{
    "content": [
        {
            "type": "text",
            "text": "# IPC::Semaphore (perldoc)\n\n## NAME\n\nIPC::Semaphore - SysV Semaphore IPC object class\n\n## SYNOPSIS\n\nuse IPC::SysV qw(IPCPRIVATE SIRUSR SIWUSR IPCCREAT);\nuse IPC::Semaphore;\n$sem = IPC::Semaphore->new(IPCPRIVATE, 10, SIRUSR | SIWUSR | IPCCREAT);\n$sem->setall( (0) x 10);\n@sem = $sem->getall;\n$ncnt = $sem->getncnt;\n$zcnt = $sem->getzcnt;\n$ds = $sem->stat;\n$sem->remove;\n\n## DESCRIPTION\n\nA class providing an object based interface to SysV IPC semaphores.\n\n## Sections\n\n- **NAME**\n- **SYNOPSIS**\n- **DESCRIPTION**\n- **METHODS**\n- **SEE ALSO**\n- **AUTHORS**\n- **COPYRIGHT**\n\nUse structuredContent.sections for detailed options, examples, and full documentation.\n"
        }
    ],
    "structuredContent": {
        "command": "IPC::Semaphore",
        "section": "",
        "mode": "perldoc",
        "summary": "IPC::Semaphore - SysV Semaphore IPC object class",
        "synopsis": "use IPC::SysV qw(IPCPRIVATE SIRUSR SIWUSR IPCCREAT);\nuse IPC::Semaphore;\n$sem = IPC::Semaphore->new(IPCPRIVATE, 10, SIRUSR | SIWUSR | IPCCREAT);\n$sem->setall( (0) x 10);\n@sem = $sem->getall;\n$ncnt = $sem->getncnt;\n$zcnt = $sem->getzcnt;\n$ds = $sem->stat;\n$sem->remove;",
        "tldr_summary": null,
        "tldr_examples": [],
        "tldr_source": null,
        "flags": [],
        "examples": [],
        "see_also": [
            {
                "name": "semget",
                "section": "2",
                "url": "https://www.chedong.com/phpMan.php/man/semget/2/json"
            },
            {
                "name": "semctl",
                "section": "2",
                "url": "https://www.chedong.com/phpMan.php/man/semctl/2/json"
            },
            {
                "name": "semop",
                "section": "2",
                "url": "https://www.chedong.com/phpMan.php/man/semop/2/json"
            }
        ],
        "section_outline": [
            {
                "name": "NAME",
                "lines": 2,
                "subsections": []
            },
            {
                "name": "SYNOPSIS",
                "lines": 17,
                "subsections": []
            },
            {
                "name": "DESCRIPTION",
                "lines": 2,
                "subsections": []
            },
            {
                "name": "METHODS",
                "lines": 78,
                "subsections": []
            },
            {
                "name": "SEE ALSO",
                "lines": 2,
                "subsections": []
            },
            {
                "name": "AUTHORS",
                "lines": 2,
                "subsections": []
            },
            {
                "name": "COPYRIGHT",
                "lines": 7,
                "subsections": []
            }
        ],
        "sections": {
            "NAME": {
                "content": "IPC::Semaphore - SysV Semaphore IPC object class\n",
                "subsections": []
            },
            "SYNOPSIS": {
                "content": "use IPC::SysV qw(IPCPRIVATE SIRUSR SIWUSR IPCCREAT);\nuse IPC::Semaphore;\n\n$sem = IPC::Semaphore->new(IPCPRIVATE, 10, SIRUSR | SIWUSR | IPCCREAT);\n\n$sem->setall( (0) x 10);\n\n@sem = $sem->getall;\n\n$ncnt = $sem->getncnt;\n\n$zcnt = $sem->getzcnt;\n\n$ds = $sem->stat;\n\n$sem->remove;\n",
                "subsections": []
            },
            "DESCRIPTION": {
                "content": "A class providing an object based interface to SysV IPC semaphores.\n",
                "subsections": []
            },
            "METHODS": {
                "content": "new ( KEY , NSEMS , FLAGS )\nCreate a new semaphore set associated with \"KEY\". \"NSEMS\" is the number of semaphores in the\nset. A new set is created if\n\n*   \"KEY\" is equal to \"IPCPRIVATE\"\n\n*   \"KEY\" does not already have a semaphore identifier associated with it, and \"*FLAGS* &\nIPCCREAT\" is true.\n\nOn creation of a new semaphore set \"FLAGS\" is used to set the permissions. Be careful not to\nset any flags that the Sys V IPC implementation does not allow: in some systems setting\nexecute bits makes the operations fail.\n\ngetall\nReturns the values of the semaphore set as an array.\n\ngetncnt ( SEM )\nReturns the number of processes waiting for the semaphore \"SEM\" to become greater than its\ncurrent value\n\ngetpid ( SEM )\nReturns the process id of the last process that performed an operation on the semaphore\n\"SEM\".\n\ngetval ( SEM )\nReturns the current value of the semaphore \"SEM\".\n\ngetzcnt ( SEM )\nReturns the number of processes waiting for the semaphore \"SEM\" to become zero.\n\nid  Returns the system identifier for the semaphore set.\n\nop ( OPLIST )\n\"OPLIST\" is a list of operations to pass to \"semop\". \"OPLIST\" is a concatenation of smaller\nlists, each which has three values. The first is the semaphore number, the second is the\noperation and the last is a flags value. See semop(2) for more details. For example\n\n$sem->op(\n0, -1, IPCNOWAIT,\n1,  1, IPCNOWAIT\n);\n\nremove\nRemove and destroy the semaphore set from the system.\n\nset ( STAT )\nset ( NAME => VALUE [, NAME => VALUE ...] )\n\"set\" will set the following values of the \"stat\" structure associated with the semaphore\nset.\n\nuid\ngid\nmode (only the permission bits)\n\n\"set\" accepts either a stat object, as returned by the \"stat\" method, or a list of\n*name*-*value* pairs.\n\nsetall ( VALUES )\nSets all values in the semaphore set to those given on the \"VALUES\" list. \"VALUES\" must\ncontain the correct number of values.\n\nsetval ( N , VALUE )\nSet the \"N\"th value in the semaphore set to \"VALUE\"\n\nstat\nReturns an object of type \"IPC::Semaphore::stat\" which is a sub-class of \"Class::Struct\". It\nprovides the following fields. For a description of these fields see your system\ndocumentation.\n\nuid\ngid\ncuid\ncgid\nmode\nctime\notime\nnsems\n",
                "subsections": []
            },
            "SEE ALSO": {
                "content": "IPC::SysV, Class::Struct, semget(2), semctl(2), semop(2)\n",
                "subsections": []
            },
            "AUTHORS": {
                "content": "Graham Barr <gbarr@pobox.com>, Marcus Holland-Moritz <mhx@cpan.org>\n",
                "subsections": []
            },
            "COPYRIGHT": {
                "content": "Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz.\n\nVersion 1.x, Copyright (c) 1997, Graham Barr.\n\nThis program is free software; you can redistribute it and/or modify it under the same terms as\nPerl itself.\n",
                "subsections": []
            }
        }
    }
}