(Php 4, Php 5, Php 7, Php 8) GetMypid - Nhận ID quy trình của PHP — Gets PHP's process ID Sự mô tảgetMypid (): int | false(): int|false Thông sốChức năng này không có tham số. Trả về giá trị Trả về ID quy trình PHP hiện tại hoặc false khi lỗi.false on error. Ghi chúCảnh báo ID quy trình không phải là duy nhất, do đó chúng là một nguồn entropy yếu. Chúng tôi khuyên bạn nên chống dựa vào PID trong bối cảnh phụ thuộc bảo mật. Xem thêm- getMyGid () - Nhận GID của chủ sở hữu Php
- getMyuid () - Nhận uid của chủ tập bản Php
- GET_CURRENT_USER () - Nhận tên của chủ sở hữu tập lệnh PHP hiện tại
- getMyinode () - Nhận được inode của tập lệnh hiện tại
- getLastMod () - có thời gian sửa đổi trang cuối cùng
Radu Cristescu ¶ ¶ 9 năm trước
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.
For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.
The only filesystem operation that matches the above requirements that I know of is symlink().
Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).
#!/usr/bin/php
<?php
define
('LOCK_FILE', "/var/run/" . basename($argv[0], ".php") . ".lock");if (! tryLock())
die("Already running.\n");# remove the lock on exit (Control+C doesn't count as 'exit'?)
register_shutdown_function('unlink', LOCK_FILE);# The rest of your script goes here....
echo "Hello world!\n";
sleep(30);exit( 0);function
tryLock()
{
# If lock file exists, check if stale. If exists and is not stale, return TRUE
# Else, create lock file and return FALSE.if (@symlink("/proc/" . getmypid(), LOCK_FILE) !== FALSE) # the @ in front of 'symlink' is to suppress the NOTICE you get if the LOCK_FILE exists
return true;# link already exists
# check if it's stale
if (is_link(LOCK_FILE) && !is_dir(LOCK_FILE))
{
unlink(LOCK_FILE);
# try to lock again
return tryLock();
} return false;
}
?>
Robert Mays Jr ¶ 11 năm trước
All of the examples above require you to have shell command execution turned on- this example uses only PHP functions and should work on any system (posix is included by default)-
the key is posix_getsid which will return FALSE if the processes does not exist.
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.0
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.1
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.2
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.3 Brooke tại Jump Dot Net ¶ 18 năm trước
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.4
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.5
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.3
Kevin Traas (Ktraas- at -gmail dot com) ¶ ¶ 12 năm trước
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.7
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.8
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.9
For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.0
For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.1 Martijn tại Nowhere dot com ¶ ¶ 6 năm trước For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.2
Brospam tại Gmail Dot Com ¶ ¶ 9 năm trước For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.3
For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.4
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.3 Robert Mays Jr ¶ 12 năm trước
For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.6
For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.7
For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.8
For locks you need an atomic way of verifying if a lock file exists and creating it if it doesn't exist. Between file_exists and file_put_contents, another process could be faster than us to write the lock.9
The only filesystem operation that matches the above requirements that I know of is symlink().0 Martijn tại Nowhere dot com ¶ ¶ 6 năm trước The only filesystem operation that matches the above requirements that I know of is symlink().1
The only filesystem operation that matches the above requirements that I know of is symlink().2
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.3 Brospam tại Gmail Dot Com ¶ ¶ Erickson Reyes ercbluemonday tại yahoo dot com ¶ The only filesystem operation that matches the above requirements that I know of is symlink().4
The only filesystem operation that matches the above requirements that I know of is symlink().5
The only filesystem operation that matches the above requirements that I know of is symlink().6
The only filesystem operation that matches the above requirements that I know of is symlink().7
The only filesystem operation that matches the above requirements that I know of is symlink().8
The only filesystem operation that matches the above requirements that I know of is symlink().9
Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).0
Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).1
Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).2 Eight_hf tại Live Dot Fr ¶ ¶ 10 năm trước Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).3
kroczu tại interia dot pl ¶ Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).5
Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).6
Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).7
Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).8 16 năm trước ¶ 11 năm trước Thus, if you need a lock-file mechanism, here's the code. This won't work on a system without /proc (so there go Windows, BSD, OS X, and possibly others), but it can be adapted to work around that deficiency (say, by linking to your pid file like in my script, then operating through the symlink like in Kevin's solution).9
Brooke tại Jump Dot Net ¶ 12 năm trước #!/usr/bin/php
<?php0
#!/usr/bin/php
<?php1
#!/usr/bin/php
<?php2
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.3 Martijn tại Nowhere dot com ¶ ¶ 6 năm trước #!/usr/bin/php
<?php4
#!/usr/bin/php
<?php5
#!/usr/bin/php
<?php6
#!/usr/bin/php
<?php7
#!/usr/bin/php
<?php8
#!/usr/bin/php
<?php9
define0
Brospam tại Gmail Dot Com ¶ Erickson Reyes ercbluemonday tại yahoo dot com ¶ ¶ 12 năm trước define2
define3
The lock-file mechanism in Kevin Trass's note is incorrect because it is subject to race conditions.3
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