src: add uv_thread_set/getname() methods (#4599)

`uv_thread_setname()` sets the name of the current thread. Different
platforms define different limits on the max number of characters
a thread name can be: Linux, IBMi (16), macOS (64), Windows (32767),
and NetBSD (32), etc. `uv_thread_setname()` will truncate it in case
`name` is larger than the limit of the platform.

`uv_thread_getname()` gets the name of the thread specified by `tid`.
The thread name is copied into the buffer pointed to by `name`. The
`size` parameter specifies the size of the buffer pointed to by `name`.
The buffer should be large enough to hold the name of the thread plus
the trailing NUL, or it will be truncated to fit.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/unix/internal.h b/src/unix/internal.h
index 698caf17..b1d2b217 100644
--- a/src/unix/internal.h
+++ b/src/unix/internal.h
@@ -327,6 +327,8 @@ void uv__prepare_close(uv_prepare_t* handle);
 void uv__process_close(uv_process_t* handle);
 void uv__stream_close(uv_stream_t* handle);
 void uv__tcp_close(uv_tcp_t* handle);
+int uv__thread_setname(const char* name);
+int uv__thread_getname(uv_thread_t* tid, char* name, size_t size);
 size_t uv__thread_stack_size(void);
 void uv__udp_close(uv_udp_t* handle);
 void uv__udp_finish_close(uv_udp_t* handle);