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This article mainly explains the "Linux time delay and deferred operation method is what", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "Linux time delay and deferred operation method is what" it!

1. The header function for timing in the kernel is # include

2. The Hz symbol indicates the number of clock ticks produced per second, that is, the time interrupt generated by 1 second.

3 、 # include

Volatile unsigned long jiffies uses this variable to measure the change of time.

4. Int time_after (unsigned long a, unsigned long b)

Int time_before (unsigned long a, unsigned long b)

These Boolean expressions compare jiffies values in a safe way, regardless of timer overflow.

5. The numerical conversion between the time represented by jiffies and other representation methods:

Unsigned long timespec_to_jiffies (struct timespec * value); void jiffies_to_timespec (unsigned long jiffies, struct timespec * value); unsigned long timeval_to_jiffies (struct timeval * value); void jiffies_to_timeval (unsigned long jiffies, struct timeval * value), where timespec and timeval are clock time structures in linux systems: struct timeval {time_t tv_sec; / * seconds * / suseconds_t tv_usec; / * microseconds * /} Struct timespec {long int tv_sec; long int tv_nsec;}; header files using this structure in # include, the commonly used function is: int gettimeofday (struct timeval * tv, struct timezone * tz); so you can solve the time delay and delay operation problems under the Linux operating system. Thank you for your reading, the above is the content of "Linux time delay and deferred operation method". After the study of this article, I believe you have a deeper understanding of what the Linux time delay and deferred operation method is, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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