82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
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#ifndef FRAMEWORK_OSAL_LINUX_BINARYSEMPAHORE_H_
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#define FRAMEWORK_OSAL_LINUX_BINARYSEMPAHORE_H_
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#include <framework/returnvalues/HasReturnvaluesIF.h>
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#include <framework/tasks/SemaphoreIF.h>
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extern "C" {
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#include <semaphore.h>
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}
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/**
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* @brief OS Tool to achieve synchronization of between tasks or between
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* task and ISR. The default semaphore implementation creates a
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* binary semaphore, which can only be taken once.
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* @details
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* See: http://www.man7.org/linux/man-pages/man7/sem_overview.7.html
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* @author R. Mueller
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* @ingroup osal
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*/
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class BinarySemaphore: public SemaphoreIF,
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public HasReturnvaluesIF {
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public:
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static const uint8_t INTERFACE_ID = CLASS_ID::SEMAPHORE_IF;
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//! @brief Default ctor
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BinarySemaphore();
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//! @brief Copy ctor, deleted explicitely.
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BinarySemaphore(const BinarySemaphore&) = delete;
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//! @brief Copy assignment, deleted explicitely.
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BinarySemaphore& operator=(const BinarySemaphore&) = delete;
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//! @brief Move ctor
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BinarySemaphore (BinarySemaphore &&);
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//! @brief Move assignment
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BinarySemaphore & operator=(BinarySemaphore &&);
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//! @brief Destructor
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virtual ~BinarySemaphore();
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void initSemaphore(uint8_t initCount = 1);
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uint8_t getSemaphoreCounter() const override;
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static uint8_t getSemaphoreCounter(sem_t* handle);
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/**
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* Take the binary semaphore.
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* If the semaphore has already been taken, the task will be blocked
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* for a maximum of #timeoutMs or until the semaphore is given back,
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* for example by an ISR or another task.
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* @param timeoutMs
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* @return -@c RETURN_OK on success
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* -@c SemaphoreIF::SEMAPHORE_TIMEOUT on timeout
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*/
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ReturnValue_t acquire(uint32_t timeoutMs =
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SemaphoreIF::NO_TIMEOUT) override;
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/**
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* Release the binary semaphore.
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* @return -@c RETURN_OK on success
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* -@c SemaphoreIF::SEMAPHORE_NOT_OWNED if the semaphores is
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* already available.
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*/
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virtual ReturnValue_t release() override;
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/**
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* This static function can be used to release a semaphore by providing
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* its handle.
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* @param handle
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* @return
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*/
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static ReturnValue_t release(sem_t* handle);
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/** Checks the validity of the semaphore count against a specified
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* known maxCount
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* @param handle
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* @param maxCount
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* @return
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*/
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static ReturnValue_t checkCount(sem_t* handle, uint8_t maxCount);
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protected:
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sem_t handle;
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};
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#endif /* FRAMEWORK_OSAL_FREERTOS_BINARYSEMPAHORE_H_ */
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