Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Abhishek Kanike]

​Yes gin has its own implementation of time apart from default-platform.
I have one more concern.
How can i implement my own javascript API?
Basically I am thinking to create two javascript API which calls two
respective calls from my shared library (external)​.
Instead of creating two new api's is there any other method from JavaScript
which calls my external library functions. I dont want to fork processes
from javascript to execute my library functions since I am planning to
profile chrome browser.

Regards,
K Abhishek

On Thu, Jun 21, 2018 at 1:34 PM Jakob Kummerow 
wrote:

> gin provides its own v8::Platform implementation, overriding the default
> platform.
>
> On Thu, Jun 21, 2018 at 9:55 AM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> Hi Jakob and v8-users,​​
>> I have following observations on printing logs in v8 and date.now call
>> trace.
>>
>>1. *Logs in v8:*
>>
>>*printf* and *std::cout* were not outputting any logs in adb logcat.
>>I ​tried redirecting stdio logs to logcat by following commands -
>>
>>$ adb shell stop$ adb shell setprop log.redirect-stdio true$ adb shell 
>> start
>>
>>But still logs were not getting displayed in adb logcat. So I used
>>android log library. Following is the procedure
>>
>>- Import header file:
>>
>>   #if defined(V8_OS_ANDROID)
>> #include 
>>   #endif
>>
>>   - Print log:
>>
>>   #if defined(V8_OS_ANDROID)
>> __android_log_print(ANDROID_LOG_INFO, "", "");
>>   #endif
>>
>>
>>2. Date.now() final system call:
>>Date.now() calls *V8Platform::CurrentClockTimeMillis()* from*
>>src/gin/v8_platform.cc *---> *Time::Now() *from
>>*src/base/time/time.cc* ---> *getTimeofDay() *rather than 
>> *base::OS::TimeCurrentMillis.
>>*Can anyone explain this behaviour?
>>
>> Regards,
>> K Abhishek
>>
>>
>>
>> On Mon, Jun 18, 2018 at 7:07 PM Jakob Kummerow 
>> wrote:
>>
>>> Sure, just use printf or std::cout << "print\n". I don't know whether
>>> adb logcat has any special requirements.
>>>
>>> On Mon, Jun 18, 2018 at 3:48 PM Abhishek Kanike <
>>> kai.dranzer32...@gmail.com> wrote:
>>>
 Jakob,
 Thanks for quick reply.
 That's a good point, should have tried with gdb. Will check with that.
 Is there a way to add logs in v8 source code, it will be lot faster to
 debug.
 In cc (compositor), i used *LOG(INFO)<<"print";* from *base/logging.h *(of
 main chromium *src*)

 On Mon, Jun 18, 2018 at 5:12 PM Jakob Kummerow 
 wrote:

> Yes, it is.
>
> Have you tried using a debugger? You can set a breakpoint in
> the BUILTIN(DateNow) function here:
>
>
> https://cs.chromium.org/chromium/src/v8/src/builtins/builtins-date.cc?q=builtins-date.cc=package:chromium=282
>
> and step through the code from there.
>
> On Mon, Jun 18, 2018 at 2:39 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> ​Hi,
>> For confirmation i am using a simple Date.now() call on button click
>> [Attached].
>> I have added a print log in Time::NOW() at
>> https://cs.chromium.org/chromium/src/v8/src/base/platform/time.cc?type=cs=package:chromium=0=402
>> as printf("v8:DEBUG::TIME:NOW called").
>> I am not getting this log in adb logcat. So is this the correct place
>> from where Date.now() is getting called?
>>
>> Regards,
>> K Abhishek
>>
>> On Mon, May 21, 2018 at 6:51 PM Abhishek Kanike <
>> kai.dranzer32...@gmail.com> wrote:
>>
>>> Sorry JaKob
>>>
>>> On Mon, May 21, 2018, 6:51 PM Abhishek Kanike <
>>> kai.dranzer32...@gmail.com> wrote:
>>>
 Cool.. I see it. Thanks a lot Jacob.

