#include <Semaphore.hpp>
Public Member Functions | |
Semaphore (int count) | |
void | signal () |
bool | trywait () |
int | value () |
void | wait () |
~Semaphore () | |
Private Attributes | |
rt_sem_t | sem |
An object oriented wrapper around a counting semaphore. It works like a traffic light on which a thread can wait() until the sempahore's value becomes positive, otherwise it blocks. Another thread then needs to signal() the semaphore. One thread which is waiting will then be awakened, if none is waiting, the first thread calling wait() will continue directly (and decrease the value by 1).
Definition at line 61 of file Semaphore.hpp.
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inline |
Initialize a Semaphore with an initial count.
Definition at line 70 of file Semaphore.hpp.
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inline |
Destroy a Semaphore.
Definition at line 78 of file Semaphore.hpp.
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inline |
Raise this semaphore and signal one thread waiting on this semaphore.
Definition at line 96 of file Semaphore.hpp.
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inline |
Try to wait on this semaphore
Definition at line 106 of file Semaphore.hpp.
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inline |
Return the current count of this semaphore.
Definition at line 117 of file Semaphore.hpp.
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inline |
Lower this semaphore and return if value() is non zero. Or wait if value() is zero until a signal occurs.
Definition at line 87 of file Semaphore.hpp.
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private |
Definition at line 64 of file Semaphore.hpp.