Note that the default maximum script execution time is 30 seconds, but you can use sleep() and usleep() to make your scripts go on for longer than that because technically PHP does not have control during the sleep operation. The above script could be rewritten like this: The sleep () is another PHP inbuilt function that is utilized to postpone the execution of the ongoing content for a predefined number of seconds. Using either of them is far more accurate than the previous time() loop, and they both have their advantages - sleep() is better if you do not need the accuracy, and usleep() is better if you do. The difference between sleep() and usleep() is that sleep() takes a number of seconds as its parameter, whereas usleep() takes a number of microseconds - millionths of a second - as its parameter. A much better solution is to use the one of the two script sleep functions, sleep() and usleep(), which take the amount of time to pause execution as their only parameter. This might get your server to timeout, so check your configs and see if you can get some processing done outside of PHP, i.e. Secondly, PHP has to sit there looping thousands of times while it waits, essentially doing nothing. Why do you want to delay the loop Baba at 16:25 2 I should probably point out that a loop that runs 10 times with a 3 second delay will take 30 seconds to execute. Firstly, time() has a very low precision, only returning the number of whole seconds that have passed, which makes the whole thing quite vague. While it does work, there are two problems with it. Some people (thankfully very few) choose the first option and write code like this: When you want to pause execution in your script, there are two ways you can implement the code. done: pop rsi pop rdi ret return integer value parameter: rdi = string pointer return: rax = length strlen_simple: xor rax, rax. baddigit: mov rax, -1 return error code on failed conversion. baddigit sub rsi, 48 get ascii code for digit imul rax, 10 radix 10 add rax, rsi add current digit to total inc rdi jmp. convert: movzx rsi, byte test rsi, rsi check for null jz. done: xor rdi, rdi mov rax, 60 sys_exit syscall parameter: rdi = string pointer return: rax = integer conversion atoi_simple: push rdi push rsi xor rax, rax. done mov rdi, 0 any pid mov rsi, 0 mov rdx, 0 mov r10, 4 that has terminated mov rax, 247 sys_waitid syscall jmp. wait: dec r12 wait for each child process jz. done sub rsp, 16 stack space for timespec mov, rax seconds mov qword, 0 nanoseconds lea rdi, xor rsi, rsi mov rax, 35 sys_nanosleep syscall add rsp, 16 pop rdi retrieve item text call strlen_simple mov rsi, rdi mov byte, ' ' mov rdi, 1 mov rdx, rax inc rdx mov rax, 1 sys_write syscall jmp. This command sleep will delay the output by seconds specified in sleep command. getargv push rdi save pointer to sort item text call atoi_simple convert text to integer test rax, rax throw out bad input js. We can create a delay by using sleep command inside our PHP script. wait mov rdi, get argv inc r13 mov rax, 57 sys_fork syscall cmp rax, 0 continue loop in main process jnz. getargv: cmp r13, r12 check completion of args je. Sleep sort was presented anonymously on 4chan and has been discussed on Hacker News.įormat ELF64 executable 3 entry start parameters: argc, argv on stack start: mov r12, get argc mov r13, 1 skip argv. Enhancements for optimization, generalization, practicality, robustness, and so on are not required. If this is not idomatic in your language or environment, input and output may be done differently. Have it accept non-negative integers on the command line and print the integers in sorted order. Task: Write a program that implements sleep sort. Items are then collected sequentially in time. Note: This function throws an error if the specified number of. In general, sleep sort works by starting a separate task for each item to be sorted, where each task sleeps for an interval corresponding to the item's sort key, then emits the item. The sleep() function delays execution of the current script for a specified number of seconds. It may be applied to a set of data in order to sort it.įor comparing various sorts, see compare sorts.įor other sorting algorithms, see sorting algorithms, or:
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