 On Mon, May 21, 2018, 5:40 PM Jakob Kummerow <
 jkumme...@chromium.org> wrote:

> The time always has to be retrieved from the kernel. V8's
> implementation is in base::OS::TimeCurrentMillis, implemented in
> src/base/platform/platform-{win32,posix}.cc.
>
> On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> Hi,
>> I want to know how the date.now() function is called in
>> javascript (or how it returns the value). I believe that javascript 
>> uses
>> date.now() by system call. I want to in chrome source code how it is 
>> being
>> set.
>> This is useful for one of the performance benchmark that I am
>> working on.
>> Can someone please guide me to know how this happens in v8 engine.
>>
>> Thanks in advance.
>>
>> Regards,
>> K Abhishek
>>
>> --
>> --
>> v8-users mailing list
>> v8-users@googlegroups.com
>> http://groups.google.com/group/v8-users
>> ---
>> You received this message because you are subscribed to the
>> Google Groups 

Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Jakob Kummerow]

gin provides its own v8::Platform implementation, overriding the default
platform.

On Thu, Jun 21, 2018 at 9:55 AM Abhishek Kanike 
wrote:

> Hi Jakob and v8-users,​​
> I have following observations on printing logs in v8 and date.now call
> trace.
>
>1. *Logs in v8:*
>
>*printf* and *std::cout* were not outputting any logs in adb logcat. I
>​tried redirecting stdio logs to logcat by following commands -
>
>$ adb shell stop$ adb shell setprop log.redirect-stdio true$ adb shell 
> start
>
>But still logs were not getting displayed in adb logcat. So I used
>android log library. Following is the procedure
>
>- Import header file:
>
>   #if defined(V8_OS_ANDROID)
> #include 
>   #endif
>
>   - Print log:
>
>   #if defined(V8_OS_ANDROID)
> __android_log_print(ANDROID_LOG_INFO, "", "");
>   #endif
>
>
>2. Date.now() final system call:
>Date.now() calls *V8Platform::CurrentClockTimeMillis()* from*
>src/gin/v8_platform.cc *---> *Time::Now() *from *src/base/time/time.cc*
>---> *getTimeofDay() *rather than *base::OS::TimeCurrentMillis. *Can
>anyone explain this behaviour?
>
> Regards,
> K Abhishek
>
>
>
> On Mon, Jun 18, 2018 at 7:07 PM Jakob Kummerow 
> wrote:
>
>> Sure, just use printf or std::cout << "print\n". I don't know whether
>> adb logcat has any special requirements.
>>
>> On Mon, Jun 18, 2018 at 3:48 PM Abhishek Kanike <
>> kai.dranzer32...@gmail.com> wrote:
>>
>>> Jakob,
>>> Thanks for quick reply.
>>> That's a good point, should have tried with gdb. Will check with that.
>>> Is there a way to add logs in v8 source code, it will be lot faster to
>>> debug.
>>> In cc (compositor), i used *LOG(INFO)<<"print";* from *base/logging.h *(of
>>> main chromium *src*)
>>>
>>> On Mon, Jun 18, 2018 at 5:12 PM Jakob Kummerow 
>>> wrote:
>>>
 Yes, it is.

 Have you tried using a debugger? You can set a breakpoint in
 the BUILTIN(DateNow) function here:


 https://cs.chromium.org/chromium/src/v8/src/builtins/builtins-date.cc?q=builtins-date.cc=package:chromium=282

 and step through the code from there.

 On Mon, Jun 18, 2018 at 2:39 PM Abhishek Kanike <
 kai.dranzer32...@gmail.com> wrote:

> ​Hi,
> For confirmation i am using a simple Date.now() call on button click
> [Attached].
> I have added a print log in Time::NOW() at
> https://cs.chromium.org/chromium/src/v8/src/base/platform/time.cc?type=cs=package:chromium=0=402
> as printf("v8:DEBUG::TIME:NOW called").
> I am not getting this log in adb logcat. So is this the correct place
> from where Date.now() is getting called?
>
> Regards,
> K Abhishek
>
> On Mon, May 21, 2018 at 6:51 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> Sorry JaKob
>>
>> On Mon, May 21, 2018, 6:51 PM Abhishek Kanike <
>> kai.dranzer32...@gmail.com> wrote:
>>
>>> Cool.. I see it. Thanks a lot Jacob.
>>>
>>> On Mon, May 21, 2018, 5:40 PM Jakob Kummerow 
>>> wrote:
>>>
 The time always has to be retrieved from the kernel. V8's
 implementation is in base::OS::TimeCurrentMillis, implemented in
 src/base/platform/platform-{win32,posix}.cc.

