#39987 [Bgs->Opn]: loss of resources

ID: 39987 User updated by: wojtekm86 at konto dot pl Reported By: wojtekm86 at konto dot pl -Status: Bogus +Status: Open Bug Type: Semaphore related Operating System: Linux PHP Version: 5.2.0 New Comment: I'm changing the status to Open Previous Comments: ------------------------------------------------------------------------ [2006-12-31 08:24:09] wojtekm86 at konto dot pl I think you don't understand me. I know that sem_release doesn't remove the semaphore but I think it should because it's the one and only way to do it correct, of course if current process, which releases a semaphore, is the last one which acquired it. Please, read one more time bug's description. I think you didn't understand my intention. ------------------------------------------------------------------------ [2006-12-30 23:19:34] iliaa@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php if you want to remove the semaphore you need to call the sem_remove() function. Closing the semaphore won't remove it no more so then closing a file will remove it from disk. ------------------------------------------------------------------------ [2006-12-30 10:54:20] wojtekm86 at konto dot pl I think that there is also a problem with parameter max_acquire because value in column nsems always equals 3 ------------------------------------------------------------------------ [2006-12-29 17:45:15] wojtekm86 at konto dot pl Next code. I have a test script with code as follows: <?php $id = sem_get(10); sem_acquire($id); for($ind = 0; $ind < 10000; $ind++) { } sem_release($id); ?> I run it only once. The result I get after execute command ipcs -s on the server: ------ Semaphore Arrays -------- key semid owner perms nsems 0x0000000a 131075 www_php-a 666 3 It seems that there is a problem with semaphores' removal after release. ------------------------------------------------------------------------ [2006-12-29 17:33:32] wojtekm86 at konto dot pl I think it doesn't. In my script I have class Semaphore. There are methods like acquire() and release(). After each sem_acquire instruction I wrote: echo('I\'ve acquired semaphore key: ' . $this->key . '<br>'); After each sem_release instruction I wrote: echo('I\'ve released semaphore key: ' . $this->key . '<br>'); I have executed script only once. The result I saw is: I've acquired semaphore key: 1376159737 I've released semaphore key: 1376159737 I've acquired semaphore key: 1376159747 I've released semaphore key: 1376159747 I've acquired semaphore key: 1376159737 I've released semaphore key: 1376159737 I've acquired semaphore key: 1376159748 I've released semaphore key: 1376159748 I've acquired semaphore key: 1376159737 I've released semaphore key: 1376159737 I've acquired semaphore key: 1376159749 I've released semaphore key: 1376159749 As you can see each semaphore is released. But when I run command ipcs -s on my server I get: ------ Semaphore Arrays -------- key semid owner perms nsems 0x520687e6 131075 www_php-a 600 3 0x520687f9 163844 www_php-a 600 3 0x520687fa 196613 www_php-a 600 3 0x520687fc 229382 www_php-a 600 3 0x520687e9 262151 www_php-a 600 3 0x520687fd 294920 www_php-a 600 3 0x520687fe 327689 www_php-a 600 3 0x520687ff 360458 www_php-a 600 3 0x52068800 393227 www_php-a 600 3 0x52068801 425996 www_php-a 600 3 0x52068802 458765 www_php-a 600 3 0x52068803 491534 www_php-a 600 3 0x52068804 524303 www_php-a 600 3 0x52068805 557072 www_php-a 600 3 You can see that there are not removed semaphores. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/39987 -- Edit this bug report at http://bugs.php.net/?id=39987&edit=1