[njs] Improved accuracy of console.time()/console.timeEnd().

[Dmitry Volyntsev]

details: https://hg.nginx.org/njs/rev/b7706e03babc
branches:
changeset: 678:b7706e03babc
user: Artem S. Povalyukhin <***@gmail.com>
date: Wed Nov 28 21:56:19 2018 +0300
description:
Improved accuracy of console.time()/console.timeEnd().

diffstat:

njs/njs_shell.c | 23 ++++++++++-------------
1 files changed, 10 insertions(+), 13 deletions(-)

diffs (58 lines):

diff -r 2ad7533bcbae -r b7706e03babc njs/njs_shell.c
--- a/njs/njs_shell.c Wed Nov 28 21:50:28 2018 +0300
+++ b/njs/njs_shell.c Wed Nov 28 21:56:19 2018 +0300
@@ -153,7 +153,7 @@ static njs_external_t njs_externals[] =
static njs_completion_t njs_completion;


-static struct timeval njs_console_time;
+static uint64_t njs_console_time = UINT64_MAX;


int
@@ -781,7 +781,7 @@ njs_ext_console_time(njs_vm_t *vm, njs_v

vm->retval = njs_value_void;

- gettimeofday(&njs_console_time, NULL);
+ njs_console_time = nxt_time();

return NJS_OK;
}
@@ -791,28 +791,25 @@ static njs_ret_t
njs_ext_console_time_end(njs_vm_t *vm, njs_value_t *args, nxt_uint_t nargs,
njs_index_t unused)
{
- int64_t us, ms;
- struct timeval tv;
+ uint64_t ns, ms;

- gettimeofday(&tv, NULL);
+ ns = nxt_time();

if (!njs_value_is_void(njs_arg(args, nargs, 1))) {
njs_vm_error(vm, "labels not implemented");
return NJS_ERROR;
}

- if (nxt_fast_path(njs_console_time.tv_sec || njs_console_time.tv_usec)) {
+ if (nxt_fast_path(njs_console_time != UINT64_MAX)) {

- us = ((int64_t) tv.tv_sec - njs_console_time.tv_sec) * 1000000
- + ((int64_t) tv.tv_usec - njs_console_time.tv_usec);
+ ns = ns - njs_console_time;

- ms = us / 1000;
- us = us % 1000;
+ ms = ns / 1000000;
+ ns = ns % 1000000;

- printf("default: %" PRIu64 ".%03" PRIu64 "ms\n", ms, us);
+ printf("default: %" PRIu64 ".%06" PRIu64 "ms\n", ms, ns);

- njs_console_time.tv_sec = 0;
- njs_console_time.tv_usec = 0;
+ njs_console_time = UINT64_MAX;

} else {
printf("Timer \"default\" doesn’t exist.\n");