 On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike <
 kai.dranzer32...@gmail.com> wrote:

> Hi,
> I want to know how the date.now() function is called in javascript
> (or how it returns the value). I believe that javascript uses 
> date.now() by
> system call. I want to in chrome source code how it is being set.
> This is useful for one of the performance benchmark that I am
> working on.
> Can someone please guide me to know how this happens in v8 engine.
>
> Thanks in advance.
>
> Regards,
> K Abhishek
>
> --
> --
> v8-users mailing list
> v8-users@googlegroups.com
> http://groups.google.com/group/v8-users
> ---
> You received this message because you are subscribed to the Google
> Groups "v8-users" group.
> To unsubscribe from this group and stop receiving emails from it,
> send an email to v8-users+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
 --
 --
 v8-users mailing list
 v8-users@googlegroups.com
 http://groups.google.com/group/v8-users
 ---
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 Groups "v8-users" group.
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>>>
>
> --
> Cheers,
> K Abhishek
>
> --
> --
> 

Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Abhishek Kanike]

Hi Jakob and v8-users,​​
I have following observations on printing logs in v8 and date.now call
trace.

   1. *Logs in v8:*

   *printf* and *std::cout* were not outputting any logs in adb logcat. I
   ​tried redirecting stdio logs to logcat by following commands -

   $ adb shell stop$ adb shell setprop log.redirect-stdio true$ adb shell start

   But still logs were not getting displayed in adb logcat. So I used
   android log library. Following is the procedure

   - Import header file:

  #if defined(V8_OS_ANDROID)
#include 
  #endif

  - Print log:

  #if defined(V8_OS_ANDROID)
__android_log_print(ANDROID_LOG_INFO, "", "");
  #endif


   2. Date.now() final system call:
   Date.now() calls *V8Platform::CurrentClockTimeMillis()* from*
   src/gin/v8_platform.cc *---> *Time::Now() *from *src/base/time/time.cc*
   ---> *getTimeofDay() *rather than *base::OS::TimeCurrentMillis. *Can
   anyone explain this behaviour?

Regards,
K Abhishek



On Mon, Jun 18, 2018 at 7:07 PM Jakob Kummerow 
wrote:

> Sure, just use printf or std::cout << "print\n". I don't know whether adb
> logcat has any special requirements.
>
> On Mon, Jun 18, 2018 at 3:48 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> Jakob,
>> Thanks for quick reply.
>> That's a good point, should have tried with gdb. Will check with that.
>> Is there a way to add logs in v8 source code, it will be lot faster to
>> debug.
>> In cc (compositor), i used *LOG(INFO)<<"print";* from *base/logging.h *(of
>> main chromium *src*)
>>
>> On Mon, Jun 18, 2018 at 5:12 PM Jakob Kummerow 
>> wrote:
>>
>>> Yes, it is.
>>>
>>> Have you tried using a debugger? You can set a breakpoint in
>>> the BUILTIN(DateNow) function here:
>>>
>>>
>>> https://cs.chromium.org/chromium/src/v8/src/builtins/builtins-date.cc?q=builtins-date.cc=package:chromium=282
>>>
>>> and step through the code from there.
>>>
>>> On Mon, Jun 18, 2018 at 2:39 PM Abhishek Kanike <
>>> kai.dranzer32...@gmail.com> wrote:
>>>
 ​Hi,
 For confirmation i am using a simple Date.now() call on button click
 [Attached].
 I have added a print log in Time::NOW() at
 https://cs.chromium.org/chromium/src/v8/src/base/platform/time.cc?type=cs=package:chromium=0=402
 as printf("v8:DEBUG::TIME:NOW called").
 I am not getting this log in adb logcat. So is this the correct place
 from where Date.now() is getting called?

 Regards,
 K Abhishek

 On Mon, May 21, 2018 at 6:51 PM Abhishek Kanike <
 kai.dranzer32...@gmail.com> wrote:

> Sorry JaKob
>
> On Mon, May 21, 2018, 6:51 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> Cool.. I see it. Thanks a lot Jacob.
>>
>> On Mon, May 21, 2018, 5:40 PM Jakob Kummerow 
>> wrote:
>>
>>> The time always has to be retrieved from the kernel. V8's
>>> implementation is in base::OS::TimeCurrentMillis, implemented in
>>> src/base/platform/platform-{win32,posix}.cc.
>>>
>>> On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike <
>>> kai.dranzer32...@gmail.com> wrote:
>>>
 Hi,
 I want to know how the date.now() function is called in javascript
 (or how it returns the value). I believe that javascript uses 
 date.now() by
 system call. I want to in chrome source code how it is being set.
 This is useful for one of the performance benchmark that I am
 working on.
 Can someone please guide me to know how this happens in v8 engine.

