/usr/include/zthread/CountingSemaphore.h is in libzthread-dev 2.3.2-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 | /*
* Copyright (c) 2005, Eric Crahen
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is furnished
* to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef __ZTCOUNTINGSEMAPHORE_H__
#define __ZTCOUNTINGSEMAPHORE_H__
#include "zthread/Lockable.h"
#include "zthread/NonCopyable.h"
namespace ZThread {
class FifoSemaphoreImpl;
/**
* @class CountingSemaphore
* @author Eric Crahen <http://www.code-foo.com>
* @date <2003-07-16T15:26:18-0400>
* @version 2.2.1
*
* A CountingSemaphore is an owner-less Lockable object.
*
* It differs from a normal Semaphore in that there is no upper bound on the count
* and it will not throw an exception because a maximum value has been exceeded.
*
* @see Semaphore
*
* Threads blocked on a CountingSemaphore are resumed in FIFO order.
*/
class ZTHREAD_API CountingSemaphore : public Lockable, private NonCopyable {
FifoSemaphoreImpl* _impl;
public:
/**
* Create a new CountingSemaphore.
*
* @param count - initial count
*/
CountingSemaphore(int initialCount = 0);
//! Destroy the CountingSemaphore
virtual ~CountingSemaphore();
/**
* <i>Provided to reflect the traditional Semaphore semantics</i>
*
* @see acquire()
*/
void wait();
/**
* <i>Provided to reflect the traditional Semaphore semantics</i>
*
* @see tryAcquire(unsigned long timeout)
*/
bool tryWait(unsigned long timeout);
/**
* <i>Provided to reflect the traditional Semaphore semantics</i>
*
* @see release()
*/
void post();
/**
* Get the current count of the semaphore.
*
* This value may change immediately after this function returns to the calling thread.
*
* @return <em>int</em> count
*/
virtual int count();
/**
* Decrement the count, blocking that calling thread if the count becomes 0 or
* less than 0. The calling thread will remain blocked until the count is
* raised above 0, an exception is thrown or the given amount of time expires.
*
* @param timeout maximum amount of time (milliseconds) this method could block
*
* @return
* - <em>true</em> if the Semaphore was acquired before <i>timeout</i> milliseconds elapse.
* - <em>false</em> otherwise.
*
* @exception Interrupted_Exception thrown when the calling thread is interrupted.
* A thread may be interrupted at any time, prematurely ending any wait.
*
* @see Lockable::tryAcquire(unsigned long timeout)
*/
virtual bool tryAcquire(unsigned long timeout);
/**
* Decrement the count, blocking that calling thread if the count becomes 0 or
* less than 0. The calling thread will remain blocked until the count is
* raised above 0 or if an exception is thrown.
*
* @exception Interrupted_Exception thrown when the calling thread is interrupted.
* A thread may be interrupted at any time, prematurely ending any wait.
*
* @see Lockable::acquire()
*/
virtual void acquire();
/**
* Increment the count, unblocking one thread if count is positive.
*
* @see Lockable::release()
*/
virtual void release();
};
} // namespace ZThread
#endif // __ZTCOUNTINGSEMAPHORE_H__
|