#include <USemaphore.h>
A semaphore class.
On an acquire() call, the calling thread is blocked if the USemaphore's value is <= 0. It is unblocked when release() is called. The function acquire() decreases by 1 (default) the semaphore's value and release() increases it by 1 (default).
Example:
- See also
- UMutex
Definition at line 54 of file USemaphore.h.
| USemaphore::USemaphore |
( |
int |
initValue = 0 | ) |
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inline |
The constructor. The semaphore waits on acquire() when its value is <= 0.
- Parameters
-
Definition at line 61 of file USemaphore.h.
| virtual USemaphore::~USemaphore |
( |
| ) |
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inlinevirtual |
| bool USemaphore::acquire |
( |
int |
n = 1, |
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int |
ms = 0 |
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) |
| |
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inline |
Acquire the semaphore. If semaphore's value is <=0, the calling thread will wait until the count acquired is released.
- See also
- release()
- Parameters
-
| n | number to acquire |
| t | time to wait (ms), a value <=0 means infinite |
- Returns
- true on success, false on error/timeout
Definition at line 101 of file USemaphore.h.
| int USemaphore::acquireTry |
( |
int |
n | ) |
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inline |
| void USemaphore::operator= |
( |
const USemaphore & |
S | ) |
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inlineprivate |
| void USemaphore::release |
( |
int |
n = 1 | ) |
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inline |
Release the semaphore, increasing its value by 1 and signaling waiting threads (which called acquire()).
Definition at line 168 of file USemaphore.h.
| int USemaphore::value |
( |
| ) |
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inline |
Get the USempahore's value.
- Returns
- the semaphore's value
Definition at line 187 of file USemaphore.h.
| int USemaphore::_available |
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private |
| pthread_cond_t USemaphore::_cond |
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private |
| pthread_mutex_t USemaphore::_waitMutex |
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private |
The documentation for this class was generated from the following file: