Go: removing request registry.

Passing unsafe.Pointers (void *) from Go to C is complicated by an attempt
to make such pointers less unsafe.

A straightforward optimization is to replace 'unsafe.Pointer' with 'uintptr'
(thanks to Xin Huang for the idea: https://stackoverflow.com/a/44826533 ).

As a result, request registry with mutex is gone.

1 files changed, 2 insertions, 4 deletions

diff --git a/src/go/unit/response.go b/src/go/unit/response.go
index 18daa2f3..258a82c9 100644
--- a/src/go/unit/response.go
+++ b/src/go/unit/response.go
@@ -13,7 +13,6 @@ import "C"
 import (
 	"fmt"
 	"net/http"
-	"os"
 )
 
 type response struct {
@@ -43,16 +42,15 @@ func (r *response) Write(p []byte) (n int, err error) {
 	}
 
 	l := C.size_t(len(p))
-	b := getCBytes(p)
+	b := buf_ref(p)
 	res := C.nxt_go_response_write(r.c_req, b, l)
-	C.free(b)
 	return int(res), nil
 }
 
 func (r *response) WriteHeader(code int) {
 	if r.headerSent {
 		// Note: explicitly using Stderr, as Stdout is our HTTP output.
-		fmt.Fprintf(os.Stderr, "CGI attempted to write header twice")
+		nxt_go_warn("multiple response.WriteHeader calls")
 		return
 	}
 	r.headerSent = true