Orocos Real-Time Toolkit
2.8.3
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An object oriented wrapper around a counting semaphore. More...
#include <rtt/os/Semaphore.hpp>
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Semaphore (int count) | |
Initialize a Semaphore with an initial count. More... | |
~Semaphore () | |
Destroy a Semaphore. More... | |
void | wait () |
Lower this semaphore and return if value() is non zero. More... | |
void | signal () |
Raise this semaphore and signal one thread waiting on this semaphore. More... | |
bool | trywait () |
Try to wait on this semaphore. More... | |
int | value () |
Return the current count of this semaphore. More... | |
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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Initialize a Semaphore with an initial count.
Definition at line 70 of file Semaphore.hpp.
References rtos_sem_init().
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Raise this semaphore and signal one thread waiting on this semaphore.
Definition at line 96 of file Semaphore.hpp.
References rtos_sem_signal().
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Try to wait on this semaphore.
Definition at line 106 of file Semaphore.hpp.
References rtos_sem_trywait().
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Return the current count of this semaphore.
Definition at line 117 of file Semaphore.hpp.
References rtos_sem_value().
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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.
References rtos_sem_wait().