("uv.cpu_info", function (print, p, expect, uv)
     local info = assert(uv.cpu_info())
     p(info)