tv usec

# Include # Include # Include /* Accurate to USEC */ Void Getusertime (){ Static Struct Timeval tpstart, tpend; Static Float Timeuse; Static Int Count = 0 ; Count ++ ; If (Count % 2 ) = 1 ) Gettimeofday ( & Tpstart, null ); Else

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    1. # include Void do_gettimeofday (struct timeval * TV){Unsigned long flags;Unsigned long USEC, SEC;Read_lock_irqsave (&

PHP uniqid function Execution Slow problem Previous time a requirement: a customer submits a simple form to create a scratch card activity H5 page that adapts to the full terminal (Pc,pad,phone), which involves the ability of a customer to generate

Transferred from: http://blog.chinaunix.net/uid-20672257-id-2831219.htmlThe kernel generally obtains the current time through the jiffies value. Although this value represents the time interval since the last system boot to the current one, it is

Problem Introduction: After we re-installed a computer, we found that the Apache Log suddenly added a lot of requests with long service time, such as the following two: **--4913229 11227 [29/MAR/2012: 09: 59: 58 + 0800] "Get ********-4793564 9846 [29

Previous time a requirement: a customer submits a simple form to create a scratch card activity H5 page that adapts to the full terminal (Pc,pad,phone), which involves the ability of a customer to generate a quota 6W prize code online. Since it is

Introduction to non-blocking Synchronization How to correctly and effectively protect shared data is to write parallelProgramA major challenge is synchronization. Synchronization can be divided into Blocking-type synchronization (blocking

1. Linux time1.1 Linux Time System1.2. Time-related data structure in Linux 2. Obtain the current time 3. latency 4. Timer4.1. Alarm4.2. setitimer 1Linux time1.1 Linux Time SystemUNIX and Linux time systems start from epoch (the beginning of the

1. Time-related hardware The time in computer systems is mainly provided by three clock hardware: Real TimeClock, RTC), programmable interval timer, pit), timestampCounter, TSC ). These clock hardware provide clock square wave signal input based on