Stack Overflow
Stack Overflow

Questions tagged [timeval]

56 questions
15
votes
2 answers

Is there a standard way to convert a struct timeval into a struct timespec?

struct timeval represents and instant in time with two members, tv_sec (seconds) and tv_usec (microseconds). In this representation, tv_usec is not by itself an absolute time it is a sub second offset off of tv_sec. struct timespec works the same…
dicroce
  • 45,396
  • 28
  • 101
  • 140
14
votes
4 answers

How do I compare two timestamps in C?

I'm writing a socket program that maintains FIFO queues for two input sockets. When deciding which queue to service, the program pulls the most recent time-stamp from each queue. I need a reliable method for comparing two timeval structs. I tried…
Vishal Kotcherlakota
  • 1,134
  • 4
  • 13
  • 36
12
votes
5 answers

Reinitialize timeval struct

How can I reinitialize a timeval struct from time.h? I recognize that I can reset both of the members of the struct to zero, but is there some other method I am overlooking?
BSchlinker
  • 3,401
  • 11
  • 51
  • 82
7
votes
2 answers

How to convert std::chrono::system_clock::duration into struct timeval

The title says it all. I have to implement a function that receives a std::chrono::system_clock::duration value and that needs to convert it into a timeval sruct so I can pass it to some system function.
chmike
  • 20,922
  • 21
  • 83
  • 106
4
votes
2 answers

Porting time APIs from Linux to Visual Studio 2008

I have an application that I am porting to Microsoft Visual Studio 2008 that builds and runs fine on Linux. I am having trouble with the time routines, my Linux code looks like this: #include #include typedef long long…
WilliamKF
  • 41,123
  • 68
  • 193
  • 295
4
votes
2 answers

C - timeval to uint64_t

Morning! I'm trying to get a nanosecond timestamp (uint64_t) from a timeval struct. struct timeval t; // initialized so that .... print("t sec: %ld, micro sec: %ld", t.tv_sec, t.tv_usec); // .... prints "t sec: 4, micro sec:…
Noel93
  • 135
  • 11
4
votes
2 answers

convert month/day/year/time to timeval in C/C++

In C/C++, suppose I have the following values: int year = 2010; int month = 6; int day = 15; int hour = 14; int minute = 52; int seconds = 34; int microseconds = 141231; What's the easiest way to convert this to a timeval? I think timeval is time…
user8125
  • 915
  • 2
  • 7
  • 6
4
votes
2 answers

Using struct timeval in Python

I have a C program containing a structure struct S{ int x; struct timeval t; }; and a function int func(struct S s1, struct S s2) I need to call this function from my python program. I am using ctypes.The parallel structure…
Sudip
  • 523
  • 2
  • 7
  • 14
3
votes
3 answers

Get time_t / timeval corresponding to ( local_timezone ) midnight on a given date

Given a time_t or struct timeval, how do I get the timeval or time_t of midnight EST/EDT ( local timezone ) on that day ? As in assuming local timezone is EST/EDT, given a time_t corresponding to say 2010-11-30 08:00:00 EST/EDT, the expected answer…
Humble Debugger
  • 4,439
  • 11
  • 39
  • 56
3
votes
3 answers

Is there a benefit in using unsigned long for timeval members?

I noticed some programmers use unsigned long for tv_sec and tv_usec [when they copy them or operate with them] of timeval while they are defined as simply long. Though it does make me wonder why they were defined like that when time usually goes…
j riv
  • 3,593
  • 6
  • 39
  • 54
3
votes
2 answers

c++ setting timeval members

I have a function which takes two current class level member variables and sets them into a timeval structure, and returns the timeval obj (by value). I am seeing an issue when setting a class level member timeval object vs creating a new timeval…
donalmg
  • 627
  • 5
  • 15
  • 22
3
votes
1 answer

How getrusage works and What is really inside the rusage struct?

I'm trying to understand how int getrusage(int who, struct rusage* usage) works in order to calculate the running time of one my program. I red the man page, 10 times maybe, and still can't get it. Tried to find something on the web, but nothing…
Root149
  • 389
  • 1
  • 3
  • 11
3
votes
1 answer

how to calculate milliseconds using timeval structure?

I want to retrieve values in milliseconds from a variable of type timeval. Below is my attempt: timeval* time; long int millis = (time->tv_sec * 1000) + (time->tv_usec / 1000); printf("Seconds : %ld, Millis : %ld", time->tv_sec, millis); Output =>…
sam18
  • 631
  • 1
  • 10
  • 24
2
votes
2 answers

timeval not returning expecting results

I have some code shown below: #include #include typedef struct{ struct timeval timestamp; }teststruct; class TestClass { public: TestClass(); void dosomething(int,…
wtabib
  • 19
  • 1
2
votes
1 answer

convert timeval structure to c#

I know this question may be so simple, I have the following code and it should be converted to C#, but the main problem is that I can not understand what below code is doing exactly!!!!...I've searched but I did not find any thing..I Think may be…
Paridokht
  • 1,374
  • 6
  • 20
  • 45
1
2 3 4