clock_t - Linux
Overview
clock_t
is a data type used to represent time measurements in Linux. It is implemented as a signed 32-bit or 64-bit integer, depending on the system architecture.
Syntax
#include <time.h>
Options/Flags
- None
Examples
- Measure elapsed time:
#include <time.h>
int main() {
clock_t start = clock();
// Perform some operation
clock_t end = clock();
double elapsed_time = (double)(end - start) / CLOCKS_PER_SEC;
printf("Elapsed time: %f seconds", elapsed_time);
return 0;
}
- Time certain code block:
#include <time.h>
#include <stdio.h>
int main() {
clock_t clock_start = clock();
int i = 0;
for (i = 0; i < 100000000; i++) {
continue;
}
clock_t clock_end = clock();
double time_spent = (double)(clock_end - clock_start) / CLOCKS_PER_SEC;
printf("Time spent: %f seconds", time_spent);
return 0;
}
Common Issues
- Ensure
CLOCKS_PER_SEC
is correctly defined on your system. - Avoid using
clock_t
directly for time comparisons, as it can overflow on long-running programs. Useclock_gettime()
instead.
Integration
- Combine with
clock_gettime()
for more precise time measurements. - Use with
sleep()
to pause execution for a specified duration.
Related Commands
time
: Execute a command while reporting time taken.date
: Display or set the system date and time.sleep
: Suspend execution for a specified period.