 Thanks in advance.

 Regards,
 K Abhishek

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>>> --
>>> --
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>>> v8-users@googlegroups.com
>>> http://groups.google.com/group/v8-users
>>> ---
>>> You received this message because you are subscribed to the Google
>>> Groups "v8-users" group.
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>>> send an email to v8-users+unsubscr...@googlegroups.com.
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>>>
>>

 --
 Cheers,
 K Abhishek

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Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Jakob Kummerow]

Sure, just use printf or std::cout << "print\n". I don't know whether adb
logcat has any special requirements.

On Mon, Jun 18, 2018 at 3:48 PM Abhishek Kanike 
wrote:

> Jakob,
> Thanks for quick reply.
> That's a good point, should have tried with gdb. Will check with that.
> Is there a way to add logs in v8 source code, it will be lot faster to
> debug.
> In cc (compositor), i used *LOG(INFO)<<"print";* from *base/logging.h *(of
> main chromium *src*)
>
> On Mon, Jun 18, 2018 at 5:12 PM Jakob Kummerow 
> wrote:
>
>> Yes, it is.
>>
>> Have you tried using a debugger? You can set a breakpoint in
>> the BUILTIN(DateNow) function here:
>>
>>
>> https://cs.chromium.org/chromium/src/v8/src/builtins/builtins-date.cc?q=builtins-date.cc=package:chromium=282
>>
>> and step through the code from there.
>>
>> On Mon, Jun 18, 2018 at 2:39 PM Abhishek Kanike <
>> kai.dranzer32...@gmail.com> wrote:
>>
>>> ​Hi,
>>> For confirmation i am using a simple Date.now() call on button click
>>> [Attached].
>>> I have added a print log in Time::NOW() at
>>> https://cs.chromium.org/chromium/src/v8/src/base/platform/time.cc?type=cs=package:chromium=0=402
>>> as printf("v8:DEBUG::TIME:NOW called").
>>> I am not getting this log in adb logcat. So is this the correct place
>>> from where Date.now() is getting called?
>>>
>>> Regards,
>>> K Abhishek
>>>
>>> On Mon, May 21, 2018 at 6:51 PM Abhishek Kanike <
>>> kai.dranzer32...@gmail.com> wrote:
>>>
 Sorry JaKob

 On Mon, May 21, 2018, 6:51 PM Abhishek Kanike <
 kai.dranzer32...@gmail.com> wrote:

> Cool.. I see it. Thanks a lot Jacob.
>
> On Mon, May 21, 2018, 5:40 PM Jakob Kummerow 
> wrote:
>
>> The time always has to be retrieved from the kernel. V8's
>> implementation is in base::OS::TimeCurrentMillis, implemented in
>> src/base/platform/platform-{win32,posix}.cc.
>>
>> On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike <
>> kai.dranzer32...@gmail.com> wrote:
>>
>>> Hi,
>>> I want to know how the date.now() function is called in javascript
>>> (or how it returns the value). I believe that javascript uses 
>>> date.now() by
>>> system call. I want to in chrome source code how it is being set.
>>> This is useful for one of the performance benchmark that I am
>>> working on.
>>> Can someone please guide me to know how this happens in v8 engine.
>>>
>>> Thanks in advance.
>>>
>>> Regards,
>>> K Abhishek
>>>
>>> --
>>> --
>>> v8-users mailing list
>>> v8-users@googlegroups.com
>>> http://groups.google.com/group/v8-users
>>> ---
>>> You received this message because you are subscribed to the Google
>>> Groups "v8-users" group.
>>> To unsubscribe from this group and stop receiving emails from it,
>>> send an email to v8-users+unsubscr...@googlegroups.com.
>>> For more options, visit https://groups.google.com/d/optout.
>>>
>> --
>> --
>> v8-users mailing list
>> v8-users@googlegroups.com
>> http://groups.google.com/group/v8-users
>> ---
>> You received this message because you are subscribed to the Google
>> Groups "v8-users" group.
>> To unsubscribe from this group and stop receiving emails from it,
>> send an email to v8-users+unsubscr...@googlegroups.com.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>>>
>>> --
>>> Cheers,
>>> K Abhishek
>>>
>>> --
>>> --
>>> v8-users mailing list
>>> v8-users@googlegroups.com
>>> http://groups.google.com/group/v8-users
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>>>
>> --
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>>
>
>
> --
> Cheers,
> K Abhishek
>
> --
> --
> v8-users mailing list
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Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Abhishek Kanike]

