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file_pcntl.php
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file_pcntl.php
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<?php
/**
* @name file_pcntl.php
* @desc read file with pcntl
* @author MikeGuo([email protected])
*/
define("MAX_PROC_NUM", 10);
define("MAX_MEMORY_DEFAULT", 1024);
//ini_set("memory_limit", '10');
function read_file($proc_id, $path, $size, $mem) {
$fp = fopen($path, 'rb');
if (!$fp) {
echo "Error! Invalid file handler in Proc " . $proc_id . ".\n";
} else {
if (flock($fp, LOCK_SH)) {
fseek($fp, ($proc_id - 1) * $size);
$loop = 1;
while ($size > 0 && !feof($fp)) {
// roll back
$str_head = "";
if ($proc_id > 1 || $loop > 1) {
$char = null;
$off = 0;
fseek($fp, 1, SEEK_CUR);
do {
$off++;
fseek($fp, -2, SEEK_CUR);
$char = fread($fp, 1);
} while ($char != PHP_EOL && $off < $mem);
if ($off > 1) {
$str_head = fread($fp, $off - 1);
//echo "Proc $proc_id: rollback $off ---\n" . "$str_head\n" . "---\n";
}
}
// normal read
$str = fread($fp, min($size, $mem));
$len = strlen($str);
$size -= $len;
//echo "Proc $proc_id: normal $len ---\n" . "$str\n" . "---\n";
// cut tail
$off = 0;
while ($str[$len - 1 - $off] != PHP_EOL && $off < $len - 1) {
$off++;
}
$str_new = substr($str, 0, $len - 1 - $off);
//echo "Proc $proc_id: cut_tail $off ---\n" . "$str_new\n" . "---\n";
// final output
echo "Proc $proc_id: final ---\n" . "$str_head$str_new\n" . "---\n";
$loop++;
}
flock($fp, LOCK_UN);
}
}
fclose($fp);
}
function proc_manage($path, $num, $mem) {
$size = filesize($path);
$size = intval($size / $num) + 1;
for ($i = 1; $i <= $num; $i++) {
$pid = pcntl_fork();
if ($pid == -1) {
echo "Error! Fork Proc " . $i . " failed.\n";
} elseif ($pid > 0) {
//echo "Parent pid = " . posix_getpid() . ".\n";
//$pid_arr[] = $pid;
} else {
//echo "Child pid = " . posix_getpid() . ".\n";
read_file($i, $path, $size, $mem);
exit;
}
}
//var_dump($pid_arr);
// Wait for Child Proc complete
while (pcntl_waitpid(0, $status) != -1) {
//var_dump($status);
$status = pcntl_wexitstatus($status);
echo "Child Proc complete - status $status.\n";
}
}
function pow_of_2($num) {
while ($num > 1) {
if ($num % 2 == 1) return false;
$num = intval($num / 2);
}
if ($num == 1) return true;
else return false;
}
function parse_args($argc, $argv) {
if ($argc < 3 || $argc > 4) {
echo "Error! Wrong args number.\n";
echo "Usage: php file_pcntl.php file_path proc_num [max_mem]\n";
return;
}
$path = $argv[1];
$num = $argv[2];
$mem = MAX_MEMORY_DEFAULT;
if (!file_exists($path)) {
echo "Error! File doesn't exist.\n";
return;
}
if ($num < 1 || $num > MAX_PROC_NUM) {
echo "Error! Wrong proc number, supposed to be in 1 ~ " . MAX_PROC_NUM . ".\n";
return;
}
if ($argc == 4) {
if ($argv[3] > 0) $mem = $argv[3];
}
proc_manage($path, $num, $mem);
}
parse_args($argc, $argv);