libuv: unix,win: add uv_spawn option to set child CPU affinity mask

Implement it on Linux, FreeBSD, and Windows for now, and fail with
UV_ENOTSUP on other platforms.

Backported from upstream libuv PR 1527, scheduled for inclusion
in libuv 2.0.

1 files changed, 13 insertions, 0 deletions

diff --git a/Utilities/cmlibuv/include/uv.h b/Utilities/cmlibuv/include/uv.h
index a2ba487..875e30a 100644
--- a/Utilities/cmlibuv/include/uv.h
+++ b/Utilities/cmlibuv/include/uv.h
@@ -925,6 +925,19 @@ typedef struct uv_process_options_s {
    */
   uv_uid_t uid;
   uv_gid_t gid;
+  /*
+    Libuv can set the child process' CPU affinity mask.  This happens when
+    `cpumask` is non-NULL.  It must point to an array of char values
+    of length `cpumask_size`, whose value must be at least that returned by
+    uv_cpumask_size().  Each byte in the mask can be either zero (false)
+    or non-zero (true) to indicate whether the corresponding processor at
+    that index is included.
+
+    If enabled on an unsupported platform, uv_spawn() will fail with
+    UV_ENOTSUP.
+   */
+  char* cpumask;
+  size_t cpumask_size;
 } uv_process_options_t;
 
 /*