Jakob,
Thanks for quick reply.
That's a good point, should have tried with gdb. Will check with that.
Is there a way to add logs in v8 source code, it will be lot faster to
debug.
In cc (compositor), i used *LOG(INFO)<<"print";* from *base/logging.h *(of
main chromium *src*)

On Mon, Jun 18, 2018 at 5:12 PM Jakob Kummerow 
wrote:

> Yes, it is.
>
> Have you tried using a debugger? You can set a breakpoint in
> the BUILTIN(DateNow) function here:
>
>
> https://cs.chromium.org/chromium/src/v8/src/builtins/builtins-date.cc?q=builtins-date.cc=package:chromium=282
>
> and step through the code from there.
>
> On Mon, Jun 18, 2018 at 2:39 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> ​Hi,
>> For confirmation i am using a simple Date.now() call on button click
>> [Attached].
>> I have added a print log in Time::NOW() at
>> https://cs.chromium.org/chromium/src/v8/src/base/platform/time.cc?type=cs=package:chromium=0=402
>> as printf("v8:DEBUG::TIME:NOW called").
>> I am not getting this log in adb logcat. So is this the correct place
>> from where Date.now() is getting called?
>>
>> Regards,
>> K Abhishek
>>
>> On Mon, May 21, 2018 at 6:51 PM Abhishek Kanike <
>> kai.dranzer32...@gmail.com> wrote:
>>
>>> Sorry JaKob
>>>
>>> On Mon, May 21, 2018, 6:51 PM Abhishek Kanike <
>>> kai.dranzer32...@gmail.com> wrote:
>>>
 Cool.. I see it. Thanks a lot Jacob.

 On Mon, May 21, 2018, 5:40 PM Jakob Kummerow 
 wrote:

> The time always has to be retrieved from the kernel. V8's
> implementation is in base::OS::TimeCurrentMillis, implemented in
> src/base/platform/platform-{win32,posix}.cc.
>
> On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> Hi,
>> I want to know how the date.now() function is called in javascript
>> (or how it returns the value). I believe that javascript uses date.now() 
>> by
>> system call. I want to in chrome source code how it is being set.
>> This is useful for one of the performance benchmark that I am working
>> on.
>> Can someone please guide me to know how this happens in v8 engine.
>>
>> Thanks in advance.
>>
>> Regards,
>> K Abhishek
>>
>> --
>> --
>> v8-users mailing list
>> v8-users@googlegroups.com
>> http://groups.google.com/group/v8-users
>> ---
>> You received this message because you are subscribed to the Google
>> Groups "v8-users" group.
>> To unsubscribe from this group and stop receiving emails from it,
>> send an email to v8-users+unsubscr...@googlegroups.com.
>> For more options, visit https://groups.google.com/d/optout.
>>
> --
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>

>>
>> --
>> Cheers,
>> K Abhishek
>>
>> --
>> --
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>> http://groups.google.com/group/v8-users
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-- 
Cheers,
K Abhishek

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Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Jakob Kummerow]

Yes, it is.

Have you tried using a debugger? You can set a breakpoint in
the BUILTIN(DateNow) function here:

https://cs.chromium.org/chromium/src/v8/src/builtins/builtins-date.cc?q=builtins-date.cc=package:chromium=282

and step through the code from there.

On Mon, Jun 18, 2018 at 2:39 PM Abhishek Kanike 
wrote:

> ​Hi,
> For confirmation i am using a simple Date.now() call on button click
> [Attached].
> I have added a print log in Time::NOW() at
> https://cs.chromium.org/chromium/src/v8/src/base/platform/time.cc?type=cs=package:chromium=0=402
> as printf("v8:DEBUG::TIME:NOW called").
> I am not getting this log in adb logcat. So is this the correct place from
> where Date.now() is getting called?
>
> Regards,
> K Abhishek
>
> On Mon, May 21, 2018 at 6:51 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> Sorry JaKob
>>
>> On Mon, May 21, 2018, 6:51 PM Abhishek Kanike 
>> wrote:
>>
>>> Cool.. I see it. Thanks a lot Jacob.
>>>
>>> On Mon, May 21, 2018, 5:40 PM Jakob Kummerow 
>>> wrote:
>>>
 The time always has to be retrieved from the kernel. V8's
 implementation is in base::OS::TimeCurrentMillis, implemented in
 src/base/platform/platform-{win32,posix}.cc.

 On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike <
 kai.dranzer32...@gmail.com> wrote:

> Hi,
> I want to know how the date.now() function is called in javascript (or
> how it returns the value). I believe that javascript uses date.now() by
> system call. I want to in chrome source code how it is being set.
> This is useful for one of the performance benchmark that I am working
> on.
> Can someone please guide me to know how this happens in v8 engine.
>
> Thanks in advance.
>
> Regards,
> K Abhishek
>
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>>>
>
> --
> Cheers,
> K Abhishek
>
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Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Abhishek Kanike]

Sorry JaKob

On Mon, May 21, 2018, 6:51 PM Abhishek Kanike 
wrote:

> Cool.. I see it. Thanks a lot Jacob.
>
> On Mon, May 21, 2018, 5:40 PM Jakob Kummerow 
> wrote:
>
>> The time always has to be retrieved from the kernel. V8's implementation
>> is in base::OS::TimeCurrentMillis, implemented in
>> src/base/platform/platform-{win32,posix}.cc.
>>
>> On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike <
>> kai.dranzer32...@gmail.com> wrote:
>>
>>> Hi,
>>> I want to know how the date.now() function is called in javascript (or
>>> how it returns the value). I believe that javascript uses date.now() by
>>> system call. I want to in chrome source code how it is being set.
>>> This is useful for one of the performance benchmark that I am working on.
>>> Can someone please guide me to know how this happens in v8 engine.
>>>
>>> Thanks in advance.
>>>
>>> Regards,
>>> K Abhishek
>>>
>>> --
>>> --
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>>> v8-users@googlegroups.com
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>

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Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Abhishek Kanike]

Cool.. I see it. Thanks a lot Jacob.

On Mon, May 21, 2018, 5:40 PM Jakob Kummerow  wrote:

> The time always has to be retrieved from the kernel. V8's implementation
> is in base::OS::TimeCurrentMillis, implemented in
> src/base/platform/platform-{win32,posix}.cc.
>
> On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike <
> kai.dranzer32...@gmail.com> wrote:
>
>> Hi,
>> I want to know how the date.now() function is called in javascript (or
>> how it returns the value). I believe that javascript uses date.now() by
>> system call. I want to in chrome source code how it is being set.
>> This is useful for one of the performance benchmark that I am working on.
>> Can someone please guide me to know how this happens in v8 engine.
>>
>> Thanks in advance.
>>
>> Regards,
>> K Abhishek
>>
>> --
>> --
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>> http://groups.google.com/group/v8-users
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Re: [v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Jakob Kummerow]

The time always has to be retrieved from the kernel. V8's implementation is
in base::OS::TimeCurrentMillis, implemented in
src/base/platform/platform-{win32,posix}.cc.

On Mon, May 21, 2018 at 3:22 PM Abhishek Kanike 
wrote:

> Hi,
> I want to know how the date.now() function is called in javascript (or how
> it returns the value). I believe that javascript uses date.now() by system
> call. I want to in chrome source code how it is being set.
> This is useful for one of the performance benchmark that I am working on.
> Can someone please guide me to know how this happens in v8 engine.
>
> Thanks in advance.
>
> Regards,
> K Abhishek
>
> --
> --
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> v8-users@googlegroups.com
> http://groups.google.com/group/v8-users
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[v8-users] How Date.now() function value is returned (Is it from kernel of v8 engine has its own implementation)

[Abhishek Kanike]

Hi,
I want to know how the date.now() function is called in javascript (or how 
it returns the value). I believe that javascript uses date.now() by system 
call. I want to in chrome source code how it is being set. 
This is useful for one of the performance benchmark that I am working on.
Can someone please guide me to know how this happens in v8 engine.

Thanks in advance.

Regards,
K Abhishek

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